Supervisor Redundancy

Supervisor redundancy reduces unplanned downtime. It enables a quicker switchover between active and standby Supervisor s in the event of a fatal error on the active Supervisor . When you configure Supervisor redundancy, the standby Supervisor is synchronized with the active Supervisor . In the event of a fatal error on the active Supervisor , the system immediately switches to the standby Supervisor .

Finding Feature Information

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.

Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to http://tools.cisco.com/ITDIT/CFN/. An account on http://www.cisco.com/ is not required.

Contents

Hardware Compatibility Matrix for Cisco cBR Series Routers


Note

The hardware components introduced in a given Cisco IOS-XE Release are supported in all subsequent releases unless otherwise specified.

Table 1. Hardware Compatibility Matrix for the Cisco cBR Series Routers

Cisco CMTS Platform

Processor Engine

Interface Cards

Cisco cBR-8 Converged Broadband Router

Cisco IOS-XE Release 3.15.0S and Later Releases

Cisco cBR-8 Supervisor :

  • PID—CBR-CCAP-SUP-160G

  • PID—CBR-CCAP-SUP-60G1

  • PID—CBR-SUP-8X10G-PIC

Cisco IOS-XE Release 3.15.0S and Later Releases

Cisco cBR-8 CCAP Line Cards:

  • PID—CBR-LC-8D30-16U30

  • PID—CBR-LC-8D31-16U30

  • PID—CBR-RF-PIC

  • PID—CBR-RF-PROT-PIC

Cisco cBR-8 Downstream PHY Modules:

  • PID—CBR-D30-DS-MOD

  • PID—CBR-D31-DS-MOD

Cisco cBR-8 Upstream PHY Modules:

  • PID—CBR-D30-US-MOD

1 Effective with Cisco IOS-XE Release 3.17.0S, CBR-CCAP-SUP-60G supports 8 cable line cards. The total traffic rate is limited to 60Gbps, the total number of downstream service flow is limited to 72268, and downstream unicast low-latency flow does not count against the limits.

Prerequisites for Supervisor Redundancy

  • Two Supervisor s (that is, two Supervisor Card s and two Supervisor PIC s) must be installed in the Cisco cBR chassis.

  • Both Supervisor s must be running identical software releases.

Information About Supervisor Redundancy

The Supervisor redundancy feature enables the Cisco cBR router to use two Supervisor s in a redundant configuration, so that if the active Supervisor fails or becomes inactive, the system automatically performs a switchover , where the standby Supervisor takes over and assumes full responsibility for systems operations.

The Supervisor redundancy feature does not require a full reboot of the system to perform a switchover. When the system boots up, the standby Supervisor performs full initialization, which includes self initialization, running configuration synchronization from the active Supervisor , and SSO feature data synchronization from the active Supervisor , then it enters into hot standby state and monitors the active Supervisor . If the standby Supervisor detects a failure in the active Supervisor , it can quickly assume the active responsibility for systems operations.

Each Supervisor contains all the resources required to operate the router, such as bootflash memory, hard disks, Ethernet ports, and console port. In the default operation, the standby Supervisor also synchronizes the major systems files, such as the running configuration file, so that during a switchover, the standby Supervisor can duplicate the active Supervisor ’s configuration.

You can use Cisco IOS CLI commands to access the standby Supervisor resources, such as the bootflash and hard disk. For example, you can use the dir command to list the contents of a device, or use the copy command to transfer files between the active and standby Supervisor .

Switchover Procedure

A switchover occurs when the standby Supervisor takes over responsibilities from the active Supervisor . The switchover can occur automatically if the standby Supervisor has determined that the active Supervisor has failed, or an operator can initiate a manual switchover whenever desired.

A switchover triggers the following events:

  1. If this is a manual switchover, the active Supervisor verifies that the standby Supervisor is present and has entered into SSO. If so, it instructs the standby Supervisor to begin switchover procedures, and the active Supervisor either attempts to reload its configured Cisco IOS software image or enters ROM monitor mode, depending on the setting of its configuration register.

  2. The standby Supervisor assumes responsibility as the active Supervisor and brings the Cisco cBR chassis into active state, and continues the service as active Supervisor .

  3. The new active Supervisor begins normal systems operations, including passing traffic.


    Note

    The Supervisor does not begin functioning as a standby Supervisor until it is booted up with a proper Cisco IOS software.

Is Supervisor Switchover Failing?

