Re: [pim] PIM BSR semantic fragementation.

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

Gan wrote:
> Hi,
>
> I have couple of questions regarding BSR semantic fragmentation.
>
> 1. Suppose if the BSR packet is divided into 5 fragments and sent, how 
> does the receiving router know that the end of the packet is reached. Is 
> there any field in the BSR fragment which states the end of fragment is 
> received.

There is no way to know that you've received all fragments (apart from 
possibly seeing a new fragment tag), but you don't need to.
> 2. And once the BSR is received, what is the receiving router supposed 
> to do. Should it wait till all the fragements are recieved and then it 
> should multicast the bootstrap message. or it can just keep mcasting the 
> fragements as and when they are received.

I think they should be multicasted/forwarded as soon as they are received.

> 3. Do any of you have issues with respect to implementing the BSR 
> semantic fragementation.

When using the contents of the BSMs, I would not worry about receiving 
all fragments of the BSM, but receiving complete group ranges. By 
looking at the rp-count field, you know when you have a complete group 
range. As soon as you do, you can then use the content to update your 
RP-set. You should IMO not try to wait and see if more fragments come along.

Stig

> Regards,
> -G
>
>
>
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