[MEXT] A comment on draft-ietf-mext-binding-revocation-00

Hi All,

IMO following case is possible with PMIPv6 protocol
defined in http://tools.ietf.org/html/draft-ietf-mext-binding-revocation-00
and http://tools.ietf.org/html/draft-ietf-netlmm-proxymip6-18

lt = lifetime
eth0 is the interface og MAG to the LAN in
which MN1 is present. MAG has another
interface eth1 through which it is connected to LMA.

MN1 ---- eth0 MAG eth1 -------LMA

            MAG                LMA
             |                  |
             |                  |
             |                  |
 eth0 down   |                  |
             |\ BRI(G)          |
 eth0 up     | \                |
(MN1 attaches)|  \     PBU(lt!=0)|
             |----------------->|
             |   \      +-------|
             |    \    /        |
             |     +----------->|
             |       /  +-------|
             | BRA  /  /        |
             |<----/--+         |
             |    /             |
             |   /              |
             |<-+               |
             | PBA              |
(BUL entry for MN1)           (no BCE MN1)

Reason -
1. As per these drafts BRI and PBU has their own
  (independent) sequence numbers.
2. BRI/BRA does not have timestamp option.
3. These drafts do not say that PBU cannot be sent
  if MAG has already sent BRI(G) to LMA.
4. In IP network missequencing of packets is possible.

Thanks and Regards,
Sandesh