configuring igrp

configuring igrp

Post by die.. » Thu, 25 Jan 2001 17:15:29



I am main instructor for the CCNA program at a school in germany. We
have passed the first and second semester of the CISCO Curriculum. Now
I am teaching the third semester. By configuring IGRP on a CISCO Router
the following question occured:
if i set the sleeptime on 60 seconds to restrain the immediatly flush
update, and by the way i set also the holddown timer on 120 seconds,
what would be lawfully?? What time do the router wait until updating,
if there is a change on one of itsown interfaces??

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1. Need Advice on Configuring Default Routes in IGRP

I need some advice on configuring IGRP.  I have read several books on the
subject but I still do not understand how to configure default routes
(default networks? candidate default routes? classful? classless?)

I have the following configuration:

A Cisco 2948G-L3 which is the backbone router for my small network.  It is
configured in the following way:

BVI1 (ports 1-6) ip addr 192.168.1.1
BVI2 (ports 7-12 ip addr 192.168.2.1
BVI3 (ports 13-18 ip addr 192.168.3.1
BVI4 (ports 19-24 ip addr 192.168.4.1

Switches are attached to the ports and end-nodes are attached to the
switches.  The router is named BB.

On subnet 192.168.2.0 I have a firewall (ip addr 192.168.2.4)

I currently have a default gateway on the 2948G-L3: 0.0.0.0 0.0.0.0
192.168.2.4 to route traffic to our public network via the firewall and on
to the Internet via our edge router.  This all works fine.

We acquired a small company at a remote location.  We want to connect them
to our network.  I thought I would use IGRP as my routing protocol.

The remote site currently has its own connection to the Internet via a
firewall.  I will give them the network address 192.168.6.0 and give their
firewall the ip addr 192.168.6.4

I will add a Cisco 2621XM to network 192.168.2.0 at headquarters.  The
router name will be HQ.  I will add a Cisco 2621XM to network 192.168.6.0 at
the branch office.  The router name will be BR.

The router configurations will be as follows:

Router BB
BVI1 (ports 1-6) ip addr 192.168.1.1
BVI2 (ports 7-12 ip addr 192.168.2.1
BVI3 (ports 8-13 ip addr 192.168.3.1
BVI4 (ports 14-19 ip addr 192.168.4.1
router igrp 10
network 192.168.1.0
network 192.168.2.0
network 192.168.3.0
network 192.168.4.0

All nodes on the above subnets use .1 as their default gateway e.g.,
192.168.1.1,  192.168.2.1, 192.168.3.1 and 192.168.4.1.

Router HQ
interface fastEthernet 0 ip addr 192.168.2.3
interface serial 0 ip addr 192.168.5.1
router igrp 10
network 192.168.2.0
network 192.168.5.0

Router BR
interface fastethernet 0 ip addr 192.168.6.1
interface serial 0 ip addr 192.168.5.2
router igrp 10
network 192.168.5.0
network 192.168.6.0

All nodes on  subnet 192.168.6.0 will use 192.168.6.1 as their default
gateway.

The L3 switch and the other two routers will swap routing tables via igrp to
be able to route internal traffic both locally and across the WAN.

Questions:
What do I need to do to route Internet traffic from subnets 192.168.1.0,
192.168.2.0, 192.168.3.0, and 192.168.4.0 to the Firewall (ip addr
192.168.2.4 at headquarters?

What do I need to do to route Internet traffic from subnet 192.168.6.0 to
the Internet via Firewall ip addr 192.168.6.4 at the branch office?

Should I configure igrp to advertise routes out of all interfaces on all
routers, even the 2948G-L3 as I have indicated with the above
configurations?

Is it o.k. to go to the gateway on BR via fastethernet 0 ip addr 192.168.6.1
and back out of the same interface to the firewall ip addr 192.168.6.4?

Thanks,

Tom Naves

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