Forwarding Protocols • OSPF link change causes all BGP sessions to drop

Good morning everyone.

I'm experiencing a ospf issue i have never seen before.

We have a 1072 that was running a fairly old ROS running solid for the last past years.

There are 3 10G links to the datacentre and I use OSPF with BFD to peer to the loopback of the core router in the DC.

Now the issue I am facing is, if any of the 3 links to the DC goes down for what ever reason and the ospf link state changes All the BGP sessions are dropped even on interfaces not running OSPF.

It seems like what ever is happening is causing OSPF and BGP to reset completely resulting in all BGP sessions to be dropped.

I have updated the box and its firmware to 6.49.10 and the problem still persists.

The log is showing a ospf issue for all the interfaces that is running ospf " Discarding packet: no neighbor with this source address" BGP debug is impossible to read since it fills the log every time it happens.

Also the interfaces going to the DC is setup as ospf Point to Point with BFD enabled on all of them. No firewall, NAT or connection tracking on this device

Any suggestions on what may be going on here?

Statistics: Posted by p3rad0x — Thu Feb 15, 2024 8:00 am

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