The usual phenomenon for a Supervisor switchover to be affected is when the active Supervisor has these issues:

  • Supervisor hangs

  • Login to Supervisor console or Telnet to chassis fails

  • Interface cards unable to connect to active Supervisor , hence crashing

  • Cable modems drop offline

  • Chassis reload required

  • Reset of active Supervisor required to restore service


Note

In case there is hardware issue with the Supervisor , do not reinsert the faulty Supervisor in the chassis. Inserting a faulty Supervisor (although a standby Supervisor ) may cause the interface card to switch to the faulty Supervisor causing the interface card to crash and cable modems to go offline.

Using Redundant File Systems

Both the active and standby Supervisor s have active file systems that can be accessed to store and transfer files. The table below lists the available file systems, the filenames that you can use with CLI commands to access the file systems,and a short description of each.

File System

File Name for CLI Commands

Description

  • Bootflash

  • Flash

  • Hard disk

  • USB

  • Standby bootflash

  • Standby hard disk

  • Standby USB

  • bootflash:

  • flash:

  • harddisk:

  • usb0:

  • usb1:

  • stby-bootflash:

  • stby-harddisk:

  • stby-usb0:

  • stby-usb1:

Stores image, crash file, core files, saved configuration files, and various user files.

  • System

  • Temporary system

  • Null

  • Tar

  • Syslog

  • CNS

  • RCSF

  • system:

  • tmpsys:

  • null:

  • tar:

  • syslog:

  • cns:

  • revrcsf:

Stores the running configuration and other system files.

  • NVRAM

  • Standby NVRAM

  • Standby RCSF

  • nvram:

  • stby-nvram:

  • stby-rcsf:

Typically stores the system default configuration file and startup configuration file.

  • TFTP

  • RCP

  • PRAM

  • FTP

  • HTTP

  • SCP

  • HTTPS

  • tftp:

  • rcp:

  • pram:

  • ftp:

  • http:

  • scp:

  • https:

Protocols used to transfer files to and from remote devices.

You can use the privileged EXEC commands dir , del , and copy to manage the contents of the file systems. You can also use the commands mkdir and rmdir to create and remove directories on bootflash or hard disks.

Following is a sample output of the show file systems command on the Cisco cBR router: 

Router# show file systems

File Systems:

Size(b)       Free(b)      Type  Flags  Prefixes
             -             -    opaque     rw   system:
             -             -    opaque     rw   tmpsys:
*   7800705024    1574408192      disk     rw   bootflash:
    7800705024    1574408192      disk     rw   flash:
   98394218496   79534682112      disk     rw   harddisk:
    8009056256    8009023488      disk     rw   usb1:
      33554432      33507452     nvram     rw   stby-nvram:
             -             -    opaque     rw   null:
             -             -    opaque     ro   tar:
             -             -   network     rw   tftp:
             -             -    opaque     wo   syslog:
      33554432      33508476     nvram     rw   nvram:
             -             -   network     rw   rcp:
             -             -   network     rw   pram:
             -             -   network     rw   ftp:
             -             -   network     rw   http:
             -             -   network     rw   scp:
             -             -   network     rw   https:
             -             -    opaque     ro   cns:
             -             -     nvram     rw   stby-rcsf:
    7800705024    1635270656      disk     rw   stby-bootflash:
   98394218496   89040576512      disk     rw   stby-harddisk:
             -             -      disk     rw   stby-usb0:
    1000787968     301559808      disk     rw   stby-usb1:
             -             -    opaque     rw   revrcsf:

Console Port Usage After Supervisor Switchover

When an active Supervisor fails, and the standby Supervisor becomes the active Supervisor , you must use the console port on the new active Supervisor to give CLI commands and display statistics for the router. The standby Supervisor console is disabled by default and cannot be used to run any CLI commands. Following is an sample output of the standby Supervisor console: 

Router-stby>
Standby console disabled
Router-stby>

To access the console, move the PC or terminal's serial cable to the console port on the other Supervisor , which is now acting as the active Supervisor .

Benefits

  • The Supervisor is not a single point of hardware failure. If a permanent hardware failure in the active Supervisor occurs, the standby Supervisor recovers the system, increasing the level of network service and reliability.

  • The standby Supervisor can become the active Supervisor without the manual intervention of a system operator. This reduces the recovery time and the need for an instant response from the network administrators.

  • The active Supervisor continues to dynamically synchronize the changed configuration and feature data with the standby Supervisor after the system reaches SSO. Therefore, the standby Supervisor always operates as a hot standby and ready to take over.

How to Configure Supervisor Redundancy

The Supervisor redundancy feature is automatically enabled when two Supervisor are installed in the Cisco cBR chassis. The active Supervisor automatically synchronizes the running configuration file with the standby Supervisor during the bootup of standby Supervisor .


