Di Posting Oleh : Simple Learning
Kategori : BGP Core Technologies Routing
Prerequisites: CCNP level skills.
Topology
Note!
Use the Lab 92 configuration.
Use the Lab 92 configuration.
Pic. 1 - Topology Diagram.
Icons designed by: Andrzej Szoblik - http://www.newo.pl
Task 1
Ensure reachability between 172.16.102.0/24 and 172.16.105.0/24.
Lab Solution
Task 1
Ensure reachability between 172.16.102.0/24 and 172.16.105.0/24.
Since IBGP Split-Horizon rule forbids to advertise prefixes learned from IBGP peer to another IBGP peer, R1 does not forward 172.16.102.0/24 to R5 and 172.16.105.0/24 to R2. There are two solutions to this problem:
- Route-Reflector configuration on R1 (disabling IBGP Split-Horizon)
- Configure BGP Confederations
Pic. 2 - R3's BGP Table.
Notice!
R3 does not receive 172.16.102.0/24 from R1.
Pic. 3 - R4's BGP Table.
Notice!
R4 does not receive 172.16.105.0/24 from R1.R1 Configuration:
!
router bgp 134
no synchronization
bgp router-id 172.16.101.1
bgp log-neighbor-changes
network 172.16.101.0 mask 255.255.255.0
neighbor 10.1.13.3 remote-as 134
neighbor 10.1.13.3 route-reflector-client
neighbor 10.1.14.4 remote-as 134
neighbor 10.1.14.4 route-reflector-client
no auto-summary
no synchronization
bgp router-id 172.16.101.1
bgp log-neighbor-changes
network 172.16.101.0 mask 255.255.255.0
neighbor 10.1.13.3 remote-as 134
neighbor 10.1.13.3 route-reflector-client
neighbor 10.1.14.4 remote-as 134
neighbor 10.1.14.4 route-reflector-client
no auto-summary
!
Verfication:
Pic. 4 - Ping Test.
The rules with route-reflectors are as in below:
Pic.5 - Route-Reflector-Rules
Pic. 6 - Prefixes from Route-Reflector-Clients.
Once Route-Reflectors are configured, two additional attributes begin to play a major role when Route-Reflector Clusters are in place (multiple route-reflectors for redundancy purposes).
Pic. 7 - Route Originator and Cluster List.
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