The link sent by Dandy seems to be a very interesting presentation and you should find good information in it. The answer from Dandy implies response to the questions that you ask. I thought it might be helpful to provide explicit answers: No this is not normal, and yes it would appear that there was a problem.
Without more information it is hard to be sure of what the problem was, but here is what I believe we can say based on what you have posted so far.
- there are 2 BGP neighbor routers. One is at
192.168.10.1 and the other is at 192.168.30.1.
- your router stopped receiving keepalive messages from both of these neighbors. We do not have enough information at this point to know why the keepalives stopped but common reasons are that an interface went down somewhere in the data path to these neighbors, or there might have been a routing issue and the routes to these neighbors (or their routes to you) were withdrawn from some routing table somewhere in the data path to these neighbors, or there might have a temporary change in an access list that denied the BGP traffic.
- when the hold interval expired with no keepalive received your router terminated the neighbor relationship and sent a notification message to each neighbor that it was terminating the neighbor relationship.
- part of terminating the neighbor relationship is to tear down the TCP based session to the neighbors.
- your router continues to try to initiate a TCP based BGP session. and a few minutes later it was successful and the BGP neighbor relationship was restored.
The problem is solved. It's a hardware faulty. We change the WIC to another slot and the BGP is working fine now. Hard to believe that hardware faulty can prevent ONLY BGP keepalive from being sent while other packets flow freely.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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