2 CHAPTER Introduction 10.1 Spanning Tree Concepts 10.2 Varieties of Spanning Tree Protocols 10.3 Spanning Tree Configuration 10.4 First-Hop Redundancy Protocols 10.5 Summary
3 CHAPTER 10: OBJECTIVES Describe the issues with implementing a redundant network. Describe IEEE 802.1D STP operation. Describe the different spanning tree varieties. Describe PVST+ operation in a switched LAN environment. Describe Rapid PVST+ operation in a switched LAN environment. Configure PVST+ in a switched LAN environment. Configure Rapid PVST+ in a switched LAN environment. Identify common STP configuration issues. Describe the purpose and operation of first hop redundancy protocols. Describe the different varieties of first hop redundancy protocols. Use Cisco IOS commands to verify HSRP and GLBP implementations.
4 10.1 SPANNING TREE CONCEPTS
5 PURPOSE OF SPANNING TREE REDUNDANCY AT OSI LAYERS 1 AND 2 Multiple cabled paths between switches: Provide physical redundancy in a switched network. Improves the reliability and availability of the network. Enables users to access network resources, despite path disruption.
6 PURPOSE OF SPANNING TREE ISSUES WITH LAYER 1 REDUNDANCY: MAC DATABASE INSTABILITY Ethernet frames do not have a time to live (TTL) attribute. Frames continue to propagate between switches endlessly, or until a link is disrupted and breaks the loop. Results in MAC database instability. Can occur due to broadcast frames forwarding. If there is more than one path for the frame to be forwarded out, an endless loop can result. When a loop occurs, it is possible for the MAC address table on a switch to constantly change with the updates from the broadcast frames, resulting in MAC database instability.
7 PURPOSE OF SPANNING TREE ISSUES WITH LAYER 1 REDUNDANCY: BROADCAST STORMS A broadcast storm occurs when there are so many broadcast frames caught in a Layer 2 loop that all available bandwidth is consumed. It is also known as denial of service A broadcast storm is inevitable on a looped network. As more devices send broadcasts over the network, more traffic is caught within the loop; thus consuming more resources. This eventually creates a broadcast storm that causes the network to fail.
8 PURPOSE OF SPANNING TREE ISSUES WITH LAYER 1 REDUNDANCY: BROADCAST STORMS
9 PURPOSE OF SPANNING TREE ISSUES WITH LAYER 1 REDUNDANCY: DUPLICATE UNICAST FRAMES Unicast frames sent onto a looped network can result in duplicate frames arriving at the destination device. Most upper layer protocols are not designed to recognize, or cope with, duplicate transmissions. Layer 2 LAN protocols, such as Ethernet, lack a mechanism to recognize and eliminate endlessly looping frames.
10 PURPOSE OF SPANNING TREE ISSUES WITH LAYER 1 REDUNDANCY: DUPLICATE UNICAST FRAMES
11 STP OPERATION SPANNING TREE ALGORITHM: INTRODUCTION STP ensures that there is only one logical path between all destinations on the network by intentionally blocking redundant paths that could cause a loop. A port is considered blocked when user data is prevented from entering or leaving that port. This does not include bridge protocol data unit (BPDU) frames that are used by STP to prevent loops. The physical paths still exist to provide redundancy, but these paths are disabled to prevent the loops from occurring. If the path is ever needed to compensate for a network cable or switch failure, STP recalculates the paths and unblocks the necessary ports to allow the redundant path to become active.
12 STP OPERATION SPANNING TREE ALGORITHM: INTRODUCTION
13 STP OPERATION SPANNING TREE ALGORITHM: INTRODUCTION
14 STP OPERATION SPANNING TREE ALGORITHM: INTRODUCTION
15 STP OPERATION SPANNING TREE ALGORITHM: PORT ROLES
16 STP OPERATION SPANNING TREE ALGORITHM: ROOT BRIDGE
17 STP OPERATION SPANNING TREE ALGORITHM: PATH COST
18 STP OPERATION 802.1D BPDU FRAME FORMAT
19 STP OPERATION BPDU PROPAGATION AND PROCESS
20 STP OPERATION BPDU PROPAGATION AND PROCESS
21 STP OPERATION EXTENDED SYSTEM ID STP was enhanced to include support for VLANs, requiring the VLAN ID to be included in the BPDU frame through the use of the extended system ID
22 STP OPERATION EXTENDED SYSTEM ID In the example, the priority of all the switches is The value is based on the default priority and the VLAN 1 assignment associated with each switch ( ).
23 10.2 VARIETIES OF SPANNING TREE PROTOCOLS
24 OVERVIEW LIST OF SPANNING TREE PROTOCOLS STP or IEEE 802.1D-1998 PVST+ IEEE 802.1D-2004 Rapid Spanning Tree Protocol (RSTP) or IEEE 802.1w Rapid PVST+ Multiple Spanning Tree Protocol (MSTP) or IEEE 802.1s
25 STP OVERVIEW CHARACTERISTICS OF THE SPANNING TREE PROTOCOLS
26 PVST+ OVERVIEW OF PVST+ Networks running PVST+ have these characteristics: A network can run an independent IEEE 802.1D STP instance for each VLAN in the network. Optimum load balancing can result. One spanning-tree instance for each VLAN maintained can mean a considerable waste of CPU cycles for all the switches in the network. In addition to the bandwidth that is used for each instance to send its own BPDU.
