Configuring Single Instance Rapid Spanning Tree Protocol (RSTP) between an Avaya C360 Converged Switch and HP ProCurve Networking Switches to support Avaya IP Telephony Issue 1.0 Abstract These Application Notes describe a single-instance Rapid Spanning Tree Protocol (RSTP) configuration with an Avaya C363T-PWR Converged Switch and HP ProCurve Networking Switches exhibiting basic switch-to-switch redundancy. Primary and secondary infrastructure links were used to demonstrate RSTP compatibility between Avaya and HP Layer-2 switching. Avaya IP Telephony was implemented in this configuration to demonstrate link resiliency through the use of RSTP to maintain voice over IP traffic without interruption of service in the event of link failure. 1 of 16
1. Introduction The IEEE 802.1w Rapid Spanning Tree Protocol (RSTP) was developed to decrease the recovery time of redundant paths in Layer 2 networks and reduce the impact of accidental network loops. RSTP can reduce the spanning tree convergence time to 5 seconds or less to establish a network path and reduce network downtime. The IEEE 802.1d root port and designated port roles used in normal spanning-tree operation remain the same in rapid spanning-tree. However the blocking port role is now split into backup and alternate port roles. The alternate port provides an alternate path in the direction of the root bridge in the event that the root port fails. In the network diagram depicted in Figure 1, all switches configured are connected by 1000 Base SX links as redundancy pairs. When a link becomes out of service, the redundant link will become active to maintain Layer-2 connectivity. The HP ProCurve 5304XL will provide IP routing to enable multi-vlan connectivity between the Avaya C363T-PWR Converged Switch, the Avaya G350 Media Gateway and the HP ProCurve 2626-PWR Networking Switch. A DHCP server was configured with multiple scopes to provide IP addressing and registration parameters for the Avaya IP Telephones connected to the edge switches. Figure 1: Network Diagram for RSTP Configuration 2 of 16
2. Equipment and Software Validated The following equipment and software were used for the sample configuration provided: Equipment Software Avaya C363T-PWR Converged Switch 4.5.14 Avaya G350 Media Gateway 24.17 Avaya S8300 Media Server v340.3 Avaya 4620 IP Telephone v2.2 HP ProCurve 5304XL Networking Switch E.10.01 HP ProCurve 2626-PWR Networking Switch H.08.69 Microsoft DHCP Server v4.0 3. Rapid Spanning Tree 802.1w Approach The Avaya C363T-PWR Converged Switch and Avaya G350 Media Gateway support an implementation of RSTP that is compatible with the IEEE 802.1d standard and does not support per VLAN RSTP. This means that Avaya C363T-PWR Converged Switch and Avaya G350 Media Gateway will send out and expect to receive untagged RSTP messages. Therefore, all the switches configured must use the standard IEEE 802.1d for RSTP compatibility. Directly connected trunk ports between switches are explicitly configured as point-topoint for fast convergence and as non-edge ports. All access ports for shared media are explicitly configured to be edge ports to transition rapidly to forwarding state when the link becomes in-service. If the port detects a BPDU from another bridge, the operational edge port will transition to false and the port will participate in the topology. To assist with the understanding of the output from show commands, the HP ProCurve 5304XL Networking Switch is configured as a root bridge with STP priority 0. The Avaya C363T-PWR Converged Switch is configured as a first backup bridge with STP priority 4096 and the HP ProCurve 2626-PWR Networking Switch is configured as second backup bridge with STP priority 8192. The Avaya G350 Media Gateway is configured with a low STP priority to avoiding challenging the switches configured as root and backup bridges. Note that a lower value translates to higher root bridge precedence. 4. Avaya C363T-PWR Switch Configuration Start a terminal session to the Avaya C363T-PWR Converged Switch and log into the console using valid login credentials. Listed below are the configuration steps used to enable RSTP: 3 of 16
