10-21-2009 01:23 AM - edited 03-04-2019 06:26 AM
Hello all,
I have three routers ( one Juniper M10i and two Cisco VXRs) configured with full mesh i-BGP, one of the VXR BGP session with M10i is disconnecting frequently due to Error: hold time expired.
The log server shows:
Oct 21 13:56:37.471 NST: BGP: Import timer expired. Walking from 1 to 1
Oct 21 13:56:52.496 NST: BGP: Import timer expired. Walking from 1 to 1
Oct 21 13:57:07.520 NST: BGP: Import timer expired. Walking from 1 to 1
Oct 21 14:17:18.057 NST: %BGP-5-ADJCHANGE: neighbor 116.66.192.1 Down BGP Notification sent
Oct 21 14:17:18.057 NST: %BGP-3-NOTIFICATION: sent to neighbor 116.66.192.1 4/0 (hold time expired) 0 bytes
Oct 21 14:17:46.903 NST: %BGP-5-ADJCHANGE: neighbor 116.66.192.1 Up
Oct 21 14:33:12.327 NST: %SYS-5-CONFIG_I: Configured from console by ramesh on vty0 (202.63.244.48)
Oct 21 14:34:49.548 NST: %BGP-5-ADJCHANGE: neighbor 116.66.192.1 Down BGP Notification sent
Oct 21 14:34:49.548 NST: %BGP-3-NOTIFICATION: sent to neighbor 116.66.192.1 4/0 (hold time expired) 0 bytes
Oct 21 14:35:17.681 NST: %BGP-5-ADJCHANGE: neighbor 116.66.192.1 Up
I have configured OSPF as IGP, network in broadcast, peering done with loopback address and also the update source is loopback address.
Help will be appreciate.
Thank you,
Uttam
10-21-2009 03:21 AM
have you changed any timers setting?
The Cisco IOS default keepalive timer is 60 seconds and the default HoldTime is 180 seconds, while Juniper routers use a default keepalive of 30 seconds and a default HoldTime of 90 seconds. Juniper routers uses a default of 30/90 seconds - Accordingly if a Cisco and a Juniper routers are peering they will agree to use 30/90 seconds. By default you shouldnt have to change any timers!!
unless you are experience layer 1 issues!!
10-21-2009 05:02 AM
Hi Franco,
Thanks for the response. I haven't configured hello and dead interval on router, it is agree to use default 30/90 seconds as you have told.
But one question, does it affect by bandwidth limit with 8K between iBGP peers? Cause it couldn't increment the updates and the connections is breaking ?
Also both routers are configured with MTU path discovery mode.
Thank you,
Uttam
10-21-2009 05:28 AM
i beleive if there is congestion on the network then that could potencially break bgp sessions, causing dropping of BGP messages!
10-22-2009 02:51 AM
Hi,
Last time I have upgraded the BW to 128K till then there is no session interruption between the peers.
thanks for your help
Thank you,
Uttam
10-22-2009 02:53 AM
you are welcome.
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