ProCurve / Cisco Interoperability Guide

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1 ProCurve Networking ProCurve / Cisco Interoperability Guide Introduction... 3 Discovery protocols: LLDP & CDP... 4 VLAN configuration... 7 Introduction... 7 VLAN configuration on Cisco Catalyst... 8 VLAN configuration on HP ProCurve...10 Checking VLANs status and connectivity...11 Additional info about VLANs...14 Link aggregation...19 Introduction...19 A Static Trunk/Channel...21 LACP Trunk/Channel...24 Spanning-Tree...29 Introduction...29 MSTP Configuration...31 Cisco as Core running PVST+, HP ProCurve as Edge running RSTP...41 HP ProCurve as Core running RSTP, Cisco as Edge running PVST IP routing Interoperability...55 Sample topology...55 RIP configuration...55 Other RIP features...58

2 OSPF Single Area...60 Redistribution into OSPF...64 Configuration of Multiple OSPF areas...70 Other OSPF features...77 IP Multicast interoperability...80 Introduction...80 PIM DENSE Mode...80 PIM SPARSE Mode...86

3 Introduction Today s multi-vendor environments present many challenges to administrators trying to configure dissimilar (proprietary vs. standard) protocols. In an effort to accommodate the needs for many of our partners and customers, ProCurve networking has written this guide to assist in the configuration and deployment of ProCurve and Cisco environments. The intent of this document isn t to describe why you should do these things, nor does it argue what the benefits are. It merely goes through how to accomplish the necessary configurations to get the Cisco and ProCurve switches configured so that they will work together. While the testing conducted was extensive, it is impossible that all possible configurations and scenarios were captured. This document therefore, can not be assumed to be perfect as it applies to every environment. Please consider carefully the implications of some of these changes before instituting them. The recommendation is to test the new configurations in a controlled environment prior to rolling out changes that could impact your production environment. Additionally, saving current configuration files for switches is a good practice for backup. Thank you

4 Discovery protocols: LLDP & CDP ProCurve is committed to standards. And it is logically that the proprietary discovery protocol CDP (Cisco Discovery protocol) has been replaced by the IEEE 802.1AB standard LLDP (Link Layer Discovery protocol) when this one was released. If LLDP is enabled by default, CDP remains in Read-only mode (receive-only). Then ProCurve switches can discover LLDP neighbors as well as Cisco device neighbors. Note: Cisco does not support yet LLDP in its equipments. Cisco IP Phone could in a close future supports LLDP-MED (Media End-Point Discovery) which will then allow automatic discovery and configuration of IP Phones. Some IP Phone vendors such as Avaya and Mitel are already committed to LLDP-MED. The network scheme used here is the same as in the MSTP example. Gi1/1 e 1 Procurve-Edge-1 e 2 Gi1/1 Gi1/3 Gi1/2 Gi1/3 Gi1/2 Cisco-Core-1 Cisco-Core-2 e 1 e 2 Procurve-Edge-2 Discovery configuration We simply use the default configuration regarding Discovery protocols. On ProCurve switches: LLDP is enabled in send and receive mode. CDP is enabled in received mode. On Cisco: CDP is enabled by default.

5 Checking Discovery info on a ProCurve switch The following command lists CDP neighbors. As expected, it displays the two Catalyst ProCurve-Edge-1# show cdp neighbors CDP neighbors information Port Device ID Platform Capability Core-Cisco-1 Cisco IOS Software, C R S 2 Core-Cisco-2 Cisco IOS Software, C R S LLDP neighbors: the ProCurve switch displays the two Catalyst 6500 as well because the LLDP display includes the CDP neighbors. ProCurve-Edge-1# show lldp info remote-device LLDP Remote Devices Information LocalPort ChassisId PortId PortDescr SysName Core-Cisco-1 Gig... 2 Core-Cisco-2 Gig... We display the LLDP neighbors attached to given ports. It shows details about neighbors. ProCurve-Edge-1# show lldp info remote-device 1-2 LLDP Remote Device Information Detail Local Port : 1 ChassisType : local ChassisId : Core-Cisco-1 PortType : local PortId : GigabitEthernet0/1 SysName : System Descr : Cisco IOS Software, C6500 Software (C6500-IPSERVICESK9- M)... PortDescr : System Capabilities Supported : bridge, router System Capabilities Enabled : bridge, router Remote Management Address Type : ipv4 Address : Local Port : 2 ChassisType : local ChassisId : Core-Cisco-2 PortType : local PortId : GigabitEthernet0/1 SysName : System Descr : Cisco IOS Software, C6500 Software (C6500-IPSERVICESK9- M)... PortDescr : System Capabilities Supported : bridge, router System Capabilities Enabled : bridge, router

6 Remote Management Address Type : ipv4 Address : Checking Discovery info on a Cisco switch As ProCurve switches do not send anymore CDP frames, a Cisco switch will not recognize ProCurve neighbors. Let s hope for a Cisco commitment to the IEEE LLDP standard. Core-Cisco-1#show cdp neighbors Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone Device ID Local Intrfce Holdtme Capability Platform Port ID Core-Cisco-2 Gig 0/3 171 R S I WS-C Gig0/3

7 VLAN configuration 11- Introduction 12- VLAN Configuration on Cisco Catalyst 13- VLAN configuration on HP ProCurve 14- Checking VLANs status and connectivity 15- Additional info about VLANs a. Native VLAN b. Configuring a management VLAN other than VLAN 1 c. Changing maximum number of VLANs d. Configuring ports for IP Phones e. VTP GVRP f. Cisco Extended Range of VLANs Introduction Glossary This chapter deals with port based VLANs that Cisco and HP ProCurve both support. Different names are used to describe similar concepts on both platforms. Cisco HP ProCurve What is it? Trunk Tagged A port that carries multiple VLANs using the 802.1q tag, for example an uplink, an IP phone port. Access Untagged A port that belongs to a unique VLAN and is untagged Native VLAN - Defines the untagged VLAN of a 802.1q - tagged port. Defaults to VLAN 1 on HP and Cisco

