06-05-2007 02:19 AM - edited 03-05-2019 04:29 PM
Hi all,
I am attaching a network diagram
I have used minimum BGP configuration
I want to know what additional configuration required without using any IGP on all routers so that I can reach from every router to every router
Regards
Mahesh
Solved! Go to Solution.
06-05-2007 03:06 AM
Mahesh
You need to advertise out the networks in AS100 to the 7613 router. You can use "network" statements under your BGP config
eg
3750
router bgp 100
network 2.2.2.4 mask 255.255.255.252
etc..
It would be better if you used a different network for the 7613 -> 3750 connection then you could just summarise out the 2.2.2.x networks from the 3750 ie
router bgp 100
network 2.2.2.0 mask 255.255.255.0
HTH
Jon
06-05-2007 02:29 AM
Hi,
You need full mesh iBGP between you iBGP routers, and make sure the peering IPs are pingable from each router (use static routes).
HTH, please do rate all helpful replies,
Mohammed Mahmoud.
06-05-2007 02:34 AM
Hi
Mohammed is spot on. Just to give another option. Rather than full mesh IBGP you could set up your 3750 as a route-reflector for the 2811 and the RAS routers. This would achive the same effect.
HTH
Jon
06-05-2007 02:37 AM
Hi,
Jon is completely right, using RR is the best practice, and even if you want to simplify the configuration, using RR is not a hard task.
HTH,
Mohammed Mahmoud.
06-05-2007 02:43 AM
Ok I have changed config of 3750 like
3750# router bgp 100
no synchronization
bgp log-neighbor-changes
neighbor 2.2.2.1 remote-as 200
neighbor 2.2.2.1 next-hop-self
neighbor 2.2.2.6 remote-as 100
neighbor 2.2.2.6 route-reflector-client
neighbor 2.2.2.18 remote-as 100
neighbor 2.2.2.18 route-reflector-client
no auto-summary
Now I am not able to ping from 2811 to RAS
Do i need static router and where ?
Regards
06-05-2007 02:49 AM
Hi,
Yes you need static routing on both 2811 and RAS pointing to each other peer ips having the next-hop as the 3750 (and the 3750 will route between its directed interfaces).
HTH,
Mohammed Mahmoud.
06-05-2007 02:56 AM
ok i had given static route on 2811 as
ip route 2.2.2.16 255.255.255.252 2.2.2.5
and on RAS
ip route 2.2.2.4 255.255.255.252 2.2.2.17
and that is working
Now to reach from RAS and 2811 to 7613 what should I do
Regards
Mahesh
06-05-2007 03:04 AM
Hi,
This case is slightly different, as the 2811 to 7613 is eBGP not iBGP, and thus you'll need "ebgp-multihop 2" on both sides, plus static routing as before.
HTH,
Mohammed Mahmoud.
06-05-2007 03:06 AM
Mahesh
You need to advertise out the networks in AS100 to the 7613 router. You can use "network" statements under your BGP config
eg
3750
router bgp 100
network 2.2.2.4 mask 255.255.255.252
etc..
It would be better if you used a different network for the 7613 -> 3750 connection then you could just summarise out the 2.2.2.x networks from the 3750 ie
router bgp 100
network 2.2.2.0 mask 255.255.255.0
HTH
Jon
06-05-2007 02:55 AM
Hi
Yes you can use static routes or
1) use network statements under the BGP config to advertise out the subnets on 2811 and RAS.
2) use the "redistribute connected" command under the BGP config.
Depends how many subnets you are using on each router.
HTH
Jon
06-05-2007 04:11 AM
Thanks everybody
Now I had many option without IGP
Really thanks
Mahesh
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