John (Lo),

So, I see that, when creating a bridge domain using the API
call bridge_domain_add_del, one can specify some feature
flags of the domain as well as the mac-age parameter.

Later, it looks like one can alter the feature flags using the
API call bridge_flags, changing one or more features to be
enabled or disabled on the fly.

However, it looks like there is no mechanism to alter just
the mac-age parameter.

So, a few questions. Is one expected to re-issue the bridge
domain "add" request again, with all the same flag-bits, but
with the new mac-age value? Or is this just a missing API
call that is yet to be added?

In particular, I notice that the code in src/vnet/l2/l2_bd.c has a
command to set a new mac-age, but it doesn't make an API
call to do so; instead it appears to go directly to the underlying
implementation to affect a change.

Any advice here?

Thanks,
jdl

Hi Jon,

Yes, you are right. There is no API to change the aging interval of a BD. It seems when MAC aging support was added to VPP, a new CLI but no API was added to change the aging value of a BD. It should be fairly straightforward to add this new API except we are now in API freeze for 17.04 release. Without a new API, I suppose the only way to change MAC aging in a BD is to use the bridge_domain_add_del API to specify all the feature flags and MAC aging value to overwrite the current BD setting.

Regards,
John