Di Posting Oleh : Simple Learning
Kategori : BGP Core Technologies Routing
Prerequisites: CCNP level skills.
Topology
Task 1
Configure EBGP between R1 and R3 in such a way that it can survive either Frame-Relay or HDLC link failure.
Lab Solution
Task 1
Configure EBGP between R1 and R3 in such a way that it can survive either Frame-Relay or HDLC link failure.
R1 Configuration:
!
ip route 172.16.103.0 255.255.255.0 10.1.0.3
ip route 172.16.103.0 255.255.255.0 10.1.13.3
!
ip route 172.16.103.0 255.255.255.0 10.1.13.3
!
router bgp 10
no synchronization
bgp router-id 1.1.1.1
bgp log-neighbor-changes
neighbor 172.16.103.3 remote-as 30
neighbor 172.16.103.3 ebgp-multihop 2
neighbor 172.16.103.3 update-source Loopback0
no auto-summary
no synchronization
bgp router-id 1.1.1.1
bgp log-neighbor-changes
neighbor 172.16.103.3 remote-as 30
neighbor 172.16.103.3 ebgp-multihop 2
neighbor 172.16.103.3 update-source Loopback0
no auto-summary
!
R3 Configuration:
!
ip route 172.16.101.0 255.255.255.0 10.1.0.1
ip route 172.16.101.0 255.255.255.0 10.1.13.1
!
ip route 172.16.101.0 255.255.255.0 10.1.0.1
ip route 172.16.101.0 255.255.255.0 10.1.13.1
!
router bgp 30
no synchronization
bgp router-id 3.3.3.3
bgp log-neighbor-changes
neighbor 172.16.101.1 remote-as 10
neighbor 172.16.101.1 ebgp-multihop 2
neighbor 172.16.101.1 update-source Loopback0
no auto-summary
no synchronization
bgp router-id 3.3.3.3
bgp log-neighbor-changes
neighbor 172.16.101.1 remote-as 10
neighbor 172.16.101.1 ebgp-multihop 2
neighbor 172.16.101.1 update-source Loopback0
no auto-summary
!
Notice!
When EBGP sessions are configured it is assumed that the EBGP peer is directly connected. The TTL is automatically set to 1. This way, session between loopback would not work. EBGP-multihop command changes the TTL (here: 2 hops) allowing session to be established.
Verification:
Pic. 2 - BGP Session Established.
Pic. 3 - Neighbor Details.
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