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Friday, April 19, 2013

How do you change number of internal port-channel on Nexus 5000?

We are in the middle of a Nexus 5000 project and recognized today while configuring port-channels, that some of the interface numbers are reserved for internal use.

Is it possible to change or configure which port-channel interface numbers are allocated for internal use by NX-OS?

Unfortunately we were not able to find a solution for this issue in the official Nexus documentation, the search function of this forum or Google. If we did miss something or didn't look careful enough at the Nexus docs, We are also happy with RTFM (... fine manual) responses and links to the info. Thanks.
 
Nexus5k(config)# interface port-channel 128
ignored port-channel128: internally used, configuration not allowed

Port-Channels 111, 113, 115, 119, 121, 200, 211, 222 were created manually, but 127 - 129 were not.

Nexus5k# show port-channel usage
Total 11 port-channel numbers used
============================================
Used  :   111 , 113 , 115 , 119 , 121 , 127 - 129 , 200 , 211 , 222
Unused:   1 - 110 , 112 , 114 , 116 - 118 , 120 , 122 - 126 , 130 - 199
          201 - 210 , 212 - 221 , 223 - 4096
          (some numbers may be in use by SAN port channels)

Unfortunately it is not currently possible to adjust which internal Port-channel numbers are used for interaction with the L3 daughter card, although only 127 and 128 should be used for that purpose (not sure what the Po129 in your configuration refers to). There is an open internal enhancement CSCtl19659 to consider allowing such configuration in the future.

Just FYI, if Po127 & 128 are configured before installing the L3 daughter card or activating the license, the system will use other free channel numbers, but for various reasons that is not recommended.



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