As an aside, the 6-port GigE card is not oversubscribed. Mike
-- Michael K. Smith - CISSP, GISP Chief Technical Officer - Adhost Internet LLC [email protected] w: +1 (206) 404-9500 f: +1 (206) 404-9050 PGP: B49A DDF5 8611 27F3 08B9 84BB E61E 38C0 (Key ID: 0x9A96777D) > -----Original Message----- > From: Philip Lavine [mailto:[email protected]] > 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 <[email protected]> > To: Philip Lavine <[email protected]> > 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 <[email protected]> > >To: Philip Lavine > ><[email protected]> > >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 > >[email protected] > > > > -- > > > Eric R. Ortega > Network Engineer > Midcontinent Communications > 605.357.5720 > [email protected] > > >