27 PVST+ OVERVIEW OF PVST+
28 PVST+ PORT STATES AND PVST+ OPERATION STP introduces the five port states:
29 PVST+ EXTENDED SYSTEM ID AND PVST+ OPERATION In a PVST+ environment, the extended switch ID ensures each switch has a unique BID for each VLAN. For example, the VLAN 2 default BID would be 32770; priority 32768, plus the extended system ID of 2.
30 RAPID PVST+ OVERVIEW OF RAPID PVST+ RSTP is the preferred protocol for preventing Layer 2 loops in a switched network environment. With Rapid PVST+, an independent instance of RSTP runs for each VLAN. RSTP supports a new port type: an alternate port in discarding state. There are no blocking ports. RSTP defines port states as discarding, learning, or forwarding. RSTP (802.1w) supersedes STP (802.1D) while retaining backward compatibility RSTP keeps the same BPDU format as IEEE 802.1D, except that the version field is set to 2 to indicate RSTP, and the flags field uses all 8 bits.
31 RAPID PVST+ OVERVIEW OF RAPID PVST+
32 RAPID PVST+ RSTP BPDU
33 RAPID PVST+ EDGE PORTS
34 RAPID PVST+ LINK TYPES The link type can determine whether the port can immediately transition to forwarding state. Edge port connections and point-topoint connections are candidates for rapid transition to forwarding state.
37 PVST+ CONFIGURATION CONFIGURING AND VERIFYING THE BRIDGE ID
38 PVST+ CONFIGURATION CONFIGURING AND VERIFYING THE BRIDGE ID
39 When a switch port is configured with PortFast that port transitions from blocking to forwarding state immediately. PVST+ CONFIGURATION PORTFAST AND BPDU GUARD BPDU guard puts the port in an error-disabled state on receipt of a BPDU.
40 PVST+ CONFIGURATION PVST+ LOAD BALANCING
41 PVST+ CONFIGURATION PVST+ LOAD BALANCING Another method to specify the root bridge is to set the spanning tree priority on each switch to the lowest value so that the switch is selected as the primary bridge for its associated VLAN.
42 PVST+ CONFIGURATION PVST+ LOAD BALANCING Display and verify spanning tree configuration details.
43 PVST+ CONFIGURATION PVST+ LOAD BALANCING
44 Rapid PVST+ is the Cisco implementation of RSTP. It supports RSTP on a per- VLAN basis. RAPID PVST+ CONFIGURATION SPANNING TREE MODE
45 STP CONFIGURATION ISSUES ANALYZING THE STP TOPOLOGY
46 STP CONFIGURATION ISSUES EXPECTED TOPOLOGY VERSUS ACTUAL TOPOLOGY
47 STP CONFIGURATION ISSUES OVERVIEW OF SPANNING TREE STATUS
48 STP CONFIGURATION ISSUES SPANNING-TREE FAILURE CONSEQUENCES STP erroneously moves one or more ports into the forwarding state. Any frame that is flooded by a switch enters the loop.
49 STP CONFIGURATION ISSUES REPAIRING A SPANNING TREE PROBLEM One way to correct spanning-tree failure is to manually remove redundant links in the switched network, either physically or through configuration, until all loops are eliminated from the topology. Before restoring the redundant links, determine and correct the cause of the spanning-tree failure. Carefully monitor the network to ensure that the problem is fixed.
50 10.4 FIRST-HOP REDUNDANCY PROTOCOLS
51 If the default gateway cannot be reached, the local device is unable to send packets off the local network segment. Even if a redundant router exists that could serve as a default gateway for that segment, there is no dynamic method by which these devices can determine the address of a new default gateway. CONCEPT OF FIRST-HOP REDUNDANCY PROTOCOLS DEFAULT GATEWAY LIMITATIONS
52 CONCEPT OF FIRST-HOP REDUNDANCY PROTOCOLS ROUTER REDUNDANCY Multiple routers are configured to work together to present the illusion of a single router to the hosts on the LAN. The ability of a network to dynamically recover from the failure of a device acting as a default gateway is known as first-hop redundancy.
53 CONCEPT OF FIRST-HOP REDUNDANCY PROTOCOLS STEPS FOR ROUTER FAILOVER
54 VARIETIES OF FIRST-HOP REDUNDANCY PROTOCOLS FIRST-HOP REDUNDANCY PROTOCOLS Hot Standby Router Protocol (HSRP) HSRP for IPv6 Virtual Router Redundancy Protocol version 2 (VRRPv2) VRRPv3 Gateway Load Balancing Protocol (GLBP) GLBP for IPv6 ICMP Router Discovery Protocol (IRDP)
55 VARIETIES OF FIRST-HOP REDUNDANCY PROTOCOLS FIRST-HOP REDUNDANCY PROTOCOLS
56 FHRP VERIFICATION HSRP VERIFICATION
57 FHRP VERIFICATION GLBP VERIFICATION Gateway Load Balancing Protocol (GLBP) is a Cisco proprietary solution to allow automatic selection and simultaneous use of multiple available gateways in addition to automatic failover between those gateways.
58 10.5 SUMMARY
59 CHAPTER 10: SUMMARY IEEE 802.1D is implemented on Cisco switches on a per-vlan basis in the form of PVST+. This is the default configuration on Cisco switches. RSTP, can be implemented on Cisco switches on a per-vlan basis in the form of Rapid PVST+. With PVST+ and Rapid PVST+, root bridges can be configured proactively to enable spanning tree load balancing. First hop redundancy protocols, such as HSRP, VRRP, and GLBP provide alternate default gateways for hosts in the switched environment.
60 TERIMA KASIH Thank you very much for your kind attention
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