From: ccie2be (ccie2be@nyc.rr.com)
Date: Fri Oct 03 2003 - 08:52:18 GMT-3
Routing protocols send out advertisements through all interfaces in networks
they are aware of.
Take RIP, for example. If there are several interfaces in the 10.0.0.0
network on your router, ie 10.1.0.0, 10.2.0.0, 10.3.0.0, and RIP knows about
the 10.0.0.0 network ( you have the command "network 10.0.0.0") configured
under the RIP process, RIP will, by default, send out advertisements through
all interfaces that have an ip address of 10.x.x.x including the loopback
interface.
Since there's no point in RIP sending out advertisements through it's own
loopback since the advertisements can't go anywhere from there, you can save
router resources by specifying the loopback as a passive interface. When an
interface is designated passive, that interface won't send out routing
updates. The interface can still receive updates.
HTH, dt
----- Original Message -----
From: "k c" <jwongccie@yahoo.com.hk>
To: <ccielab@groupstudy.com>
Sent: Friday, October 03, 2003 7:36 AM
Subject: passive interface lo
> I have seen the command "passive interface lo0" configured in some routing
protocols like rip, eigrp, ospf, isis. What does this mean? Loopback is not
a physical interface, why make it passive? What is the theory behind?
>
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