Hot Swapping The Ar040 Nsm With Pics Installed; Behaviour Of Hot Swapped Interfaces - Allied Telesis AT-AR020 PRI E1/T1 Hardware Reference Manual

38 Port Interface Card
Hot Swapping the AT-AR040 NSM with
PICs Installed
Caution You cannot hot swap PICs. Before installing or removing a PIC from a
PIC bay in a switch or router, you must disconnect all power sources to the
switch or router. To install or remove a PIC from an AR040 NSM, you must first
either physically remove the NSM from the switch or router using the hot swap
method, or disconnect all power sources to the switch or router.
Hot swapping is the installation or removal of a component such as an NSM
without powering down or restarting the switch or router. You can hot swap
the AT-AR040 NSM on a switch or router running Software Version 2.3.1 or
later. To find out which version your switch or router is running, use the
command:
show install
You can hot swap the AT-AR040 NSM with PICs installed in its PIC bays. There
is no need to remove the PICs before hot swapping the NSM.
When an AR040 NSM with PIC cards is hot swapped out, and an identical
combination of AR040 and PICs is hot swapped into the same bay, the software
configurations for the PIC interfaces are preserved across the hot swap. In this
case, software modules configured to the PIC interfaces transfer to the newly
swapped in interfaces.
When an AR040 NSM with PICs is hot swapped out and a different
combination of AR040 and PICs is hot swapped into the same bay, new
interface instances are created for any new PIC types or PIC types that are in
different bays, and the old interface instances are discarded. For any PIC in the
combination that is replaced by a PIC of the same type, interface instances are
preserved.
The recessed Hot Swap button must be used when hot swapping NSMs. See
the Network Service Module Installation and Safety Guide for the correct procedure
for hot swapping the AR040 NSM.

Behaviour of Hot Swapped Interfaces

When an NSM is hot swapped out, its interface instances become dormant.
They stay dormant until either another interface of the same type is hot
swapped into the bay, in which case they are reactivated, or an interface of a
different type is hot-swapped into the bay, in which case they are discarded.
Dormant interfaces are included in the show interface command output
(Figure 30 on page 39 and Figure 31 on page 39) and in the SNMP interfaces
MIB, marked as swapped out. In other router or switch commands, however,
the router or switch behaves as though dormant interfaces do not exist.
Instances of higher-level modules such as LAPD, Q931, ISDN call control, PPP,
and IP do not become dormant when an interface becomes dormant. Instead
they behave as if the interface has stopped communicating, for example, as if
the cable has been unplugged.
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