Step 19 hello-time seconds
Example:
RP/0/RSP0/CPU0:router(config-mstp-if)# hello-time 1
Sets the port hello time in seconds.
Allowed values are 1 and 2.
Step 20 portfast [ bpdu-guard ]
Example:
RP/0/RSP0/CPU0:router(config-mstp-if)# portfast
RP/0/RSP0/CPU0:router(config-mstp-if)# portfast bpduguard
Enables PortFast on the port, and optionally enables BPDU guard.
Step 21 guard root
Example:
RP/0/RSP0/CPU0:router(config-mstp-if)# guard root
Enables RootGuard on the port.
Step 22 guard topology-change
Example:
RP/0/RSP0/CPU0:router(config-mstp-if)# guard topology-change
Enables TopologyChangeGuard on the port.
Repeat steps 14 to 22 for each interface.
Note
Step 23 Use the commit or end command.
commit - Saves the configuration changes and remains within the configuration session.
end - Prompts user to take one of these actions:
• Yes - Saves configuration changes and exits the configuration session.
• No - Exits the configuration session without committing the configuration changes.
• Cancel - Remains in the configuration mode, without committing the configuration changes.
Verifying MSTP
These show commands allow you to verify the operation of MSTP:
• show spanning-tree mst mst-name
• show spanning-tree mst mst-name interface interface-name
L2VPN and Ethernet Services Configuration Guide for Cisco ASR 9000 Series Routers, IOS XR Release 6.3.x
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Implementing Multiple Spanning Tree Protocol
Verifying MSTP
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