OSPF LSAs

[chuck.price]

I was wondering why there were no Type 6 LSAs in OSPF. The Types range from 1-7 skipping 6. I know this is not a crtical question, I just want to know for curiosity's sake.

Thanks

[donewald · Accepted solution]

Acutally there are type 6 LSA's. They are defined in RFC 1584. LS type = 6 group-membership-LSA

They are used in MOSPF for Multicast. See the RFC at

http://www.faqs.org/rfcs/rfc1584.html

Regards,

Don Ewald

[ruwhite]

There are type 6 LSAs in OSFP--in fact, there's everything up to 12 or 13, but I'd have to go look to know what the last one is. I know these:

1 -- router (including stub links attached to this router, and connected neighbors, other than those on broadcast links)

2 -- network (actually a node representing a network)

3 -- summary lsa (not an ip address summary, necessarily)

4 -- border router (originated by an ABR, to show where a type 5 within an area is originated to routers outside the area)

5 -- external

6 -- multicast route (no vendors support this at the moment, that I know of, though old Bay/Proteon stuff did, and thus Nortel might)

7 -- nssa external, converted to type 5 at an ABR

Above here are opaques, and one experimental one, but Cisco really doesn't support any of them, except for some of the opaque stuff.

Hope that helps....

Russ.W

[chuck.price]

It sure does. Thanks to both of you. I never thought to look to MOSPF to find the LSA.