8 Sample topology Edge/Access ports untagged in VLANs 10,20, 30 & 40 Vlan 40 Vlan 30 Vlan 20 Vlan /24 Vlan / / / /24 Cisco-1 Uplink 802.1q port tagged in VLANs 10,20, 30 & 40 and untagged in vlan 1 Procurve-1 Vlan 40 Vlan 30 Vlan 20 Vlan / /24 Vlan / / /24 VLAN configuration on Cisco Catalyst Step 1: VLAN Creation Conf t vlan 10, 20, 30, 40 Step 2: Assignment of Access ports to VLANs interface range FastEthernet1/0/10-19 switchport access vlan 10 switchport mode access interface range FastEthernet1/0/20-29 switchport access vlan 20 switchport mode access interface range FastEthernet1/0/30-39 switchport access vlan 30 switchport mode access interface range FastEthernet1/0/40-48 switchport access vlan 40 switchport mode access

9 Step 3: Creation of 802.1q links (Cisco Trunk ) interface FastEthernet1/0/1 The encapsulation method defines how multiple VLANs are carried on Cisco Ethernet links. Cisco supports a proprietary method, ISL, and the IEEE standard 802.1q (noted dot1q ). switchport trunk encapsulation dot1q By default, a Cisco trunk carries all VLANs. The allowed VLAN restricts transport of VLANs to the specified VLANs. switchport trunk allowed vlan 1,10,20,30,40 By default, a port is in access mode, i.e. it belongs to one VLAN only. switchport mode trunk Cisco also supports a proprietary negotiation protocol for the trunk named DTP (Dynamic Trunk Protocol). When defined in trunk mode the port generates DTP frames. The following command disables generation of DTP frames. This is the recommended configuration when connected to ProCurve switches. switchport nonegotiate Step 4: IP configuration If the switch is a layer 2 switch, a unique IP address is usually defined in one VLAN for management purpose only and a default gateway is configured for access from remote subnets. interface vlan1 ip address no shutdown ip default-gateway In this sample, for testing connectivity, one IP address has been defined in each VLAN. interface vlan10 ip address no shutdown interface vlan20 ip address no shutdown interface vlan30 ip address no shutdown interface vlan40 ip address no shutdown

10 VLAN configuration on HP ProCurve Step1: VLAN creation and port assignment VLAN creation Conf Ports 1 to 9 are assigned to VLAN 10 and removed from VLAN 1 (default VLAN). Port 45 (uplink) is tagged in VLAN 10 while remaining untagged member of VLAN 1. vlan 10 name Test10 untagged 1-9 tagged 45 Exit Ports 10 to 19 are assigned to VLAN 20. Port 45 (uplink) is tagged in VLAN 20. vlan 20 untagged tagged 45 vlan 30 untagged tagged 45 vlan 40 untagged tagged 45 Step2: IP address One or more IP address per VLAN can be configured. Usually on a L2 switch, one ip address in a VLAN and a default-gateway is defined. In this example, multiple IP addresses have been defined for testing connectivity. vlan 1 ip address vlan 10 ip address vlan 20 ip address vlan 30 ip address

11 vlan 40 ip address Checking VLANs status and connectivity Checking VLANs on Cisco Checking ports assignment to VLANs The following display shows the access ports and does not include the Cisco trunk (802.1q links) ports. Cisco-1#show vlan vlan Name Status Ports default active Fa1/0/2, Fa1/0/3, Fa1/0/4 Fa1/0/5, Fa1/0/6, Fa1/0/7 Fa1/0/8, Fa1/0/9, Fa1/0/19 Fa1/0/45, Fa1/0/46, Fa1/0/47 Fa1/0/48, Gi1/0/1, Gi1/0/2 Gi1/0/3, Gi1/0/4 10 vlan0010 active Fa1/0/10, Fa1/0/11, Fa1/0/12 Fa1/0/13, Fa1/0/14, Fa1/0/15 Fa1/0/16, Fa1/0/17, Fa1/0/18 20 vlan0020 active Fa1/0/20, Fa1/0/21, Fa1/0/22 Fa1/0/23, Fa1/0/24, Fa1/0/25 Fa1/0/26, Fa1/0/27, Fa1/0/28 Fa1/0/29 30 vlan0030 active Fa1/0/30, Fa1/0/31, Fa1/0/32 Fa1/0/33, Fa1/0/34, Fa1/0/35 Fa1/0/36, Fa1/0/37, Fa1/0/38 Fa1/0/39 40 vlan0040 active Fa1/0/40, Fa1/0/41, Fa1/0/42 Fa1/0/43, Fa1/0/ fddi-default act/unsup 1003 token-ring-default act/unsup 1004 fddinet-default act/unsup 1005 trnet-default act/unsup (skip ) Checking a Cisco Trunk (802.1q) port status Note the operational mode, the encapsulation mode dot1q (802.1q), the Native VLAN (the untagged VLAN on the 802.1q link) and the allowed VLANs on port. Cisco-1#show int fa1/0/1 switchport Name: Fa1/0/1 Switchport: Enabled Administrative Mode: trunk Operational Mode: trunk Administrative Trunking Encapsulation: dot1q Operational Trunking Encapsulation: dot1q Negotiation of Trunking: Off Access Mode vlan: 1 (default) Trunking Native Mode vlan: 1 (default) Administrative Native vlan tagging: enabled

12 (skip) Trunking vlans Enabled: 1,10,20,30,40 Pruning vlans Enabled: Capture Mode Disabled Capture vlans Allowed: ALL (skip) Checking access port status Cisco-1#sh int fa1/0/10 switchport Name: Fa1/0/10 Switchport: Enabled Administrative Mode: static access Operational Mode: up Administrative Trunking Encapsulation: negotiate Negotiation of Trunking: Off Access Mode vlan: 10 (vlan0010) Trunking Native Mode vlan: 1 (default) Administrative Native vlan tagging: enabled (skip) Testing connectivity The connectivity is tested in the various VLANs defined on the 802.1q link Cisco-1#ping Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to , timeout is 2 seconds:!!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/8 ms Cisco-1#ping Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to , timeout is 2 seconds:!!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/9 ms Cisco-1#ping Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to , timeout is 2 seconds:!!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/1 ms Cisco-1#ping Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to , timeout is 2 seconds:!!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/1 ms Cisco-1#ping Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to , timeout is 2 seconds:!!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/8 ms

