Di Posting Oleh : Simple Learning
Kategori : BGP Core Technologies Routing
Prerequisites: CCNP level skills.
Topology
Pic. 1 - Topology Diagram.
Icons designed by: Andrzej Szoblik - http://www.newo.pl
R5 is connecting to their Service Provider. The company has neither their own public AS number nor their public IP addresses. For the purpose of BGP configuration AS 123 has allocated a private as number for R5 (AS 65005). Configure routers in AS 123 so this private AS number is not advertised over EBGP peerings.
Solution
Task 1
R5 is connecting to their Service Provider. The company has neither their own public AS number nor their public IP addresses. For the purpose of BGP configuration AS 123 has allocated a private as number for R5 (AS 65005). Configure routers in AS 123 so this private AS number is not advertised over EBGP peerings.
Pic. 2 - R4 Receives the Private AS number from R1 and R2.
!
router bgp 123
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 123
neighbor 10.1.13.3 next-hop-self
neighbor 10.1.14.4 remote-as 40
neighbor 10.1.14.4 remove-private-as
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 123
neighbor 10.1.13.3 next-hop-self
neighbor 10.1.14.4 remote-as 40
neighbor 10.1.14.4 remove-private-as
no auto-summary
!
R2 Configuration:
!
router bgp 123
no synchronization
bgp router-id 172.16.102.2
bgp log-neighbor-changes
network 172.16.102.0 mask 255.255.255.0
neighbor 10.1.23.3 remote-as 123
neighbor 10.1.23.3 next-hop-self
neighbor 10.1.24.4 remote-as 40
neighbor 10.1.24.4 remove-private-as
no auto-summary
no synchronization
bgp router-id 172.16.102.2
bgp log-neighbor-changes
network 172.16.102.0 mask 255.255.255.0
neighbor 10.1.23.3 remote-as 123
neighbor 10.1.23.3 next-hop-self
neighbor 10.1.24.4 remote-as 40
neighbor 10.1.24.4 remove-private-as
no auto-summary
!
Pic. 3 - BGP Table on R4.
Both R1 and R2 have removed the private AS from their advertisement sent to AS 40.
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