From: John Matijevic (matijevi@bellsouth.net)
Date: Mon Aug 18 2003 - 18:21:16 GMT-3
Hello Larry,
Im going to try to reproduce your problem, can you send me full configs of
R1, R2 and R3.
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 5:04 PM
Subject: Re: BGP Flapping routes
> 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