Avaya P580 User Manual download pdf (Page 145)

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Avaya P550R, P580, P880, and P882 Multiservice Switch User Guide, Version v5.3.1 4-15

Using VLANs, Spanning Tree, Hunt Groups, and VTP Snooping

Problems with

Single Spanning

Tree Instance

IEEE 802.1D

Loss of Connectivity - There is a the potential for the loss of

connectivity of a VLAN when using standard Spanning Tree (IEEE

802.1D). Specifically when their is a loop in one VLAN, but not

another, that share the same physical ports. In Figure 4-8, there is a

loop in the physical connections between the two switches. This

loop is in VLAN A, but not in VLAN B. When running single

Spanning Tree, it is possible that in order to break the loop in VLAN

A that a port that is blocked causes a loss of connectivity in VLAN B.

Running per-VLAN Spanning Tree would correct the problem.

* Note: 802.1D configurations are typically used when only one

VLAN is configured.

Figure 4-6. Problems with 802.1D Spanning Tree

Managing the Spanning Tree Protocol

* Note: You should have a good understanding of the Spanning

Tree Protocol before attempting to setup management

parameters. Because of the number of “bridges” present

in a switched networking environment, Spanning Tree

Protocol structures can become extremely complex. For

more information, refer to "Spanning Tree Modes" in

Chapter 1.

You can manage the Spanning Tree Protocol using either the Web

Agent or the CLI.

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