PIC hotswap

From JuniperClue

It is possible to hot swap PICs in most Juniper routers, though in the M20 and M40 it is physically difficult to do so.

Before hot swapping a PIC it is necessary to 'offline' the PIC using either the CLI (request chassis pic offline fpc-slot x pic-slot y) or a front panel button.

The PIC can then be removed, and replaced with either the same or a different type.

Once the new PIC has been inserted it must be brought online, again using either the CLI or front panel button.

Note that on 'traditional' M series routers (i.e. up to and including the M160) there will be an interruption to the packet forwarding across the FPC when a PIC is brought offline, due to the system restructuring the internal memory to account for this.