Mailing List Archive: Cisco: NSP

Multicast on PPP

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vikassharmas at gmail

Oct 21, 2009, 1:14 AM

Post #1 of 7 (1799 views)
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Multicast on PPP

Hi,

Does anyone has implemented multicast over PPP interface? Since PPP
does not support PIM, I am trying to use proxy-service and
mroute-proxy. When I do join on dialer interface, I am able to ping
the multicast ip (this confirms no issue in n/w wrt multicast). But
when I join on LAN interface (removing igmp-join from dialer
interface), it does no work, I am not able to ping the multicast IP
from remote CE.

Can anyone help me here?

Regards,
Vikas Sharma
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zoe-nsp at complicity

Oct 21, 2009, 2:13 AM

Post #2 of 7 (1750 views)
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Re: Multicast on PPP [In reply to]

Vikas Sharma wrote:
> Does anyone has implemented multicast over PPP interface? Since PPP
> does not support PIM, I am trying to use proxy-service and
> mroute-proxy. When I do join on dialer interface, I am able to ping
> the multicast ip (this confirms no issue in n/w wrt multicast). But
> when I join on LAN interface (removing igmp-join from dialer
> interface), it does no work, I am not able to ping the multicast IP
> from remote CE.
>
> Can anyone help me here?

We have Multicast working quite happily over PPP/ADSL, it just needs "ip
pim sparse-mode" and "ip pim bsm-border" on the appropriate
virtual-template interface. (I would not recommend using dialer interfaces)

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gert at greenie

Oct 26, 2009, 12:17 PM

Post #3 of 7 (1704 views)
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Re: Multicast on PPP [In reply to]

Hi,

On Wed, Oct 21, 2009 at 01:44:08PM +0530, Vikas Sharma wrote:
> Does anyone has implemented multicast over PPP interface? Since PPP
> does not support PIM,

PIM is independent of PPP - and one works nicely across the other.

So, yes, we've done "ip pim sparse-mode" on PPP interfaces (STM1/OC3)
and that worked nicely.

gert
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tony at lava

Oct 26, 2009, 12:26 PM

Post #4 of 7 (1715 views)
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Re: Multicast on PPP [In reply to]

You don't need PIM to do multicast over PPP. Many dialup/terminal servers
that support multicast do so using some form of IGMP proxy.

Antonio Querubin
808-545-5282 x3003
e-mail/xmpp: tony [at] lava

gert at greenie

Oct 26, 2009, 2:19 PM

Post #5 of 7 (1719 views)
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Re: Multicast on PPP [In reply to]

Hi,

(top-posting really sucks).

On Mon, Oct 26, 2009 at 09:26:23AM -1000, Antonio Querubin wrote:
> You don't need PIM to do multicast over PPP. Many dialup/terminal servers
> that support multicast do so using some form of IGMP proxy.

I was responding to the original claim that "PPP does not support PIM".

Well, it does.

Of course there might be other ways to get multicast streams across a PPP
link - but the original posting didn't even mention "dialup" or
"terminal servers". There's more PPP than "end users".

(But *if* you connect end users using PPP, you don't need an IGMP proxy
on the ISP side - either the end user is directly connecting his machine
to the PPP link, in which case it's "direct IGMP, no proxy", or the
end user has a router, in which case the IGMP proxy needs to be on the
CPE, not on the dialup/terminal server).

gert
--
USENET is *not* the non-clickable part of WWW!
//www.muc.de/~gert/
Gert Doering - Munich, Germany gert [at] greenie
fax: +49-89-35655025 gert [at] net

tony at lava

Oct 26, 2009, 3:37 PM

Post #6 of 7 (1714 views)
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Re: Multicast on PPP [In reply to]

On Mon, 26 Oct 2009, Gert Doering wrote:

> Hi,
>
> (top-posting really sucks).

For some reason alpine turned your post into an 'attachment' - not quite
the same as top-posting.

> On Mon, Oct 26, 2009 at 09:26:23AM -1000, Antonio Querubin wrote:
>> You don't need PIM to do multicast over PPP. Many dialup/terminal servers
>> that support multicast do so using some form of IGMP proxy.

> (But *if* you connect end users using PPP, you don't need an IGMP proxy
> on the ISP side - either the end user is directly connecting his machine
> to the PPP link, in which case it's "direct IGMP, no proxy", or the

I think that really depends on the type of equipment connecting the end
user. Our access servers here aren't cisco equipment, do not run PIM, but
do act like layer 3 devices. Hence the only way for the access server to
communicate group membership between the network and the end-user is to
track the IGMP membership on all the PPP links and then proxy that on its
ethernet interface. On the other hand, for end-users who are sourcing
multicast traffic, because our access servers do not run PIM, the sourced
multicast traffic is just punted directly onto the ethernet.

Antonio Querubin
808-545-5282 x3003
e-mail/xmpp: tony [at] lava
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gert at greenie

Oct 27, 2009, 1:03 AM

Post #7 of 7 (1686 views)
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Re: Multicast on PPP [In reply to]

Hi,

On Mon, Oct 26, 2009 at 12:37:49PM -1000, Antonio Querubin wrote:
> >(But *if* you connect end users using PPP, you don't need an IGMP proxy
> >on the ISP side - either the end user is directly connecting his machine
> >to the PPP link, in which case it's "direct IGMP, no proxy", or the
>
> I think that really depends on the type of equipment connecting the end
> user. Our access servers here aren't cisco equipment, do not run PIM, but
> do act like layer 3 devices. Hence the only way for the access server to
> communicate group membership between the network and the end-user is to
> track the IGMP membership on all the PPP links and then proxy that on its
> ethernet interface. On the other hand, for end-users who are sourcing
> multicast traffic, because our access servers do not run PIM, the sourced
> multicast traffic is just punted directly onto the ethernet.

Yes, you're certainly right here. In case of a dial-in server that does
not speak PIM, using an IGMP proxy in the dial-in server will certainly
enable end users (direct IGMP speakers, no PIM-using CPE) to receive
multicast streams.

Thanks for pointing out this bit.

gert
--
USENET is *not* the non-clickable part of WWW!
//www.muc.de/~gert/
Gert Doering - Munich, Germany gert [at] greenie
fax: +49-89-35655025 gert [at] net

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