From: CCIE KH49279 (ccie_lab@inetiq.com)
Date: Mon Feb 27 2006 - 19:57:16 GMT-3
I am chiming in late on this and trying to understand the context. If you
need to extend an mcast network over routers that do not understand mcast,
then I assume you would tunnel between the two mcast endpoints over the non
mcast network. If you needed to extend the igmp functionality over an extra
hop between the igmp router and hosts participating in the IGMP messaging,
then we use the multicast stub routing.
Close, off base??
I would appreciate some feedback.
Thanks,
Wayne
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
CCIEin2006
Sent: Thursday, January 19, 2006 4:59 PM
To: Faryar Zabihi (fzabihi)
Cc: Cisco certification
Subject: Re: What good is multicast stub routing?
If the routers were not running multicast then how would they forward the
multicast traffic?
On 1/19/06, Faryar Zabihi (fzabihi) <fzabihi@cisco.com> wrote:
>
> If I need to send multicast traffic over routers that are not running
> multicast, would I use stub routing or a GRE tunnel?
> Would it matter if there is one or two routers in between?
>
> Faryar Zabihi
>
> Cisco Systems Inc.
> RTP, NC 27709
>
> For urgent network matters, please call the Cisco Technical Assistance
> Center (TAC) at 1-800-553-2447 All Cisco security advisories are
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>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
> Of Tim
> Sent: Thursday, January 19, 2006 5:15 PM
> To: 'CCIEin2006'; 'Cisco certification'
> Subject: RE: What good is multicast stub routing?
>
> This feature is a way of extending igmp function an extra hop.
>
> I can't say whether this feature has real world value but that doesn't
> matter with respect to the lab.
>
> It's not a hard feature to configure. Just make sure you know how to
> configure it and how to recognize the requirement for it in the lab
> and you'll be fine.
>
> Then move on to the other stuff.
>
> HTH, Tim
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
> Of
> CCIEin2006
> Sent: Thursday, January 19, 2006 5:00 PM
> To: Cisco certification
> Subject: What good is multicast stub routing?
>
> According to Cisco:
>
> "Stub IP multicast routing allows stub sites to be configured quickly
> and easily for basic multicast connectivity, without the flooding of
> multicast packets and subsequent group pruning that occurs in dense
> mode, and without excessive administrative burden at the central site."
>
> I'm not sure what you're really saving here. If there is a multicast
> receiver at the stub site, the multicast packets still have to flow
> over the same link. And how much more administrative burden is it to
> configure pim on an interface than to configure a pim neighbor filter
> and igmp helper address?
>
> Can someone explain the utility of this feature?
>
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