High Bpdus (MRecords) sent 14204303, received 44682

[athambi]

I am running MST01 on my network.all the GIG ports are getting connected to leaf switches like 3560 and 4948.when I do the command

"show spanning-tree mst 1 detail" I see that BPDU received on port 3/44 is very high than any other ports .Iam doign this command on the root bridge .

what could be cuasing these BPDU recieve to go high on the root bridge

[Giuseppe Larosa]

Hello Ajai,

it looks like out that port there is a device that doesn't agree on the root bridge id.

verify the MST region config on the device because if a parameter is mismatching both devices think to be in different regions

OR the device is root bridge for one MST instance

Hope to help

Giuseppe

[athambi]

this is the config of MSt on root

spanning-tree mode mst

no spanning-tree optimize bpdu transmission

spanning-tree extend system-id

spanning-tree vlan 1-999 priority 12288

!

spanning-tree mst configuration

instance 1 vlan 1-999

!

spanning-tree mst 0-1 priority 8192

The below is the confg for the leaf switch

spanning-tree mode mst

no spanning-tree optimize bpdu transmission

spanning-tree extend system-id

spanning-tree vlan 1-999 priority 61440

!

spanning-tree mst configuration

instance 1 vlan 1-999

!

spanning-tree mst 0-1 priority 61440

[Giuseppe Larosa]

Hello Ajai,

MST configuration includes other parameters that I don't see here.

the region name and the revision number for example have to match.

see

http://www.cisco.com/en/US/docs/switches/lan/catalyst6500/ios/12.2SX/configuration/guide/spantree.html

you can also have a look at access switch log with sh log and see if there are STP events

Hope to help

Giuseppe