[c-nsp] WS6548 pericles with port/ether-channels

[Tom Sands]

The architecture of the 6548 card is pretty close to the 6148 card.. The 
important thing for you is knowing that both of them are over subscribed 
8:1 and have shared buffer space per 8 ports.  So the card only has a 
8Gbps switch fabric total.

read the CEF265 characteristics more again, just because the classic bus 
is 32Gbps, doesn't mean the card itself can sustain that.

The Cisco Catalyst 6500 Series Cisco Express Forwarding 256 10/100 and 
10/100/1000 interface modules offer the following operational advantages 
and characteristics:

• Forwarding architecture-These modules use the central Cisco Express 
Forwarding engine located on the supervisor engine.

• Forwarding performance-These modules forward packets up to 30 Mpps per 
system and up to 15 Mpps per slot if upgraded to support distributed 
forwarding.

• Fabric connection-These modules connect to the switch fabric through 
one 8-Gbps connection and the 32-Gbps shared bus.



The 6748 is subscribed at 1.2:1 (40Gbps) with dedicated buffers per port


------------------------------------------------------
Tom Sands			  				
Chief Network Engineer				
Rackspace Managed Hosting	    	
(210)447-4065		   	
------------------------------------------------------


Moerman, Maarten wrote:
> Sorry for my outlook not correctly quoting (Quotefix doesn't work for
> some reason)
> 
> However, the 6548 has a 32gbit shared bus. My thoughts where that it
> should be possible to have 2 * 8gb and 1 * 2gb running on that.
> 
> On the 6148's I do not have problems, as I'll be using them only for
> connecting normal 1gbit ports, without much traffic on it.
> 
> I just found out that the 6748's are only about 1k more then the 6548's,
> so it shouldn't be a big problem, however, I find the cisco not very
> clear on this.
> 
> Maarten
> 
> -----Original Message-----
> From: Will Hargrave [mailto:will at harg.net] 
> Sent: Tuesday, December 05, 2006 11:55 AM
> To: Moerman, Maarten
> Cc: cisco-nsp at puck.nether.net
> Subject: Re: [c-nsp] WS6548 pericles with port/ether-channels
> 
> Moerman, Maarten wrote:
> 
> 
>>I just bought these freakin expensive WS6548GE-TX boards, in order to
>>correctly implement portchannels ,and get rid of the 1gb limit the
>>6148's have. As been told by the cisco site, the cisco site also
>>mentioned that the 6548's do not have ratelimit problems. So I'm
>>implementing those.... 
> 
> 
> 1gb limit on 6148? it has a classic bus (32gbit) connection. What
> problems have you been having with these?
> 
> 
>>I needed to have 2 port channels of 8gb and one of 2gb. Is this
> 
> possible
> 
>>in my configuration? I have 7604's with Sup730-3BXL, no money spared
> 
> on
> 
>>those. And now I've found out that after the cisco site giving me
> 
> wrong
> 
>>information, I can't get this fixed. 
> 
> 
> 6548 is a CEF256 card.. they have a single 8Gbps fabric and a 32Gbps
> shared 'classic' bus connection.
> 
> http://www.cisco.com/en/US/products/hw/modules/ps4835/products_data_shee
> t0900aecd8017376e.html
> 
> Not what you wanted to hear, but you should have really bought
> WS-X6748-GE-TX. 67xx cards have CEF720 fabric connections (2x20G) which
> means they operate optimally with SUP720.
> 
> Will
> 
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