[c-nsp] Difference between Partial Route Computation and iSPF

[Arun Kumar]

Hi,

I would like to know is there any functional difference between PRC and
iSPF as far as both OSPF and IS-IS is concerned. I know IS-IS had PRC
feature inherent to its protocol as it has separate TLV for NLRI and
topology information and OSPF was not. Introduction of iSPF made OSPF the
same functionality as PRC in IS-IS. But iSPF is introduced to IS-IS as
well. So

1. introducing iSPF to IS-IS would not make much difference as it already
had PRC?
2. any functional difference between iSPF and PRC?
3. PRC is jargon which is enabled by default or not be enabled or disabled
like iSPF?

thanks in advance
Arun