Actually when I first saw the response of "routes renewing constantly" I took it to mean that he was recieving large numbers of updates not have major failure events locally. If my assumption is correct you would see MsgRcvd MsgSent TblVer InQ OutQ all incrementing quickly as seen through sh ip bgp sum. This could be due to: -Recursive route lookups for Nexthop where the NH is another BGP derived route causing it to come/go while creating new FIB. It's normally good design practice to have the BGP NH reachable via an IGP.
OR -BGP occilations due to using MEDs in a confed or RR configuration. draft-ietf-idr-route-oscillation-00.txt has a good description. Depending upon the number of updates use "debug ip bgp updates " with an ACL scoped enough to keep from killing your router with logging. That's the tough part hopefully the number of updates are small enough you can safely look at all updates for a short period of time. MADMAN wrote: > > If all your routes are floppin then we need to know why. Do you have > suffcient > memory, i.e 128M for full routing. Is the peer stable, the WAN, why did it > reset? See last line in this output. > > Dave > > C7507MIX#sh ip bgp nei > BGP neighbor is 99.1.1.1, remote AS 15, external link > BGP version 4, remote router ID 99.1.1.1 > BGP state = Established, up for 1w5d > Last read 00:00:32, hold time is 180, keepalive interval is 60 seconds > Neighbor capabilities: > Route refresh: advertised and received(new) > Address family IPv4 Unicast: advertised and received > IPv4 MPLS Label capability: > Received 21895 messages, 0 notifications, 0 in queue > Sent 22001 messages, 0 notifications, 0 in queue > Default minimum time between advertisement runs is 30 seconds > > For address family: IPv4 Unicast > BGP table version 145, neighbor version 145 > Index 1, Offset 0, Mask 0x2 > Route refresh request: received 0, sent 0 > 0 accepted prefixes consume 0 bytes > Prefix advertised 91, suppressed 2, withdrawn 52 > Number of NLRIs in the update sent: max 37, min 0 > > Connections established 2; dropped 1 > Last reset 1w5d, due to Peer closed the session > > [EMAIL PROTECTED] wrote: > > > Routes renewing constantly. > > > > > > MADMAN > > prise.com> cc: > [EMAIL PROTECTED] > > Subject: Re: BGP Help > [7:29650] > > 12/19/2001 > > 02:54 PM > > > > > > > > Describe what you mean by flapping. > > > > Dave > > > > "[EMAIL PROTECTED]" wrote: > > Greetings all, > > > > I was wondering if you guys can help out with this problem. We're > > connected to both Sprint and UUnet and receiving full routes. All > > routers are peering with each other. My problem is with both RTRA > > and > > RTRB, they're flapping constantly, RTRC and RTRD are very stable. > > Is > > there a knowing cause am missing here? any suggestions would be > > great. > > > > Thanks.....................Nabil > > > > RTR A- - - - - - - - - - - - - - - - - - - - RTRB > > | | > > | | > > | | > > | | > > RTRC RTRD > > Sprint UUNET > > [EMAIL PROTECTED] > > > > -- > > David Madland > > CCIE# 2016 > > Senior Network Engineer > > Qwest Communications > > 612-664-3367 > > -- > David Madland > CCIE# 2016 > Senior Network Engineer > Qwest Communications > 612-664-3367 Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=29713&t=29650 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
