Hello,
Here is my code for source-specific extension of Babel using sub-TLV.
https://github.com/boutier/babeld/tree/dev
* Packet format
The sub-TLV format is [ type | length | src-plen | src-prefix]. For now,
I use the value 250 for the sub-tlv source prefix.
* Source-specific wildcard requests
At this point, wildcard requests were treated separately. Legacy
wildcard requests send classical routes only, and source-specific
wildcard requests send specific routes only. The objective was to
let unchanged the behaviour "send routes specified by 6126 on a 6126's
request". To have all routes, you had to send one wildcard request and
one wildcard source-specific request.
The current implementation does not change this behaviour. To have all
routes, you must send one wildcard request (wildcard request without
source sub-TLV) and one source-specific wildcard request (request with
source sub-TLV).
If we keep this behaviour and mix tos-specific routes, we will have
to send 4 wildcard requests to have all routes. I see two reasonable
options:
- only keep (legacy) wildcard requests, and reply with a full dump.
- send one request with all sub-TLVs you know but without mandatory
bit, and reply to all options you know about.
The second is slightly more complex to implement, but may reduce
overhead when a legacy implementation requests a dump to an extended
one. It also implies that mandatory and non-mandatory extension shares
the same space.
You may also want to give guidelines for futures extensions in 6126bis
about this kind of problems.
Any thoughts?
Matthieu
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