On Tue, Sep 11, 2012 at 11:58 AM, Saleha Asad <[email protected]> wrote:
> Hey,
>
> I am currently working on implementing NVGRE. I had certain questions in my
> mind which I think could be cleared through discussion.
> My understanding of NVGRE is that on the sender side when we add the NVGRE
> header we set a particular VSID for the packet. This VSID is assigned on the
> basis of the policy which contains a lookup table maintained by the
> administrator. A lookup is performed and the VSID corresponding to the
> particular MAC address and IP address is added in the NVGRE header and the
> packet is sent on the tunnel. On the receiver side the VSID is extracted
> from the NVGRE header and again a lookup is performed on the table
> maintained at the receiver side. If the VSID of the receiving packet is
> found from the table and the corresponding MAC and IP addresses are matched
> then the packet is further processes otherwise discarded.
> Please could anyone point out if I am wrong at some point or if I am missing
> something. I wanted to know that what is the basis of this assignment of
> VSID, are they just random 24 bit numbers set my the administrator or is
> there some standard to follow while allotting VSIDs.

I believe it's undefined but really the draft RFC is the authoritative
source here.
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