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 R4 receives the traffic towards 172.16.104.0/24 from R1, and the traffic towards 172.16.144.0/24 from R2. Use MED to accomplish the goal.
Lab Solution
Task 1
Ensure that R4 receives the traffic towards 172.16.104.0/24 from R1, and the traffic towards 172.16.144.0/24 from R2. Use MED to accomplish the goal.
Pic. 2 -Traceroute from R5.
Currently, traffic is sent through R1 to both destinations.
Pic. 3 - BGP Table on R3.
R4 Configuration:
!
ip prefix-list Lo0 seq 5 permit 172.16.104.0/24
ip prefix-list Lo1 seq 5 permit 172.16.144.0/24
!
route-map RETURN_TRAFFIC_FROM_R1 permit 10
match ip address prefix-list Lo1
set metric 300
!
route-map RETURN_TRAFFIC_FROM_R1 permit 999
!
route-map RETURN_TRAFFIC_FROM_R2 permit 10
match ip address prefix-list Lo0
set metric 300
!
route-map RETURN_TRAFFIC_FROM_R2 permit 999
!
router bgp 40
no synchronization
bgp router-id 172.16.104.4
bgp log-neighbor-changes
network 172.16.104.0 mask 255.255.255.0
network 172.16.144.0 mask 255.255.255.0
neighbor 10.1.14.1 remote-as 123
neighbor 10.1.14.1 next-hop-self
neighbor 10.1.14.1 route-map RETURN_TRAFFIC_FROM_R1 out
neighbor 10.1.24.2 remote-as 123
neighbor 10.1.24.2 next-hop-self
neighbor 10.1.24.2 route-map RETURN_TRAFFIC_FROM_R2 out
no auto-summary
!
ip prefix-list Lo1 seq 5 permit 172.16.144.0/24
!
route-map RETURN_TRAFFIC_FROM_R1 permit 10
match ip address prefix-list Lo1
set metric 300
!
route-map RETURN_TRAFFIC_FROM_R1 permit 999
!
route-map RETURN_TRAFFIC_FROM_R2 permit 10
match ip address prefix-list Lo0
set metric 300
!
route-map RETURN_TRAFFIC_FROM_R2 permit 999
!
router bgp 40
no synchronization
bgp router-id 172.16.104.4
bgp log-neighbor-changes
network 172.16.104.0 mask 255.255.255.0
network 172.16.144.0 mask 255.255.255.0
neighbor 10.1.14.1 remote-as 123
neighbor 10.1.14.1 next-hop-self
neighbor 10.1.14.1 route-map RETURN_TRAFFIC_FROM_R1 out
neighbor 10.1.24.2 remote-as 123
neighbor 10.1.24.2 next-hop-self
neighbor 10.1.24.2 route-map RETURN_TRAFFIC_FROM_R2 out
no auto-summary
!
Notice!
Again, 'clear ip bgp *' out must be issued for the changes to take effect.
Pic. 4 - BGP Table on R3.
Pic. 5 - Traceroute from R5.
0 Response to "Lab 97 - BGP Path Selection using MED"
Post a Comment