From: David H. Brown (DHBrown@xxxxxxxxxxxx)
Date: Thu Jun 29 2000 - 02:00:45 GMT-3
This is useful when you have two redundant links on routers out of a
corporate location, and a remote site router goes down for some reason.
Consider this drawing of a remote site scenario:
Corporate ---- Servers (some have R1 as Def G/W
Net with ----S0-(R1)-E0--| some have R2 as Def G/W)
Redundant |
Serial ----S0-(R2)-E0--|
Links to ---- Workstations (Same Def G/W as above)
remote site
If R2 goes down and any of the devices at the location have R2 E0 as their
default gateway, those devices will not have connectivity to the Corp Net
any longer. By adding the R2 E0 address to the R1 E0 as a secondary, all
devices will regain connectivity while R2 is down.
Better solution: HSRP.
The above scenario is Human Standby Routing Protocol... :)
This happened in real life, hope it helps.
David
(RTP Lab 9/28)
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
AndyChang@mesiniaga.com.my
Sent: Wednesday, June 28, 2000 10:52 PM
To: ccielab@groupstudy.com
Subject: Why can I put secondary addresses on the same interface?
I set up the following
interface Ethernet0
ip address 10.10.3.4 255.255.255.0 secondary
ip address 10.10.3.3 255.255.255.0
The router IOS allows me to do this. I am wondering why and in what
circumstance that this will be
useful?
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