I went back and took another look at his video and he alludes to the answer at around 1:35 (1 hour, 35 minute) ( https://www.ciscolive.com/global/on-demand-library/?search=BRKRST%203320#/video/1519328378542002IVEW ).
The Challenge:
The Solution:
The Configs:
R1:
hostname R1 interface Loopback100 ip address 100.1.1.1 255.255.255.255 interface FastEthernet0/0 description "To R2" ip address 10.1.12.1 255.255.255.0 router bgp 100 bgp log-neighbor-changes network 100.1.1.1 mask 255.255.255.255 neighbor 10.1.12.2 remote-as 200 |
R2:
hostname R2 interface FastEthernet0/0 description "To R1" ip vrf forwarding 200 ip address 10.1.12.2 255.255.255.0 interface FastEthernet1/0 description "To R3" ip vrf forwarding 200 ip address 10.1.23.2 255.255.255.0 router bgp 200 bgp log-neighbor-changes neighbor 10.1.12.1 remote-as 100 neighbor 10.1.23.3 remote-as 200 neighbor 10.1.23.3 next-hop-self |
R3:
hostname R3 interface FastEthernet0/0 description "To R4" ip address 10.1.34.3 255.255.255.0 interface FastEthernet1/0 description "To R2" ip address 10.1.23.3 255.255.255.0 router bgp 200 bgp log-neighbor-changes bgp inject-map INJECT exist-map EXIST neighbor 10.1.23.2 remote-as 200 neighbor 10.1.34.4 remote-as 200 neighbor 10.1.34.4 route-reflector-client ip prefix-list LEARNED seq 5 permit 100.1.1.1/32 ip prefix-list NEIGHBOR seq 5 permit 10.1.23.2/32 ip prefix-list ORIGINATE seq 5 permit 100.1.1.1/32 route-map INJECT permit 10 set ip address prefix-list ORIGINATE set ip next-hop 10.1.34.3 route-map EXIST permit 10 match ip address prefix-list LEARNED match ip route-source prefix-list NEIGHBOR Verify:R3#sho ip bgp injected-paths BGP table version is 3, local router ID is 10.1.34.3 Status codes: s suppressed, d damped, h history, * valid, > best, i - internal, r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter, x best-external, a additional-path, c RIB-compressed, Origin codes: i - IGP, e - EGP, ? - incomplete RPKI validation codes: V valid, I invalid, N Not found Network Next Hop Metric LocPrf Weight Path *>i 100.1.1.1/32 10.1.34.3 0 ? R3#sho ip bgp BGP table version is 3, local router ID is 10.1.34.3 Status codes: s suppressed, d damped, h history, * valid, > best, i - internal, r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter, x best-external, a additional-path, c RIB-compressed, Origin codes: i - IGP, e - EGP, ? - incomplete RPKI validation codes: V valid, I invalid, N Not found Network Next Hop Metric LocPrf Weight Path *>i 100.1.1.1/32 10.1.34.3 0 ? * i 10.1.23.2 0 100 0 100 i |
R4:
hostname R4 interface FastEthernet0/0 description "To R3" ip address 10.1.34.4 255.255.255.0 interface FastEthernet1/0 description "To R5" ip address 10.1.45.4 255.255.255.0 router bgp 200 bgp log-neighbor-changes neighbor 10.1.34.3 remote-as 200 neighbor 10.1.45.5 remote-as 300 Verify:R4#sho ip bgp BGP table version is 2, local router ID is 10.1.45.4 Status codes: s suppressed, d damped, h history, * valid, > best, i - internal, r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter, x best-external, a additional-path, c RIB-compressed, Origin codes: i - IGP, e - EGP, ? - incomplete RPKI validation codes: V valid, I invalid, N Not found Network Next Hop Metric LocPrf Weight Path *>i 100.1.1.1/32 10.1.34.3 100 0 ? |
R5:
hostname R5 interface FastEthernet1/0 description "To R4" ip address 10.1.45.5 255.255.255.0 router bgp 300 bgp log-neighbor-changes neighbor 10.1.45.4 remote-as 200 R5 - Verify:R5#sho ip bgp BGP table version is 2, local router ID is 10.1.45.5 Status codes: s suppressed, d damped, h history, * valid, > best, i - internal, r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter, x best-external, a additional-path, c RIB-compressed, Origin codes: i - IGP, e - EGP, ? - incomplete RPKI validation codes: V valid, I invalid, N Not found Network Next Hop Metric LocPrf Weight Path *> 100.1.1.1/32 10.1.45.4 0 200 ? R5# |
