Lab 96 - BGP Path Selection using Local Preference

Lab 96 - BGP Path Selection using Local Preference
Di Posting Oleh : Simple Learning
Kategori : BGP Core Technologies Routing

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
Ensure that the router ins AS 13 send traffic towards 172.16.104.0/24 and 172.16.144.0/24 through AS 20.

Lab Solution

Task 1
Ensure that the router ins AS 13 send traffic towards 172.16.104.0/24 and 172.16.144.0/24 through AS 20.

Notice!
Local Preference attribute is automatically set to 100 for all incoming prefixes.

Pic. 2 - BGP Table on R1 Before Change.

Pic. 3 - BGP Table on R3 Before Change.

Pic. 4 - R3' Detailed Information: 172.16.104.0/24

R3 Configuration:

!

access-list 1 permit 172.16.144.0
access-list 1 permit 172.16.104.0
!

route-map SET_LP permit 10
 match ip address 1
 set local-preference 200
!

route-map SET_LP permit 20
!

router bgp 13
 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 13
 neighbor 10.1.13.1 next-hop-self
 neighbor 10.1.23.2 remote-as 20
 neighbor 10.1.23.2 route-map SET_LP in
 neighbor 10.1.35.5 remote-as 50
 no auto-summary

!

Pic. 5 - BGP Table on R1 After Change.

Pic. 6 - R1's Detailed Information: 172.16.104.0/24.

Tweet