How about the following text:
To establish an targeted LDP session with a candidate PQ node the
repairing node (S) needs to know what IP address PQ is willing to use
for targeted LDP sessions. Ideally this is provided by PQ advertising
this address in the IGP in use. Which address is used, how this is
advertised in the IGP, and whether this is a special IP address or an IP
address also used for some other purpose is out of scope for this
document and must be specified in an IGP specific RFC.
In the absence of a protocol to learn the prefered IP address for
targetted LDP, a tie-breaking mechanism is required. Unless otherwise
configured, an LSR should attempt a targeted LDP session with the IP
address with the lowest numerical value advertised by the target LSR. To
determine the lowest numerical value the address is taken in network
byte order and cast to an integer of appropriate size.
(in case you are wondering about the appropriate size, it to have common
v4 and v6 text)
- Stewart
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