Create the Virtual LANs on the switch. Assign the native VLAN to edge ports and statically assign the voice VLAN on the same edge ports to allow broadcasts from either VLAN. This procedure provides the flexibility of connecting either an Avaya IP Telephone, stand-alone PC or both to a configured edge port. set vlan 40 name vlan40 set vlan 60 name vlan60 set port vlan 40 1/1 set port static-vlan 1/1 60 Optionally, dot1q trunking can be enabled on the edge port connecting the Avaya IP Telephone with inline PC to accept tagged frames and forward untagged frames to the native VLAN. This provides a more secure method of segmenting VLAN broadcast domains while differentiating voice and data traffic. set trunk 1/1 dot1q set port vlan-binding-mode 1/1 static Note: An edge port configured using the alternative procedure with dot1q enabled instead of shared access does not have the same flexibility as the initial method and cannot accept a directly-connected PC without an Avaya IP Telephone forwarding the untagged frames Enable dot1q trunking on all infrastructure ports and bind the configured VLANs. Configure IP addressing for the inband management interface and set the default gateway. set trunk 1/51-52 dot1q set port vlan-binding-mode 1/51-52 bind-to-configured set interface inband 40 40.1.1.2 255.255.255.0 set ip route 0.0.0.0 40.1.1.1 Globally enable the spanning-tree algorithm and configure the switch for RSTP operation. Enable the default path cost for RSTP and set the RSTP priority value as the first backup bridge to the configured root bridge. set spantree enable set spantree version rapid-spanning-tree set spantree default-path-cost rapid-spanning-tree set spantree priority 4096 4 of 16
Set the infrastructure ports as non-edge ports and force point-to-point MAC address forwarding. Set the classification of the infrastructure ports to valuable to erase all learned MAC addressing during changes in RSTP state. set port edge admin state 1/51-52 non-edge-port set port point-to-point admin status 1/51-52 force-true set port classification 1/51-52 valuable Set all ports designated for shared media as edge ports and disable point-to-point MAC forwarding. Set the classification of the infrastructure ports to regular to maintain all learned MAC addressing during changes in RSTP state set port edge admin state 1/1 edge-port set port point-to-point admin status 1/1 force-false set port classification 1/1 regular 5. HP ProCurve 5304XL Switch Configuration Start a terminal session to the HP ProCurve 5304XL Switch and log into the console using valid login credentials. Listed below are the steps used to configure RSTP on the HP ProCurve 5304XL Switch: Create a Virtual LAN on the switch and configure an IP address for each VLAN Enable IP routing to route traffic between VLANs. vlan 30 ip address 30.1.1.1 255.255.255.0 vlan 40 ip address 40.1.1.1 255.255.255.0 vlan 50 ip address 50.1.1.1 255.255.255.0 vlan 60 ip address 60.1.1.1 255.255.255.0 ip routing 5 of 16
Configure infrastructure ports as tagged ports to enable 802.1Q trunking and configure edge ports hosting shared media as untagged ports. Configure the IP address of the DHCP Server on each VLANs designated to forward DHCP requests to IP Telephone and attached PCs. vlan 30 tagged A1-A2 ip helper-address 50.1.1.50 vlan 40 tagged A3-A4 ip helper-address 50.1.1.50 vlan 50 untagged B1-B2, B5 vlan 60 tagged A1-A4, B1-B2 ip helper-address 50.1.1.50 Note: The DHCP relay parameter on the HP ProCurve 5304XL Networking Switch is enabled by default Globally enable the spanning-tree algorithm. Configure the switch to use RSTP as the spanning-tree protocol and force RSTP compatibility. Set a RSTP priority value of zero to force the switch to assume root bridge. spanning-tree spanning-tree force-version rstp spanning-tree protocol-version rstp spanning-tree priority 0 Disable edge port feature on all switch-to-switch trunk ports and enable each link as point-to-point. no spanning-tree ethernet a1-a4, b1-b2 edge-port spanning-tree ethernet a1-a4, b1-b2 point-to-point-mac force-true Designate shared LAN segments as edge ports and disable point-to-point forwarding of MAC addressing. spanning-tree ethernet b5 edge-port spanning-tree ethernet b5 point-to-point-mac force-false 6 of 16
