From: Larry Cain (l_u_cain@hotmail.com)
Date: Mon Aug 18 2003 - 18:04:27 GMT-3
Hi John
Already done, took it out of the configs to make them shorter - sorry.
Also have put next-hop-self in as well to all neighbours.
Restarted all bgp processes.
Have tried this with similar topologies and different routing protocols with
no success.
It seems to be a problem with redistributing, but WHERE???!!
Any ideas, comments much appreciated.
Larry
>From: "John Matijevic" <matijevi@bellsouth.net>
>To: "Larry Cain" <l_u_cain@hotmail.com>,<ccielab@groupstudy.com>
>Subject: Re: BGP Flapping routes
>Date: Mon, 18 Aug 2003 15:32:25 -0400
>
>Hello Larry,
>This looks like a tricky issue, lets start by adding the following to your
>BGP configs on all routers,
>neighbor ip-address update-source lo0
>restart your bgp process,
>and post results.
>Sincerely,
>Matijevic
>----- Original Message -----
>From: "Larry Cain" <l_u_cain@hotmail.com>
>To: <ccielab@groupstudy.com>
>Cc: <matijevi@bellsouth.net>
>Sent: Monday, August 18, 2003 2:44 PM
>Subject: Re: BGP Flapping routes
>
>
> > Hi John
> >
> > Here is info you asked for.
> > Hope it helps.
> > 2 versions of routing and bgp tables.
> > First is with the tables with all info including BGP in them. The second
>is
> > without the BGP routes.
> > You will notice that certain routes are either learnt by BGP or the IGP,
>or
> > disappear all together.
> > the routes will then reappear or cahnged to a learnt BGP route.
> > This happens every 60s, regular as clockwork - well as regualar as Cisco
> > routers can get.
> > The top bgp table goes with the top routing table.
> >
> > Many thanks for your help
> >
> > Larry
> >
> > r1#sh ip ro
> > C 1.1.1.0 is directly connected, Loopback0
> > O 2.2.2.0 [110/65] via 10.1.2.2, 00:26:40, Serial0
> > B 3.3.3.0 [200/0] via 2.2.2.2, 00:00:13
> > O E2 10.1.3.0 [110/5] via 10.1.2.2, 00:26:40, Serial0
> > C 10.1.2.0 is directly connected, Serial0
> > C 10.1.1.0 is directly connected, Ethernet0
> > O E2 10.1.4.0 [110/5] via 10.1.2.2, 00:26:40, Serial0
> >
> > C 1.1.1.0 is directly connected, Loopback0
> > O 2.2.2.0 [110/65] via 10.1.2.2, 00:38:19, Serial0
> > O E2 3.3.3.0 [110/5] via 10.1.2.2, 00:00:52, Serial0
> > O E2 10.1.3.0 [110/5] via 10.1.2.2, 00:38:19, Serial0
> > C 10.1.2.0 is directly connected, Serial0
> > C 10.1.1.0 is directly connected, Ethernet0
> > O E2 10.1.4.0 [110/5] via 10.1.2.2, 00:38:19, Serial0
> >
> > r2#sh ip ro
> > B 1.1.1.0/24 [200/0] via 1.1.1.1, 00:12:04
> > C 2.2.2.0 is directly connected, Loopback0
> > B 3.3.3.0 [20/0] via 3.3.3.3, 00:00:05
> > C 10.1.3.0 is directly connected, Serial1
> > C 10.1.2.0 is directly connected, Serial0
> > O 10.1.1.0 [110/51] via 10.1.2.1, 00:22:32, Serial0
