05-08-2007 11:25 PM - edited 03-05-2019 03:57 PM
Hi,
i need information between stub area(As Default route to reach any destination)and not so stuby area(AS some specfic rute rather than default route).in which circumstances the both stub and NSSA is used
What it identifies the AGE column when viewing the LSA types and in which type it show the AGE as DONT AGE OUT
#show ip ospf database
can u explain the TYPE 6 LSA and what it describe (In books it mentioned as generated by special type of multicast OSPF router)what it means and were it is generated
Regards,
Vinoth
05-08-2007 11:41 PM
Hi Vinoth
A stub area is one in which only type 1, 2 & 3 LSA's are advertised into that area. Any routes external to the OSPF autonomous system will not be advertised and a default route will advertised into the area instead.
Note that summary network routes external to that OPSF area but still within the OSPF autonomous system will be advertised into the stub area.
For completeness a totally stubby area replaces all external routes whether internal to the autonomous system or external with a default route.
If you have an area where you have an OSPF router that speaks to another router that is not part of the OSPF autonomous system then the OSPF router would become an ASBR. As such this area could not be a stub area. By making an area an NSSA you allow external routes to the autonomous system to be advertised into the AS and still treat this area as a stub area in relation to the rest of the AS.
Not sure i fully understand the question as regards the aging - could you be a bit more specific.
The type 6 LSA is to do with multicast and MOSPF which is a multicast routing protocol which serves the same purpose as the more familiar PIM. MOSPF is not supported by Cisco routers.
HTH
Jon
05-09-2007 12:07 AM
Thanks for your reply
When i put a command #show ip ospf database
in a multiarea ospf router
it will show the
ROUTER LINK STATES (TYPE 1 LSA)
router adv roueter age seq no checksum
what it defines of AGE in the column of the LSA types
and i heard some were in ospf that the AGE will not AGE OUT
were that is and why ?
Thanks in Advance
vinoth
05-08-2007 11:46 PM
Hi,
You should have a look at this example:
http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080094a74.shtml
NSSA is applicable when you do not have only one exit point. Lets say a prefix is reached using another link than the one you use for everything else (default gateway)
HTH
Regards,
Bjornarsb
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