[Sls-slp] New RID to Space Link Identifiers Pink Sheets

[Greg Kazz]

All,

I've just written a RID against the current pink sheets (P2.1) on Space 
Link Identifiers. I've added IPv4 to the list of protocol ID to be 
recognized by CCSDS for Encapsulation by the Encapsulation Service. (Table 7.7)

Rational:  Enable a migration path for missions starting out with IPv4 and 
upgrading to IPv6. If CCSDS provides for a protocol ID for IPv4, then it 
can be put into an encapsulation packet, which is currently required for 
IPv6 datagrams. Otherwise, missions are forced to insert IP datagrams into 
the CCSDS link layer using two different mechanism: 1) directly into the 
frame for IPv4 and 2) encapsulation packets for IPv6.

Please let me know if you have any issues or concerns about this proposed 
change.

I've attached the modified pink sheet.

thanks,

Greg
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