The MPLS WG Archive

[Yakov Rekhter <yakov@cisco.com>]

Mike,

> Hello,
> 	In draft-kompella-mpls-unnum-02.txt, the interface ID field is shown
> to be 16 bits.  Previous e-mails have suggested that the size be increased
> to 32 bits to match the SNMP ifIndex size.  Can this be increased?  

Please bear in mind that the interface index (interface ID) is carried
not just in RSVP/CR-LDP, but in OSPF as well. 

In OSPF with unnumbered links interface ID is carried in the same field
as a plain IP address. At the same time one still need to be able to
distinguish between the case when this field carries an IP address and
the case when this field carries an interface ID. So if we allow interface
ID to be 32 bits, then when this field carries the value 33620225, is
that an IP address (2.1.1.1) or an interface ID (33620225) ?

Yakov.