[rbridge] Critical bits for options

[Joe Touch]

A few lessons from IP (which we may or may not want to emulate):

--------------------------
V6 rules:

- hop-by-hop options MUST come before E2E ones

- unrecognized options have 4 variants indicated via flags:
	- silent pass (skip over silently)
	- silent discard
	- discard w/ICMP
	- discard w/ICMP iff source != multicast

- an additional per-option flag indicates:
	- immutable en-route
	- mutable en-route (i.e., ignore in Auth)

--------------------------
V4 rules:

- unrecognized options
	- silent pass

-------------------------

I'll note that IPv6 doesn't e have a summary bit about critical HBH
options. I don't see why we would anticipate being more complex than
IPv6 in this regard.

IMO, the IPv6 rules are probably sufficient to use as-is.

Joe


-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 250 bytes
Desc: OpenPGP digital signature
Url : http://mailman.postel.org/pipermail/rbridge/attachments/20071205/dda86831/signature.bin