VRRPv3 and Timer Enhancements Drafts - advertisement format

Hi, 

I was reading draft-ietf-vrrp-ipv4-timers-02 as well as 
draft-ietf-vrrp-ipv6-spec-07.  I have two comments:   

1) It seems that the VRRP advertisement format in the IPv6 
spec could be very similar to the format as proposed in 
draft-ietf-vrrp-ipv4-timers-02 (except version=3, not 2).  

The advantages are similar parsing, support of second, 
centisec, and millisec timers, and adding support for 
specifying the number of lost packets before declaring 
failure.  This would also set up the IPv6 spec to also 
support fast timers (version=3, type = 2) - and if this 
is the direction it seems that for IPv6 the two drafts 
could then be merged.    

2) Also, there is some discussion on the list about 
whether a wider AIG field is good in order to support more 
granular timer units (microsecs was mentioned) - I think 
for this to be useful a larger advertisement-interval (20 
bits) is needed as well.  Something like the below seems 
fairly future proof in terms of fast timers (note AIG 
is wider by a bit and Adv-Cnt could be wider as well if 
that is desirable). 

    0                   1                   2                   3
    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |Version| Type  | Virtual Rtr ID|   Priority    | Count IP Addrs|
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |  (rvsd) |Adv Cnt| AIG |               Adver Int               |  
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |        (rvsd)                 |          Checksum             |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |       IPv4 Address (1) or start of IPv6 Address(1)            |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                            .                                  |
   |                            .                                  |
   |                            .                                  |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |       IPv4 Address (n) or end of IPv6 Address (n)             |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

Comments please.

Regards,
Steve    

Stephen Nadas                           Ericsson IPI       
[email protected]              920 Main Campus Dr. 
Voice:  +1-919-472-9935 Fax: x/9999     Suite 500 
Mobile: +1-919-522-0991 ECN: 802 29935  Raleigh, NC 27606


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