g709 enable command rejected even though it is documented

[AARON WEINTRAUB]

#show configuration failed
Thu Oct  1 23:22:55.992 UTC
!! SEMANTIC ERRORS: This configuration was rejected by
!! the system due to semantic errors. The individual
!! errors with each failed configuration command can be
!! found below.

controller dwdm0/0/1/4
 g709 enable
!!% Invalid argument: Not supported

Running IOS 5.3.1 + SMUs

http://www.cisco.com/c/en/us/td/docs/routers/asr9000/software/asr9k_r5-3/interfaces/command/reference/b_interfaces_cr53xasr9k/b_interfaces_cr53xasr9k_chapter_01.html#wp3469562612

The command was accepted on 4.3.4.  What happened?

[Eddie Chami]

Aaron,

Use this CLI to enable OTN mode on 40G & 100G. 

On 10G, use ‘transport-mode’ CLI under the interface to configure OTN/WANPHY modes. 

Eddie.

[AARON WEINTRAUB]

We can do that, but XR needs to provide a migration path for these CLI commands, as doing an upgrade from 4.3.4 to 5.3.1 kicks out the configuration as invalid if these commands are in place.

[AARON WEINTRAUB]

Looks like this check was in place as part of CSCuo68315.  This breaks direct migrations from 4.3.4 to 5.1.3 and later unless the command is removed first.