6. HP ProCurve 2626-PWR Switch Configuration Start a terminal session to the HP ProCurve 2626-PWR Switch and log into the console using valid login credentials. Listed below are the steps used to configure RSTP on the HP ProCurve 2626-PWR Switch: Create Virtual LANs on the switch and configure an IP address for the primary VLAN. The primary VLAN is dedicated for management features and must be configured in order to propagate DHCP-resolved parameters to the correct VLAN. vlan 30 ip address 30.1.1.2 255.255.255.0 vlan 60 primary-vlan 30 Configure infrastructure ports as tagged ports to enable 802.1Q trunking and configure edge ports hosting shared media as untagged ports. Set the default gateway. vlan 30 tagged 25-26 untagged 1 vlan 60 tagged 1,25-26 ip default-gateway 30.1.1.1 Globally enable the spanning-tree algorithm. Configure the switch to use RSTP as the spanning-tree protocol and force RSTP compatibility. Set the RSTP priority value as the second backup bridge to the configured root bridge. spanning-tree spanning-tree protocol-version rstp spanning-tree force-version rstp spanning-tree priority 2 Note: HP ProCurve 2626-PWR uses single-digits to segment and administer priority settings instead of segments of 4096 (4096 * 2 = 8192). 7 of 16
Disable the edge port feature on all switch-to-switch trunk ports and enable each link as point-to-point. no spanning-tree ethernet 25-26 edge-port spanning-tree ethernet 25-26 point-to-point-mac force-true Designate shared LAN segments as edge ports and disable point-to-point forwarding of MAC addressing. spanning-tree ethernet 1 edge-port spanning-tree ethernet 1 point-to-point-mac force-false 7. Avaya Communication Manager The Avaya G350 Media Gateway will be used to forward Voice over IP traffic and control IP Phone registration in conjunction with the Avaya S8300 Media Server. 7.1. Avaya G350 Media Gateway Start a terminal session to the Avaya G350 Media Gateway and log into the console using valid login credentials. Listed below are the steps used to configure RSTP on the Avaya G350 Media Gateway: Create the assigned data and voice VLANs on the G350 switch. Enable dot1q trunking on the LAN ports and bind the configured VLANs set vlan 50 name vlan50 set vlan 60 name vlan60 set trunk 6/1-2 dot1q set port vlan-binding-mode 6/1-2 bind-to-configured Configure IP addressing for the inband VLAN interface designated as the primary management interface. Configure the VLAN hosting the Avaya S8300 Media Server as the ICC VLAN interface Vlan 50 ip address 50.1.1.5 255.255.255.0 pmi interface Vlan 60 icc-vlan 8 of 16
Globally enable the spanning-tree algorithm and configure the G350 Media Gateway for RSTP operation. Enable the default path cost for RSTP and set a high RSTP priority value to ensure the G350 does not assume a backup role to the configured root bridge. set spantree enable set spantree version rapid-spanning-tree set spantree default-path-cost rapid-spanning-tree set spantree priority 61440 Set the connected LAN ports on the G350 Media Gateway as non-edge and force point-to-point MAC address forwarding. Set the classification of the infrastructure ports to valuable to erase all learned MAC addressing during changes in RSTP state. set port edge admin state 6/1-2 non-edge-port set port point-to-point admin status 6/1-2 force-true set port classification 6/1-2 valuable Add the IP address of the Avaya S8300 Media Server communicating with Avaya G350 Media Gateway and set the default gateway. set mgc list 60.1.1.5 ip default-gateway 50.1.1.1 7.2. Avaya S8300 Media Server For brevity, this section will assume the viewer of these Application Notes has a fundamental understanding of Avaya IP Telephony and will not cover details regarding the configuration of Avaya Communication Manager. See the additional references in Section 10 for further information. 7.3. DHCP registration for Avaya 4620 IP Telephone A Microsoft DHCP Server was used by the Avaya 4620 IP Telephones to register with the Avaya S8300 Media Server. Three separate scopes were used for DHCP registration: two for data (VLAN 30 and VLAN 40) and one for voice (VLAN 60). In addition to IP addressing and dot1q tagging, another option was created for the voice VLAN to define the call server and call server port for phone registration. 9 of 16