13 Checking VLANs on HP ProCurve The following is a list of defined VLANs. Procurve-1(config)# show vlan Status and Counters - vlan Information Maximum vlans to support : 8 Primary vlan : DEFAULT_vlan Management vlan : 802.1Q vlan ID Name Status Voice Jumbo DEFAULT_vlan Port-based No No 10 TEST10 Port-based No No 20 vlan20 Port-based No No 30 vlan30 Port-based No No 40 vlan40 Port-based No No *Note that the maximum number of VLANs can be increased. List of ports defined in a given VLAN Procurve-1(config)# show vlan 10 Status and Counters - vlan Information - Ports - vlan Q vlan ID : 10 Name : Test10 Status : Port-based Voice : No Jumbo : No Port Information Mode Unknown vlan Status Untagged Learn Down 2 Untagged Learn Down 3 Untagged Learn Down 4 Untagged Learn Down 5 Untagged Learn Down 6 Untagged Learn Down 7 Untagged Learn Down 8 Untagged Learn Down 9 Untagged Learn Down 45 Tagged Learn Up 46 Tagged Learn Down 47 Tagged Learn Down 48 Tagged Learn Down List of VLANs defined for a given port. Although it is not explicitly shown in this display, port 45 is tagged in VLAN 10, 20, 30 and 40 and untagged in 1.

14 Procurve-1(config)# show vlan port 45 Status and Counters - vlan Information - for ports Q vlan ID Name Status Voice Jumbo DEFAULT_vlan Port-based No No 10 TEST10 Port-based No No 20 vlan20 Port-based No No 30 vlan30 Port-based No No 40 vlan40 Port-based No No Port 10 as an access port is untagged and belongs to VLAN 20 only Procurve-1(config)# show vlan port 10 Status and Counters - vlan Information - for ports Q vlan ID Name Status Voice Jumbo vlan20 Port-based No No Checking IP interfaces Procurve-1(config)# sh ip Internet (IP) Service IP Routing : Disabled Default-gateway : Default TTL : 64 Arp Age : 20 vlan IP Config IP Address Subnet Mask Proxy ARP DEFAULT_vlan Manual No TEST10 Manual No vlan20 Manual No vlan30 Manual No vlan40 Manual No Additional info about VLANs The Native VLAN The concept of native VLAN on Cisco defines the untagged VLAN on a tagged link. It is VLAN 1 by default. It can be changed with the following commands: interface FastEthernet1/0/1 switchport trunk native vlan 99

15 Which native VLAN is defined on a port can be checked with: Show interface Fa1/0/1 switchport On HP ProCurve, when a port is tagged for any number of VLANs, it remains untagged in VLAN 1 by default. To make VLAN 99 the untagged (native) VLAN of a tagged port, enter the following commands: vlan 99 Untagged 45 Then check that Port 45 is untagged in VLAN 99 with: Show vlan 99 Usually the Native VLAN is used to manage switches. Tip : What is the benefit of configuring the Native Vlan with an IP address? A switch, with its default configuration, have all ports untagged. If connected to a tagged port, this switch will still be able to send and receive frames through the untagged (native) VLAN. It will then be able to receive an IP address automatically via DHCP. This IP address can be discovered by LLDP (show lldp info remote) or found at the DHCP server. The switch can then be managed and configured remotely via Telnet. Configuring a management VLAN other than VLAN 1 It is very common to use VLAN 1 as the management VLAN. But any created VLAN can be used to manage switches. As explained in the previous paragraph, it is common to use the Native/Untagged VLAN to be the management VLAN. Again this is not mandatory and one can choose the VLAN to be carried as tagged on uplinks. Choosing a VLAN other than VLAN 1 for management, we make a clear distinction between Default VLAN and Management VLAN. In the following example, VLAN 99 is used as the management VLAN and defined as untagged on 802.1q uplinks. ProCurve configuration of a management VLAN vlan 99 Untagged 45 Ip address /24 Ip default-gateway vlan 10 Tagged 45 vlan 20 Tagged 45

16 vlan 30 Tagged 45 vlan 40 Tagged 45 Exit Checking VLAN Procurve-1# show vlan 99 Status and Counters - vlan Information - Ports - vlan Q vlan ID : 99 Name : vlan99 Status : Port-based Voice : No Jumbo : No Port Information Mode Unknown vlan Status Untagged Learn Up Procurve-1# show vlan port 45 Status and Counters - vlan Information - for ports Q vlan ID Name Status Voice Jumbo TEST10 Port-based No No 20 vlan20 Port-based No No 30 vlan30 Port-based No No 40 vlan40 Port-based No No 99 vlan99 Port-based No No Configuration of a management VLAN on Cisco interface FastEthernet1/0/1 switchport trunk encapsulation dot1q switchport trunk native vlan 99 switchport trunk allowed vlan 1,10,20,30,40,99 switchport mode trunk int vlan 99 ip address no shutdown Checking VLAN Cisco-1#sh vlan 99 vlan Name Status Ports vlan0099 active Checking Cisco trunk port status

17 Cisco-1#sh int fa 1/0/1 switchport Name: Fa1/0/1 Switchport: Enabled Administrative Mode: trunk Operational Mode: trunk Administrative Trunking Encapsulation: dot1q Operational Trunking Encapsulation: dot1q Negotiation of Trunking: On Access Mode vlan: 1 (default) Trunking Native Mode vlan: 99 (vlan0099) Administrative Native vlan tagging: enabled Voice vlan: none (skip) Trunking vlans Enabled: 1,10,20,30,40,99 Pruning vlans Enabled: (skip) Checking connectivity Cisco-1#ping Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to , timeout is 2 seconds:!!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/9 ms Note that HP ProCurve also defines a security concept called Management VLAN. When enabled, it becomes the only VLAN through which the switch can be configured. It is disabled by default. (see Advanced Traffic Management Guide, Jan ) to configure. Changing the maximum number of VLANs on ProCurve On ProCurve, the maximum number of VLANs can be increased by entering: Conf Max-vlans 48 Write memory reload Configuration of ports for IP Phones To support both an IP Phone and a PC, a port is configured with one tagged VLAN (for example 200) to carry voice and one untagged VLAN (for example 10) to transport the data On ProCurve: vlan 10 name DATA10 Untagged B1-B12 vlan 200 name IPVOICE Tagged B1-B12

