From: Evgeny Tantsura (ivgen@castel.nl)
Date: Thu Dec 12 2002 - 11:39:48 GMT-3
On Tue, 10 Dec 2002, Ram Shummoogum wrote:
> Everything you wrote is 110% correct but you did not answer the question "
> When to use the neighbor command in EIGRP".
If you want to use unicast instead of multicast.
>
>
>
>
> "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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> > .
> > .
> > .
> .
> .
> .
With kind regards/ met vriendelijke groeten,
------------------------------------------------
E. Tantsura
Network Developer
Essent Kabelcom N.V.
Dr.van Deenweg 84
8025BN Zwolle, The Netherlands
Tel: +31-(0)38-850-7642
Fax: +31-(0)38-850-7410
Mob: +31-(0)6-290-80458
------------------------------------------------
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