Cisco 10 GIG SFP Problems

I am having an issue with 10 gig interfacing between a 6507 Core Switch with a 4 port 10 Gig  optical blade using SC GBIC's connecting to a Nexus 5548 using 10 Gig optical SFP's.

The link is configured as a Trunk link and is passing traffic.  The issue is with MTU...no packet larger than 255 bytes will pass.

6507 -  SC -------------------------------------LC  NEXUS

GBIC    -------------------------------------------  SFP

10/GIG OPTICAL  _  -----------------   10 GIG OPTICAL

TRUNK ----------------------------------------- TRUNK

The solution:

You can set upto 9216 bytes of MTU size in Nexus.(jumbo frames)

http://www.cisco.com/en/US/products/ps9670/products_configuration_example09186a0080b44116.shtml

but the factor depends on ASIC..

You may be interested in configuring jumbo frame on 6500 series

Configure in CatOS

    Cat6509≶ (enable) set port jumbo

    Usage: set port jumbo <mod/port> <enable|disable>

    Cat6509> (enable) set port jumbo 1/1 enable

    Jumbo frames enabled on port  1/1.

    Cat6509> (enable) 2002 May 29 12:34:35 %PAGP-5-PORTFROMSTP:

    Port 1/1 left bridge port 1/1

    2002 May 29 12:34:38 %PAGP-5-PORTTOSTP:Port 1/1 joined bridge port 1/1

Verify in CatOS

    Cat6509> (enable) show port jumbo

    Jumbo frames MTU size is 9216 bytes.

    Jumbo frames enabled on port(s) 1/1,9/1.

keep MTU size same at two ends.

Or if not interested in jumbo..simply configure the mtu size to 1500 b

You may check for the commands on ur switches

Something like

Switch(config)# mtu.

The Cisco module you may want to know, please click the below links:

WS-X4748-RJ45-E

WS-X4748-RJ45V+E