From: Jason Gardiner (gardiner@xxxxxxxxxx)
Date: Thu Aug 09 2001 - 09:03:33 GMT-3
The way I figure, since the Token Ring address space is in the same
classful addres space as the Serial interface and they all have the same
/24 mask, since the serial is the only interface sending routes, this is
treated as FLSM. The Ethernet space is not in the same address block as
the Serial, so it is treated as classful.
"Daniel C. Young" wrote:
>
> Group,
>
> Does IGRP advertise loopbacks or ethernet segments as network summaries
> only? With token ring it seems to advertise the subnet just fine. I have the
> following configuration:
>
> interface Loopback0
> ip address 15.15.8.8 255.255.255.0
> !
> interface Ethernet0
> ip address 172.27.1.1 255.255.255.0
> no keepalive
> !
> interface Ethernet1
> ip address 172.27.2.1 255.255.255.0
> no keepalive
> !
> interface Serial0
> ip address 10.1.10.8 255.255.255.0
> !
> interface TokenRing0
> ip address 10.2.1.1 255.255.255.0
> ring-speed 16
> !
> interface TokenRing1
> ip address 10.3.1.1 255.255.255.0
> ring-speed 16
> !
> router igrp 1
> passive-interface Ethernet0
> passive-interface Ethernet1
> passive-interface Loopback0
> passive-interface TokenRing0
> passive-interface TokenRing1
> network 10.0.0.0
> network 15.0.0.0
> network 172.27.0.0
>
> As you can see, IGRP is advertising the TR interfaces as subnets, but only
> classful network summaries for the ethernet and loopbacks. The remote router
> is not receiving the route for the loopback address as well.
>
> 06:14:50: IGRP: sending update to 255.255.255.255 via Serial0 (10.1.10.8)
> 06:14:50: subnet 10.3.1.0, metric=688
> 06:14:50: subnet 10.2.1.0, metric=688
> 06:14:50: network 172.27.0.0, metric=1100
> 06:14:50: network 15.0.0.0, metric=501
> 06:14:50: IGRP: Update contains 2 interior, 2 system, and 0 exterior routes.
> 06:14:50: IGRP: Total routes in update: 406:17:50: IGRP: received update
> from 10.1.10.6 on Serial0
>
> Am I missing something obvious?
>
> Please help.
>
> Daniel C. Young
> Sr. Network Engineer
> (909) 221-1928 Direct
> dan.young@sbc.com
>
> SBC Internet Data Center
> 2681 Kelvin Ave.
> Irvine, CA 92614
> (949) 221-1900 Main
> (949) 221-1978 Fax
> **Please read:http://www.groupstudy.com/list/posting.html
-- Thanks,Jason Gardiner Supervisor, Engineering Services Sprint E|Solutions
"You can swim all day in the Sea of Knowledge and still come out completely dry. Most people do."
- Norton Juster **Please read:http://www.groupstudy.com/list/posting.html
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