thanks eric for all your efforts . i love you man . btw,my real name is Mohamed i`m 36 years old from Egypt.
RFC 2328 - This is an update to OSPFv2, this changes routes to ASBRs to prefer intra-area routes to avoid backbone area congestion. This was released in 1998
Q1. what do you means when you said “this changes routes to ASBRs to prefer intra-area routes to avoid backbone area congestion” ?
are you referring to in RFC2328 they mentioned if the ABR R1 received external LSA and received the same LSA from the intra-area he would prefer the inter-area LSA ? and if that is the case ,in RFC 2328 they said they modified things in RFC 1583 and put it in RFC 2328 , but what did they said in RFC1583 about that same situation ?
Now, it’s worth noting, the changes in RFC 2328 have a conflict with NSSA pathing as described in RFC 1587, if a device is configured for compatibility with both RFC 1587 and RFC 2328, 2328 will take precedence and change the expected pathing.
why did you mentioned both RFC2328 and RFC 1587 if both are away from each others and both are not supporting the same thing . one is supporting NSSA only (which is RFC 1587) and the other is supporting another different thing (which is RFC 2328) i`m stilll not understanding this point.
Cisco is compatible with RFC 1583 by default, not RFC 2328. Other vendors, like Palo, are compatible with the more modern RFC 2328 by default. Cisco is also compatible with RFC 3101 by default.
Q2. also the same thing , you compared somthings is not related to each other .
look, what i understand is
RFC 1583 has been deprecated by RFC 2328 . both are talking about the SPF and how the intra,inter,external LSAs are working .but not including the NSSA topics.
RFC 1587 has been deprecated by RFC 3101 . both are talking about NSSA things only .
so, let`s say RFC 1583 is not related to RFC 2328 .
and the RFC 1587 is not related to RFC3101.
Q3. you said
Cisco is compatible with RFC 1583 by default, not RFC 2328
but how did you know that ?
R1(config)#router ospf 1
rfc1583 compatible with RFC 1583
rfc1587 compatible with RFC 1587
t see RFC 2328 in these choice .also i dont see RFC 3101 in the choice .why ?