Leigh Anne,
There is a "neighbour" statement in EIGRP just like OSPF and RIP. If you
configure an interface as "passive", Multicast Hellos are NOT sent on that
interface. However, neighbor statements will send unicast hellos and will
attempt to form adjacenties. Even if its over a passive interface. I have
used this in RIP and OSPF but not EIGRP. I don't have a lab anymore so
maybe someone can test this.
Could the "passive interface" command be what they are talking about when
it means disabling multicast?
Tony M.
#6172
----- Original Message -----
From: Leigh Anne Chisholm
To:
Sent: Saturday, August 04, 2001 1:57 PM
Subject: RE: EIGRP's interpretation of NBMA and "disabling [7:14912]
> I'd say that that's close Chuck... but it doesn't say how to disable
> physical multicasting. It shows the alternative for SMDS. And since I'm
> not that "up" on SMDS, I'm more interested in NBMA from the perspective of
> EIGRP.
>
> Right now I'm too busy to do any sort of deep investigation--just if
anyone
> knew the answer as to how to disable physical multicasting and why you'd
> want to do it, that would have been a bonus. Since there's not a flurry
of
> activity regarding my query (EIGRP pun intended), I'd say not many people
> know...
>
> Guess I'm SIA. Stuck in active. No reply to query received.
>
> -----Original Message-----
> From: Chuck Larrieu [mailto:[EMAIL PROTECTED]]
> Sent: Saturday, August 04, 2001 12:56 PM
> To: Leigh Anne Chisholm; [EMAIL PROTECTED]
> Subject: RE: EIGRP's interpretation of NBMA and "disabling
> multicasting"? [7:14693]
>
>
> don't know if you have already received an answer to this, but one good
> source is the CCO configuration guides. in the case of SMDS you can read
it
> at:
>
> http://www.cisco.com/univercd/cc/td/doc/cisintwk/ito_doc/smds.htm
>
> the quote you provide does talk about the physical ( carrier ) level, and
> with SMDS there are means of configuring it from the carrier side as a
> series of point to point links or as a single multipoint domain.
>
> "SMDS group addresses allow a single address to refer to multiple CPE
> stations, which specify the group address in the Destination Address field
> of the PDU. The network makes multiple copies of the PDU, which are
> delivered to all members of the group. Group addresses reduce the amount
of
> network resources required for distributing routing information, resolving
> addresses, and dynamically discovering network resources. SMDS group
> addressing is analogous to multicasting on LANs. "
>
> in your quote, I believe that the "interface" referred to is the physical
> interface, i.e. the interface connecting to the SMDS CPE - probably a(n)
> HSSI.
>
> make sense?
>
> Chuck
>
> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
> Leigh Anne Chisholm
> Sent: Thursday, August 02, 2001 12:16 PM
> To: [EMAIL PROTECTED]
> Subject: EIGRP's interpretation of NBMA and "disabling multicasting"?
> [7:14693]
>
>
> On Cisco's site, I've been searching for information as to when the hello
> interval is set to 5 seconds and when it is set to 60 seconds. Hellos are
> sent every 5 seconds except on low-speed, NBMA media. Low-speed is
defined
> as 1.544 Mbps and under. No problems there.
>
> What I don't understand is this statement:
>
> "Note that for the purposes of EIGRP, Frame Relay and Switched
Multimegabit
> Data Service (SMDS) networks may or may not be considered to be NBMA.
These
> networks are considered NBMA if the interface has not been configured to
use
> physical multicasting; otherwise they are not considered NBMA."
>
> How can you configure an interface not to use multicasting? This is
> something I haven't come across how to do yet. Is this configuring EIGRP
> multicasts to use unicasts (I think I saw something like that last night
but
> I was too tired to comprehend it or even remember where I saw it).
>
>
> -- Leigh Anne
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=14917&t=14912
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