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Tuesday, September 24, 2013

Enable Jumbo Frame function of Cisco Nexus 5000 and 7000

An autumn view of Taipei Campus of National Taipei University (NTPU).

For Data Center networking, and in most of the cases, jumbo frames should be enabled. However, Jumbo frame feature is not enabled by default. So the next question would be "How to enable them in Cisco's Data Center switches such as Nexus 5000 and Nexus 7000 families"?

Saturday, September 21, 2013

No more CMP on Nexus 7000 next-generation supervisor modules Sup2 and Sup2E

Connectivity Management Processor (CMP) is like an embedded terminal server dedicated for a single Nexus 7000 data center switch. I personally like this feature because we do not have to prepare another set of terminal server just to monitor the console output while we reboot the switch.

However, starting from Supervisor 2 (Sup2) and Supervisor 2 Enhanced Module (Sup2E), CMP hardware is removed from supervisor module itself.

I am not sure whether this feature will come back in the future or not. For the time being, we will have to prepare terminal servers or reserve asynchronous serial ports for Nexus 7000 switches administration.

[Supervisor 1]

Captured on


CMP Status LED




Link LED




CMP MGMT Ethernet port

Monday, September 2, 2013

Strange "rollback" failure of Cisco Nexus 5500

Left to right: "Taipei 101" and "International Trade Building (ITB)"
Taipei City, Taiwan.

After doing "write erase" and reboot, Cisco Nexus 5500 will fail to rollback even to its previously saved configuration files of checkpoints!

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