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Home > Archive > CCNP > January 2003 > Ospf Nssa
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| wirelessboy 2003-01-11, 9:07 pm |
| dear all
can u clear some of my doubts in OSPF
what does not-so-stubby area really mean, i do not understand its use, instead of a type5, a type7 LSA is sent, but again at the ABR it is converted to type5, so whats the use?
what does LINK ID mean, in the output of sh ip ospf database, is it the ip of the interface from which the LSA is being sent?
ADV Router in the link-state database is the ROUTER ID, am i correct?
one basic question, will a new LSA mean a reacalculation of Database.
regards | |
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| wirelessboy 2003-01-13, 8:16 am |
| hey darthfeces
the link is not working
if u have the material please mail me | |
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| hello,
NSSA's are used when you want the nssa to have knowledge of routes outside the AS. Remember type 5 LSA's are "External Link Advertisements" and is generated by the ASBR. Knowing that a stubby area will not accept type 5 LSA's, the nssa's ABR translates these type 5 LSA's into type 7 LSA's, which the nssa will accept.
Example: If you have an area that you want to make stubby, but you still want the area to know about the internet, you could make the area a nssa. Then it would have a default route to it's own ABR and knowledge of how to reach the internet.
If only I could draw a topology. It would be so clear.
To be honest with you, I can't figure out "exactly" what the link ID is. Because sometimes it's an ip address and sometimes it's a network number!
Yes, ADV Router is the router ID.
A link state change would mean LSA flooding so that all routers become synchronized, and then the routers would perform the database recalculation.
-Good Luck-
capac | |
| wirelessboy 2003-01-14, 3:59 am |
| dear capac
sh ip ospf database output
(In the high level view of the database when referencing a router this is called Link ID)
LS Type Link State ID (link id)
1 The originating Router's Router ID (RID).
2 The IP interface address of the network's
Designated Router.
3 The destination network number.
4 The router ID of the described
AS boundary router.
5 The external network number.
thanks for the response |
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