Hello,
I know that route injection let us to insert prefixes more specific withouth appear in the routing table. Now I am practising but isn't working fine.
The steps are:
- Configure a prefix-list listing all more-specific prefixes
- Configure a ROUTE-MAP using the prefix-list of above
- Configure a second prefix-list with aggregate prefix
- Configure a thirth prefix-list to matching the advertising-router of all more-specific prefixes.
- Second ROUTE-MAP using the second and thirth prefix-lists.
- Finally use both ROUTE-MAPS with this syntax:
bgp inject-map HOSTS exist-map SUBNET copy-attributes
So I will summarize on R2 Device and will configured Route-Injection on R3 devices. At the end I will go to R4 device to verify that works.
R2
Loopback1 10.10.10.1 YES NVRAM up up
Loopback2 10.10.10.129 YES NVRAM up up
Loopback3 10.10.11.1 YES manual up up
Loopback4 10.10.12.1 YES manual up up
R2#sh ru | s bgp
router bgp 123
no synchronization
bgp log-neighbor-changes
network 1.1.1.1 mask 255.255.255.255
aggregate-address 10.10.8.0 255.255.248.0 summary-only
redistribute connected
neighbor my-group peer-group
neighbor 1.1.1.1 remote-as 123
neighbor 1.1.1.1 peer-group my-group
neighbor 1.1.1.1 password 7 1414110209
neighbor 1.1.1.1 update-source Loopback0
neighbor 3.3.3.3 remote-as 123
neighbor 3.3.3.3 peer-group my-group
neighbor 3.3.3.3 password 7 0458080F0A
neighbor 3.3.3.3 update-source Loopback0
no auto-summary
R3
router bgp 123
no synchronization
bgp log-neighbor-changes
bgp inject-map HOSTS exist-map SUBNET copy-attributes
neighbor 2.2.2.2 remote-as 123
neighbor 2.2.2.2 password 7 1511080501
neighbor 2.2.2.2 update-source Loopback0
neighbor 4.4.4.4 remote-as 45
neighbor 4.4.4.4 disable-connected-check
neighbor 4.4.4.4 update-source Loopback0
no auto-summary
ip prefix-list AGGREGATE seq 5 permit 10.10.8.0/21
!
ip prefix-list HOSTS seq 5 permit 10.10.10.0/24
ip prefix-list HOSTS seq 10 permit 10.10.11.0/24
!
ip prefix-list adv-router seq 5 permit 172.26.1.1/32 //IP of neighbor R2
ip prefix-list adv-router seq 10 permit 2.2.2.2/32//IP of neighbor R2 (loopback)
route-map SUBNET permit 10
match ip address prefix-list AGGREGATE
match ip route-source prefix-list adv-router
!
route-map HOSTS permit 10
match ip address prefix-list HOSTS
I keep on without see the HOSTS prefixes (more specific). I have already restart the BGP sessions without success.
R4#show ip bgp
BGP table version is 56, 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
*> 1.1.1.1/32 3.3.3.3 0 123 i
*> 2.2.2.2/32 3.3.3.3 0 123 ?
*> 10.10.8.0/21 3.3.3.3 0 123 i
*> 172.26.1.0/30 3.3.3.3 0 123 ?
*> 172.26.1.4/30 3.3.3.3 0 123 ?
Best regards,
