[pim] draft-ietf-pim-sm-bsr-08

[Stig Venaas <stig.venaas at uninett.no>]

Based on the feedback at the wg meeting and later on the list, I've made 
some changes and submitted a new version (draft-ietf-pim-sm-bsr-08).

I've added what I call no-forward multicast BSMs that should be 
supported (replacing unicast BSMs), but kept unicast BSMs that may be 
supported for backwards compatibility. But see the text for the exact 
details. The main changes are in the processing checks, including the 
pseudo-code, and the chapter for sending BSMs to new and restarting 
routers. Re-sending of unicast BSMs (you might call it forwarding) has 
been explicitly made optional.

Also as agreed at the meeting, I've removed use of Router Alerts. They 
were introduced in an early revision of this draft, they are not in 
2362. This has resulted in significant changes in the security 
considerations.

I haven't tried to make unicast BSMs more secure, I think it's best if 
they are backwards compatible with 2362, while using the no-forward 
multicast BSMs as the more secure alternative.

Stig

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