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 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: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
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Eric R. Ortega Network Engineer Midcontinent Communications 605.357.5720 eric_ortega@gmail.com
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Eric R. Ortega Network Engineer Midcontinent Communications 605.357.5720 eric_ortega@gmail.com