[c-nsp] 1G SFPs in built-in 10G ports on ASR9001

[Rich Lewis]

Hi

We have a new ASR9001 and this is our first experience of the ASR9K series and IOS-XR, so please forgive any stupid newbie errors! :-)

We're trying to hook it up to an ASR1002 via 1G SX SFPs. We can get this to work if we use one of the 1G ports on a 20x GE MPA card (though it took us a while to figure out that you needed the 'negotiation auto' command under the interface!), but we can't get it to work if we use the built-in 10G interfaces. There appears to be no similar 'negotiation auto' command on the 10G interface; we did find the 'transceiver permit pid all' command, but to no avail.

The SFP is a genuine labelled Cisco part (GLC-SX-MMD) and according to this list should be compatible in the 10G port: http://www.cisco.com/c/en/us/td/docs/interfaces_modules/transceiver_modules/compatibility/matrix/OL_6981.html#pgfId-206339

We're running 5.1.2.

Do you need some other special sauce to make a 1G SFP work in a 10G port?

Thanks
Rich.


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