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The line cards support high availability with redundancy schemes. Line card redundancy can help limit customer premises equipment (CPE) downtime by enabling robust automatic switchover and recovery in the event that there is a localized system failure.
Your software release may not support all the features documented in this module. For the latest feature information and caveats, see the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the Feature Information Table at the end of this document.
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Note | The hardware components introduced in a given Cisco IOS-XE Release are supported in all subsequent releases unless otherwise specified. |
The line cards installed in slot 3 and 6 of the Cisco cBR-8 router cannot be configured as the secondary card.
The RF Protect PIC can send RF signals only to the lower slots (with larger slot number). So, the slot number of the secondary card must be the smallest in the redundancy group.
Note | We recommend that you install the RF Protect PIC in the uppermost slot (slot 0) of the chassis and configure it as the secondary card. |
The RF Through PIC can send RF signal only from upper slot to lower slot. So, do not install any RF blank PICs between the secondary card and primary cards.
You cannot change any configuration on the primary or secondary card when the secondary card is active.
You cannot remove the last primary card if there is a secondary card in the redundancy group. You must remove the secondary card and then remove the primary card.
If the primary card is in the standby role, you must revert to the primary card before removing it from the redundancy group.
Line card redundancy reduces the unplanned downtime. When you configure line card redundancy, a protect zone (redundancy group) is created on the router and the configurations on the primary cards are synchronized with the secondary card.
The following events can trigger a switchover from an active card to a standby card:
Manual switchover using the redundancy linecard-group switchover from slot slotcommand.
Line card reload using the hw-module slot reload command.
Line card crash.
Line card Online Insertion and Removal (OIR).
The secondary card reloads after the switchover. The router can be configured to automatically revert to the primary card when it becomes hot standby after an unplanned switchover triggered by the line card OIR or crash.
Following are the line card redundancy states:
Unavail—The line card state is not available.
Init—The line card did not boot up.
Active Cold—The active card is downloading the configuration.
Active—The active card is fully configured and working.
Stdby Cold—The standby card configuration is synchronizing with the active card.
Stdby Warm—(Only for the secondary card) The standby card is fully synchronized and ready for switchover. It is the stable state of a secondary standby card.
Stdby Hot—The primary standby card is fully synchronized. It is the stable state of a primary standby card. The secondary standby card is chosen to switchover for a primary card, and will be active soon. It is a transient state when secondary card is becoming active.
The Cisco cBR-8 router supports N+1 redundancy scheme for line cards. A single RF Protect PIC can be configured as a secondary card for multiple RF Through PICs (primary cards). In this redundancy scheme, when the secondary card becomes the active card for a primary card, the redundancy scheme is changed to 1+1 redundancy.
The Cisco cBR-8 router supports a single protect zone or redundancy group (group 0).
This section contains the following:
The line card must be in active role, and warm standby or hot standby state. Use the show redundancy linecard all command to verify the role and state of the card.
Restrictions
Command or Action | Purpose |
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show redundancy linecard group all—Displays the redundancy group information.
The following is a sample output of this command:
Router# show redundancy linecard group all Group Identifier: 0 Revertive, Revert Timer: OFF (60000 sec) Reserved Cardtype: 0xFFFFFFFF 4294967295 Group Redundancy Type: INTERNAL SWITCH Group Redundancy Class: 1:N Group Redundancy Configuration Type: LINECARD GROUP Primary: Slot 6 Primary: Slot 7 Secondary: Slot 0
show redundancy linecard all—Displays the role and state information for all line cards.
