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Hi, As per RFC-5340 (4.4.3.9) during Intra-area-prefix
LSA origination by DR, it should check the Neighbor’s state and
interface-id, in order to copy the list of prefixes from the Link-LSA into intra-area-prefix
LSA. But there is a conflicting statement in the RFC for
Intra-area-prefix LSA generation in the RFC section (4.4.3.9)
and (4.9). In 4.4.3.9 Section:: Intra-area-prefix
LSA If router 'A' has multiple
interfaces on the link and router 'B' is DR for the link, then according to
RFC, prefixes in link-LSA associated with standby interface will not
be included in intra-area-prefix LSA generated by DR 'B' for the link, because
Link state ID of standby interface's Link-LSA will not match neighbor's(A)
interface ID. Each link-LSA associated
with Link L is examined (these are in the Designated Router's
interface structure for Link L). If the link- LSA's Advertising Router is
fully adjacent to the Designated Router and the Link State ID
matches the neighbor's interface ID, the list of prefixes in the
link-LSA is copied into the intra- area-prefix-LSA that is
being built. In 4.9 Section:: Intra-area-prefix
LSA generation for prefixes on standby interface Prefixes on Standby
Interfaces will be processed the same way as prefixes on the Active
Interface. For example, if the router is the DR for the link, the
Active Interface's prefixes are included in an intra-area-prefix-LSA
which is associated with the Active Interface's network-LSA,
prefixes from Standby Interfaces on the link will also be included
in that intra-area-prefix LSA. ---RFC
5340 (4.9) --- |