From: Jim\(thrupoint\) (jgrina@xxxxxxxxxxxxx)
Date: Wed Feb 07 2001 - 18:05:15 GMT-3
Simon,
IGPs, such as EIGRP are activated on an interface basis. With EIGRP as a
VLSM IGP, each network command under the router eigrp {proc number},
introduces an interface into the routing protocol, even if the interfaces
overlap in a classful environment, they do not enter the routing protocol
unless they are specifically enabled by a network statement or a
redistribute connected statement.
This does not mean that on the local router, they will/will not be part of
the local routing table. It means that the route through that interface
will/will not be distributed by the routing protocol. For example:
int to 0, ip add 192.168.1.17/28
int eth 0, ip add 192.168.1.9/28
router eigrp 10
network 192.168.1.0/28
EIGRP will advertise the using ethernet, not the choken ring. If auto
summary is on, EIGRP will also advertise 192.168.1.0/24
Both will show as connected routes in the local router. Routers with the
same EIGRP proc on the ethernet network will see a route to 192.168.1.0/28
with or without a summary route to 192.168.1.0/24
Jim
----- Original Message -----
From: "Simon Baxter" <Simon.Baxter@au.logical.com>
To: "Greg Ferro" <gferro@netstarnetworks.com>; "CCIE Group Study (E-mail)"
<ccielab@groupstudy.com>
Sent: Wednesday, February 07, 2001 5:12 PM
Subject: Passive interface questions
> Can anyone clarify the requirements when a question is worded :
>
> "Configure eigrp on the serial link between R1 and R2. Make sure
> token-ring0 is not included in eigrp"
>
> If the serial link network address falls in the same class boundary as the
> token, the token network will still advertised even if there's an
> appropriate passive-interface.
>
>
> Is the question asking you not to send eigrp updates down the link?
>
> Or is is asking you to do a distribute-list out (or similar) to exclude
the
> token ring network???
>
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