Following is a sample output of this command:
Router# show redundancy linecard all LC My Peer Peer Peer Slot Subslot Group State State Slot Subslot Role Mode ------------------------------------------------------------------------------- 9 - 0 Active Stdby Cold 0 - Active Primary 8 - 0 Active Stdby Warm 0 - Active Primary 7 - 0 Active Stdby Warm 0 - Active Primary 6 - 0 Active Stdby Cold 0 - Active Primary 3 - 0 Active Stdby Cold 0 - Active Primary 2 - 0 Active Stdby Cold 0 - Active Primary 1 - 0 Active Stdby Cold 0 - Active Primary 0 - 0 - - Multiple None Standby Secondary
Note | The secondary card does not have a valid My State when it is in Standby role as it is the peer for N primary cards. The secondary card has N peer states. For example, it can be cold standby for some primary cards and warm standby for the other primary card. |
Following is a sample output of the command when secondary card becomes active for a primary card, and the N+1 redundancy is changed to 1+1 redundancy:
Router# show redundancy linecard all LC My Peer Peer Peer Slot Subslot Group State State Slot Subslot Role Mode ------------------------------------------------------------------------------- 9 - 0 Stdby Hot Active 0 - Standby Primary 8 - 0 Active Unavail 0 - Active Primary 7 - 0 Active Unavail 0 - Active Primary 6 - 0 Active Unavail 0 - Active Primary 3 - 0 Active Unavail 0 - Active Primary 2 - 0 Active Unavail 0 - Active Primary 1 - 0 Active Unavail 0 - Active Primary 0 - 0 Active Stdby Hot 9 - Active Secondary
show redundancy linecard slot—Displays the redundancy information for the line card.
Following is a sample output of the command:
Router# show redundancy linecard slot 9 LC Redundancy Is Configured: LC Group Number: 0 LC Slot: 9 (idx=9) LC Peer Slot: 0 LC Card Type: 0x4076 , 16502 LC Name: 9 LC Mode: Primary LC Role: Active LC My State: Active LC Peer State: Stdby Warm
show redundancy linecard history—Displays the state change history for all line cards.
Following is a sample output of the command:
Router# show redundancy linecard history Jan 05 2012 12:24:27 20559 - st_mem(9): MY State Change, (Active Wait) -> (Active) Jan 05 2012 12:24:27 20559 - st_mem(9): MY FSM execution, Active Wait:Init:State Ntfy Jan 05 2012 12:24:27 20559 - st_mem(9): MY State Change, (Active LC Cfg Dnld) -> (Active Wait) Jan 05 2012 12:24:27 20559 - st_mem(9): MY FSM execution, Active LC Cfg Dnld:Init:Cfg Dnld Done Jan 05 2012 12:24:27 20559 - st_mem(9): MY State Change, (Active Cold) -> (Active LC Cfg Dnld) Jan 05 2012 12:23:09 12763 - st_mem(9): MY FSM execution, Active Cold:Init:Cfg Dnld Jan 05 2012 12:23:09 12760 - st_mem(9): MY State Change, (Init) -> (Active Cold) Jan 05 2012 12:23:09 12760 - st_mem(9): MY FSM execution, Init:Init:Up Jan 05 2012 12:21:39 3746 - st_mem(9): PEER FSM Execution , Init:Init:Reset
show lcha rfsw—Displays the internal RF switch PIC state information.
Following is a sample output of the command:
Router# show lcha rfsw Slot 0 ==================================== Type : Secondary PIC State: normal Slot 1 ==================================== Type : Primary PIC State: normal
show lcha logging level—Displays the cable modem line card logs.
Following is a sample output of the command:
Router# show lcha logging level noise 11:02:03.313 CST Tue Nov 18 2014 [error] [slot=3] [txn=229] Peer-Up Message [tag=1011] to slot 3 complete [36144 ms]; status=nak response 11:02:03.313 CST Tue Nov 18 2014 [error] [slot=0] [txn=229] Slot 0 downloaded configuration for slot 3; result=peer-up notification failed 11:02:03.316 CST Tue Nov 18 2014 [noise] [slot=0] [txn=none] lcha_plfm_get_max_port_count_for_slot: slot 0 maximum port count is 1794 11:02:03.316 CST Tue Nov 18 2014 [noise] [slot=0] [txn=none] lcha_plfm_get_starting_port_index: slot 0 starting port count is 0 11:02:03.331 CST Tue Nov 18 2014 [note] [slot=0] [txn=none] Slot 0 is being reset 11:02:04.352 CST Tue Nov 18 2014 [note] [slot=0] [txn=none] slot 0 removed
When the secondary card is active, you can use the slot number of either the primary or secondary card in the show commands.
