01-28-2016 02:06 PM - edited 03-05-2019 03:13 AM
Hello Community,
We got one notification from our monitoring tool that BGP peer is down. Immediately I jumped in the problem and captured some logs. Where "show logging" command show BGP Neighbor went down few minutes back, though "show ip bgp summary" shows it's down since 1 week and 1 day. How can it be possible ??
Jan 29 02:32:51.204: %BGP_SESSION-5-ADJCHANGE: neighbor 94.102.1XX.XXX IPv4 Unicast topology base removed from session NSF peer closed the session
Jan 29 02:32:51.204: %BGP-5-NBR_RESET: Neighbor 94.102.1XX.XXX reset (NSF peer closed the session)
Jan 29 02:32:51.204: %BGP-5-ADJCHANGE: neighbor 94.102.1XX.XXX Down NSF peer closed the session
UDVCGR01#
UDVCGR01#
UDVCGR01#show ip bgp su | i 94.102.1XX.XXX
94.102.1XX.XXX 4 77XX 0 0 1 0 0 1w1d Active
UDVCGR01#
UDVCGR01#show clock
03:12:37.394 IST Fri Jan 29 2016
UDVCGR01#
UDVCGR01#show ver | i image
System image file is "bootflash:asr1000rp2-adventerprisek9.03.13.02.S.154-3.S2-ext.bi"
UDVCGR01#
Automatically Neighbor came up after 40+ minutes. Please share some info.
We're checking for RFO with provider.
01-28-2016 02:14 PM
It says the peer closed the session, so I would be waiting for an answer to come back from them.
01-28-2016 03:11 PM
[@p.dath]
That's correct buddy, but my question was, how come BGP neighbour-ship is showing it's down since more than a week ?? though it's went down few minutes ago ?
//
Gaurav
01-28-2016 03:19 PM
I'm not sure. I think what it is saying is how long it has been (or rather was) up. Not how long it has been down.
01-28-2016 03:22 PM
Ok, No worries. But have you ever seen this kind of situation ?
01-28-2016 03:27 PM
With BGP neighbours going down? Sure. People have circuit issues, router issues, software issues, but 90% of the time - human issues.
01-28-2016 03:30 PM
No No. Sorry I didn't make it clear.
What I meant was, situation like BGP just went down (say 5-10 minutes back as per logs in `show logging` command but it's shows that particular neighbor is down since weeks in `show ip bgp neighbor` command. though it was up 15 minutes ago.
01-28-2016 03:32 PM
I'm not sure sorry. If the router has the correct time on it, I would trust the logged messages over the output of the BGP neighbour summary.
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