BGP CHAPTER 10(Lab on AS-PREPEND)

BGP CHAPTER 10(Lab on AS-PREPEND)
21. Task:
According to Diagram:
- use private AS for client(Cust1).
- Send network 172.16.1.1 as primary to ISP1 & secondary to ISP2
- Send network 192.168.1.1 as primary to ISP2 & secondary to ISP1
- Use as-prepend for this task.
- Remove private-as while sending cust1 network to ISP's. 

 NOte: Look carefully the configuration of R2.
 ----> diag:

 Solution:

Configuration on devices:


hostname R1
!
!
interface Loopback1
 ip address 172.16.1.1 255.255.255.255
!
interface Loopback2
 ip address 192.168.1.1 255.255.255.255
!
interface FastEthernet0/0
 no ip address
 shutdown
 duplex auto
 speed auto
!
interface FastEthernet0/1
 ip address 10.1.12.1 255.255.255.0
 duplex auto
 speed auto
!
router bgp 65500
 no synchronization
 bgp log-neighbor-changes
 network 172.16.1.1 mask 255.255.255.255
 network 192.168.1.1 mask 255.255.255.255
 neighbor 10.1.12.2 remote-as 23
 no auto-summary
!
!
end

!

hostname R2

!

!

interface Loopback1

 ip address 2.2.2.2 255.255.255.255

!

interface FastEthernet0/0

 ip address 10.1.23.2 255.255.255.0

 duplex auto

 speed auto

!

interface Serial0/0

 no ip address

 shutdown

 clock rate 2000000

!

interface FastEthernet0/1

 ip address 10.1.12.2 255.255.255.0

 duplex auto

 speed auto

!

interface Serial0/1

 no ip address

 shutdown

 clock rate 2000000

!

router ospf 1

 log-adjacency-changes

 passive-interface FastEthernet0/1

 network 2.2.2.2 0.0.0.0 area 0

 network 10.1.12.0 0.0.0.255 area 0

 network 10.1.23.0 0.0.0.255 area 0

!

router bgp 23

 no synchronization

 bgp log-neighbor-changes

 neighbor 3.3.3.3 remote-as 23

 neighbor 3.3.3.3 update-source Loopback1

 neighbor 10.1.12.1 remote-as 65500

 no auto-summary

!

end

!

hostname R3

!

!

interface Loopback1

 ip address 3.3.3.3 255.255.255.255

!

interface FastEthernet0/0

 ip address 10.1.23.3 255.255.255.0

 duplex auto

 speed auto

!

interface Serial0/0

 ip address 10.1.34.3 255.255.255.0

 clock rate 2000000

!

interface FastEthernet0/1

 no ip address

 shutdown

 duplex auto

 speed auto

!

interface Serial0/1

 ip address 10.1.35.3 255.255.255.0

 clock rate 2000000

!

interface Serial0/2

 no ip address

 shutdown

 clock rate 2000000

!

interface Serial0/3

 no ip address

 shutdown

 clock rate 2000000

!

router ospf 1

 log-adjacency-changes

 network 3.3.3.3 0.0.0.0 area 0

 network 10.1.23.0 0.0.0.255 area 0

!

router bgp 23

 no synchronization

 bgp log-neighbor-changes

 neighbor 2.2.2.2 remote-as 23

 neighbor 2.2.2.2 update-source Loopback1

 neighbor 10.1.34.4 remote-as 400

 neighbor 10.1.34.4 remove-private-as

 neighbor 10.1.34.4 route-map PREPEND out

 neighbor 10.1.35.5 remote-as 500

 neighbor 10.1.35.5 remove-private-as

 neighbor 10.1.35.5 route-map PREPEND2 out

 no auto-summary

!

ip forward-protocol nd

!

!

no ip http server

no ip http secure-server

!

!

ip prefix-list M172 seq 10 permit 172.16.1.1/32

!

ip prefix-list M192 seq 10 permit 192.168.1.1/32

!

route-map PREPEND permit 10

 match ip address prefix-list M172

!

route-map PREPEND permit 20

 match ip address prefix-list M192

 set as-path prepend 23 23 23 23

!

route-map PREPEND2 permit 10

 match ip address prefix-list M192

!

route-map PREPEND2 permit 20

 set as-path prepend 23 23 23 23

!

end

!

hostname R4

!

!

interface Loopback1

 ip address 4.4.4.4 255.255.255.255

!

interface FastEthernet0/0

 no ip address

 shutdown

 duplex auto

 speed auto

!

interface Serial0/0

 ip address 10.1.34.4 255.255.255.0

 clock rate 2000000

!

interface FastEthernet0/1

 no ip address

 shutdown

 duplex auto

 speed auto

!

interface Serial0/1

 no ip address

 shutdown

 clock rate 2000000

!

router bgp 400

 no synchronization

 bgp log-neighbor-changes

 neighbor 10.1.34.3 remote-as 23

 no auto-summary

!

end

!

hostname R5

!

!

interface Loopback1

 ip address 5.5.5.5 255.255.255.255

!

interface FastEthernet0/0

 no ip address

 shutdown

 duplex auto

 speed auto

!

interface Serial0/0

 no ip address

 shutdown

 clock rate 2000000

!

interface FastEthernet0/1

 no ip address

 shutdown

 duplex auto

 speed auto

!

interface Serial0/1

 ip address 10.1.35.5 255.255.255.0

 clock rate 2000000

!

router bgp 500

 no synchronization

 bgp log-neighbor-changes

 neighbor 10.1.35.3 remote-as 23

 no auto-summary

!

end

----------------------------------------------------------------

OUTPUT on ISP1 & ISP2
  R4(config-router)#do sh ip bgp
BGP table version is 15, local router ID is 4.4.4.4
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
              r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete

   Network          Next Hop            Metric LocPrf Weight Path
*> 172.16.1.1/32    10.1.34.3                              0 23 i
*> 192.168.1.1/32   10.1.34.3                              0 23 23 23 23 23 i

R5(config-router)#do sh ip bgp
BGP table version is 19, local router ID is 5.5.5.5
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
              r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete

   Network          Next Hop            Metric LocPrf Weight Path
*> 172.16.1.1/32    10.1.35.3                              0 23 23 23 23 23 i
*> 192.168.1.1/32   10.1.35.3                              0 23 i