Subject: Re: [Mipshop] Re: CBA (was Re: RR enhancements)

From: Greg Daley <[email-masked]>
Date: Fri, 01 Apr 2005 00:01:17 +1000

Hi Christian, 

----- Original Message -----
From: Christian Vogt <[email-masked]>
Date: Thursday, March 31, 2005 6:45 pm
Subject: Re: [Mipshop] Re: CBA (was Re: RR enhancements)

> Hi Greg,
> 
> ok, let's see.
> 
> After a handover, the MN can do one of three things...
> 
> Case (1):  If the MN wants the CN to temporarily redirect packets 
> to the 
> HoA, it can just send a standard BU with lifetime == 0 and CoA == 
> HoA. 
> (I think this message should have a HoA destination option and a 
> Alternate CoA option, both carrying the HoA?  See 5th paragraph on 
> page 
> 133, RFC 3775...)

Well, the CoA == HoA isn't necessary and constrains the solution
to go via the Home Agent.

> Case (2):  If the MN wants the CN to start sending packets to the 
> new, 
> unverified CoA immediately, it will have to send an EBU.
> 
> Case (3):  If the MN wants the CN to continue sending packets to 
> the old 
> CoA, it simply refrains from sending any early message, but does 
> the CoA 
> test (plus the HoA test if this has not already been done on a 
> proactive 
> basis), and subsequently sends a standard BU with positive lifetime.
> 
> This leaves the choice of where packets go to with the MN.
> 
> In cases (1) and (2) can the MN do a proactive HoA test (which it 
> needs 
> for both the standard BU with zero lifetime and the EBU) and, 
> subsequently, a concurrent CoA test followed by a standard BU with 
> positive lifetime.
> 
> Case (2) is where CBA comes into play.  CBA may lead the CN to 
> deny a 
> particular EBU.  (There is no default fallback option in such a 
> case. 
> Probably, the CN should drop packets until it receives the 
> standard BU 
> rather than sending them to the HoA?)

I don't see any problem with continuing to send packets to the old link.

This is what would be done if only a CoTI had been received.

Greg 

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