[c-nsp] 10GE card for 7609

[Brian Mengel]

This got me curious, so I did a bit of digging.

http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps708/product_data_sheet09186a00801dce34.html

WS-X6704-10GE - 16MB port buffers
WS-X6708-10G-3CXL - 200 MB port buffers

http://www.cisco.com/en/US/prod/collateral/routers/ps368/data_sheet_c78-49152.html

7600-ES+4TG3CXL - 512MB port buffers



On Tue, Mar 31, 2009 at 4:37 PM, Jason Lixfeld <jason at lixfeld.ca> wrote:
> Looks like the 6708 isn't as bad as we think.
>
> On 2009-03-31, at 4:12 PM, Richard A Steenbergen <ras at e-gerbil.net> wrote:
>
>> On Tue, Mar 31, 2009 at 10:01:24AM +0200, Gergely Antal wrote:
>>>
>>> I meant that you can not push 40G out of a 6704
>>> even with a dfc attached to it.But you can do it with a 6708
>>> with 1:1 subscription.
>>
>> Worse, some days you can't even get 7G in from a single port on a 6704
>> with the other 3 ports unused. We routinely have problems with ingress
>> interface overruns or egress interface output queue overflows on 6704
>> in that traffic range, and DFC doesn't make any difference.
>>
>> It seems like it is head of line blocking, and TAC's only answer is
>> "those things have no buffers, buy a 6708". The problem can usually be
>> worked around by changing the way traffic is being mapped between the
>> ports. For example, the one that seems to be the absolute worst case is
>> "in one port and out the other on the same fabric channel", i.e. in port
>> 1 and out port 2 or the same thing on 3/4.
>>
>> --
>> Richard A Steenbergen <ras at e-gerbil.net>       http://www.e-gerbil.net/ras
>> GPG Key ID: 0xF8B12CBC (7535 7F59 8204 ED1F CC1C 53AF 4C41 5ECA F8B1 2CBC)
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