OSPF LSA's: What is type 9?

Deathmage

Ok,

So I know the following:

1 - Router
2 - DR
3 - ABR
4 - ASBR
5 - External Networks in same domain
7 - External Networks from External domain
9 - what is this????

not messing around, next ICDN2 I will now as much about L2 as I can....

james43026

This article may help.

mikeybinec

Rick Graziani of Cisco Press refers to them as "Opaque LSAs"


I keep seeing the word "link-local" when referring to them but it never mentions IPv6



RFC 5250 - The OSPF Opaque LSA Option




The Opaque LSA


Opaque LSAs are types 9, 10, and 11 link state advertisements.
Opaque LSAs consist of a standard LSA header followed by a 32-bit
aligned application-specific information field. Standard link-state
database flooding mechanisms are used for distribution of Opaque
LSAs. The range of topological distribution (i.e., the flooding
scope) of an Opaque LSA is identified by its link-state type. This
section documents the flooding of Opaque LSAs.


The flooding scope associated with each Opaque link-state type is
defined as follows.


o Link-state type-9 denotes a link-local scope. Type-9 Opaque LSAs
are not flooded beyond the local (sub)network.


o Link-state type-10 denotes an area-local scope. Type-10 Opaque
LSAs are not flooded beyond the borders of their associated area.


o Link-state type-11 denotes that the LSA is flooded throughout the
Autonomous System (AS). The flooding scope of type-11 LSAs are
equivalent to the flooding scope of AS-External (type-5) LSAs.
Specifically, type-11 Opaque LSAs are 1) flooded throughout all
transit areas, 2) not flooded into stub areas or Not-So-Stubby
Areas (NSSAs), see [NSSA], from the backbone, and 3) not
originated by routers into their connected stub areas or NSSAs.
As with type-5 LSAs, if a type-11 Opaque LSA is received in a stub
area or NSSA from a neighboring router within the stub area or
NSSA, the LSA is rejected.


The link-state ID of the Opaque LSA is divided into an Opaque type
field (the first 8 bits) and a type-specific ID (the remaining 24
bits). The packet format of the Opaque LSA is given in Appendix A.
Section 7 describes Opaque type allocation and assignment.


The responsibility for proper handling of the Opaque LSA's flooding
scope is placed on both the sender and receiver of the LSA. The
receiver must always store a valid received Opaque LSA in its link-
state database. The receiver must not accept Opaque LSAs that
violate the flooding scope (e.g., a type-11 (domain-wide) Opaque LSA

mikeybinec

Diane Teare, author of Implementing Cisco IP Routing (Cisco Press, 2010) sez:

"Types 9,10,or 11 are designated for future upgrades to OSPF for distributing application-specific information through an OSPF domain. For example, Cisco Systems uses Type 10 Opaque LSAs for MPLS Traffic.

powmia

Stop googling random crap and throwing answers at a person that will just confuse them.

Type-9 LSAs are link-local opaque LSAs. They are defined in an RFC (not reserved for future use). Yes they are link-local, not to be confused with IPv6 link-local; it just means they aren't to be flooded beyond a single link.

Type-9 LSAs are send to a neighbor with the GR flag set, as a part of the graceful-restart process.