Prerequisites: CCNP level skills.
Topology
Note!
All routers are configured as per topology diagram (pic. 1) and loopback advertised into BGP.
Pic. 1 - Topology Diagram.
Icons designed by: Andrzej Szoblik - http://www.newo.pl
Task 1
On R2, manipulate paths using weight attribute so it chooses R4 as the gateway to:
- 172.16.101.0/24
- 172.16.105.0/24
Task 1
On R2, manipulate paths using weight attribute so it chooses R4 as the gateway to:
- 172.16.101.0/24
- 172.16.105.0/24
Pic. 2 - BGP Table on R2 Before Change.
!
ip prefix-list CHANGE seq 5 permit 172.16.101.0/24
ip prefix-list CHANGE seq 10 permit 172.16.105.0/24
!
ip prefix-list CHANGE seq 10 permit 172.16.105.0/24
!
route-map SET_WEIGHT permit 10
match ip address prefix-list CHANGE
set weight 50
!
router bgp 20
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 13
neighbor 10.1.24.4 remote-as 40
neighbor 10.1.24.4 route-map SET_WEIGHT in
no auto-summary
match ip address prefix-list CHANGE
set weight 50
!
router bgp 20
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 13
neighbor 10.1.24.4 remote-as 40
neighbor 10.1.24.4 route-map SET_WEIGHT in
no auto-summary
!
Notice!
For this change to take effect 'clear ip bgp * in' ('*' or the neighbor in question).
Pic. 3 - BGP Table on R2 After Change.
