[c-nsp] 802.1w vs EoMPLS failover time

[Walter Keen]

I've got a jitter-sensitive application (voice DS3 over some RAD 
equipment) that we are testing, and I've got a rapid spanning tree ring 
through the below network.  We have it down to during a spanning tree 
switchover (tested by adjusting the rapid-pvst cost on the trunk 
interface), and curious if people feel if EoMPLS with a mpls-TE tunnel 
would provide faster convergence in case of a failure, given a fairly 
vanilla OSPF as the IGP, and 2 explicit paths defined (A-D, then A-B-D), 
as the endpoints of this application are at A and D.

I think I'm going to start testing this tomorrow or next week, but 
curious if anyone had any thoughts or suggestions.  HW is 7600/RSP720 at 
A and B, 7600/SUP720 at D and C, all with 6724sfp cards for core-facing 
interfaces, and 6148 card (10/100) for RAD-facing interfaces.

Network looks like

A-------------------D
\------B-----------/
 \----------C-----/

Or, A has a connection to D, A has a connection to B and C, B has a 
connection to D, C has a connection to D.