[j-nsp] MX960 - DPCE cards / CPU usage

[Dario Amaya]

Hello,

We're running a couple of MX960 in our datacenter, carrying a full
table in BGP and running full MPLS services, fast-reroute/RSVP/LDP
etc. There are two LSP's in full mesh with two other routers. (the
960's are not edge routers, so no peering/transit terminate on them).

Hardware as follows:

2x RE-S-2000-4096-S
2x DPCE-R-20GE-2XGE
2x MPC-3D-16XGE-SFPP

The RE's are on 16.2R2-S11 which is the last service release supported
on these RE's. I wasn't sure if 17.3R3 supported 32-bit, or would even
work at all on these RE's?

I'm seeing the CPU on the DPC's hitting 100% in spikes every 5-10
minutes or so, which we did not see on JUNOS 13.3. The most concerning
thing is that we're seeing some packet-loss on traffic transiting the
DPC's at the same time. 1 to 2% packet loss every 10 minutes or so
through the router. This of course does not occur on the MPC which
runs smoothly with no spikes. There's no more than 400Mbps transiting
the router.

> show pfe statistics traffic fpc 6 | match discard
Packet Forwarding Engine hardware discard statistics:
    Timeout                    :                    0
    Normal discard             :               217186
    Extended discard           :                    0

What would you suggest here? Is this being caused by the JUNOS version
we're running?

Any tips appreciated.

Thanks