[j-nsp] sudden jump in ping response time

[CHEN Xu]

Hi guys,

I am using multiple logical routers on a juniper router, they are
connected through logical tunnels, or VLANs, or L2VPN, etc.

When I ping from one logical router to another, I always see some
glitch in ping response time, like this:

64 bytes from 1.1.2.1: icmp_seq=153 ttl=64 time=1.015 ms
64 bytes from 1.1.2.1: icmp_seq=154 ttl=64 time=1.018 ms
64 bytes from 1.1.2.1: icmp_seq=155 ttl=64 time=1.048 ms
64 bytes from 1.1.2.1: icmp_seq=156 ttl=64 time=0.988 ms
64 bytes from 1.1.2.1: icmp_seq=157 ttl=64 time=36.950 ms  <----
64 bytes from 1.1.2.1: icmp_seq=158 ttl=64 time=1.004 ms
64 bytes from 1.1.2.1: icmp_seq=159 ttl=64 time=1.005 ms
64 bytes from 1.1.2.1: icmp_seq=160 ttl=64 time=1.003 ms

This almost always happens in all setups that I played with. Does
anyone know what's going on and how to fix it?

Thanks!
-Simon