[c-nsp] IPv6 iBGP Route Reflector
Aleksandr Gurbo
kron at linkey.ru
Thu Jul 9 14:17:39 EDT 2009
> > rtr4#show ip bgp ipv6 unicast 2001:1020:100::3/128
> > BGP routing table entry for 2001:1020:100::3/128, version 0
> > Paths: (1 available, no best path)
> > Not advertised to any peer
> > Local, (received & used)
> > 2001:1020:100::3 (inaccessible) from 2001:1020:100::2 (10.10.1.14)
> ^^^^^^^^^^^^^^
>
> I don't know for sure, but this seems like a reachability problem, not
> necessarily a BGP problem.
Yes, you are partially right, but rtr3 can reach rtr4.
rtr3#sh ipv6 route
IPv6 Routing Table - 10 entries
Codes: C - Connected, L - Local, S - Static, R - RIP, B - BGP
U - Per-user Static route
I1 - ISIS L1, I2 - ISIS L2, IA - ISIS interarea, IS - ISIS summary
O - OSPF intra, OI - OSPF inter, OE1 - OSPF ext 1, OE2 - OSPF ext 2
ON1 - OSPF NSSA ext 1, ON2 - OSPF NSSA ext 2
O 2001:1020:100::2/128 [110/1]
via FE80::21F:CAFF:FEB3:640, FastEthernet6/1/0
LC 2001:1020:100::3/128 [0/0]
via ::, Loopback0
O 2001:1020:100::4/128 [110/2]
via FE80::21F:CAFF:FEB3:640, FastEthernet6/1/0
C 2001:1020:700::/64 [0/0]
via ::, FastEthernet6/0/0
L 2001:1020:700::1/128 [0/0]
via ::, FastEthernet6/0/0
C 2001:1020:7000::/64 [0/0]
via ::, FastEthernet6/1/0
L 2001:1020:7000::1/128 [0/0]
via ::, FastEthernet6/1/0
O 2001:1020:8000::/64 [110/2]
via FE80::21F:CAFF:FEB3:640, FastEthernet6/1/0
L FE80::/10 [0/0]
via ::, Null0
L FF00::/8 [0/0]
via ::, Null0
rtr3#ping 2001:1020:100::4
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 2001:1020:100::4, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 0/1/4 ms
> The next-hop should appear valid and usable, and link-local is a valid
> next-hop in your case. eg:
>
> O>* 2607:f118:1::e3/128 [110/2] via fe80::21a:70ff:fe14:568a, em5, 05w2d23h
>
> Can r2 reach r3? Can you provide some relevant BGP and OSPF config snips
> from r2 and r4?
> I have a network segment that is configured nearly identical to yours,
> so I can compare config pieces with you if you'd like.
Yes, rtr2_RR can reach rtr3 and rtr4.
rtr2_RR#ping 2001:1020:100::3
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 2001:1020:100::3, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 0/0/0 ms
rtr2_RR#sh ipv6 route
IPv6 Routing Table - default - 10 entries
Codes: C - Connected, L - Local, S - Static, U - Per-user Static route
B - BGP, R - RIP, I1 - ISIS L1, I2 - ISIS L2
IA - ISIS interarea, IS - ISIS summary, D - EIGRP, EX - EIGRP external
O - OSPF Intra, OI - OSPF Inter, OE1 - OSPF ext 1, OE2 - OSPF ext 2
ON1 - OSPF NSSA ext 1, ON2 - OSPF NSSA ext 2
LC 2001:1020:100::2/128 [0/0]
via Loopback12, receive
O 2001:1020:100::3/128 [110/1]
via FE80::260:2FFF:FE4E:41C8, GigabitEthernet3/24
O 2001:1020:100::4/128 [110/1]
via FE80::230:96FF:FEC0:A880, GigabitEthernet3/23
B 2001:1020:700::/64 [200/0]
via 2A00:1020:100::3, indirectly connected
B 2001:1020:800::/64 [200/0]
via 2A00:1020:100::4, indirectly connected
C 2001:1020:7000::/64 [0/0]
via GigabitEthernet3/24, directly connected
L 2001:1020:7000::2/128 [0/0]
via GigabitEthernet3/24, receive
C 2001:1020:8000::/64 [0/0]
via GigabitEthernet3/23, directly connected
L 2001:1020:8000::2/128 [0/0]
via GigabitEthernet3/23, receive
L FF00::/8 [0/0]
via Null0, receive
configuration rtr2_RR:
interface Loopback12
no ip address
ipv6 address 2001:1020:100::2/128
ipv6 ospf 333 area 0
end
interface GigabitEthernet3/23
description rtr4
no ip address
ipv6 address 2001:1020:8000::2/64
ipv6 enable
ipv6 ospf 333 area 0
mpls ip
end
interface GigabitEthernet3/24
description rtr3
no ip address
ipv6 address 2001:1020:7000::2/64
ipv6 enable
ipv6 ospf 333 area 0
mpls ip
end
router bgp 65000
template peer-policy rr-clients-v6
route-reflector-client
soft-reconfiguration inbound
send-community both
send-label
exit-peer-policy
!
bgp router-id 10.10.1.14
bgp log-neighbor-changes
neighbor 2001:1020:100::3 remote-as 65000
neighbor 2001:1020:100::3 ebgp-multihop 10
neighbor 2001:1020:100::3 update-source Loopback12
neighbor 2001:1020:100::4 remote-as 65000
neighbor 2001:1020:100::4 ebgp-multihop 10
neighbor 2001:1020:100::4 update-source Loopback12
!
address-family ipv4
no synchronization
neighbor 2001:1020:100::3 activate
neighbor 2001:1020:100::4 activate
no auto-summary
exit-address-family
!
address-family ipv6
redistribute connected
no synchronization
neighbor 2001:1020:100::3 activate
neighbor 2001:1020:100::3 inherit peer-policy rr-clients-v6
neighbor 2001:1020:100::4 activate
neighbor 2001:1020:100::4 inherit peer-policy rr-clients-v6
exit-address-family
ipv6 router ospf 333
router-id 192.168.201.14
log-adjacency-changes
passive-interface default
no passive-interface GigabitEthernet3/23
no passive-interface GigabitEthernet3/24
!
configuration rtr4:
interface Loopback0
no ip address
ipv6 address 2001:1020:100::4/128
ipv6 enable
ipv6 ospf 333 area 0
interface FastEthernet4/0/0
description rtr2_RR
no ip address
full-duplex
ipv6 address 2001:1020:8000::1/64
ipv6 enable
no ipv6 redirects
ipv6 ospf 333 area 0
mpls ip
interface FastEthernet5/0/0
description IPv6net2
no ip address
full-duplex
ipv6 address 2001:1020:800::1/64
router bgp 65000
bgp log-neighbor-changes
neighbor 2001:1020:100::2 remote-as 65000
neighbor 2001:1020:100::2 update-source Loopback0
!
address-family ipv4
neighbor 2001:1020:100::2 activate
no auto-summary
no synchronization
exit-address-family
!
address-family ipv6
neighbor 2001:1020:100::2 activate
neighbor 2001:1020:100::2 send-community both
neighbor 2001:1020:100::2 soft-reconfiguration inbound
neighbor 2001:1020:100::2 send-label
redistribute connected
no synchronization
exit-address-family
ipv6 router ospf 333
router-id 192.168.153.2
log-adjacency-changes
passive-interface default
no passive-interface FastEthernet4/0/0
Configuration on rtr3 like rtr4.
--
Alexandr Gurbo
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