The following scopes were defined on the Microsoft DHCP Server for each VLAN: Scope [30.1.1.0] Data VLAN 30 Address Pool: Start Address: 30.1.1.100 End Address: 30.1.1.110 Subnet mask: 255.255.255.0 Option 003 Router: 30.1.1.1 Option 176 Avaya Option: L2Q=1,L2QVLAN=60 Scope [40.1.1.0] Data VLAN 40 Address Pool: Start Address: 40.1.1.100 End Address: 40.1.1.110 Subnet mask: 255.255.255.0 Option 003 Router: 40.1.1.1 Option 176 Avaya Option: L2Q=1,L2QVLAN=60 Scope [60.1.1.0] Voice VLAN Address Pool: Start Address: 60.1.1.100 End Address: 60.1.1.110 Subnet mask: 255.255.255.0 Option 003 Router: 60.1.1.1 Option 176 Avaya Option: MCIPADD=60.1.1.5,MCPORT=1719 8. Verification These Application Notes were confirmed using the verification and troubleshooting commands listed in the individual switch configuration section. While there is one path in the network, traffic from edge nodes should pass and network interruption should be less than 5 seconds. If a ping fails or the network interruption is more than 5 seconds, use the troubleshooting commands in the configuration section for each switch to isolate the problem. 1. After connecting either configuration depicted, verify that no loops have occurred by using vendor-specific RSTP commands and viewing interface statistics. 2. Disconnect primary links and observe that the redundant links become active and rapidly transition to the forwarding state. Convergence times should be on the order of 5 seconds or less. 3. Reconnect previously disconnect primary links and observe the transition to the forwarding state and the corresponding redundant links transition to the blocking state. 8.1. Avaya C363T-PWR RSTP Verification The following show commands will provide RSTP status information for the Avaya C363T-PWR Converged Switch: 10 of 16
show spanning-tree Spanning tree state is enabled Designated Root: 00-08-83-74-62-00 Designated Root Priority: 0 Designated Root Cost: 20000 Designated Root Port: 1/51 Root Max Age: 20 Hello Time: 2 Root Forward Delay: 15 Bridge ID MAC ADDR: 00-04-0d-3f-91-ff Bridge ID priority: 4096 Bridge Max Age: 20 Bridge Hello Time: 2 Bridge Forward Delay: 15 Tx Hold Count 3 Spanning Tree Version is rapid spanning tree Spanning Tree Default Path Costs is according to rapid spanning tree Port State Cost Priority ------ ------------- ---------- ------------ 1 /1 Forwarding 200000 128 --- Output omitted --- 1 /51 Forwarding 20000 128 1 /52 Blocking 20000 128 show port classification Port Port Classification ------ --------------------- 1/1 regular --- Output omitted --- 1/51 valuable 1/52 valuable show port edge state Port admin state oper state ------- ------------- ------------- 1/1 edge-port edge-port --- Output omitted --- 1/51 non-edge-port non-edge-port 1/52 non-edge-port non-edge-port 11 of 16
show port point-to-point status Port point-to-point admin state point-to-point oper state ------- ---------------------------- -------------------------- 1/1 force-false shared media connection --- Output omitted --- 1/51 force-true point to point connection 1/52 force-true point to point connection 8.2. Avaya G350 Media Gateway RSTP Verification The following show commands will provide RSTP status information for the Avaya G350 Media Gateway: show spanning-tree Designated Root: 00-08-83-74-62-00 Designated Root Priority: 0 Designated Root Cost: 200000 Designated Root Port: 6/1 Root Max Age: 20 Hello Time: 2 Root Forward Delay: 15 Bridge ID MAC ADDR: 00-04-0d-29-d2-f6 Bridge ID priority: 61440 Bridge Max Age: 20 Bridge Hello Time: 2 Bridge Forward Delay: 15 Tx Hold Count 3 Spanning Tree Version is rapid spanning tree Spanning Tree Default Path Costs is according to rapid spanning tree show port classification Port Port Classification ------ --------------------- 6/1 valuable 6/2 valuable show port point-to-point status Port point-to-point admin state point-to-point oper state ------- ---------------------------- -------------------------- 6/1 force-true point to point connection 6/2 force-true point to point connection 12 of 16
