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6 Release Note
Software Release 2.3.1
C613-10325-00 REV B
NSM Hot Swap Software Support
When a card is hot-swapped out of a bay, its interface instances become
dormant. They stay dormant until either another card of the same type is hot-
swapped into the bay, in which case they are reactivated, or a card of a different
type is hot-swapped into the bay, in which case they are destroyed.
Dormant interfaces are included in the SHOW INTERFACE command output
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 and Q931, ISDNCC, PPP, and
IP, that are attached to an interface that becomes dormant, do not themselves
become dormant. They behave as if the interface has stopped communicating,
for example as if its cable has been unplugged.
The router does not scan the configuration script for commands relating to interfaces on
hot-inserted cards until the router or switch is restarted. These interfaces must be
configured manually.
The router or switch does not update the MAC address of any hot-swapped Ethernet
interface until the router or switch is restarted.
The SHOW INTERFACE command is modified to show “Swapped out” in the
ifOperStatus column for dormant interface instances.
All other commands that show or set board or interface properties behave as if
swapped-out boards and interfaces do not exist. Commands that operate on
multiple boards or interfaces skip swapped-out boards and interfaces, and
commands to which a dormant interface is specified explicitly fail in their
usual way for a non-existent interface.
Figure 1: Example output from the SHOW INTERFACE command.
Interfaces sysUpTime: 00:00:46
DynamicLinkTraps.....Disabled
TrapLimit............20
Number of unencrypted PPP/FR links.....0
ifIndex Interface ifAdminStatus ifOperStatus ifLastChange
------------------------------------------------------------------------------
1 eth0 Up Up 00:00:03
2 eth1 Up Down 00:00:00
3 bri0 Up Swapped out 00:00:43
4 eth2 Up Swapped out 00:00:42
------------------------------------------------------------------------------
Interface name summary
Interface Full name
------------------------------------------------------------------------------
asyn0 asyn0
asyn1 asyn1
eth0 eth0
eth1 eth1
------------------------------------------------------------------------------