About the ISIS routing question.

From: Tony Kwok (sykwok8@yahoo.com)
Date: Sat Feb 08 2003 - 00:12:35 GMT-3


Hi,

I have found one very interesting thing on isis. Does
anyone can explain. The following is my netwrok
topology. The R1 has two ethernet interface. One is
connecting to R2.

R1------------R2

R1 configuration.
================

interface Ethernet1/0
 ip address 150.50.17.1 255.255.255.0
 Description connecting to R2
 ip router isis
!
interface Ethernet1/1
 ip address 150.50.200.1 255.255.255.0
 half-duplex

router isis
 passive-interface Ethernet1/1
 net 11.1111.1111.1111.1111.00
 is-type level-1

R2 Configuration
===============
interface FastEthernet0/0
 ip address 150.50.17.2 255.255.255.0
 ip router isis
  duplex auto
 speed auto
 
router isis
 net 11.1111.1111.1111.1112.00
 is-type level-1

***************************************
From this configuration, I suppose that I cannot
receive the route 150.50.200.0/24 on R2 through the
isis because the interface has not join the isis and
also it has not redistribute out by the redistribute
command. However, I found that I am wrong. Does
someone can explain why? I have tested that the route
will be disappeared once I delete the passive
interface command on the router configuration. Thx.

R2#sh ip route isis
i L1 150.50.200.0/24 [115/10] via 150.50.17.1,
FastEthernet0/0

Regards,
Tony



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