RE: multicast nightmare #42

["Michael K. Smith - Adhost" <mksmith () adhost com>]

As an aside, the 6-port GigE card is not oversubscribed.

Mike

--
Michael K. Smith - CISSP, GISP
Chief Technical Officer - Adhost Internet LLC mksmith () adhost com
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> -----Original Message-----
> From: Philip Lavine [mailto:source_route () yahoo com]
> Sent: Thursday, October 15, 2009 1:07 PM
> To: Eric Ortega; nanog
> Subject: Re: multicast nightmare #42
>
> Thank you Eric you are a genius, that has solved and issue that has
> plagued me for 3 years.
>
> the problem was exactly as you said over subscription of the 8 ports
> tied to 1 ASIC
>
>
>
>
> ________________________________
> From: Eric Ortega <eric_ortega () mmi net>
> To: Philip Lavine <source_route () yahoo com>
> Sent: Wed, October 14, 2009 9:51:43 AM
> Subject: Re: multicast nightmare #42
>
> Depending on the model of
> blade there is an 8-to-1 over subscription on the 4500s. I have had
all
> kinds of headaches with this myself. The 48 port SFP "gig" blade can
> only have 1 gig per each set of 8 ports. The aggregate ports are known
> as "gigaports". The layout is gigaport 1 = 1,3,5,7,9,11,13,15 gigaport
> 2 = 2,4,6,8,10,12,14,16 and so on. I bet that if add up the total
> bandwidth in each gigaport you might be over the "limit"
>
> Philip Lavine wrote:
> > I wish that was the case but the switch is a 4500 and the data
> > rates are less than 100 mbps on a 1 gig blade/sup
> ________________________________
> From: >Eric Ortega <eric_ortega () mmi net>
> > To: Philip Lavine
> > <source_route () yahoo com>
> > Sent: Wed, October 14,
> > 2009 8:24:59 AM
> > Subject: Re: multicast
> > nightmare #42
> >
> > Are you over subscribing
> > either the link or the backplane of the switching device?
> >
> > > Philip Lavine wrote:
> >
> > Please explain how this would be possible:
> > > 1 sender
> > > 1 mcast group
> > > 1 receiver
> > > ----------------
> > > = no data loss
> > >
> > > 1 sender
> > > 1 mcast group
> > > 2+ receivers on same VLAN and physical segment
> > > --------------------
> > > = data loss
> >
> > --
> >
> >
> > Eric R. Ortega
> > Network Engineer
> > Midcontinent Communications
> > 605.357.5720
> > eric_ortega () gmail com
>
> --
>
>
> Eric R. Ortega
> Network Engineer
> Midcontinent Communications
> 605.357.5720
> eric_ortega () gmail com