Is Caps optional to be supported by nodes?

[nyrahul]

1. Is it needed that all the nodes support caps for it to work?
   a. can it be optional for 6LNs? ... seems it can be optional for 6LNs
   b. can it optional for 6LRs? ... This is tricky and needs to consider both NS-MOP and storing MOP.

In NS-MOP since the DAO directly goes to the root, the intermediate 6LRs are not responsible for handling it and can be made optional. But how will this work with storing MOP where every 6LR, in turn, generates the DAO on behalf of its downstream (sub)child.

Michael's mail in the context

@mcr

[nyrahul]

We have added a bit which says the capabilities could be ignored or whether a node needs to mandatorily handle it based on 'J' flag in the cap option.

The draft is updated for this.