Kevin Dorrell, CCIE #20765

04 May 2008

IPv6 – Redistributing BGP <–> OSPF

Filed under: IPv6, IPv6 BGP, IPv6 OSPFv3 — dorreke @ 15:42

In the NMC Sample lab, R1 is an IPv6 border router between OSPF and BGP. It has a loopback interface on R1-Lo100, FEC0::1111:1/125, which is part of the BGP domain by virtue of:

address-family ipv6
neighbor FE80::3333:3333 activate
neighbor FE80::3333:3333 route-map NH-out out
network FEC0::1111:0/125

R1 forms its peer relationship with R3 as it should, and picks up prefixes from there, which it redistributes into OSPF:

R1#show run | sec ipv6 router ospf
ipv6 router ospf 1
router-id 172.16.10.1
log-adjacency-changes
area 13 virtual-link 172.16.130.1
redistribute bgp 100 metric 20 include-connected

But what about that include-connected? Shouldn’t that get our FEC0::1111:0/125 route into OSPF? Apparently not. I found it necessary to do a redistribute connected as well.

R1#show run | sec ipv6 router ospf
ipv6 router ospf 1
router-id 172.16.10.1
log-adjacency-changes
area 13 virtual-link 172.16.130.1
redistribute connected
redistribute bgp 100 metric 20 include-connected

Conclusion? When redistributing IPv6 BGP into OSPF, the include-connected keyword does not seem to work.

I had an issue going the other way too: OSPF–>BGP. It seems it is not enough just to redistribute:

address-family ipv6
neighbor FE80::3333:3333 activate
neighbor FE80::3333:3333 route-map NH-out out
network FEC0::1111:0/125
redistribute ospf 1 include-connected
no synchronization
exit-address-family

You need to specify what to redistribute:

address-family ipv6
neighbor FE80::3333:3333 activate
neighbor FE80::3333:3333 route-map NH-out out
network FEC0::1111:0/125
redistribute ospf 1 match internal external 1 external 2 include-connected
no synchronization
exit-address-family

I want to look these behaviors up in the Command Reference, but for some reason I cannot find the IPv6 Command Reference documents on the Cisco web site.  I can find the Configuration Guide OK, but not the Command References.  I wrote to their HelpLine about it.

 

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NMC Sample lab

Filed under: BGP, IPv6, IPv6 BGP — dorreke @ 10:18

Since we had a couple of holidays this week (week 18), and having given up on lab 18, I thought I would have a go at the sample lab.  Being a showpiece, I thought it might be interesting and representative.

  • S7.7 – BGP auto-summary
     
  • S.8 – In IPv6, redistribute ospf 1 include-connected does not redistribute the externals by default.  You have to do redistribute ospf 1 match internal external 1 external 2 include-connected.
     
  • S.8 – Learned the proper syntax for ipv6 BGP validation commands (instead of guessing) 
    • show bgp ipv6 unicast
    • show bgp ipv6 unicast summary
    • show bgp ipv6 unicast neighbor
       
  • S.8 – IPv6 – Redistributing BGP <–> OSPF

 

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