[c-nsp] ip sla echo vrf with df-bit set?

[Christopher Hunt]

I'm trying to setup a mechanism for ensuring end-to-end MTU in our L3 MPLS
VPN network.  I'd like to use ip sla tracking to do so and I have setup a
monitor:

ip sla monitor 99
 type echo protocol ipIcmpEcho x.x.x.x
 request-data-size 1500
 vrf XYZ

Unfortunately, I cannot find any way to set the DF bit using "ip sla
monitor".  Anyone know if it's available anywhere or coming soon?  Can
anyone else think of another strategy?  I'm currently running 12.4(22)T on a
series of 7200VXRs.

Cheer,
Christopher Hunt