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troubleshooting BGP IDLE/Active state without debug command

amardram123
Beginner
Beginner

Hi,

Need help to troubleshoot BGP IDLE/Active state in my company network.

Our monitoring team has given me the list of BGP Active/idle neighbor details, almost 100 neighbor are either in active or idle state and asked to troubleshoot. Its a very big Banking network and i am not allowed to make any changes till i prepare complete troiubleshooting/configuration steps.

could any one share me any solid troublshooting steps/doc for BGP Idle or Active states.

Regards:
amar

6 Replies 6

Kishore Chennupati
Rising star
Rising star

Amar,

Maybe this wil help

http://meetings.ripe.net/ripe-44/presentations/ripe44-eof-bgp.pdf

well in a nut shell you might want to chek the following

.1. ip reachability

2 TCP port 179 allowed across the peers

3.  MTU stuff

  4. multihop and peer TTL configurations

5. BGP authentication

  6. incorrect AS

HTH

Ksihore

Hi Kishore Chennupati,

I read this presentation http://meetings.ripe.net/ripe-44/presentations/ripe44-eof-bgp.pdf which helped me a lot and can you post same slides for EIGRP troubleshooting also.

Thanks in advance

Hi, Do you have a similar guide for OSPF and MPLS... Good Document for BGP.

 

Thanks in advanced

 

Regards

Thanks a lot, it's very helpful

 

Rick Morris
Frequent Contributor
Frequent Contributor

There are several things to check.

I am assuming you can perform show commands and basic ping?

1.  Show IP BGP summary

--This command will give you some basic details of the neighbors.

--You can use this to verify the output you received for the idle and active states.

2.  ping

--If you cannot ping the neighbor then the BGP session will not come up

3.  Show run | b router bgp

--Use this to verify the remote-as

--Also you can verify if the connection has ebgp multihop count configured correctly

--can check the config to see if a password is set

Once all of this is verified you can then check with the ISP to verify what they see.  None of this involves any changes in config or debugs.

rettuc_ccnp
Beginner
Beginner

can you paste just the BGP configs. of two neighbors that are stuck idle/active (please note if they are not directly connected and if not how many router hops to the neighbor) and whether or not you can ping each of them from the other.

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