we build network using 7609 sup720 pfc3b sup32 pfc3b and sip400 sip200 pos .
i found a problem, i did't config any policy through mpls vpn LSP path. i use smarbit send 100M traffic into mpls vpn lsp, the lowest bandwidth is 155m pos of this path, when i mark traffic into exp 3. the performance is ok, no lost packet.
when i config ip precedence 5/exp 5. the traffic lost 50% packet.
is there any default behavior for EXP 5 in 7609 sup 720 pfc 3b/pfc 3b