Following is a sample output of the show interfaces command after the primary card in slot 8 switches over to secondary card in slot 0:
Router# show interfaces c0/0/0 Cable0/0/0 is up, line protocol is up Hardware is CMTS MD interface, address is 0000.0000.031e (bia 0000.0000.031e) MTU 1500 bytes, BW 26000 Kbit/sec, DLY 1000 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation MCNS, loopback not set Keepalive set (10 sec) ARP type: ARPA, ARP Timeout 04:00:00 Last input never, output never, output hang never Last clearing of "show interface" counters never Input queue: 0/375/0/0 (size/max/drops/flushes); Total output drops: 0 Queueing strategy: weighted fair Output queue: 0/1000/64/0 (size/max total/threshold/drops) Conversations 0/0/256 (active/max active/max total) Reserved Conversations 0/0 (allocated/max allocated) Available Bandwidth 19500 kilobits/sec 5 minute input rate 0 bits/sec, 0 packets/sec 5 minute output rate 13000 bits/sec, 17 packets/sec 0 packets input, 0 bytes, 0 no buffer Received 0 broadcasts (0 multicasts) 0 runts, 0 giants, 0 throttles 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort 140520 packets output, 14052672 bytes, 0 underruns 0 output errors, 0 collisions, 1 interface resets 0 unknown protocol drops 0 output buffer failures, 0 output buffers swapped out Router# show interfaces c8/0/0 Cable0/0/0 is up, line protocol is up Hardware is CMTS MD interface, address is 0000.0000.031e (bia 0000.0000.031e) MTU 1500 bytes, BW 26000 Kbit/sec, DLY 1000 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation MCNS, loopback not set Keepalive set (10 sec) ARP type: ARPA, ARP Timeout 04:00:00 Last input never, output never, output hang never Last clearing of "show interface" counters never Input queue: 0/375/0/0 (size/max/drops/flushes); Total output drops: 0 Queueing strategy: weighted fair Output queue: 0/1000/64/0 (size/max total/threshold/drops) Conversations 0/0/256 (active/max active/max total) Reserved Conversations 0/0 (allocated/max allocated) Available Bandwidth 19500 kilobits/sec 5 minute input rate 0 bits/sec, 0 packets/sec 5 minute output rate 14000 bits/sec, 18 packets/sec 0 packets input, 0 bytes, 0 no buffer Received 0 broadcasts (0 multicasts) 0 runts, 0 giants, 0 throttles 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort 140616 packets output, 14062272 bytes, 0 underruns 0 output errors, 0 collisions, 1 interface resets 0 unknown protocol drops 0 output buffer failures, 0 output buffers swapped out
When the secondary card is active, the show running-config command displays the output for the secondary card.
Note | The output of the show running-config command is empty for the primary card when the secondary card is active. |
Following is a sample output of the show running-config command after the primary card in slot 8 switches over to secondary card in slot 0:
Router# show running-config | begin controller Upstream-Cable 0 controller Upstream-Cable 0/0/0 us-channel 0 channel-width 1600000 1600000 us-channel 0 docsis-mode atdma us-channel 0 minislot-size 4 us-channel 0 modulation-profile 221 no us-channel 0 shutdown us-channel 1 channel-width 1600000 1600000 us-channel 1 docsis-mode atdma Router# show running-config | begin controller Upstream-Cable 8 Router# Router#
Related Topic | Document Title |
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CMTS commands | Cisco CMTS Cable Command Reference |
Description | Link |
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Note | The table below lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature. |
Feature Name |
Releases |
Feature Information |
---|---|---|
Line Card Redundancy |
Cisco IOS-XE Release 16.4.1 |
This feature was integrated into Cisco IOS-XE Release 16.4.1 on the Cisco cBR Series Converged Broadband Routers. |