[c-nsp] Internet BGP autofailover

[alex nyagah]

Hi Group,
I have the following configs in my router but auto failover between two ISP
is not working, can someone please help..


interface GigabitEthernet0/1
 description Link to ISP_A
 ip address 10.10.10.205 255.255.255.252
 ip accounting output-packets
 ip flow ingress
 ip nbar protocol-discovery
 duplex auto
 speed auto
  no negotiation auto
!
interface GigabitEthernet0/2
 description Connection to ISP_2
 ip address 20.20.20.34 255.255.255.252
 ip accounting output-packets
 ip flow ingress
 ip nbar protocol-discovery
 load-interval 30
 duplex auto
 speed auto
  no negotiation auto
!
interface GigabitEthernet0/3
 description Connection to WALTER LAN
 ip address 10.20.30.254 255.255.255.0
 ip tcp adjust-mss 1420
 duplex auto
 speed auto
  no negotiation auto
!
router bgp 6450
 bgp log-neighbor-changes
 neighbor 20.20.20.33 remote-as 31177
 neighbor 20.20.20.33 description ISP_A-BGP
 neighbor 20.20.20.33 ebgp-multihop 8
 neighbor 20.20.20.33 update-source GigabitEthernet0/2
 neighbor 10.10.10.206 remote-as 9010
 neighbor 10.10.10.206 description ISP_A-Ke-eBGP
 neighbor 10.10.10.206 update-source GigabitEthernet0/1
 maximum-paths 2
 !
 address-family ipv4
  neighbor 20.20.20.33 activate
  neighbor 20.20.20.33 weight 1000
  neighbor 20.20.20.33 prefix-list WALTER-SUBNET out
  neighbor 20.20.20.33 route-map ISP_B_IMPORT in
  neighbor 10.10.10.206 activate
  neighbor 10.10.10.206 weight 100
  neighbor 10.10.10.206 prefix-list WALTER-SUBNET out
  neighbor 10.10.10.206 route-map prepending in
  maximum-paths 2
  no auto-summary
  no synchronization
  network 10.20.30.0 mask 255.255.255.0
 exit-address-family
!
ip route 10.20.30.0 255.255.255.0 Null0 254 name BGP-Advertisement
ip flow-export source GigabitEthernet0/1
ip flow-export version 5 origin-as
!
no ip http server
!
!
!
ip prefix-list DEFAULT seq 10 permit 0.0.0.0/0
!
ip prefix-list WALTER-SUBNET seq 5 permit 10.20.30.0/24
ip prefix-list WALTER-SUBNET seq 10 deny 0.0.0.0/0 le 32
!
route-map ISP_B_IMPORT permit 10
 match ip address prefix-list DEFAULT
!
route-map prepending permit 10
 match ip address prefix-list DEFAULT

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