07-11-2007 11:17 PM - edited 03-03-2019 05:49 PM
Guys just a quick question........when we do soft reset an dwhen we do hard rest....lik ein have som escenario.....if we advertise a new network then we have to do reset or whenever we or add prefix list we will do resets.....the first question is when we do reset in bgp an dthe second is when we do hard and when we do soft.....really cant get my head around it
07-11-2007 11:28 PM
Hi
From the BGP FAQ
=============================================
Q. When and how should I reset a BGP session?
A. Clear a BGP session when you change the inbound/outbound policy for this session. Issue the clear ip bgp x.x.x.x soft out command to clear a BGP session in order to bring outbound policy changes into effect. Issue the clear ip bgp x.x.x.x command in order to clear a BGP session to bring inbound policy changes into effect. If the neighbor has the soft reconfiguration capability, you can issue the clear ip bgp x.x.x.x soft in command.
Note: With Cisco IOS Software Release 12.0 and later, a new BGP Soft Reset Enhancement feature is introduced. Refer to BGP Soft Reset Enhancement for more information.
=============================================
So if you make a change at your end you can do a soft reset.
If a change is made at the other end you may need to do a full reset which obviously means an interruption in service or you may be able to do a soft in reset depending on the neighbour capabilities.
HTH
Jon
06-02-2008 07:32 AM
Hi Jon,
I realise this post is old but I'll try any way.
I am having difficulty finding out the capabilities of a remote, external BGP router. What part of the output of the following confirms both routers are capable of route refresh?
Thanks,
Mark
router#sh ip bgp neighbors AAA.BBB.CCC.DDD
BGP neighbor is AAA.BBB.CCC.DDD+1, remote AS 1, external link
BGP version 4, remote router ID AAA.BBB.CCC.DDD
BGP state = Established, up for 9w2d
Last read 00:00:10, hold time is 180, keepalive interval is 60 seconds
Neighbor capabilities:
Route refresh: advertised and received(old & new)
Address family BGP IPv4: advertised and received
Message statistics:
InQ depth is 0
OutQ depth is 0
Sent Rcvd
Opens: 47 44
Notifications: 23 21
Updates: 0 15611157
Keepalives: 411956 411852
Route Refresh: 0 0
Total: 412072 16023101
Default minimum time between advertisement runs is 30 seconds
For address family: BGP IPv4
<...output ommitted...>
06-02-2008 07:40 AM
"Route refresh: advertised and received(old & new)"
The above line tells you that this router and the peer router can both support route refresh.
Jon
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