11-01-2014 10:45 AM - edited 03-05-2019 12:05 AM
Hello,
I am new to BGP, i am trying lab scenario similar to the one found in Cisco support site (http://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/26634-bgp-toc.html#synch). However its not going as planned. Below is the topology diagram and the router configs.
I am unable to establish communication between R4 & R5. Using Full mesh iBGP, i want the achieve the result instead of redistribution.
And When issue command " show ip bgp " , Nothing is displayed.
Any pointers would be greatly appreciated.
R4#sh run | s bgp
router bgp 100
no synchronization
bgp log-neighbor-changes
neighbor 10.10.10.2 remote-as 200
no auto-summary
R4#sh ip int bri | e un
Interface IP-Address OK? Method Status Protocol
FastEthernet0/0 10.10.10.1 YES manual up up
R1#sh run | s router
router ospf 1
log-adjacency-changes
network 20.20.1.1 0.0.0.0 area 0
router bgp 200
no synchronization
bgp log-neighbor-changes
neighbor 10.10.10.1 remote-as 100
neighbor 20.20.1.2 remote-as 200
neighbor 20.20.2.1 remote-as 200
no auto-summary
R1#sh ip int bri | e un
Interface IP-Address OK? Method Status Protocol
FastEthernet0/0 10.10.10.2 YES manual up up
FastEthernet0/1 20.20.1.1 YES manual up up
R1#sh ip ospf neighbor
Neighbor ID Pri State Dead Time Address Interface
20.20.2.2 0 FULL/ - 00:00:34 20.20.1.2 FastEthernet0/1
R3# sh run | s rout
router ospf 1
log-adjacency-changes
network 20.20.0.0 0.0.255.255 area 0
router bgp 200
no synchronization
bgp log-neighbor-changes
neighbor 20.20.1.1 remote-as 200
neighbor 20.20.2.1 remote-as 200
no auto-summary
R3#sh ip int bri | e un
Interface IP-Address OK? Method Status Protocol
FastEthernet0/1 20.20.1.2 YES manual up up
FastEthernet1/0 20.20.2.2 YES manual up up
R3#sh ip ospf neighbor
Neighbor ID Pri State Dead Time Address Interface
30.30.30.2 0 FULL/ - 00:00:39 20.20.2.1 FastEthernet1/0
20.20.1.1 0 FULL/ - 00:00:32 20.20.1.1 FastEthernet0/1
R2#sh run | s rout
router ospf 1
log-adjacency-changes
network 20.20.2.1 0.0.0.0 area 0
router bgp 200
no synchronization
bgp log-neighbor-changes
neighbor 20.20.1.1 remote-as 200
neighbor 20.20.2.2 remote-as 200
neighbor 30.30.30.1 remote-as 300
no auto-summary
R2#sh ip int bri | e un
Interface IP-Address OK? Method Status Protocol
FastEthernet1/0 20.20.2.1 YES manual up up
FastEthernet2/0 30.30.30.2 YES manual up up
R2#sh ip ospf neighbor
Neighbor ID Pri State Dead Time Address Interface
20.20.2.2 0 FULL/ - 00:00:30 20.20.2.2 FastEthernet1/0
R5# sh run | s bgp
router bgp 300
no synchronization
bgp log-neighbor-changes
neighbor 30.30.30.2 remote-as 200
no auto-summary
R5#sh ip int bri | e un
Interface IP-Address OK? Method Status Protocol
FastEthernet2/0 30.30.30.1 YES manual up up
Thank You
Regards
Saran
11-03-2014 01:08 AM
11-03-2014 06:04 PM
Hi Saran,
You need to add network statements under BGP on both R4 & R5 routers for networks 10.10.10.0 & 30.30.30.0 respectively.
***********Plz do rate this post if you found it helpful*************************
Thanks & Regards,
Vignesh R P
11-03-2014 11:22 PM
Saran,
You can achieve your objective using below method -
eBGP peering between R4 and R5 can be established on non-directly connected or loopback interface IP.
In AS 200 (iBGP peering will be stablished) you will need to activate route reflector client to ensure iBGP peer share the routes received from another iBGP peer.
Advertised networks / IP's you wanted to be reachable from R4 and R5.
You need to ensure IP address on you need to establish peering should vice-versa reachable from R4 and R5 routers.
Happy to help
Rate if you find answer is helpful.
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