3com 5500-ei pwr Reference Guide

 

1-18 

# Configure Ethernet 1/0/2 to Ethernet 1/0/4 to recognize and send MSTP BPDUs in dot1s format. 

<Sysname> system-view 

[Sysname] stp interface Ethernet 1/0/2 to Ethernet1/0/4 compliance dot1s 

z 

System view, Ethernet port view: 

stp config-digest-snooping 

undo stp config-digest-snooping 

z 

System view: 

stp interface interface-list config-digest-snooping 

undo stp interface interface-list config-digest-snooping 

System view, Ethernet port view 

interface-list: Ethernet port list. You can specify multiple Ethernet ports by providing this argument in the 

form of interface-list = { interface-type interface-number [ to interface-type interface-number ] } &<1-10>, 

where &<1-10> means that you can provide up to 10 port indexes/port index ranges for this argument. 

z 

Use the stp config-digest-snooping command to enable the digest snooping feature. Use the 

undo stp config-digest-snooping command to disable the digest snooping feature. Configured 

in system view, the setting takes effect globally; configured in interface view, the setting takes 

effect on the current port only. 

z 

Use the stp interface config-digest-snooping command in system view to enable the digest 

snooping feature on specific ports. Use the undo stp interface config-digest-snooping 

command in system view to disable the digest snooping feature on specific ports. 

The digest snooping feature is disabled by default. 

 

To enable the digest snooping feature successfully, you must first enable it on all the switch ports that 

connect to the other manufacturer’s switches adopting proprietary spanning tree protocols and then 

enable it globally. 

 

According to IEEE 802.1s, two interconnected switches can interwork with each other through MSTIs in 

an MST region only when the two switches have the same MST region-related configuration. With 

MSTP enabled, interconnected switches determine whether or not they are in the same MST region by 

checking the configuration IDs of the BPDUs between them. (A configuration ID contains information 

such as region ID and configuration digest.)