Note

The Cisco cBR router supports only the SSO mode for Supervisor redundancy. The default redundancy mode is SSO and this mode does not need any new configurations.

This section contains the following:

Forcing Switchover

To manually force a switchover, so that the standby Supervisor becomes active, use the redundancy force-switchover command in privileged EXEC mode on the active Supervisor . Manually forcing a switchover is useful in the following situations:

  • You need to remove, replace, or upgrade the currently active Supervisor .

  • A previous switchover has activated the standby Supervisor and you now want to restore the previously active Supervisor .


Tip

Simply removing the active Supervisor also triggers a switchover, but using the redundancy force-switchover command does not generate a hardware alarm.

Before you begin

Ensure that the standby Supervisor is in the SSO state using the show redundancy command. For more information, see Verifying Supervisor Redundancy.

Procedure

Step 1

Set the configuration register as 0x02 and the load the appropriate image on both the Supervisor s

Example:

Router# configure terminal
Router(config)# config-register 0x02
Router(config)# boot system bootflash:cbrsup-universalk9.2015-03-08_01.38_xxxxx.SSA.bin
Note 

Do not perform this step if you want to set the previous active Supervisor to stay in ROM monitor mode or manually boot it up after the switchover.

Step 2

Use the redundancy force-switchover command to force the switchover.

Example:

Router# redundancy force-switchover

Proceed with switchover to standby RP? [confirm]
Manual Swact = enabled

Jan 1 19:23:22.483 R0/0: %PMAN-5-EXITACTION: Process manager is exiting: process exit with reload fru code

Initializing Hardware ...

System Bootstrap, Version 12.2(20141120:061458) [153], DEVELOPMENT SOFTWARE
Copyright (c) 1994-2014 by cisco Systems, Inc.
Compiled Thu 11/20/2014 18:04:24.91 by xxxxx

The standby Supervisor becomes the active Supervisor .

Step 3

(Optional) If you have not performed Step 1, the previous active Supervisor is put into the ROM monitor mode after the switchover. To enable the previous active Supervisor to become the new standby Supervisor , manually boot up the new standby Supervisor to enter into SSO mode.

Changing the System Boot Behavior

This section describes how to change the Cisco IOS software configuration register to modify how the system behaviors at power-on or reboot. The software configuration register is a 16-bit register in NVRAM that controls the following boot functions:

  • Specifies the source of the Cisco IOS software image to be loaded
  • Specifies whether the Cisco IOS software should ignore the contents of the saved configuration file in NVRAM memory
  • Enables or disables the use of the Break function

Use the following procedure to change the software configuration register settings:

Procedure

Step 1

Enter global configuration mode and use the config-register command to set the contents of the software configuration register to a new value. You must specify the new value as a 16-bit hexadecimal bitmask, using the values shown in the table below.

Table 2. Definition of Bits in the Software Configuration Register

Bit No.

Hex Value

Meaning/Function

00 to 03

0x0000 to 0x000F

Defines the source of a default Cisco IOS software image required to run the router:

  • 00—On powerup, the system remains at the ROM monitor prompt (rommon>), awaiting a user command to boot the system manually by means of the rommon boot command.
  • 01—On powerup, the system automatically boots the first system image found in the Flash memory single inline memory module (SIMM) on the Supervisor .
  • 02 to 0F—On powerup, the system automatically boots from a default Cisco IOS software image stored on a TFTP server in the network. For this setting, the Network Management Ethernet port on the Supervisor must be configured and operational. This setting also enables boot system commands that override the default filename.

06

0x0040

Causes system software to ignore the contents of the NVRAM configuration file.

07

0x0080

Enables the original equipment manufacturer (OEM) bit.

08

0x0100

Disables the Break function after 30 seconds.

09

0x0200

Not used.

10

0x0400

Specifies that broadcast packets are based on the 0.0.0.0 IP address.

11 and 12

0x0800 to 0x1000

Defines the console baud rate (the default setting is 9600 baud).

13

0x2000

Boots an image from the bootflash memory.

14

0x4000

Specifies that broadcast packets use the subnet broadcast address.

15

0x8000

Enables diagnostic messages and ignores the contents of the NVRAM configuration file.

For example, to configure the router to boot to the ROM monitor prompt, set the configuration register to 0x2100 with the following commands:

Example:


Router# config t
Router(config)# config-register 0x2100
Router(config)#
Tip 

The typical bitmask for normal use is 0x2102, which specifies that the router loads the Cisco IOS software from the Flash memory and boots to the Cisco IOS CLI prompt. The Break key is enabled for only 30 seconds, so that the user can break to the ROM monitor prompt if desired.

