Access Node effecting Other Building Nodes

[kumarsantosh]

We have one access ring having 6 Access Nodes(3750) and 6 Building nodes(2950) connected to each Access Node.Find ring connectivity diagram in attachment.

Whenever Access Node 4 is become unreachable (i.e Due to power problem) Access Node 3 & 5's Building Switches got fluctuated twice for 10 to 15 seconds (Once when access Node 4 is down and second time when access node 4 is up). We've checked logging also on both Building Switches but not found any info. for this problem.

Also, We've checked all the configuration on all switches (AS/BS) and found all configuration is ok on all switches.

Pls help....

[Josef Oduwo]

This probaly has something to do with Spanning-Tree convergence.

What do you mean by "Fluctuated"? Do you see complete downtime on the building nodes?

Do you have any trunking going on between your building and access nodes? What settings are your building-access uplinks on?

May we see a sample of your configs for a building as well as access node?

Cheers,

Josef.

PS - I think the convention for naming "Building" (or Distribution) and "Access" functions may be the reverse of what you have in your diagram.

[kumarsantosh]

Whenever any of the 3750 is rebooted from the ring, 2950 of adjecent 3750 are getting affected and we are getting 5-7 ping breaks when AS goes down and comes up.

Each 3750 is having collocated 2950 only.

Find the attached configuration of both switches.

[kumarsantosh]

Hi one more thing i forgotten to add i am not able to see any downtime in 2950 log.

[Georg Pauwen]

Hello,

the problem, based on your drawing, sounds like it might be related to spanning tree convergence issues. Can you check which switch is the root for your VLAN(s) ? Does every building have its own VLAN ?

Regards,

GP

[kumarsantosh]

Root switch is Cisco7606 for all switches.Yes,Every building have its own VLAN.