From: Geralt Omhof (geralt@OmnIT.nl)
Date: Tue Dec 10 2002 - 11:08:51 GMT-3
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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