BGP Backdoor work with EBGP
Note:
1. The EBGP is by Default preferred routing path as compare to other routing Protocol.
2. BGP backdoor will preferred if we use the command BGP backdoor in BGP routing.
3. The BGP routing table should match with Network statement.
4. Summary route should not use. The recommended is use particuler route.
5. Other IGP routing will prefer if we use BGP backdoor command.
6. EIGRP is most usable in Backdoor (recommended). Some other open standard OSPF could have problem in some Cisco IOS , you have to check the cisco IOS compatibility.
7. Using my EIGRP Green link for Backdoor network
----------------------------------------R1-------------------------------
router eigrp 100
network 172.22.1.253 0.0.0.0
network 10.10.10.128 0.0.0.3
network 11.11.11.11 0.0.0.0
redistribute static route-map ONK
!
router bgp 65001
no synchronization
bgp log-neighbor-changes
network 10.10.11.0 mask 255.255.255.0
network 172.23.3.64 mask 255.255.255.192 backdoor
network 172.23.3.128 mask 255.255.255.128 backdoor
network 172.25.94.0 mask 255.255.255.192
network 172.31.102.1 mask 255.255.255.255
neighbor 10.10.10.17 remote-as 10201
neighbor 10.10.10.17 description ISP-1 MPLS PE router
neighbor 10.10.10.17 allowas-in
neighbor 172.22.1.252 remote-as 65001
neighbor 172.22.1.252 description 1841 IBGP Peer
neighbor 172.22.1.252 next-hop-self
route-map ONK permit 10
match ip address 16
access-list 16 permit 172.22.11.128 0.0.0.127
access-list 16 permit 172.22.18.0 0.0.0.127
-------------------------------------------------------
----------------------------R2-----------------------
!
router eigrp 100
network 10.10.10.128 0.0.0.3
network 22.22.22.22 0.0.0.0
network 172.22.1.252 0.0.0.0
redistribute static route-map ONK
!
router bgp 65001
no synchronization
bgp log-neighbor-changes
network 10.10.11.0 mask 255.255.255.0
network 172.23.3.64 mask 255.255.255.192 backdoor
network 172.23.3.128 mask 255.255.255.128 backdoor
network 172.25.94.0 mask 255.255.255.192
network 172.31.102.2 mask 255.255.255.255
neighbor 172.22.1.253 remote-as 65001
neighbor 172.22.1.253 description 2811 IBGP Peer
neighbor 172.22.1.253 next-hop-self
neighbor 172.34.87.185 remote-as 9730
neighbor 172.34.87.185 description ISP-2 MPLS PE router
neighbor 172.34.87.185 allowas-in
no auto-summary
route-map ONK permit 10
match ip address 16
access-list 16 permit 172.22.11.128 0.0.0.127
access-list 16 permit 172.22.18.0 0.0.0.127
----------------------------------R3----------------------------
router eigrp 100
redistribute static route-map ONK
network 33.33.33.33 0.0.0.0
network 172.23.0.252 0.0.0.0
no auto-summary
!
router bgp 65001
no synchronization
bgp log-neighbor-changes
network 172.22.11.128 mask 255.255.255.128 backdoor
network 172.22.18.0 mask 255.255.255.128 backdoor
network 172.31.106.1 mask 255.255.255.255
neighbor 10.0.0.5 remote-as 10201
neighbor 10.0.0.5 description ISP-1 MPLS PE Router
neighbor 10.0.0.5 allowas-in
neighbor 172.23.0.253 remote-as 65001
neighbor 172.23.0.253 description 2811 IBGP Peer
neighbor 172.23.0.253 next-hop-self
no auto-summary
route-map ONK permit 10
match ip address 16
access-list 16 permit 172.23.3.64 0.0.0.63
access-list 16 permit 172.23.3.128 0.0.0.127
----------------------------------R4---------------
router eigrp 100
network 10.10.10.128 0.0.0.3
network 172.23.0.253 0.0.0.0
redistribute static route-map ONK
!
router bgp 65001
no synchronization
bgp log-neighbor-changes
network 3.8.8.8 mask 255.255.255.255
network 172.22.11.128 mask 255.255.255.128 backdoor
network 172.22.18.0 mask 255.255.255.128 backdoor
network 172.23.88.0 mask 255.255.255.0
network 172.31.106.1 mask 255.255.255.255
neighbor 172.23.0.252 remote-as 65001
neighbor 172.23.0.252 description 1841 IBGP Peer
neighbor 172.23.0.252 next-hop-self
neighbor 172.34.125.21 remote-as 9730
neighbor 172.34.125.21 description ISP-2 MPLS PE router
neighbor 172.34.125.21 allowas-in
no auto-summary
!
route-map ONK permit 10
match ip address 16
access-list 16 permit 172.23.3.64 0.0.0.63
access-list 16 permit 172.23.3.128 0.0.0.127
match ip address 16
!
BGP Backdoor work with EBGP
