From: ccie2be (ccie2be@nyc.rr.com)
Date: Thu Jul 31 2003 - 10:38:28 GMT-3
Hi,
I observed the following behavior which I don't really understand.
Here's the network layout:
R2- s0.24 p2p---------------s0 R4
| \ \
| \ \
s1 s0.123 multipoint
| \ \
| / \
| / \
| / \
s1 s0 \
R3 R1
R2 is running ODR and OSPF. R4 is not running any routing protocol and is a
stub router. R1 and R3 are running OSPF. R3's route table showed an ODR
derived default route, *0.0.0.0, from R2 which I didn't want. R1's route
table didn't have an ODR derived default route. At this point I hadn't
changed any of the CDP defaults. And, when I checked on R2 show cdp int, it
showed cdp running on int s1 and s0.24. Interestingly, cdp wasn't running on
int s0.123multipoint.
Question1: Is that the normal behavior of CDP ie. it doesn't by default run
on multipoint F/R subinterfaces although, by default, it runs on p2p
subinterfaces and regular hdlc serial interfaces?
After turning off cdp on R2's s1 interface, I repeatedly checked R3's route
table for several minutes and the ODR derived default route never went away.
Question2: Shouldn't the default route on R3 get flushed out of the route
table and if so, how long should that take?
After manually clearing the default route on R3, I reenabled cdp on R2's s1
interface and checked for several minutes R3's route table but the default
route didn't reappear. Then I enable cdp on R2's s0.123multipoint interface
but still the default route didn't reappear in R3's route table.
Question3: Why doesn't the default route reappear in R3's route table?
Thanks in advance, Raj
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