OSPFv3 AF NSSA conditional default route injection

[Jacob Zartmann]

Hi,

I'm deploying OSPFv3 AF and have trouble injecting a default route (conditionally) with a NSSA. I'm trying to do this on a CE as we have firewalls connected here.

The below scenario works with OSPFv2 by the way.

The basic configuration is this:

!PE:
 

ipv6 unicast-routing
!
interface FastEthernet1/0
 ip address 10.0.12.1 255.255.255.0
 speed auto
 duplex auto
 ipv6 enable
 ospfv3 12 ipv6 area 12
!
router ospfv3 12
 !
 address-family ipv6 unicast
  area 12 nssa
 exit-address-family
!

!CE:
ipv6 unicast-routing
!
interface FastEthernet1/0
 description -> PE
 ip address 10.0.12.2 255.255.255.0
 speed auto
 duplex auto
 ipv6 enable
 ospfv3 12 ipv6 area 12
!
router ospfv3 12
 !
 address-family ipv6 unicast
  area 12 nssa default-information-originate
 exit-address-family
!
ipv6 route ::/0 Null0

! CE show outputs:

CE#sh ospfv3 12 ipv6 nei

          OSPFv3 12 address-family ipv6 (router-id 2.2.2.2)

Neighbor ID     Pri   State           Dead Time   Interface ID    Interface
1.1.1.1           1   FULL/BDR        00:00:34    3               FastEthernet1/0
CE#sh ospfv3 12 ipv6 data

          OSPFv3 12 address-family ipv6 (router-id 2.2.2.2)

        Router Link States (Area 12)

ADV Router       Age         Seq#        Fragment ID  Link count  Bits
 1.1.1.1         389         0x80000002  0            1           None
 2.2.2.2         388         0x80000003  0            1           E

        Net Link States (Area 12)

ADV Router       Age         Seq#        Link ID    Rtr count
 2.2.2.2         388         0x80000001  3          2

        Link (Type-8) Link States (Area 12)

ADV Router       Age         Seq#        Link ID    Interface
 1.1.1.1         397         0x80000002  3          Fa1/0
 2.2.2.2         448         0x80000002  3          Fa1/0
CE#

! PE show output:

PE#sh ipv6 route
IPv6 Routing Table - default - 1 entries
Codes: C - Connected, L - Local, S - Static, U - Per-user Static route
       B - BGP, R - RIP, H - NHRP, I1 - ISIS L1
       I2 - ISIS L2, IA - ISIS interarea, IS - ISIS summary, D - EIGRP
       EX - EIGRP external, ND - ND Default, NDp - ND Prefix, DCE - Destination
       NDr - Redirect, O - OSPF Intra, OI - OSPF Inter, OE1 - OSPF ext 1
       OE2 - OSPF ext 2, ON1 - OSPF NSSA ext 1, ON2 - OSPF NSSA ext 2, l - LISP
L   FF00::/8 [0/0]
     via Null0, receive
PE#

If I do a redist connected on the CE, it clears the P-bit and I see a default route (unconditionally) on the PE:

*Apr 14 08:42:31.855: %OSPFv3-4-NSSA_NO_FA: OSPF process 12 lacks forwarding address for type 7 LSA 0.0.0.0 in NSSA 12 - P-bit cleared

Now on the PE I see:

PE#sh ipv6 route
IPv6 Routing Table - default - 2 entries
Codes: C - Connected, L - Local, S - Static, U - Per-user Static route
       B - BGP, R - RIP, H - NHRP, I1 - ISIS L1
       I2 - ISIS L2, IA - ISIS interarea, IS - ISIS summary, D - EIGRP
       EX - EIGRP external, ND - ND Default, NDp - ND Prefix, DCE - Destination
       NDr - Redirect, O - OSPF Intra, OI - OSPF Inter, OE1 - OSPF ext 1
       OE2 - OSPF ext 2, ON1 - OSPF NSSA ext 1, ON2 - OSPF NSSA ext 2, l - LISP
ON2 ::/0 [110/1]
     via FE80::C803:5FF:FEAC:1C, FastEthernet1/0
L   FF00::/8 [0/0]
     via Null0, receive
PE#

The question is:

How do I conditionally inject a default route with OSPFv3 AF NSSA?

Thanks

/JZ

[luckymike33]

Hi,

A quick check of the config guide shows that their examples of default origination in OSPFv3 use the 'default information-originate' command, this can be tied in with a route-map, in order to match a certain condition. i.e. statement is configured under the process, not using the 'area' command.

1. create prefix -list matching routes (these form the matching condition)

2. create a route-map - with a permit statement matching the prefix-list.

3. default information-originate route-map [map name]

HTH

Mike

[Jacob Zartmann]

Hi Mike,

Thanks for your input. Could you please send me a link to the source of this information?

I'm looking here and see no such example.

Best regards,

/JZ

[luckymike33]

Hi,

This may be my mistake - I enclose a link to the command reference for the IOS image I found this from, it is an IOS-XML version.

http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipv6/command/ipv6-cr-book/ipv6-d2.html#wp3802563151

Sorry if I have confused this matter.

Very best wishes

Mike