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OSPF with spanning tree

carl-voicenet
Level 1
Level 1

Hi there Merry Xmas..

We have two 3750 core switches and one mpls switch.

Core Switch B connects to switch A via port channel. The Mpls switch connects directly to switch A.

Switch A is hsrp active for all vlans.

We would like to connect the MPLS switch to Core switch B as well and use that for redundancy.

Now i understand also that spanning tree will be an issue with 2 connections from the mpls switch.

I've setup ospf on all devices and core switch A is the spanning tree root.

The issue though is that traffic across the MPLS network seems to work fine to start with then after about 20mins it stops routing across. I then have to unplug the MPLS connection to switch B and then reset the connection to switch A to fix.

Any thoughts?

Is this best method to obtain redundancy for this?

OSPF on just core switch A works fine but once adding core switch B into ospf we start to see issues.

Basic Diagram attached..

1 Accepted Solution