From: Larry Cain (l_u_cain@hotmail.com)
Date: Mon Aug 18 2003 - 15:44:44 GMT-3
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