18 On Cisco: Interface range fa1/0/1-12 switchport trunk encapsulation dot1q switchport trunk allowed vlan 10,200 switchport mode trunk switchport trunk native vlan 10 switchport nonegotiate VTP GVRP Cisco supports the proprietary protocol VTP (VLAN Trunking Protocol) that allows propagation of created, deleted or modified VLANs through multiple Cisco switches. ProCurve switches do not support it. On the other hand, HP supports the IEEE GVRP standard (GARP VLAN Registration Protocol) which combines automatic creation of VLANs and automatic tagging of uplinks. GVRP is supported on some Cisco switches running the CatOS software and interacts properly with ProCurve switches. But it s that GVRP support as been removed in the IOS for Catalyst switches Cisco Extended Range of VLANs Previously to 802.1q mode, Cisco trunk ports supported the proprietary ISL mode to carry multiple VLANs on a port. The VLAN-id in ISL is based on 10 Bits and then supports VLANs ranging from 1 to With 802.1q support, VLAN Id is on 12 bits and Cisco has defined an extended range to support VLANs from 1024 to To create a VLAN in the extended range, vtp must be defined in transparent mode with the following global config mode command: Vtp mode transparent

19 Link aggregation 21- Introduction 22- Static Link Aggregation 23- LACP Link Aggregation HP Active and Cisco passive Cisco Active and HP passive HP static LACP and Cisco passive Introduction Glossary Cisco HP ProCurve What is it? Channel-group Trunk Description of an aggregated link Port-channel Trunk port The logical port representing an aggregated link Int channel 1 Int trk1 To enter the configuration mode of an aggregated link interface FEC is the Fast EtherChannel concept. It implements the Port Aggregation Protocol (PAgP) that allows two equipments to negotiate a link aggregation. FEC is supported on most of the Cisco switches and routers. It used to be supported in the oldest version of firmware of ProCurve. Note: In the most recent versions of Firmware, support for FEC has been removed. LACP is the Link Aggregation Control Protocol defined by the 802.3ad standard. Similarly to FEC, it provides a way for both parts to negotiate a port aggregation. With LACP, one or more additional links can operate as «standby» links that will activate only if another active link goes down Static and Dynamic trunks/channels A Static trunks becomes an active trunk unconditionally and independently of the configuration of the other side. A static trunk does not need any protocol to be created. Dynamic trunks will be created if both sides agree to it. To do so, they exchange messages, either PAgP or LACP, to negotiate their status. One side is said active (LACP) or desirable (PAgP), meaning that it initiates the

20 negotiation. The other side is said passive (LACP) or auto (PAgP) and forms a link aggregation automatically. Static and Dynamic On most HP ProCurve devices 1, static trunks can also be defined as LACP. In that case, they become active unconditionally AND generate LACP frames to allow the remote side to form a trunk automatically. When to use a static or a dynamic trunk/channel? Static trunks always work and can be used to create link aggregation with switches of many brands and with servers equipped with the right NIC and driver. Because of its simplicity, it is the preferred method. When one manages a large number of trunks and doesn t know in advance what will be connected to the ports of a switch, dynamic trunks can reduce the configuration burden. If the remote side supports LACP in passive mode (default on Cisco and HP), one side only has to be configured in active mode for the trunk to be formed automatically. What works together? When connecting a Cisco and a HP ProCurve switch, some options work together and some don t. This table summarizes what options can be combined with each other to create a trunk on both sides. HP / Cisco mode On (no protocol) FEC Desirable FEC Auto LACP Active Static (no protocol) Y N N N N Static FEC(*) Y Y Y N N Static LACP Y N N Y Y LACP Active N N N Y Y LACP Passive N N N Y N LACP Passive Legend N=No, one side at least will not create a trunk; Y=yes trunk is created on both sides, Y= yes and preferred setup. (*): requires older version of firmware of ProCurve switches Ports in the link aggregation group Ports in the channel or trunk group must share same characteristics: speed, duplex, vlan assignment. The media type, such as 1000BT or 1000SX, can be mixed on HP ProCurve. The same holds true for Cisco. 1 Refer to ProCurve switch owner s manual to determine if FEC is supported on a particular model.

21 Logical port defined by the Link aggregation On Cisco it is named port-channel and is configured as the Interface Portchannel x. On HP ProCurve it is name trunk port and is configured as the interface Trk# for a static trunk or interface Dyn# for a dynamic trunk. On HP ProCurve, when a trunk is formed, it is assigned to the default-vlan. A Static Trunk/Channel Sample Topology Cisco Channel Fa1/0/1-4 Trunk Procurve In this example, trunk/channel group is configured as a L2 port assigned to Vlan 10. Static Trunk on HP ProCurve Configuration conf trunk Trk1 Trunk Trk1 is a logical port and can be assigned to a Vlan as any other physical port. An IP address is assigned to Vlan 10 to test connectivity vlan 10 untagged Trk1 ip address

22 Checking trunk status To verify what ports are members of a trunk: ProCurve# show trunk Load Balancing Port Name Type Group Type /1000T Trk1 Trunk /1000T Trk1 Trunk /1000T Trk1 Trunk /1000T Trk1 Trunk What vlans does trunk Trk1 belongs to? ProCurve# show vlan port trk1 Status and Counters - VLAN Information - for ports Trk Q VLAN ID Name Status Voice Jumbo VLAN10 Port-based No No To check connectivity with neighbor: ProCurve# ping is alive, time = 1 ms Static port-channel on Cisco Configuration conf t interface range FastEthernet1/0/1 4 Interfaces are configured as L2 interface in Vlan 10 switchport mode access switchport access vlan 10 Interfaces are put in the same channel group. On mode means static. channel-group 1 mode? active Enable LACP unconditionally auto Enable PAgP only if a PAgP device is detected desirable Enable PAgP unconditionally on Enable Etherchannel only passive Enable LACP only if a LACP device is detected channel-group 1 mode on An IP address is assigned to Vlan 10 to test connectivity. interface Vlan 10 ip address no shutdown end

