6500 Jumbo Frames

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We are having issues with throughput between two hosts over a 1GB link, I have gone through the normal process of the checking the circuit with the carrier. errors on the port speed/duplex mis match, tcp window size etc.

I am exploring the possibilty of using Jumbo frames but have seen the 6500's don't support jumbo frames?????. Is this correct and can anyone offer advice or point me in the direction of the document on the implementation of Jumbo frames?


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Jon Marshall Mon, 03/15/2010 - 08:28
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With the 6500 it is linecard dependant but the 6500 definitely does support Jumbo frames -

Catalyst jumbo frame support


Reza Sharifi Mon, 03/15/2010 - 08:58
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This 10/100/1000 card does support jumbo frames:

WS-X6748-GE-TX for Enterprise and Service Provider Data Centers

As the premier modular multilayer Cisco switch for integrated data center switching, the Cisco Catalyst 6500 Series now offers a new, high-performance 48-port 10/100/1000 Ethernet over copper module designed specifically for use with the Cisco Catalyst 6500 Series Supervisor Engine 720 in data center and distribution layer deployments.

The WS-X6748-GE-TX features a 40-Gbps interconnection to the Cisco Catalyst 6500 Series Supervisor Engine 720's switch fabric-ideal for high-demand, high-density Gigabit Ethernet requirements across all 48 ports.

Other Key Features include:

· Up to 386 high-performance 10/100/1000 Ethernet over copper ports in a single Cisco Catalyst 6500 Series chassis

· Flexible, scalable, field-upgradable daughter card options to support full locally distributed forwarding through the DFC3A for investment protection and "pay as you grow" performance

· Jumbo frame support, up to 9000 bytes, commonly required in data centers.


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