Juniper

EX Switches

Helpful CLI commands

ifmon

Time-elapsing interface counters: i/o bytes, i/o packets, errors, etc.
Pass the interface name when calling the command.

Usage: ifmon [-v] [-JL <lrname>] [interface]

What do the other flags do..?

iftop

Time-elapsing overview of interface counters: for all interfaces
Gives each port's rate in pps or bps, etc.

Usage: iftop [-v] [-d]

• -v : shows version
• -d : same as running without arguments, but adds interface descriptions

Semi-hidden debug interfaces

lcdd: Line Card Daemon

"lcdd" from a shell (not the cli) connects you to various other parts of the switch,
including the software forwarding infrastructure (sfid), chassis manager (chassism),
and the virtual chassis system (vccpd). You don't need to be root to get into these.
The general idea is:

 > lcdd 0 <area>

Where area is one of the above/below items. The digit (0) is the FPC slot number. EX switches only have FPC0.