Jumbo Frames

Hello,  I have the folowing 6513E modules on v15.0(1)SY1:

Mod Ports Card Type                              Model              
--- ----- -------------------------------------- ------------------ -----------
  1   16  CEF720 16 port 10GE                    WS-X6816-10GE      
  2   16  CEF720 16 port 10GE                    WS-X6816-10GE      
  3   48  CEF720 48 port 10/100/1000mb Ethernet  WS-X6748-GE-TX    
  4   48  CEF720 48 port 10/100/1000mb Ethernet  WS-X6748-GE-TX    
  5   48  CEF720 48 port 10/100/1000mb Ethernet  WS-X6748-GE-TX    
  6   48  CEF720 48 port 10/100/1000mb Ethernet  WS-X6748-GE-TX    
  7    5  Supervisor Engine 2T 10GE w/ CTS (Acti VS-SUP2T-10G      
  8    5  Supervisor Engine 2T 10GE w/ CTS (Hot) VS-SUP2T-10G      
  9   16  CEF720 16 port 10GBaseT                WS-X6816-10T      
 10   16  CEF720 16 port 10GBaseT                WS-X6816-10T      
 11   48  CEF720 48 port 10/100/1000mb Ethernet  WS-X6748-GE-TX    

The 2 WS-X6816-10GE modules are connecting to a new EMC storage system.  We would like to implement jumbo frames on these ports.  After reading the Configuration guide, it appears that L2 ports MTU is set by the Global LAN port MTU size setting and that it is not possible to set only the MTU for the 10G fiber ports on the X6816 line cards for jumbo frames without affecting all other ports.

Is this an accurate assessment?

TIA,
Bob
bslatteryAsked:
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pergrCommented:
You have to configure it both globally, and on each interface.

Actually, it would not make sense to do it only on the interface to the storage systems - you would want to do it also towards the servers. Unless you will only use it for replication between storage systems.

Point 5.1 here:
http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps708/prod_white_paper0900aecd805457cc.html
which is about global config, and some about the interfaces.

and there, more about interface config:
http://www.cisco.com/en/US/products/hw/switches/ps700/products_configuration_example09186a008010edab.shtml#c1
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bslatteryAuthor Commented:
Thank you pergr, I am evaluating your response and reading your url references.

Sincerely,
Bob
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rauenpcCommented:
Just a thought... enabling jumbo frames merely allows devices to use jumbo frames. It doesn't require devices to use jumbo frames. It is a standard practice for me to enable jumbo frames on all switches that support it so that I never come across a need for jumbo frames and the inability to do a switch reload to enable them.
I have yet to run across a situation where a problem exists simply because jumbo frames were enabled on a port that didn't need jumbo frames.
What it boils down to for me, is that enabling jumbo frames shouldn't be a concern. The required reboot could be a concern, but globally enabling jumbo frames shouldn't.
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bslatteryAuthor Commented:
Thank you gentlemen.  rauenpc, that was the informatin I was looking for that I was finidng it hard to glean from the documentation.  However, the documentation references provided by pergr provided very useful information and after reading the confiuration for Jumbo frames on my code version (15.0), I will be moving forward with enabling jumbo frames.

Thank you
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