Step 2

Exit the global configuration mode by entering the exit command.

Example:

Router(config)# exit
Router#
Step 3

Display the new software configuration register setting using the show version command. The last line shows the settings of the configuration register:

Example:

Router# show version
Cisco IOS XE Software, Version 2015-03-04_00.38_xxxxx
Cisco IOS Software, IOS-XE Software (X86_64_LINUX_IOSD-UNIVERSALK9-M), Experimental  \
Version 15.5(20150302:044048) [v155_2_s_xe315_throttle-xxxxx-XE315_0301 121]
This software is an Engineering Special
Copyright (c) 1986-2015 by Cisco Systems, Inc.
Compiled Wed 04-Mar-15 00:21 by xxxxx


Cisco IOS-XE software, Copyright (c) 2005-2015 by cisco Systems, Inc.
All rights reserved.  Certain components of Cisco IOS-XE software are
licensed under the GNU General Public License ("GPL") Version 2.0.  The
software code licensed under GPL Version 2.0 is free software that comes
with ABSOLUTELY NO WARRANTY.  You can redistribute and/or modify such
GPL code under the terms of GPL Version 2.0.  For more details, see the
documentation or "License Notice" file accompanying the IOS-XE software,
or the applicable URL provided on the flyer accompanying the IOS-XE
software.


ROM: IOS-XE ROMMON

Router uptime is 14 minutes
Uptime for this control processor is 17 minutes
System returned to ROM by SSO Switchover
System image file is "bootflash:cbrsup-universalk9.2015-03-04_00.38_xxxxx.SSA.bin"
Last reload reason: Reload Command



This product contains cryptographic features and is subject to United
States and local country laws governing import, export, transfer and
use. Delivery of Cisco cryptographic products does not imply
third-party authority to import, export, distribute or use encryption.
Importers, exporters, distributors and users are responsible for
compliance with U.S. and local country laws. By using this product you
agree to comply with applicable laws and regulations. If you are unable
to comply with U.S. and local laws, return this product immediately.

A summary of U.S. laws governing Cisco cryptographic products may be found at:
http://www.cisco.com/wwl/export/crypto/tool/stqrg.html 

If you require further assistance please contact us by sending email to
export@cisco.com.
          
cisco cBR1013 (CBR) processor (revision CBR) with 3647635K/6147K bytes of memory.
Processor board ID CSJ13152101
16 Gigabit Ethernet interfaces
32768K bytes of non-volatile configuration memory.
50331648K bytes of physical memory.
7739391K bytes of eUSB flash at bootflash:.
97620247K bytes of SATA hard disk at harddisk:.
979258K bytes of USB flash at usb1:.

Configuration register is 0x2

When you change the configuration register, the show version command shows both the current value of the register, as well as the value that will be used on the next reboot or reload.

Step 4

Perform one of the following to save the configuration file to preserve the new software configuration register settings:

  • Use the copy running-config startup-config command.
  • Use the write command.

Example:

Router# copy running-config startup-config


Router# write
Building configuration...
[OK]
Step 5

The changes to the software configuration register will take effect the next time the router is rebooted or restarted. To manually reboot the router, use the reload command:

Example:

Router# reload
System configuration has been modified. Save? [yes/no]: yes
Proceed with reload? [confirm]

Saving a Configuration File to the Bootflash or Hard Disk

This section describes how to copy a configuration file to a bootflash or hard disk and configure the Cisco cBR router.

Procedure

Step 1

Copy the configuration file to the bootflash or hard disks in both Supervisor s.

Example:

Router# copy running-config bootflash:cbr8-config
Router# copy running-config stby-bootflash:cbr8-config
Router# copy running-config harddisk:cbr8-config
Router# copy running-config stby-harddisk:cbr8-config
Step 2

If the configuration file is currently on a TFTP server, copy the file from the TFTP server to the bootflash or hard disk in each Supervisor .

