04-12-2023 10:50 PM
Hi All,
Refer to the diagram Host-A can communicate Host-B and Host-C can communicate with Host-D but Host-A and Host-B can not communicate with Host-C and D. Where as every where route is available.
NOTE:
From R-3 and 4 I can reach Host-C and D
From R-1 and 2 I can reach Host-A and B
Please refer attached diagram.
Solved! Go to Solution.
04-13-2023 02:07 AM
Yes as I mention before you config is correct,
Now you can ping/trace from host to host
BUT why router can not ? because in router you need to add source to ping/trace, this source must know from all router in path to destination.
04-12-2023 11:32 PM
Remove defualt route from you network are check then other bgp path are it show valid best ??
04-12-2023 11:35 PM
Hi MHM Thanks for your reply.
But I don't have any default route in this network
04-12-2023 11:47 PM - last edited on 04-17-2023 11:12 PM by Translator
Can I see
show ip bgp
in R4?
04-13-2023 12:03 AM
04-13-2023 12:04 AM - last edited on 04-19-2023 12:03 AM by Translator
Hello
The most probable cause is
next-hop
reachability within your ibgp network, make sure you have full igp connectivity to all ibgp peer rtrs transit networks also on each ibgp router to each ibgp peer append the
neighbour next-hop-self command
example:
rtr1-4
router eigrp 100
no auto-summary
network 0.0.0.0 0.0.0.0
router bgp 65000
no auto-summary
neighbour <ibgp peer1> next-hop-self
neighbour <ibgp peer2> next-hop-self
neighbour <ibgp peer3> next-hop-self
04-13-2023 12:15 AM
Hi Paul,
Thanks for the reply. I have configure next hop self in R-4 towards all iBGP Peer. But Problem same
04-13-2023 12:31 AM - last edited on 04-17-2023 11:41 PM by Translator
Not only R4 need
next-hop self
But all ibgp router need that.
Config
next-hop self
in all and do ping again.
Thanks
MHM
04-13-2023 12:39 AM - last edited on 04-17-2023 11:18 PM by Translator
I did the same. but still
R-1#sho running-config | section bgp
router bgp 65000
bgp log-neighbor-changes
neighbor 192.168.2.2 remote-as 65000
neighbor 192.168.2.2 next-hop-self
neighbor 192.168.4.1 remote-as 65000
neighbor 192.168.4.1 next-hop-self
neighbor 192.168.6.1 remote-as 65000
neighbor 192.168.6.1 next-hop-self all
neighbor 192.168.13.1 remote-as 65002
neighbor 192.168.15.1 remote-as 65001
--------------------------------
R-2#sho running-config | sec bgp
router bgp 65000
bgp log-neighbor-changes
neighbor 192.168.2.1 remote-as 65000
neighbor 192.168.2.1 next-hop-self
neighbor 192.168.3.1 remote-as 65000
neighbor 192.168.3.1 next-hop-self
neighbor 192.168.5.1 remote-as 65000
neighbor 192.168.5.1 next-hop-self
neighbor 192.168.12.1 remote-as 65002
neighbor 192.168.14.1 remote-as 65001
R-2#
-----------------------------------
R-3#sho run
R-3#sho running-config | sec bgp
router bgp 65000
bgp log-neighbor-changes
neighbor 192.168.3.2 remote-as 65000
neighbor 192.168.3.2 next-hop-self
neighbor 192.168.6.2 remote-as 65000
neighbor 192.168.6.2 next-hop-self
neighbor 192.168.7.2 remote-as 65000
neighbor 192.168.7.2 next-hop-self
neighbor 192.168.9.1 remote-as 65004
neighbor 192.168.10.1 remote-as 65003
R-3#
R-3#
-----------------------------
R-4#sho running-config | section bgp
router bgp 65000
bgp log-neighbor-changes
neighbor 192.168.4.2 remote-as 65000
neighbor 192.168.4.2 next-hop-self
neighbor 192.168.5.2 remote-as 65000
neighbor 192.168.5.2 next-hop-self
neighbor 192.168.7.1 remote-as 65000
neighbor 192.168.7.1 next-hop-self
neighbor 192.168.8.1 remote-as 65004
neighbor 192.168.11.1 remote-as 65003
R-4#
-----------------------------
04-13-2023 12:41 AM - last edited on 04-17-2023 11:19 PM by Translator
Clear ip bgp x
DO this in ibgp router
Check again
04-13-2023 12:57 AM
just Did the same but issue is same.
04-13-2023 12:58 AM - last edited on 04-17-2023 11:20 PM by Translator
Share
ip bgp
of R4
04-13-2023 12:49 AM - last edited on 04-17-2023 11:22 PM by Translator
Hello
Do you have the routes that you cannot reach in the bgp table, and is the next hop of that bgp route valid or is it stating inaccessible?
sh ip bgp x.x.x.x
04-13-2023 12:59 AM - last edited on 04-17-2023 11:22 PM by Translator
in all router
#sho ip bgp #sho ip route
is available. Just tell me one thing that shall I advertise all the iBGP directly connected /30 network too?
04-13-2023 12:49 AM
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
New here? Get started with these tips. How to use Community New member guide