Prerequisites: CCNP level skills.
Note!
Use the configuration from Lab 129 except for 'next-hop-self' command.
Topology
Similarly to the lab 129, deal with the next hop on R1, R2 and R3, but do not use 'next-hop-self' command or redistribution into IGP.
Solution
Task 1
Similarly to the lab 129, deal with the next hop on R1, R2 and R3, but do not use 'next-hop-self' command or redistribution into IGP.
R1 Configuration:
!
route-map SET_NEXT_HOP permit 10
set ip next-hop 10.1.13.1
!
router bgp 123
no synchronization
bgp router-id 172.16.101.1
bgp log-neighbor-changes
network 172.16.101.0 mask 255.255.255.0
neighbor 10.1.13.3 remote-as 123
neighbor 10.1.13.3 route-map SET_NEXT_HOP out
neighbor 10.1.14.4 remote-as 40
no auto-summary
set ip next-hop 10.1.13.1
!
router bgp 123
no synchronization
bgp router-id 172.16.101.1
bgp log-neighbor-changes
network 172.16.101.0 mask 255.255.255.0
neighbor 10.1.13.3 remote-as 123
neighbor 10.1.13.3 route-map SET_NEXT_HOP out
neighbor 10.1.14.4 remote-as 40
no auto-summary
!
Then, 'clear ip bgp * out'
Notice!
While configuring the 'set ip next-hop 10.1.13.1' we get the warning which can be ignored. We know what we're doing after all ;)
Pic. 2 - Warning.
!
route-map SET_NEXT_HOP permit 10
set ip next-hop 10.1.23.2
!
set ip next-hop 10.1.23.2
!
router bgp 123
no synchronization
bgp router-id 172.16.102.2
bgp log-neighbor-changes
network 172.16.102.0 mask 255.255.255.0
neighbor 10.1.23.3 remote-as 123
neighbor 10.1.23.3 route-map SET_NEXT_HOP out
neighbor 10.1.24.4 remote-as 40
no auto-summary
no synchronization
bgp router-id 172.16.102.2
bgp log-neighbor-changes
network 172.16.102.0 mask 255.255.255.0
neighbor 10.1.23.3 remote-as 123
neighbor 10.1.23.3 route-map SET_NEXT_HOP out
neighbor 10.1.24.4 remote-as 40
no auto-summary
!
R3 Configuration:
!
route-map SET_NEXT_HOP_R2 permit 10
set ip next-hop 10.1.23.3
!
route-map SET_NEXT_HOP_R1 permit 10
set ip next-hop 10.1.13.3
!
router bgp 123
no synchronization
bgp router-id 172.16.103.3
bgp log-neighbor-changes
network 172.16.103.0 mask 255.255.255.0
neighbor 10.1.13.1 remote-as 123
neighbor 10.1.13.1 route-reflector-client
neighbor 10.1.13.1 route-map SET_NEXT_HOP_R1 out
neighbor 10.1.23.2 remote-as 123
neighbor 10.1.23.2 route-reflector-client
neighbor 10.1.23.2 route-map SET_NEXT_HOP_R2 out
neighbor 10.1.35.5 remote-as 50
no auto-summary
set ip next-hop 10.1.23.3
!
route-map SET_NEXT_HOP_R1 permit 10
set ip next-hop 10.1.13.3
!
router bgp 123
no synchronization
bgp router-id 172.16.103.3
bgp log-neighbor-changes
network 172.16.103.0 mask 255.255.255.0
neighbor 10.1.13.1 remote-as 123
neighbor 10.1.13.1 route-reflector-client
neighbor 10.1.13.1 route-map SET_NEXT_HOP_R1 out
neighbor 10.1.23.2 remote-as 123
neighbor 10.1.23.2 route-reflector-client
neighbor 10.1.23.2 route-map SET_NEXT_HOP_R2 out
neighbor 10.1.35.5 remote-as 50
no auto-summary
!
Verification:
This time let's check if R1 and R2 have the best path to prefix from AS 50.
Pic. 3 - AS 50 Prefix on R1.
Pic. 3 - AS 50 Prefix on R2.
