From: Hunt Lee (ciscoforme3@xxxxxxxxxxxx)
Date: Mon Aug 19 2002 - 08:21:51 GMT-3
hi all
i have doubt
I am trying to work out what does the "default-information originate
route-map <test1>" command do.
RTA --- RTB --- RTC --- 3.3.3.0/30
Both RTA & RTB are in OSPF Area 0
RTB & RTC are using EIGRP, so RTB is OSPF's ASBR
3.3.3.0/30 is a Loopback interface at RTC.
I have setup on RTB so that it will only advertise a default route
into OSPF domain based on the existence of the 3.3.3.0/30 network
(which is learnt via EIGRP from RTC).
RouterB
default-information originate route-map test1
access-list 2 permit 3.3.3.0 0.0.0.3
route-map test1 permit 10
match ip address 2
That works fine. However, after I changed the command to
"default-information originate always route-map test1", I shut down
the Loopback interface on RTC, and RTB suddenly stops advertising the
Type 5 default route into OSPF (to RTA). Why?? I always thought
that with the "always" keyword, the OSPF router will always (i.e. at
all times) advertise a default route into OSPF, even if it hasn't got
a default route in it's own routing table. Am I missing something
simple here??
N.B:- I have also search the CCO, it only talks about the
"default-information originate" command, but without mentioning the
"always" keyword and "route-map" option used together.
thanks
H.
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