3com 5500 User Manual

C

HAPTER

 14: MSTP C

ONFIGURATION

 G

UIDE

interface Ethernet1/0/8

stp disable

# 

3 Configuration on Switch C

#

stp instance 0 priority 8192

stp enable

#

interface Ethernet1/0/1

stp root-protection

#

interface Ethernet1/0/2

stp root-protection

#

interface Ethernet1/0/3

stp root-protection

#

interface Ethernet1/0/8

stp disable

# 

4 Configuration on Switch D

#

stp enable

#

interface Ethernet1/0/3

stp disable

interface Ethernet3/0/5

stp edged-port enable

stp bpdu-protection

# 

On a network comprised of devices of multiple vendors, 3Com switches cannot 
interoperate with switches that run proprietary spanning tree protocols in the 
same MSTP region, even if they are configured with the same MST region-related 
settings.

To address the problem, you can enable digest snooping on the ports connected 
to switches running proprietary spanning tree protocols.

The proprietary spanning tree protocols of some vendors provide port state 
transition mechanisms similar to RSTP. For a switch running such a proprietary 
protocol, its rapid port state transition mechanism may fail on the designation port 
when the switch is downlinked to an MSTP-enabled 3Com switch.

To address the problem, you can enable the rapid transition feature on the 
downstream 3Com switch.