From: shiran guez (shiranp3@gmail.com)
Date: Tue Feb 26 2008 - 13:29:01 ARST
they are not the same IGMP are messages sent between host to router to join
or leave a group the IGMP is not filter for the multicast packets.
if you have the following and multicast is defined between R1 to R2 to R3:
R1-->R2-->R3
and you put on R2 interface to R1 IGMP filter it will not stop the multicast
packet from traveling from or to R1.
it will stop only hosts in R2 network join to R2 interface where the filter
is set (in case also that the filter is set properly)
On Tue, Feb 26, 2008 at 5:21 PM, Andy <and123and@googlemail.com> wrote:
> Thanks Geert, both seem to be acheiving the same result, stopping a
> particular mcast from crossing a device, ie if the question asked was make
> sure 224.x.y.z is not available on this interface then could we use
> either...?
>
> On 26/02/2008, Geert Nijs <Geert.Nijs@simac.be> wrote:
> >
> > Actually they are completely different.
> >
> > ip igmp access-group acts on IGMP packets at the edge and determines
> which
> > groups a client can join by determining which IGMP membership packets
> the
> > switch will accept.
> >
> > ip multicast boundary acts on the actual multicast stream packets and
> > determines which multicast packets will pass the boundary by looking at
> the
> > multicast destination address.
> > Certain destination addresses can be filtered using ACLs. If needed, it
> > can also filter auto-rp messages to remove the same groups from the
> auto-rp
> > advertisements.
> >
> > regards,
> > Geert
> >
> > ________________________________________
> > From: nobody@groupstudy.com [nobody@groupstudy.com] On Behalf Of Andy [
> > and123and@googlemail.com]
> > Sent: 26 February 2008 14:43
> > To: ccie forum
> > Subject: "ip multicast boundary" v "ip igmp access-group"
> >
> > Hi
> >
> > the two commands below kinda acheive the same thing, dont they? What are
> > the
> > differences and when to use one over the other.
> >
> > ip multicast boundary
> >
> > ip igmp access-group
> >
> > Thanks
> >
> > -A
> >
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-- Shiran Guez MCSE CCNP NCE1 http://cciep3.blogspot.com http://www.linkedin.com/in/cciep3
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