23 Checking Channel status Cisco1#show etherchannel 1 summary Flags: D - down P - in port-channel I - stand-alone s - suspended H - Hot-standby (LACP only) R - Layer3 S - Layer2 U - in use f - failed to allocate aggregator u - unsuitable for bundling w - waiting to be aggregated d - default port Number of channel-groups in use: 1 Number of aggregators: 1 Group Port-channel Protocol Ports Po1(RU) PAgP Fa1/0/1(P) Fa1/0/2(P) Fa1/0/3(P) Fa1/0/4(P) Cisco#show int etherchannel 1 detail ---- FastEthernet1/0/1: Port state = Up Mstr In-Bndl Channel group = 1 Mode = On/FEC Gcchange = - Port-channel = Po1 GC = - Pseudo port-channel = Po1 Port index = 0 Load = 0x00 Protocol = - Age of the port in the current state: 00d:00h:02m:11s (skip) Info is repeated for all ports that are members of the channel

24 LACP Trunk/Channel With LACP, one side must be active (send LACP frames) and the other passive. Dynamic channel/trunk: Cisco active HP passive Cisco LACP Active configuration Cisco switch is defined as the active side conf t int range fa1/0/1-4 channel-group 1 mode active Check channel status Cisco#sh int etherchannel ---- FastEthernet1/0/1: Port state = Up Mstr In-Bndl Channel group = 1 Mode = Active Gcchange = - Port-channel = Po1 GC = - Pseudo port-channel = Po1 Port index = 0 Load = 0x00 Protocol = LACP Flags: S - Device is sending Slow LACPDUs F - Device is sending fast LACPDUs. A - Device is in active mode. P - Device is in passive mode. Local information: LACP port Admin Oper Port Port Port Flags State Priority Key Key Number State Fa1/0/1 SA bndl x1 0x1 0x3 0x3D Partner's information: LACP port Oper Port Port Port Flags Priority Dev ID Age Key Number State Fa1/0/1 SP a50.0d80 8s 0x0 0x2D 0x3C Age of the port in the current state: 00d:00h:00m:06s (skip info..) Port-channel1:Port-channel1 (Primary aggregator) Age of the Port-channel = 00d:00h:06m:15s Logical slot/port = 10/1 Number of ports = 4 HotStandBy port = null Port state = Port-channel Ag-Inuse Protocol = LACP Ports in the Port-channel: Index Load Port EC state No of bits Fa1/0/1 Active Fa1/0/2 Active Fa1/0/3 Active Fa1/0/4 Active 0

25 Time since last port bundled: 00d:00h:00m:09s Fa1/0/4 Time since last port Un-bundled: 00d:00h:02m:54s Fa1/0/4 Test connectivity Cisco#ping Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to , timeout is 2 seconds:..!!! Success rate is 60 percent (3/5), round-trip min/avg/max = 1/1/1 ms Configuration of HP ProCurve LACP Trunk ( passive ) By default on ProCurve, ports are defined as LACP Passive. So no configuration is needed. Check trunk formation: ProCurve# show trunk Load Balancing Port Name Type Group Type /1000T Dyn1 LACP /1000T Dyn1 LACP /1000T Dyn1 LACP /1000T Dyn1 LACP Note: the trunk group defined on ProCurve is a Dynamic trunk Dyn1 and belongs to Vlan1. It cannot be assigned to any other vlans except via GVRP. To allocate trunk port to Vlans, one should prefer the static trunk, with or without LACP or FEC protocols. Dynamic LACP trunk/channel: HP Active - Cisco Passive Cisco switch is defined in LACP Passive mode Conf t interface range FastEthernet1/0/1-4 switchport mode access channel-group 1 mode passive HP ProCurve is the LACP Active side hostname "ProCurve" interface lacp Active The trunk group defined on ProCurve is a Dynamic trunk Dyn1 and belongs to Vlan1.

26 It cannot be assigned to any other vlans except via GVRP. To allocate trunk port to Vlans, one should prefer the static trunk, with or without LACP or FEC protocols. Static LACP trunk On a HP ProCurve switch, a trunk can be defined as static LACP. Trunk will form itself unconditionally and LACP frames will be sent. The remote side will form automatically if in LACP passive mode. Sample topology Cisco-2 Channel Fa1/0/1-6 Int Po 1 = /24 Trunk A1 - A6 Vlan 10 = /24 Procurve-2 In the following example, the trunk is defined with 6 Ports and as a Layer 3 trunk. HP Static LACP trunk configuration The following defines a trunk as static LACP. The trunk group trk1 is then assigned to Vlan 10 in which an IP address is defined. Conf t trunk a1-a6 trk1 lacp vlan 10 untagged trk1 ip address /24 ProCurve1# show trunk Load Balancing Port Name Type Group Type A1 100/1000T Trk1 LACP

27 A2 100/1000T Trk1 LACP A3 100/1000T Trk1 LACP A4 100/1000T Trk1 LACP A5 100/1000T Trk1 LACP A6 100/1000T Trk1 LACP ProCurve1# show lacp LACP PORT LACP TRUNK PORT LACP LACP NUMB ENABLED GROUP STATUS PARTNER STATUS A1 Active Trk1 Up Yes Success A2 Active Trk1 Up Yes Success A3 Active Trk1 Up Yes Success A4 Active Trk1 Up Yes Success A5 Active Trk1 Up Yes Success A6 Active Trk1 Up Yes Success ProCurve1# ping is alive, time = 1 ms Configuration of Cisco LACP passive channel The no switchport command is required to define a channel as L3 channel. Ports are defines in LACP passive mode conf t interface range FastEthernet1/0/1-6 no switchport channel-group 1 mode passive IP address is defined on the Port-Channel interface. interface Port-channel1 no switchport ip address end Check channel status Cisco1#sh etherchannel 1 summary Flags: D - down P - in port-channel I - stand-alone s - suspended H - Hot-standby (LACP only) R - Layer3 S - Layer2 U - in use f - failed to allocate aggregator u - unsuitable for bundling w - waiting to be aggregated d - default port Number of channel-groups in use: 1 Number of aggregators: 1 Group Port-channel Protocol Ports Po1(RU) LACP Fa1/0/1(P) Fa1/0/2(P) Fa1/0/3(P) Fa1/0/4(P) Fa1/0/5(P) Fa1/0/6(P)

