The document provides the configuration steps for a lab exercise on BGP. The steps include:
1. Configuring IBGP and EBGP neighborships between routers as shown in the topology diagram using loopback addresses.
2. Advertising loopback networks in BGP to ensure all routers have the routing information.
3. Configuring route reflectors to reduce the number of neighbor relationships needed.
4. Setting preferences for best paths between routers for certain networks.
1. LAB 11: BGP
Task
1. Configure IP Addresses as per given in topology.
2. Configure IBGP neighborship as per given in topology. Advertise loopback 1 and loopback 2 in
IBGP.
3. Configure Internal BGP neighbor as per given in topology.
4. Make sure Loopback 3 and loopback 4 introduce in BGP network.
5. R3 to R7 receives all the loopback network information in BGP table. (Verify after completion of
this task).
6. Configuration Sub-AS's in BGP AS 300. Make sure R10 and R12 make neighborship with R8 and
R11.
7. Make sure R1 and R2 advertise all the loopbacks in BGP.
8. Configure EBGP neighborship as per given in topology. Make sure EBGP neighborship is configure
using loopback 1 only.
9. Make sure all routers ping loopback addresses. (Do possible Configuration)
10. On R2, Configure R14 as a best path for Network 3.3.3.0 and R8 as a best path for Network
3.3.4.0.
11. Configure weight as 1440 on R8 to make R7 as a best path for BGP routes.
12. Make sure R7 Receives metric 10000 for Network 2.2.1.0 from R3.
Figure 1 Topology
12. LAB 11: BGP
R11
router bgp 300
neighbor 10.0.110.10 next-hop-self
neighbor 10.0.112.12 next-hop-self
R13
router bgp 60
neighbor 10.0.134.14 next-hop-self
R14
router bgp 60
neighbor 10.0.134.13 next-hop-self
(Note: verify using ping command with source address like:
)R3# ping 1.1.1.1 source l3
Task 10: On R2, Configure R14 as a best path for Network 3.3.3.0 and R8 as a best path for
Network 3.3.4.0.
R2
access-list 10 permit 3.3.3.0 0.0.0.255
access-list 20 permit 3.3.4.0 0.0.0.255
route-map Local permit 10
match ip address 10
set local-preference 500
exit
route-map Local permit 20
exit
route-map R8 permit 21
match ip address 20
set local-preference 600
exit
route-map R8 permit 30
exit
13. LAB 11: BGP
router bgp 200
neighbor 14.14.1.1 route-map Local in
neighbor 8.8.1.1 route-map R8 in
Task 11: Configure weight as 1440 on R8 to make R7 as a best path for BGP routes.
R8
router bgp 300
neighbor 10.0.78.7 weight 1440
Task 12: Make sure R7 Receives metric 10000 for Network 2.2.1.0 from R3.
R7
access-list 10 permit 2.2.1.0 0.0.0.255
route-map Filter permit 10
match ip address 10
set metric 10000
exit
route-map Filter permit 20
exit
router bgp 1100
neighbor 10.0.37.3 route-map Filter in