A quick question on serial interfaces. Is it really necessary to have sub interfaces on point-to-point connections? I understand the need when running ATM or frame or something of the sort, but for a standard ppp config with one ip? why would you need to confuse things any farther? i keep seeing configs with sub interfaces and just wonder if i am doing something wrong or what.
For a basic "non-channelized" point-to-point ckt connection you do not need to have subinterfaces. If you have say a T1 controller or external CSU/DSU you can add an IP to the repsective Serial interface an add whatever encapsulation you like.
However, if you have a circuit that has channelized connections off of it you will need the subinterfaces (e.g you have a T3 that is channellized into 28 T1s (all point-to-point) you would need to have that many sub-interfaces).
HDLC is default encap type for Serial interfaces. If the enccap matches both ends you should be okay. You don't need a subinterface for PPP to work either.
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...