10-29-2013 07:20 AM - edited 03-01-2019 05:42 PM
Hello,
I have 2 questions concerning OSPFv3 with Address-Family (RFC 6969/5838):
1) Does the OSPFv3 IPv4 address family can establish directly a neighbour relationship with an OSPFv2 (IPv4) node (without redisbribution) ?
2) Does the "old" OSPFv3 based on RFC 5240 (without address family support) can establish directly a neighbour relationship with an OSPFv3 node based on RFC 6969/5838 (i'm talking of IPv6-only node of course) ?
Best regards,
---
Martin
Solved! Go to Solution.
10-29-2013 11:43 AM
Hi Martin,
1) Does the OSPFv3 IPv4 address family can establish directly a neighbour relationship with an OSPFv2 (IPv4) node (without redisbribution) ?
2) Does the "old" OSPFv3 based on RFC 5240 (without address family support) can establish directly a neighbour relationship with an OSPFv3 node based on RFC 6969/5838 (i'm talking of IPv6-only node of course) ?
When an OSPFv3 router participates in an AF (sets the AF-bit in the Options field), it MUST discard Hello packets having the AF- bit clear in the Options field. The only exception is the Base IPv6 unicast AF, where this check MUST NOT be done (for backward compatibility).
If someone have it tried and see a different behaviour, they can comment
HTH,
Nagendra
10-29-2013 05:00 PM
Salut Martin,
As Nagendra pointed out, RFC5838 is backward compatible and will therefore interoperate with previous versions of ospfv3 that support ipv6 unicast only.
Regards
10-29-2013 11:43 AM
Hi Martin,
1) Does the OSPFv3 IPv4 address family can establish directly a neighbour relationship with an OSPFv2 (IPv4) node (without redisbribution) ?
2) Does the "old" OSPFv3 based on RFC 5240 (without address family support) can establish directly a neighbour relationship with an OSPFv3 node based on RFC 6969/5838 (i'm talking of IPv6-only node of course) ?
When an OSPFv3 router participates in an AF (sets the AF-bit in the Options field), it MUST discard Hello packets having the AF- bit clear in the Options field. The only exception is the Base IPv6 unicast AF, where this check MUST NOT be done (for backward compatibility).
If someone have it tried and see a different behaviour, they can comment
HTH,
Nagendra
10-29-2013 11:57 AM
Thank you Nagendra,
This is really interesting, i just realized that even using IPv4 Address family in OSPFv6, hello packet are still sent to an IPv6 multicast address...
Regards,
10-29-2013 05:00 PM
Salut Martin,
As Nagendra pointed out, RFC5838 is backward compatible and will therefore interoperate with previous versions of ospfv3 that support ipv6 unicast only.
Regards
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