Use the show redundancy command to verify whether the "Shelf is redundant" string is displayed on a redundancy-enabled access server, as illustrated below:
Router# show redundancyT1 1/0 is up. Applique type is Channelized T1 Cablelength is long gain36 0db No alarms detected. alarm-trigger is not set Version info of slot 3: HW: 256, PLD Rev: 1 Framer Version: 0x8Manufacture Cookie Info: EEPROM Type 0x0001, EEPROM Version 0x01, Board ID 0x02, Board Hardware Version 1.0, Item Number 32-0-00, Board Revision 00, Serial Number 12059498, PLD/ISP Version <unset>, Manufacture Date 19-Jun-1999. Framing is ESF, Line Code is AMI, Clock Source is Line. Trunk setting is rbs-zero. Data in current interval (619 seconds elapsed): 380 Line Code Violations, 171 Path Code Violations 0 Slip Secs, 0 Fr Loss Secs, 137 Line Err Secs, 10 Degraded Mins 137 Errored Secs, 21 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs Total Data (last 24 hours) 203903 Line Code Violations, 27284 Path Code Violations, 7 Slip Secs, 531 Fr Loss Secs, 18414 Line Err Secs, 1431 Degraded Mins
The following example shows output from two router shelves configured as a failover pair. The active router shelf is initially RouterA. The commands show redundancy history and show redundancy have been issued. The show redundancy command shows that failover is enabled and shows the configured group number. The show redundancy command also shows that this router shelf is the active one of the pair. Compare this output with that from the backup router shelf (RouterB) further below.
When RouterA is reloaded, thereby forcing a failover, new entries are shown on RouterB when a show redundancy history command is issued after failover has occurred.
Log from the First Router Shelf (RouterA):
RouterA#RouterA# show redundancy historyDSC Redundancy Status Change History:010215 18:17 Slot -1 DSC:Failover configured -> ACTIVE role by default.010215 18:18 Slot -1 DSC:Failover -> BACKUP role.010215 18:18 Slot 12 DSC:Failover -> ACTIVE role.010215 18:18 Slot 12 DSC:Hub, becoming active - arb timeoutRouterA#RouterA# show redundancyfailover mode enabled, failover group = 32Currently ACTIVE role.DSC in slot 12:Hub is in 'active' state.Clock is in 'active' state.No connection to slot 13RouterA#RouterA# reloadProceed with reload? [confirm]*Feb 15 20:19:11.059:%SYS-5-RELOAD:Reload requestedSystem Bootstrap, Version 11.1(13)CA, EARLY DEPLOYMENT RELEASE SOFTWARE (fc1)Copyright (c) 1997 by cisco Systems, Inc.C7200 processor with 131072 Kbytes of main memoryrommon 1 >
Log from the Second Router Shelf (RouterB):
RouterB#RouterB# show redundancyfailover mode enabled, failover group = 32Currently BACKUP role.No connection to slot 12DSC in slot 13:Hub is in 'backup' state.Clock is in 'backup' state.RouterB#*Feb 16 03:24:53.931:%DSC_REDUNDANCY-3-BICLINK:Switching to DSC 13*Feb 16 03:24:53.931:%DSC_REDUNDANCY-3-BICLINK:Failover:changing to active mode*Feb 16 03:24:54.931:%DIAL13-3-MSG:02:32:06:%DSC_REDUNDANCY-3-EVENT:Redundancy event:LINK_FAIL from other DSC*Feb 16 03:24:55.491:%OIR-6-INSCARD:Card inserted in slot 12, interfaces administratively shut down*Feb 16 03:24:58.455:%DIAL13-3-MSG:02:32:09:%DSC_REDUNDANCY-3-EVENT:Redundancy event:LINK_FAIL from other DSC*Feb 16 03:25:04.939:%DIAL13-0-MSG:RouterB# show redundancyfailover mode enabled, failover group = 32Currently ACTIVE role.No connection to slot 12DSC in slot 13:Hub is in 'active' state.Clock is in 'backup' state.RouterB# show redundancy historyDSC Redundancy Status Change History:010216 03:09 Slot -1 DSC:Failover configured -> BACKUP role.010216 03:24 Slot 13 DSC:Failover -> ACTIVE role.010216 03:24 Slot 13 DSC:Hub, becoming active - D12 linkfail010216 03:24 Slot 13 DSC:Hub, becoming active - D12 linkfailRouterB#*Feb 16 03:26:14.079:%DSIPPF-5-DS_HELLO:DSIP Hello from shelf 47 slot 1 Succeeded*Feb 16 03:26:14.255:%DSIPPF-5-DS_HELLO:DSIP Hello from shelf 47 slot 3 Succeeded*Feb 16 03:26:14.979:%DSIPPF-5-DS_HELLO:DSIP Hello from shelf 47 slot 10 Succeeded