If we use the EF-PHB with green as drop probability all P routers need
not know about the PTP LSP. This has been stated in the PTP over MPLS
draft.
Given that forwarders are work conserving, a packet that has already
started will go to completion, so a high priority packet arriving after
the transmit decision has been taken by the forwarder waits. The now
devalued timing packet goes ahead of all other packets, some of which
are less devalued by the delay. I am worried that giving timing packet
priority degrades the network without achieving anything for the timing
system.
Do we have any measured evidence that sending timing packets with a high
priority is actually beneficial? If so can someone please point me at it.
Thanks
Stewart
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