spanning-tree extend system-id

简介:

spanning-tree extend system-id

在交换机上启用extended-system ID 特征使其支持 1024 MAC 地址, 在全局模式下使用 spanning-tree extend system-id命令.禁用时前面加 no。

spanning-tree extend system-id

no spanning-tree extend system-id

命令用法

在不提供 1024 MAC 地址的交换机上使用.

命令历史

Release
Modification

12.2(14)SX

Support for this command was introduced on the Supervisor Engine 720.

12.2(17d)SXB

Support for this command on the Supervisor Engine 2 was extended to Release 12.2(17d)SXB.

12.2(33)SRA

This command was integrated into Cisco IOS Release 12.2(33)SRA.

 

命令用法

6500系列交换机支持 64 - 1024 MAC 地址, Catalyst 6500 系列交换机使用 64 MAC 地址, STP 使用 extended-system ID 和一个 MAC 地址确保bridge ID在每个VLAN上都是唯一的。

不能在6500系列交换机上禁用 extended-system ID 是交换机支持 64 MAC 地址

Enabling or disabling the extended-system ID updates the bridge IDs of all active Spanning Tree Protocol (STP) instances, which might change the spanning-tree topology.

E 命令配置


 

Router(config)# spanning-tree extend system-id  

 
CS4507R(config)# spanning-tree extend ?   system-id  Extend system-id into priority portion of the bridge id (PVST &              Rapid PVST only)


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