Port numbering in FBOSS Python Tool output about fboss

[capveg]

Hi and thanks for the feedback.

A little bit of context first:

There are really two sets of port numbers - the numbers on the front panel ports (which you're looking for) and the numbers on the Broadcom chip. Unfortunately, on most platforms due to the way they optimize board layout (e.g., to minimize trace lengths, minimize EMF interference, etc.), the front panel ports do not map 1:1 with the Broadcom chip ports.

If you look at the portId field in the PortInfoThrift structure (which is what's being read by the list_ports command), that's reporting the Broadcom port Ids. The name, however (e.g., eth1/1/1), should match the port you care about.

Does that help?

FYI:
https://github.com/facebook/fboss/blob/master/fboss/agent/if/ctrl.thrift#L262

[ggiamarchi]

Of course it helps. Thank you for your response, that makes sense. I was expecting this kind of explanation.

By the way, in my case the field name is always empty. How it is supposed to be populated ?

[bluecmd]

@ggiamarchi I cannot answer authoritively, but when making LLDP output useful stuff we had to set a port name ourselves and we resorted to this: https://github.com/dhtech/fboss/blob/f8c87a0d2855acdcf92e358bc900200cfa1a31bf/etc/wedge.json#L57. Maybe that works here as well?

[ggiamarchi]

Yes it works, thank you @bluecmd. I didn't pay attention to this attribute in the configuration spec...