From: Larry Cain (l_u_cain@hotmail.com)
Date: Mon Aug 18 2003 - 13:42:27 GMT-3
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>Date: Mon, 18 Aug 2003 16:34:15 GMT
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>From: "Larry Cain" <l_u_cain@hotmail.com>
>To: ccielab@groupstudy.com
>Subject: BGP Flapping routes
>Date: Mon, 18 Aug 2003 16:34:07 +0000
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>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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