28 Detailed display shows that a channel is created, LACP is the protocol in use, info about Local switch and partner. Cisco1#sh etherchannel 1 detail Group state = L3 Ports: 6 Maxports = 16 Port-channels: 1 Max Port-channels = 16 Protocol: LACP Ports in the group: Port: Fa1/0/ Port state = Up Mstr In-Bndl Channel group = 1 Mode = Passive Gcchange = - Port-channel = Po1 GC = - Pseudo port-channel = Po1 Port index = 0 Load = 0x00 Protocol = LACP Flags: S - Device is sending Slow LACPDUs LACPDUs. A - Device is in active mode. mode. F - Device is sending fast P - Device is in passive Local information: LACP port Admin Oper Port Port Port Flags State Priority Key Key Number State Fa1/0/1 SP bndl x1 0x1 0x3FB 0x3C Partner's information: LACP port Oper Port Port Port Flags Priority Dev ID Age Key Number State Fa1/0/1 SA 0 000e.7f s 0xD2 0x1 0x3D (skip info ) Port-channels in the group: Port-channel: Po1 (Primary Aggregator) Age of the Port-channel = 00d:07h:30m:17s Logical slot/port = 10/1 Number of ports = 6 HotStandBy port = null Passive port list = Fa1/0/1 Fa1/0/2 Fa1/0/3 Fa1/0/4 Fa1/0/5 Fa1/0/6 Port state = Port-channel L3-Ag Ag-Inuse Protocol = LACP Ports in the Port-channel: Index Load Port EC state No of bits Fa1/0/1 Passive Fa1/0/2 Passive Fa1/0/3 Passive Fa1/0/4 Passive Fa1/0/5 Passive Fa1/0/6 Passive 0 Time since last port bundled: 00d:00h:01m:12s Fa1/0/6 Time since last port Un-bundled: 00d:00h:01m:55s Fa1/0/6

29 Spanning-Tree 31- Introduction 32- MSTP 33- PVST and RSTP 321- Cisco as Core, ProCurve as Edge 322- ProCurve as Core, Cisco as Edge Introduction Glossary STP is Spanning-Tree Protocol The IEEE standard implementation of STP is 802.1D. RSTP is Rapid Spanning-Tree Protocol defined by the 802.1w IEEE standard. MSTP is Multiple Spanning-Tree Protocol defined by the 802.1s IEEE standard. PVST is Per VLAN Spanning-tree proprietary implementation of STP on Cisco equipment PVST+ is the implementation of PVST on 802.1q links. Spanning-Tree on HP ProCurve Switches 802.1D and 802.1w (RSTP) All HP ProCurve switches implement both of these STP standards. On HP ProCurve, Spanning-Tree has to be activated, the default mode is then Rapid STP. MSTP 802.1s It is supported on most manageable switches except 2500 and 4100 switches Please refer to switch documentation. Spanning-Tree on Cisco Switches PVST+ By default, Cisco switches run PVST+. PVST is the implementation of STP on ISL links (Cisco proprietary multi-vlan encapsulation) while PVST+ runs on 802.1q links. In PVST+, there is one instance of STP per VLAN and BPDUs use a proprietary Multicast Mac Address. They are not understood by HP ProCurve switches (except by ProCurve 9300M and 9400M) and are then flooded as a regular multicast. So, regarding PVST+ BPDUs, HP ProCurve switches appear as a hub. However, Native VLAN (untagged VLAN of a tagged link equal to VLAN 1 be default) is an exception. In Native VLAN, the Cisco switches send standard STP BPDUs, which are understood by HP ProCurve switches. This is how both platform interact.

30 Cisco has also introduced Rapid PVST+, a PVST+ implementation that integrates Rapid STP principles. Prestandard MSTP MSTP should not be confused with the prestandard version of MSTP. MSTP (802.1s) You must run the latest versions of IOS to get support of MSTP (check on Cisco web site). Caution Support for the IEEE 802.1s standard has been introduced around September 2005 by Cisco in the IOS. One should refer to Cisco web site for IOS support of compliant MSTP (*). Caution should be taken on not confusing the prestandard MST and the compliant IEEE 802.1s MST. If configuration of both modes looks exactly the same, the prestandard does NOT interoperate with the MSTP on ProCurve as this one complies with IEEE 802.1s standard. (*) Versions of IOS implementing the Compliant IEEE 802.1s starts with: 12.2(18) for Catalyst 6500, 12.2(25)SG for Catalyst 4500 and 12.2(25)SEC on Catalyst 35xx, 37xx, and What Spanning-Tree mode should you choose between Cisco and ProCurve Switches? MSTP is obviously the ideal choice because it is standard based and supported by both vendors, it converges quickly and allows load-balancing of traffic on uplinks with appropriate configuration. If not all your devices support MSTP yet, a progressive migration to MSTP can be put in place as it interoperates with Standard, Rapid Spanning Tree modes and with PVST via the Native Vlan. Note that all STP modes interoperate via the standard spanning-tree mode also named the Common Spanning-Tree (CST). So whatever is your choice, you should always carefully define the root and secondary root of the CST. On Cisco look after priority of STP in the Native Vlan (vlan 1 by default), on ProCurve look after the global priority of STP.

31 MSTP Configuration Gi1/1 e 1 Procurve-Edge-1 e 2 Gi1/1 Gi1/3 Gi1/2 Gi1/3 Gi1/2 Cisco-Core-1 Cisco-Core-2 e 1 e 2 Procurve-Edge-2 The parameters for the MSTP domain has been defined as followed: Configuration Name = procurve-cisco (case sensitive) Configuration Number = 1 Instance 1 = vlans 1, 10, 20 Instance 2 = vlans 30, 40 Configuration of Cisco-Core-1 hostname Core-Cisco-1 Following defines MST mode (802.1s) spanning-tree mode mst spanning-tree extend system-id All parameters of the MSTP configuration must match on all switches of the MSTP domain. spanning-tree mst configuration name procurve-cisco revision 1 instance 1 vlan 1, 10, 20 instance 2 vlan 30, 40 For load balancing of traffic among links, Cisco-core-1 is defined as Root of instance 0 and 1 (priority 0) and secondary root of instance 2 (priority 4096) spanning-tree mst 0-1 priority 0 spanning-tree mst 2 priority 4096 VLAN Creation

