From: Ram Shummoogum (rshummoo@ca.ibm.com)
Date: Tue Dec 10 2002 - 11:51:49 GMT-3
Everything you wrote is 110% correct but you did not answer the question "
When to use the neighbor command in EIGRP".
"Geralt Omhof" <geralt@OmnIT.nl> on 12/10/2002 09:08:51 AM
To: "Adam Crisp" <adam.crisp@totalise.co.uk>, "Tran Tien Phong"
<PhongTT2@FPT.COM.VN>, "Jay Greenberg"
<groupstudylist@execulink.com>
cc: Ram Shummoogum/Quebec/IBM@IBMCA, <eward15@juno.com>,
<ccielab@groupstudy.com>
Subject: RE: eigrp neighbor command
RIP: with passive interface you block the SENDING of broadcast route
updates. The router still receives them though. With the neighbor command
you can unicast routing updates to specific routers.
EIGRP: with passive interface you block the RECEIVING AND SENDING of route
updates. It prevents the sending of hello packets. Because no hello packets
are received by a neighbor, there will be no neighbor relationship
established, therefor no routing updates will be exchanged. The neighbor
command will not work in this case and it should not be used. To be able to
do the same as with RIP when you use "passive-interface" and "neighbor",
you should use "distribute-list" with EIGRP. Please someone correct me if
I'm wrong.... Check this at:
http://www.cisco.com/warp/public/103/16.html
and
http://www.cisco.com/warp/public/103/eigrpfaq.shtml#Q10
Regards,
Geralt
-----Original Message-----
From: Adam Crisp [mailto:adam.crisp@totalise.co.uk]
Sent: Tue 12/10/2002 1:46 PM
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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