From: Scott Morris (swm@emanon.com)
Date: Sun Jan 04 2004 - 17:09:42 GMT-3
The /21 on the net makes it the 104.x network. Your OSPF statement, even
though you're specifying a much more restrictive mask is matching the IP of
the loopback, therefore pulling the real mask in with it.
HTH,
Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider) #4713, CISSP,
JNCIS, et al.
IPExpert CCIE Program Manager
IPExpert Sr. Technical Instructor
swm@emanon.com/smorris@ipexpert.net
http://www.ipexpert.net
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of John
Underhill
Sent: Sunday, January 04, 2004 1:37 PM
To: ccielab@groupstudy.com
Subject: Router blew a gasket
I was looking through the routing tables and noticed a route I didn't
advertise. This is really strange, because it says loop0 is connected on
this box in the route table, and is advertising it into OSPF, but the loop0
address that is configured is not the same, (not even close), and I never
advertised this network in OSPF. Router has been rebooted and erased since
the last config, but it looks like it's keeping it in memory.. pretty
weird..
172.16.0.0/16 is variably subnetted, 9 subnets, 5 masks
C 172.16.134.0/24 is directly connected, Serial0.2
O IA 172.16.44.0/29 [110/65] via 172.16.134.4, 00:03:52, Serial0.2
O IA 172.16.22.0/27 [110/65] via 172.16.123.2, 00:03:52, Serial0.1
C 172.16.1.0/24 is directly connected, Serial1
C 172.16.123.0/24 is directly connected, Serial0.1
C 172.16.104.0/21 is directly connected, Loopback0 <-- This one --
R1#
!
interface Loopback0
ip address 172.16.111.1 255.255.248.0
no ip directed-broadcast
no ip route-cache
ip ospf network point-to-point
router ospf 110
area 111 virtual-link 172.16.134.4
network 172.16.111.0 0.0.0.7 area 11
network 172.16.123.0 0.0.0.255 area 0
network 172.16.134.0 0.0.0.255 area 111
Routing table on another box shows the route..
C 172.16.122.0/27 is directly connected, Loopback0
C 172.16.22.0/24 is directly connected, Dialer0
C 172.16.22.1/32 is directly connected, Dialer0
C 172.16.123.0/24 is directly connected, Serial0.1
O IA 172.16.104.0/21 [110/65] via 172.16.123.1, 00:01:58, Serial0.1
R2#
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