32 VLAN 1 exists by default vlan 10,20,30,40 Uplinks are defined as 802.1q links. They are named trunks in Cisco terminology and tagged links in ProCurve terminology. The nonegogiate feature means that we do no use the Dynamic Trunk Protocol to negotiate the status of the uplink. interface range GigabitEthernet0/1-3 switchport trunk encapsulation dot1q switchport mode trunk switchport nonegotiate Access ports (Cisco Terminology) or Edge ports (ProCurve terminology) are defined as untagged members of a Vlan. The portfast mode defines them as Edge port in Spanning tree terminology. Interface range GigabitEthernet0/4-10 switchport access vlan 10 switchport mode access spanning-tree portfast! interface range GigabitEthernet0/11-24 switchport access vlan 20 switchport mode access spanning-tree portfast IP configuration. ip routing The Virtual IP used as Default Gateway for the various VLANs are set using HSRP (Hot Standby Router Protocol), the Cisco proprietary protocol. As Cisco-Core-1 is the Root of MST instance 1, we also set it as Master of the Virtual IP of Vlans 1, 10 & 20. And as it is secondary root for MST instance 2, we define it as the Backup of Virtual IP in Vlans 30 & 40. interface Vlan1 ip address standby 1 ip standby 1 timers 1 3 standby 1 priority 255 standby 1 preempt! interface Vlan10 ip address standby 10 ip standby 10 timers 1 3 standby 10 priority 255 standby 10 preempt! interface Vlan20 ip address standby 20 ip standby 20 timers 1 3 standby 20 priority 255 standby 20 preempt! interface Vlan30 ip address standby 30 ip standby 30 timers 1 3! interface Vlan40

33 ip address standby 40 ip standby 40 timers 1 3! end Core-cisco-2 configuration hostname Core-Cisco-2! Global Configuration is similar to the configuration of Cisco-Core-1 spanning-tree mode mst spanning-tree extend system-id spanning-tree mst configuration name procurve-cisco revision 1 instance 1 vlan 1, 10, 20 instance 2 vlan 30, 40 For load balancing of traffic among uplinks, Cisco-core-2 is defined as Root of instance 2 (priority 0) and secondary root of instance 0 and 1 (priority 4096) spanning-tree mst 0-1 priority 4096 spanning-tree mst 2 priority 0! vlan 10,20,30,40! For load balancing of traffic among uplinks, Cisco-core-2 is defined as Root of instance 2 and secondary root of instances 0 and 1. interface range GigabitEthernet0/1-3 switchport trunk encapsulation dot1q switchport mode trunk switchport nonegotiate!! ip routing Because Cisco-Core-2 is set as the secondary Root of MST instance 1, we define it as HSRP backup of the Virtual IP of VLANs 1, 10 & 20. And because it is root of MST instance 2, we set it as the Master of Virtual IP in VLANs 30 & 40. interface Vlan1 ip address standby 1 ip standby 1 timers 1 3! interface Vlan10 ip address standby 10 ip standby 10 timers 1 3! interface Vlan20 ip address standby 20 ip standby 20 timers 1 3! interface Vlan30 ip address standby 30 ip standby 30 timers 1 3 standby 30 priority 255

34 standby 30 preempt! interface Vlan40 ip address standby 40 ip standby 40 timers 1 3 standby 40 priority 255 standby 40 preempt end ProCurve-Edge-1 Configuration ProCurve-Edge-1 is a 3500yl. hostname "ProCurve-Edge-1" VLAN configuration Uplinks ports are 1 and 2 vlan 1 name "DEFAULT_VLAN" untagged 1-24 ip address vlan 10 name "VLAN10" untagged tagged 1-2 no ip address vlan 20 name "VLAN20" untagged tagged 1-2 no ip address vlan 30 name "VLAN30" untagged tagged 1-2 no ip address vlan 40 name "VLAN40" untagged tagged 1-2 no ip address Let s enable Spanning-tree. It default on MSTP on the latest ProCurve switches: 3500yl, 5400zl and 4200vl spanning-tree Default port configuration in MSTP is non Edge and Point-to-Point. We define Edge ports as Edge. spanning-tree edge-port MSTP Configuration: Name, Revision and instances match the one of other switches in MSTP domain spanning-tree config-name "procurve-cisco" spanning-tree config-revision 1

35 spanning-tree instance 1 vlan spanning-tree instance 2 vlan ProCurve-Edge-2 Configuration Configuration is similar to the configuration of ProCurve-Edge-1. In our example ProCurve-Edge-2 is a Spanning-tree mode defaults to RSTP. And we have to turn it on MSTP mode that requires a reboot. hostname "ProCurve-Edge-2" max-vlans 16 vlan 1 name "DEFAULT_VLAN" untagged 1-9,18-24 ip address no untagged vlan 10 name "VLAN10" untagged tagged 1-2 vlan 20 name "VLAN20" untagged no ip address tagged 1-2 vlan 30 name "VLAN30" untagged no ip address tagged 1-2 vlan 40 name "VLAN40" untagged no ip address tagged 1-2 spanning-tree spanning-tree protocol-version MSTP spanning-tree edge-port spanning-tree config-name "procurve-cisco" spanning-tree config-revision 1 spanning-tree instance 1 vlan spanning-tree instance 2 vlan Checking configuration of MSTP In the following displays: note that the Mac Address of Cisco Core-1 is db or 00100d-b17100 Mac Address of Cisco Core-2 is db or 00100d-b31200

36 On Cisco-Core-1 The following command displays the parameters of MSTP configuration. Note that Cisco shows all the non assigned VLANs in Instance 0 (=IST Instance) where ProCurve shows the non assigned AND created Vlans only. Core-Cisco-1#show spanning-tree mst configuration Name [procurve-cisco] Revision 1 Instances configured 3 Instance Vlans mapped ,11-19,21-29,31-39, ,10, , Status of MSTP spanning tree in each instance. Cisco-Core-1 (0010.0db ) is root in instances 0 and 1. Cisco-Core-2 (0010.0db1.7100) is root in instance 2. Core-Cisco-1#show spanning-tree mst ##### MST0 vlans mapped: 2-9,11-19,21-29,31-39, Bridge address db priority 0 (0 sysid 0) Root this switch for the CIST Operational hello time 2, forward delay 15, max age 20, txholdcount 6 Configured hello time 2, forward delay 15, max age 20, max hops 20 Interface Role Sts Cost Prio.Nbr Type Gi1/1 Desg FWD P2p Gi1/2 Desg FWD P2p Gi1/3 Desg FWD P2p Gi1/45 Desg FWD Edge P2p ##### MST1 vlans mapped: 1,10,20 Bridge address db priority 1 (0 sysid 1) Root this switch for MST1 Interface Role Sts Cost Prio.Nbr Type Gi1/1 Desg FWD P2p Gi1/2 Desg FWD P2p Gi1/3 Desg FWD P2p Gi1/45 Desg FWD Edge P2p ##### MST2 vlans mapped: 30,40 Bridge address db priority 4098 (4096 sysid 2) Root address db priority 2 (0 sysid 2) port Gi1/3 cost rem hops19 Interface Role Sts Cost Prio.Nbr Type Gi1/1 Desg FWD P2p Gi1/2 Desg FWD P2p Gi1/3 Root FWD P2p On Cisco-Core-2 Parameters of MSTP configuration. Core-Cisco-2#show spanning-tree mst configuration Name [procurve-cisco] Revision 1 Instances configured 3

