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]