> > D 10.1.4.0 [90/307200] via 10.1.3.3, 00:33:33, Serial1
> >
> > B 1.1.1.0/24 [200/0] via 1.1.1.1, 00:11:16
> > C 2.2.2.0 is directly connected, Loopback0
> > D 3.3.3.0 [90/409600] via 10.1.3.3, 00:00:16, Serial1
> > C 10.1.3.0 is directly connected, Serial1
> > C 10.1.2.0 is directly connected, Serial0
> > O 10.1.1.0 [110/51] via 10.1.2.1, 00:21:43, Serial0
> > D 10.1.4.0 [90/307200] via 10.1.3.3, 00:32:45, Serial1
> >
> > R3#sh ip ro
> > B 1.1.1.0/24 [20/0] via 2.2.2.2, 00:00:26
> > B 2.2.2.0 [20/0] via 2.2.2.2, 00:00:27
> > C 3.3.3.0 is directly connected, Loopback0
> > C 10.1.3.0 is directly connected, Serial1
> > D EX 10.1.2.0 [170/2560025856] via 10.1.3.2, 00:34:57, Serial1
> > D EX 10.1.1.0 [170/2560025856] via 10.1.3.2, 00:23:41, Serial1
> > C 10.1.4.0 is directly connected, Ethernet0
> >
> > D EX 2.2.2.0 [170/2560025856] via 10.1.3.2, 00:00:47, Serial1
> > C 3.3.3.0 is directly connected, Loopback0
> > C 10.1.3.0 is directly connected, Serial1
> > D EX 10.1.2.0 [170/2560025856] via 10.1.3.2, 00:36:15, Serial1
> > D EX 10.1.1.0 [170/2560025856] via 10.1.3.2, 00:25:00, Serial1
> > C 10.1.4.0 is directly connected, Ethernet0
> >
> >
> > r1#sh ip bg
> > Network Next Hop Metric LocPrf Weight Path
> > *> 1.1.1.0/24 0.0.0.0 0 32768 i
> > *>i2.2.2.0/24 2.2.2.2 0 100 0 i
> > *>i3.3.3.0/24 2.2.2.2 0 100 0 65200 i
> >
> > Network Next Hop Metric LocPrf Weight Path
> > *> 1.1.1.0/24 0.0.0.0 0 32768 i
> > *>i2.2.2.0/24 2.2.2.2 0 100 0 i
> >
> > r2#sh ip bg
> > Network Next Hop Metric LocPrf Weight Path
> > *>i1.1.1.0/24 1.1.1.1 0 100 0 i
> > *> 2.2.2.0/24 0.0.0.0 0 32768 i
> > *> 3.3.3.0/24 3.3.3.3 0 0 65200 I
> >
> > Network Next Hop Metric LocPrf Weight Path
> > *>i1.1.1.0/24 1.1.1.1 0 100 0 i
> > *> 2.2.2.0/24 0.0.0.0 0 32768 i
> > * 3.3.3.0/24 3.3.3.3 0 0 65200 i
> >
> > r3#sh ip bg
> > Network Next Hop Metric LocPrf Weight Path
> > *> 1.1.1.0/24 2.2.2.2 0 65100 i
> > *> 2.2.2.0/24 2.2.2.2 0 0 65100 i
> > *> 3.3.3.0/24 0.0.0.0 0 32768 i
> >
> > Network Next Hop Metric LocPrf Weight Path
> > * 1.1.1.0/24 2.2.2.2 0 65100 i
> > * 2.2.2.0/24 2.2.2.2 0 0 65100 i
> > *> 3.3.3.0/24 0.0.0.0 0 32768 i
> >
> >
> > >From: "John Matijevic" <matijevi@bellsouth.net>
> > >To: "Larry Cain" <l_u_cain@hotmail.com>,<ccielab@groupstudy.com>
> > >Subject: Re: BGP Flapping routes
> > >Date: Mon, 18 Aug 2003 12:46:09 -0400
> > >
> >
> >
> > Hello Larry,
> > Im not quite understanding what the problem is in particular the
>following:
> > The BGP routes from other AS (loopbacks) are in the table for 60s with
>*>,
> > then 60s with only > on both R2 and R3.
> > R1 only sees R3 loop when R2 has *> (obviously).
> > Can you please try to rephrase what you mean here?