37 Instance Vlans mapped ,11-19,21-29,31-39, ,10, , Status of MSTP spanning tree in each instance. Cisco-Core-1 (0010.0db ) is root in instances 0 and 1. Cisco-Core-2 (0010.0db3.1200) is root in instance 2. Core-Cisco-2#show spanning-tree mst ##### MST0 vlans mapped: 2-9,11-19,21-29,31-39, Bridge address db priority 4096 (4096 sysid 0) Root address db priority 0 (0 sysid 0) port Gi1/3 path cost 0 Regional Root address db priority 0 (0 sysid 0) internal cost rem hops 19 Operational hello time 2, forward delay 15, max age 20, txholdcount 6 Configured hello time 2, forward delay 15, max age 20, max hops 20 Interface Role Sts Cost Prio.Nbr Type Gi1/1 Desg FWD P2p Gi1/2 Desg FWD P2p Gi1/3 Root FWD P2p ##### MST1 vlans mapped: 1,10,20 Bridge address db priority 4097 (4096 sysid 1) Root address db priority 1 (0 sysid 1) port Gi1/3 cost rem hops 19 Interface Role Sts Cost Prio.Nbr Type Gi1/1 Desg FWD P2p Gi1/2 Desg FWD P2p Gi1/3 Root FWD P2p ##### MST2 vlans mapped: 30,40 Bridge address db priority 2 (0 sysid 2) Root this switch for MST2 Interface Role Sts Cost Prio.Nbr Type Gi1/1 Desg FWD P2p Gi1/2 Desg FWD P2p Gi1/3 Desg FWD P2p On ProCurve-Edge-1 Parameters of MSTP configuration. Note that display shows IST instance without any Vlans. In fact the vlans, including those not yet created, that are not associated with an existing instance are mapped to the IST instance. ProCurve-Edge-1# show spanning-tree mst-config MST Configuration Identifier Information MST Configuration Name : procurve-cisco MST Configuration Revision : 1

38 MST Configuration Digest : 0x2DC307C6A31621DC E69C4E IST Mapped VLANs : Instance ID Mapped VLANs ,10, ,40 The following display shows ports configuration. Note that uplinks are set as Non edge and others are set as Edge. ProCurve-Edge-1# show spanning-tree 1-5 config Multiple Spanning Tree (MST) Configuration Information STP Enabled [No] : Yes Force Version [MSTP-operation] : MSTP-operation Default Path Costs [802.1t] : 802.1t MST Configuration Name : procurve-cisco MST Configuration Revision : 1 Switch Priority : Forward Delay [15] : 15 Hello Time [2] : 2 Max Age [20] : 20 Max Hops [20] : 20 Prio BPDU Port Type Cost rity Edge Pnt-to-Pnt MCheck Hello Time Filter /1000T Auto 128 No Force-True Yes Use Global No 2 100/1000T Auto 128 No Force-True Yes Use Global No 3 100/1000T Auto 128 No Force-True Yes Use Global No 4 100/1000T Auto 128 Yes Force-True Yes Use Global No 5 100/1000T Auto 128 Yes Force-True Yes Use Global No Status in IST Instance: Root port is 1 and alternate (blocked) is 2 ProCurve-Edge-1# show spanning-tree 1-2 instance ist IST Instance Information Instance ID : 0 Mapped VLANs : Switch Priority : Topology Change Count : 4 Time Since Last Change : 11 mins Regional Root MAC Address : 00100d-b17100 Regional Root Priority : 0 Regional Root Path Cost : Regional Root Port : 1 Remaining Hops : 19 Designated Port Type Cost Priority Role State Bridge /1000T Root Forwarding 00100d-b /1000T Alternate Blocking 00100d-b31200 Status in Instance 1: Root port is 1 and alternate (blocked) is 2 ProCurve-Edge-1# show spanning-tree 1-2 instance 1 MST Instance Information Instance ID : 1 Mapped VLANs : 1,10,20

39 Switch Priority : Topology Change Count : 2 Time Since Last Change : 13 mins Regional Root MAC Address : 00100d-b17100 Regional Root Priority : 0 Regional Root Path Cost : Regional Root Port : 1 Remaining Hops : 19 Designated Port Type Cost Priority Role State Bridge /1000T Root Forwarding 00100d-b /1000T Alternate Blocking 00100d-b31200 Status in Instance 2: Root port is 2 and alternate (blocked) is 1 ProCurve-Edge-1# show spanning-tree 1-2 instance 2 MST Instance Information Instance ID : 2 Mapped VLANs : 30,40 Switch Priority : Topology Change Count : 4 Time Since Last Change : 13 mins Regional Root MAC Address : 00100d-b31200 Regional Root Priority : 0 Regional Root Path Cost : Regional Root Port : 2 Remaining Hops : 19 Designated Port Type Cost Priority Role State Bridge /1000T Alternate Blocking 00100d-b /1000T Root Forwarding 00100d-b31200 ProCurve-Edge-1# show spanning-tree 1-2 Multiple Spanning Tree (MST) Information STP Enabled : Yes Force Version : MSTP-operation IST Mapped VLANs : Filtered Ports : Switch MAC Address : b487c0 Switch Priority : Max Age : 20 Max Hops : 20 Forward Delay : 15 Topology Change Count : 10 Time Since Last Change : 53 secs CST Root MAC Address : 00100d-b31200 CST Root Priority : 4096 CST Root Path Cost : 0 CST Root Port : 2 IST Regional Root MAC Address : 00100d-b31200 IST Regional Root Priority : 4096 IST Regional Root Path Cost : IST Remaining Hops : 19

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