From: Ouellette, Tim (tim.ouellette@eds.com)
Date: Tue Dec 10 2002 - 22:28:26 GMT-3
I configured a router with a loopback ip of 2.2.2.2 on lo0
I enabled eigrp 2 with a network 2.0.0.0 statement and immediately saw the
hello's being multicast out of lo0 (see below)
I then configured a bogus neighbor of 2.2.2.22 and then saw unicast hellos
being sent that ip address as expected (see below)
but after I configured passive-interface, all hellos stopped being sent.
The one thing that did strick me as odd was that as soon as I entered the
"neighbor 2.2.2.22 loopback 0" that is stopped multicasting to 224.0.0.10
and only unicasted the hellos.
Can anyone else confirm?
1w6d: IP: s=2.2.2.2 (local), d=224.0.0.10 (Loopback0), len 60, sending
broad/mul
ticast
1w6d: IP: s=2.2.2.2 (Loopback0), d=224.0.0.10, len 60, rcvd 2
1w6d: IP: s=2.2.2.2 (local), d=224.0.0.10 (Loopback0), len 60, sending
broad/mul
ticast
1w6d: IP: s=2.2.2.2 (Loopback0), d=224.0.0.10, len 60, rcvd 2
R2(config-router)#neighbor 2.2.2.22 lo 0
R2(config-router)#
R2#
1w6d: IP: s=2.2.2.2 (local), d=2.2.2.22 (Loopback0), len 60, sending
1w6d: IP: s=2.2.2.2 (Loopback0), d=2.2.2.22 (Loopback0), len 60, rcvd local
pkt
R2#
R2#
1w6d: %SYS-5-CONFIG_I: Configured from console by console
1w6d: IP: s=2.2.2.2 (local), d=2.2.2.22 (Loopback0), len 60, sending
1w6d: IP: s=2.2.2.2 (Loopback0), d=2.2.2.22 (Loopback0), len 60, rcvd local
pktu
n all
All possible debugging has been turned off
R2#
R2#
Tim
-----Original Message-----
From: Adam Crisp [mailto:adam.crisp@totalise.co.uk]
Sent: Tuesday, December 10, 2002 7:47 AM
To: Tran Tien Phong; Jay Greenberg
Cc: Ram Shummoogum; eward15@juno.com; ccielab@groupstudy.com
Subject: RE: eigrp neighbor command
with RIP, you can use "passive interface" to block broadcast/multicast, and
use the neighbous command to unicast.
I assume the same is true of EIGRP.
Adam
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Tran Tien Phong
Sent: 10 December 2002 12:33
To: Jay Greenberg
Cc: Ram Shummoogum; eward15@juno.com; ccielab@groupstudy.com
Subject: RE: eigrp neighbor command
If passive interface was specified, RIP and EIGRP will not send any
routing updates via the passive interface, even neighbor command used
-----Original Message-----
From: Jay Greenberg [mailto:groupstudylist@execulink.com]
Sent: Tuesday, December 10, 2002 7:20 PM
To: Tran Tien Phong
Cc: Ram Shummoogum; eward15@juno.com; ccielab@groupstudy.com
Subject: RE: eigrp neighbor command
Event with passive-ineterface?
On Mon, 2002-12-09 at 23:54, Tran Tien Phong wrote:
> For RIP, although you configure neighbor command, RIP updates still
sent to multicast address 224.0.0.9. You need to define an access-list
to prevent this
>
> -----Original Message-----
> From: Ram Shummoogum [mailto:rshummoo@ca.ibm.com]
> Sent: Tue 12/10/2002 8:21 AM
> To: eward15@juno.com
> Cc: ccielab@groupstudy.com
> Subject: Re:eigrp neighbor command
>
>
>
> This is true for RIP but I am not sure about EIGRP. I know for a
fact that
> in EIGRP the passive-interface will prevent the formation of
neighbors.
>
> Rgds,
> RAM
>
>
>
> eward15@juno.com@groupstudy.com on 12/09/2002 07:52:52 PM
>
> Please respond to eward15@juno.com
>
> Sent by: nobody@groupstudy.com
>
>
> To: ccielab@groupstudy.com
> cc:
> Subject: Re:eigrp neighbor command
>
>
> I believe the neighbor command is used to send routing
annoucements as
> unicast packets instead of multicast or broadcast cast packets.
For
> instance, there may be 5 routers on a segment but only two of
them are
> using the same routing protocol. Instead of needlessly sending
updates to
> the other routers, you could use a passive-interface to block
the
> broadcasts/multicasts on the interface and instead send a
directed unicast.
> Someone please correct me if I am wrong.
>
> Eugene Ward
>
>
>
>
> ________________________________________________________________
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