From: Don Dettmore (don@xxxxxxxxxxxxx)
Date: Wed Jun 13 2001 - 11:36:32 GMT-3
Ok, go with me on this one - I thought NSSA areas were quite easy, but
apparently I don't understand them:
(192.168.49.0)-----RouterA---(172.16.253.0)---RouterB-----(2.2.2.0)-----Route
rC-----(3.0.0.0)
Router C runs:
- EIGRP 3 on the 3.0.0.0 interface
- OSPF Area 2 on the 2.2.2.0 interface
- OSPF Area 0 on all other interfaces (not shown in diagram)
Router B runs OSPF Area 2 on all interfaces
RouterA runs:
- OSPF Area 2 on the 172.16.253.0 interface
- EIGRP 25 on the 192.168.49.0 interface
Area2 is an NSSA area. RouterC is configured to originate a default route
into Area 2 (command= area 2 nssa default-information-originate)
I am redistributing the following routes into OSPF:
- 3.0.0.0 on RouterC
- 192.168.55.0 on RouterA (this is a network that exists out in the EIGRP 25
domain)
What I don't understand is the routing table on RouterB. It contains the
following:
- A route (N2) to 3.0.0.0. It shouldn't have this, should it?
- No route at all to 192.168.55.0, though this route exists on RouterC as an
N2 route
I thought it should be reverse - RouterB would see 192.168.55.0 as an N2 route
(type 7LSA) and no route to 3.0.0.0 - a default route instead. (it DOES see
the default route).
Note that other Area 0 routers further down the chain (not shown on the
diagram) properly see both 3.0.0.0 and 192.168.55.0 as E2 routes.
Can anyone explain this?
TIA
Don Dettmore
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