From: Eric Hoffman (skeetin@hotmail.com)
Date: Fri Jan 14 2005 - 15:52:51 GMT-3
Hi,
BGP will always send keepalives to it's neighbor, in order to establish a
relationship. I wouldn't go tweaking the bgp timers for this solution...
unless there is a requirement to do so.
Couple of different ways we can go about this, so that the BGP connection
doesn't keep the isdn line up. One way that jumps out at me, is denying the
bgp updates (tcp 179) in the interesting traffic list, for outbound tcp 179
and inbound tcp 179.
This should prevent the bgp keepalives from being interesting traffic, and
then the line won't stay up.
Hope this helps,
Eric
13843
>Hi guys,
>
>I'm trying to prevent bgp from sending keepalives across an isdn link.
>
>I configured the following on each side:
>
>router bgp 200
> bgp router-id 150.1.4.4
> bgp log-neighbor-changes
> neighbor 130.1.124.1 remote-as 100
> neighbor 130.1.234.3 remote-as 200
> neighbor 150.1.5.5 remote-as 200
> neighbor 150.1.5.5 update-source Loopback0
> neighbor 150.1.5.5 timers 0 0 <-- Stop
>keepalives
>
>Yet, BGP is still sending keepalives across the link. See debug output
>below.
>Why is that?
>
>Is there anything I can do to stop these keepalives?
>
>R4's debug
>*Mar 9 16:47:32.188: IP: s=150.1.5.5 (BRI0/0), d=150.1.4.4, len 40, rcvd 4
>*Mar 9 16:47:32.188: TCP src=179, dst=11263, seq=264761101,
>ack=1280955899,
> win=16270 ACK
>*Mar 9 16:47:32.396: %LINEPROTO-5-UPDOWN: Line protocol on Interface
>BRI0/0:1,
>changed state to up
>*Mar 9 16:47:37.320: %ISDN-6-CONNECT: Interface BRI0/0:1 is now connected
>to
>22
>21 ROUTER5
>*Mar 9 16:47:44.560: IP: s=150.1.5.5 (BRI0/0), d=150.1.4.4, len 59, rcvd 4
>*Mar 9 16:47:44.560: TCP src=179, dst=11263, seq=264761082,
>ack=1280955899,
> win=16270 ACK PSH
>*Mar 9 16:47:44.764: IP: tableid=0, s=150.1.4.4 (local), d=150.1.5.5
>(BRI0/0),
>routed via RIB
>
>R5's debug
>*Mar 7 03:52:49.763: IP: tableid=0, s=150.1.5.5 (local), d=150.1.4.4
>(BRI0/0),
>routed via RIB
>*Mar 7 03:52:49.979: IP: tableid=0, s=150.1.4.4 (BRI0/0), d=150.1.5.5
>(Loopback
>0), routed via RIB
>*Mar 7 03:52:49.979: IP: s=150.1.4.4 (BRI0/0), d=150.1.5.5, len 40, rcvd 4
>*Mar 7 03:52:49.979: TCP src=11263, dst=179, seq=1280955918,
>ack=264761120,
> win=16251 ACK
>Rack1R5#
>
>
>TIA, Tim
>
>_______________________________________________________________________
>Subscription information may be found at:
>http://www.groupstudy.com/list/CCIELab.html
This archive was generated by hypermail 2.1.4 : Wed Feb 02 2005 - 22:10:22 GMT-3