8.3. HP ProCurve 5304XL RSTP Verification The following show commands will provide RSTP status information for the HP ProCurve 5304XL Networking Switch: show spanning-tree STP Enabled : Yes Force Version : RSTP-operation Switch Priority : 0 Hello Time : 2 Max Age : 20 Forward Delay : 15 Topology Change Count : 9 Time Since Last Change : 2 days Root MAC Address : 000883-746200 Root Path Cost : 0 Root Port : This switch is root Root Priority : 0 Port Type Cost Priority State Designated Bridge ---- --------- --------- -------- ---------- + ----------------- A1 1000SX 20000 128 Forwarding 000883-746200 A2 1000SX 20000 128 Forwarding 000883-746200 A3 1000SX 20000 128 Forwarding 000883-746200 A4 1000SX 20000 128 Forwarding 000883-746200 show spanning-tree config detail STP Enabled [No] : Yes Force Version [RSTP-operation] : RSTP-operation Switch Priority [8] : 0 Hello Time [2] : 2 Max Age [20] : 20 Forward Delay [15] : 15 Port Type Cost Priority Edge Point-to-Point MCheck ---- --------- + --------- -------- ---- -------------- ------ A1 1000SX 20000 8 No Force-True Yes A2 1000SX 20000 8 No Force-True Yes A1 1000SX 20000 8 No Force-True Yes A2 1000SX 20000 8 No Force-True Yes --- Output omitted --- B1 10/100TX 200000 8 Yes Force-False Yes 13 of 16
8.4. HP ProCurve 2626-PWR RSTP Verification The following show commands will provide RSTP status information for the HP ProCurve 2626-PWR Networking Switch: show spanning-tree STP Enabled : Yes Force Version : RSTP-operation Switch Priority : 8192 Hello Time : 2 Max Age : 20 Forward Delay : 15 Topology Change Count : 9 Time Since Last Change : 2 days Root MAC Address : 000883-746200 Root Path Cost : 0 Root Port : 25 Root Priority : 0 Port Type Cost Priority State Designated Bridge ---- --------- --------- -------- ---------- + ----------------- --- Output omitted --- 25 1000SX 20000 128 Forwarding 000883-746200 26 1000SX 20000 128 Blocking 000883-746200 show spanning-tree config detail STP Enabled [No] : Yes Force Version [RSTP-operation] : RSTP-operation Switch Priority [8] : 8192 Hello Time [2] : 2 Max Age [20] : 20 Forward Delay [15] : 15 Port Type Cost Priority Edge Point-to-Point MCheck ---- --------- + --------- -------- ---- -------------- ------ 1 10/100TX 200000 8 Yes Force-False Yes --- Output omitted --- 25 1000SX 20000 8 No Force-True Yes 26 1000SX 20000 8 No Force-True Yes 14 of 16
9. Conclusion Single-instance RSTP operation between the Avaya C363T-PWR Converged Switch, the Avaya G350 Media Gateway and HP ProCurve Switches is compatible and a fast convergence time (less than 5 seconds) can be achieved in case of link failure. Connectivity between all of the vendors products depicted using 802.1w Rapid Spanning Tree Protocol (RSTP) can be achieved by following the guidelines demonstrated in these Application Notes. 10. Additional References The following reference documents can be obtained online: From http://support.avaya.com: Avaya C360 Converged Switch User Guide Administrator s Guide for Avaya Communication Manager From http://www.hp.com/rnd/support HP Advanced Traffic Management Guide 15 of 16
Avaya and the Avaya Logo are trademarks of Avaya Inc. All trademarks identified by and are registered trademarks or trademarks, respectively, of Avaya Inc. All other trademarks are the property of their respective owners. The information provided in these Application Notes is subject to change without notice. The configurations, technical data, and recommendations provided in these Application Notes are believed to be accurate and dependable, but are presented without express or implied warranty. Users are responsible for their application of any products specified in these Application Notes. Please e-mail any questions or comments pertaining to these Application Notes along with the full title name and filename, located in the lower right corner, directly to the Avaya Solution & Interoperability Test Lab at interoplabnotes@list.avaya.com 16 of 16