From: Reinhold Fischer (Reinhold.Fischer@gmx.net)
Date: Wed Mar 01 2006 - 16:16:20 GMT-3
hi,
the backdoor command should be on the bgp router that receives
the route. So you would need on r1:
router bgp x
network 4.4.4.4 mask 255.255.255.255 backdoor
and on r4:
router bgp y
network 1.1.1.1 mask 255.255.255.255 backdoor.
assuming the loobpack interfaces are configured as /32
regards
reinhold
On Wed, Mar 01, 2006 at 01:39:09PM -0500, Mushtaq A. Khan wrote:
> Hi Group,
>
> I have an issue with eBGP session that continuously boucning between two
> routers. I have a scenario where R1 is hub and R2 & R4 are spoke and all are
> running EIGRP. I'm adv loopback 1.1.1.1 and loopback 4.4.4.4 from R1 and R4
> respectively via EIGRP. R1 has ebgp peering with R4 and there is another
> ebgp peering between R2 and R4. The requirement is also to adv loopback
> 1.1.1.1 and loopback 4.4.4.4 from R1 and R4 respectively via BGP. I am using
> BGP backdoor to avoid recursive routing situation. What I'm noticing that
> eBGP session between R1 and R4 is keep bouncing however there is no issue
> between R2 and R4. Do you guys have any idea as to what is wrong here? Any
> clue?
>
>
> *Sep 23 04:45:18.706: %BGP-3-NOTIFICATION: received from neighbor
> 4.4.4.44/0 (hold time expired) 0 bytes
> *Sep 23 04:45:18.706: %BGP-5-ADJCHANGE: neighbor 4.4.4.4 Down BGP
> Notification received
>
> Configurations details are given below:
>
> R2(AS23)
> /
> /
> R1(AS1)
> \
> \
> R4 (AS4)
>
> R1#sh run | beg router
> router eigrp 100
> network 1.1.1.0 0.0.0.255
> network 172.10.0.0
> no auto-summary
> neighbor 172.10.124.4 Serial0/0
> neighbor 172.10.124.2 Serial0/0
> !
> router bgp 1
> no synchronization
> bgp log-neighbor-changes
> network 1.1.1.0 mask 255.255.255.0 backdoor
> neighbor 4.4.4.4 remote-as 4
> neighbor 4.4.4.4 ebgp-multihop 2
> neighbor 4.4.4.4 update-source Loopback1
> no auto-summary
>
>
> R1#sh ip route 4.4.4.4 <--------------------- NOT sure why this is still
> being learned via bgp even though I'm using BGP backdoor.
> Routing entry for 4.4.4.0/24
> Known via "bgp 1", distance 20, metric 0
> Tag 4, type external
> Last update from 4.4.4.4 00:00:30 ago
> Routing Descriptor Blocks:
> * 4.4.4.4, from 4.4.4.4, 00:00:30 ago
> Route metric is 0, traffic share count is 1
> AS Hops 1
> Route tag 4
>
>
>
> R4#sh run | beg router
> router eigrp 100
> network 4.4.4.0 0.0.0.255
> network 172.10.0.0
> neighbor 172.10.124.1 Serial0/0
> no auto-summary
> !
> router bgp 4
> no synchronization
> bgp log-neighbor-changes
> network 4.4.4.0 mask 255.255.255.0 backdoor
> neighbor 1.1.1.1 remote-as 1
> neighbor 1.1.1.1 ebgp-multihop 2
> neighbor 1.1.1.1 update-source Loopback4
> neighbor 172.10.124.2 remote-as 23
> neighbor 172.10.124.2 ebgp-multihop 255
> no auto-summary
> !
>
> R4#sr 1.1.1.1
> Routing entry for 1.1.1.0/24
> Known via "eigrp 100", distance 90, metric 2297856, type internal
> Redistributing via eigrp 100
> Last update from 172.10.124.1 on Serial0/0, 00:05:30 ago
> Routing Descriptor Blocks:
> * 172.10.124.1, from 172.10.124.1, 00:05:30 ago, via Serial0/0
> Route metric is 2297856, traffic share count is 1
> Total delay is 25000 microseconds, minimum bandwidth is 1544 Kbit
> Reliability 255/255, minimum MTU 1500 bytes
> Loading 1/255, Hops 1
>
> Thanks,
> Mushtaq
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