[c-nsp] IPv6 BGP on IOS-XR

[Koch, Andrew]

You will need to get the /32 into BGP first.  Then you can let it out the peering session.

1. A matching IGP route must exist.  Most networks will use an anchor route for their aggregate.  You can also have a matching IGP route of exact same prefix length.
router static
 address-family ipv6 unicast
  2001:db8::/32 Null0 254 description anchor_route

2. Network statement to get route into BGP (unless redistributing IGP route into BGP)
router bgp 65526
 address-family ipv6 unicast
  network 2001:db8::/32

3. Ensure you see your own route in the local BGP table
RP/0/RP1/CPU0:Router#show bgp ipv6 unicast 2001:db8::/32
BGP routing table entry for 2001:db8::/32
Versions:
  Process           bRIB/RIB  SendTblVer
  Speaker                  2           2
Paths: (1 available, best #1)
  Advertised to update-groups (with more than one peer):
    0.3 0.4
  Path #1: Received by speaker 0
  Local
    :: from :: (192.0.2.1)
      Origin IGP, metric 0, localpref 100, weight 32768, valid, local, best
RP/0/RP1/CPU0:Router#


4. Set some type of route-policy to allow your block out to peers
prefix-set OUT-v6
  2001:db8::/32
end-set

route-policy ALLOW-OUT-v6
  if destination in OUT-v6 then
    pass
  else
    drop
  endif
end-policy

5. Finally, Set policy to allow prefix out on your session
router bgp 65526
neighbor 2001:db8:ffff::50
  remote-as 65525
  description My-Peer
  address-family ipv6 unicast
   route-policy ALLOW-OUT-v6 out



Keep in mind that this is a very simplified example.  You should make sure to take proper precautions when exchanging routes.  This includes preventing martian prefixes from being exchanged, any other type of route tagging, filtering, max-prefix protections, etc.

This IOS-XR software installation and configuration guide page should be kept handy for reference - look for your equipment type, release and general topic.  In this case look for the routing configuration guide.
http://www.cisco.com/en/US/products/ps5845/products_installation_and_configuration_guides_list.html

HTH,
Andy