> > Also could you post sh ip route, and sh ip bgp, on all 3 routers?
> > Sincerely,
> > Matijevic
> > ----- Original Message -----
> > From: "Larry Cain" <l_u_cain@hotmail.com>
> > To: <ccielab@groupstudy.com>
> > Sent: Monday, August 18, 2003 12:34 PM
> > Subject: BGP Flapping routes
> >
> >
> > >Hi Group
> > >
> > >Have got a BGP route flapping route problem.
> > >
> > >R1 and R2 talking OSPF. R2 and R3 talking eigrp. They are
>redistributing
> > >both ways.
> > >IGP routing tables are correct on R1 and R3 - seeing all networks
> > including
> > >remote e0 networks.
> > >R1 and R2 in same AS 65100. R3 in AS 65200.
> > >Only Loopbacks put into BGP.
> > >
> > >
> > >|--e0--R1----s0----R2----s1----R3--e0--|
> > >
> > >---------OSPF--------|---------eigrp--------
> > >
> > >|------bgp65100------| |--bgp65200--|
> > >
> > >The BGP routes from other AS (loopbacks) are in the table for 60s with
>*>,
> > >then 60s with only > on both R2 and R3.
> > >R1 only sees R3 loop when R2 has *> (obviously).
> > >
> > >As I say this happens every minute.
> > >Please help!!!!
> > >
> > >Configs below:
> > >
> > >All the best
> > >
> > >Larry
> > >
> > >ROUTER R1
> > >interface Loopback0
> > >ip address 1.1.1.1 255.255.255.0
> > >!
> > >interface Ethernet0
> > >ip address 10.1.1.1 255.255.255.0
> > >!
> > >interface Serial0
> > >ip address 10.1.2.1 255.255.255.0
> > >!
> > >router ospf 1
> > >network 1.1.1.0 0.0.0.255 area 0
> > >network 10.0.0.0 255.0.0.0 area 0
> > >!
> > >router bgp 65100
> > >network 1.1.1.0 mask 255.255.255.0
> > >neighbor 2.2.2.2 remote-as 65100
> > >no auto-summary
> > >!
> > >
> > >ROUTER R2
> > >interface Loopback0
> > >ip address 2.2.2.2 255.255.255.0
> > >!
> > >interface Serial0
> > >ip address 10.1.2.2 255.255.255.0
> > >!
> > >interface Serial1
> > >ip address 10.1.3.2 255.255.255.0
> > >!
> > >router ospf 1
> > >redistribute eigrp 1 metric 5 subnets
> > >network 2.2.2.0 0.0.0.255 area 0
> > >network 10.1.2.0 0.0.0.255 area 0
> > >!
> > >router eigrp 1
> > >redistribute ospf 1 metric 1 1 1 1 1
> > >network 10.1.3.0 0.0.0.255
> > >!
> > >router bgp 65100
> > >network 2.2.2.0 mask 255.255.255.0
> > >neighbor 1.1.1.1 remote-as 65100
> > >neighbor 3.3.3.3 remote-as 65200
> > >no auto-summary
> > >!
> > >
> > >ROUTER R3
> > >interface Loopback0
> > >ip address 3.3.3.3 255.255.255.0
> > >!
> > >interface Ethernet0
> > >ip address 10.1.4.3 255.255.255.0
> > >!
> > >interface Serial1
> > >ip address 10.1.3.3 255.255.255.0
> > >!
> > >router eigrp 1
> > >redistribute ospf 1 metric 1 1 1 1 1
> > >network 10.1.3.0 0.0.0.255
> > >network 10.1.4.0 0.0.0.255
> > >no auto-summary
> > >!
> > >router bgp 65200
> > >network 3.3.3.0 mask 255.255.255.0
> > >neighbor 2.2.2.2 remote-as 65100
> > >no auto-summary
> > >!
> > >
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This archive was generated by hypermail 2.1.4 : Tue Sep 02 2003 - 18:54:01 GMT-3