Example:

Router# copy tftp://192.168.100.10/router-config bootflash:cbr8-config
Router# copy tftp://192.168.100.10/router-config stby-bootflash:cbr8-config
Router# copy tftp://192.168.100.10/router-config harddisk:cbr8-config
Router# copy tftp://192.168.100.10/router-config stby-harddisk:cbr8-config

Verifying the Supervisor Redundancy Configuration

This section contains the following:

Verifying Supervisor Redundancy

Procedure

Step 1

Display the startup configuration and verify that the lines configuring redundancy appear:

Example:

Router# show startup-config

...
redundancy 
mode sso
...
Step 2

Display the current Supervisor redundancy state using the show redundancy command. The active Supervisor typically is shown in slot 4 (SUP0): 

Router# show redundancy

Redundant System Information :
------------------------------
Available system uptime = 28 minutes
Switchovers system experienced = 0
Standby failures = 0
Last switchover reason = none

Hardware Mode = Duplex
Configured Redundancy Mode = sso
Operating Redundancy Mode = sso
Maintenance Mode = Disabled
Communications = Up

Current Processor Information :
-------------------------------
Active Location = slot 4
Current Software state = ACTIVE
Uptime in current state = 28 minutes
Image Version = Cisco IOS Software, IOS-XE Software (X86_64_LINUX_IOSD-UNIVERSALK9-M), Experimental Version 15.5(20150302:044048) [v155_2_s_xe315_throttle-xxxxx-XE315_0301 121]
This software is an Engineering Special
Copyright (c) 1986-2015 by Cisco Systems, Inc.
Compiled Wed 04-Mar-15 00:21 by xxxxx
BOOT = bootflash:cbrsup-universalk9.2015-03-04_00.38_xxxxx.SSA.bin,12;
CONFIG_FILE = bootflash:startup_config1419513118
Configuration register = 0x2

Peer Processor Information :
----------------------------
Standby Location = slot 5
Current Software state = STANDBY HOT
Uptime in current state = 24 minutes
Image Version = Cisco IOS Software, IOS-XE Software (X86_64_LINUX_IOSD-UNIVERSALK9-M), Experimental Version 15.5(20150302:044048) [v155_2_s_xe315_throttle-xxxxx-XE315_0301 121]
This software is an Engineering Special
Copyright (c) 1986-2015 by Cisco Systems, Inc.
Compiled Wed 04-Mar-15 00:21 by xxxxx
BOOT = bootflash:cbrsup-universalk9.2015-03-04_00.38_xxxxx.SSA.bin,12;
CONFIG_FILE = bootflash:startup_config1419513118
Configuration register = 0x2

If a switchover has occurred, the show redundancy command will produce a display similar to the following, showing that the active Supervisor has changed slots that is, moving from slot 4 (SUP0) to slot 5 (SUP1). 

Router# show redundancy

Redundant System Information :
------------------------------
Available system uptime = 39 minutes
Switchovers system experienced = 1
Standby failures = 0
Last switchover reason = user forced

Hardware Mode = Duplex
Configured Redundancy Mode = sso
Operating Redundancy Mode = sso
Maintenance Mode = Disabled
Communications = Up

Current Processor Information :
-------------------------------
Active Location = slot 5
Current Software state = ACTIVE
Uptime in current state = 10 minutes
Image Version = Cisco IOS Software, IOS-XE Software (X86_64_LINUX_IOSD-UNIVERSALK9-M), Experimental Version 15.5(20150302:044048) [v155_2_s_xe315_throttle-xxxxx-XE315_0301 121]
This software is an Engineering Special
Copyright (c) 1986-2015 by Cisco Systems, Inc.
Compiled Wed 04-Mar-15 00:21 by xxxxx
BOOT = bootflash:cbrsup-universalk9.2015-03-04_00.38_xxxxx.SSA.bin,12;
CONFIG_FILE = bootflash:startup_config1419513118
Configuration register = 0x2

Peer Processor Information :
----------------------------
Standby Location = slot 4
Current Software state = STANDBY HOT
Uptime in current state = 4 minutes
Image Version = Cisco IOS Software, IOS-XE Software (X86_64_LINUX_IOSD-UNIVERSALK9-M), Experimental Version 15.5(20150302:044048) [v155_2_s_xe315_throttle-xxxxx-XE315_0301 121]
This software is an Engineering Special
Copyright (c) 1986-2015 by Cisco Systems, Inc.
Compiled Wed 04-Mar-15 00:21 by xxxxx
BOOT = bootflash:cbrsup-universalk9.2015-03-04_00.38_xxxxx.SSA.bin,12;
CONFIG_FILE = bootflash:startup_config1419513118
Configuration register = 0x2

If the standby Supervisor is not installed or is not operational, the show redundancy command will produce a display similar to the following: 

Router# show redundancy

Redundant System Information :
------------------------------
Available system uptime = 31 minutes
Switchovers system experienced = 1
Standby failures = 0
Last switchover reason = user forced

Hardware Mode = Simplex
Configured Redundancy Mode = sso
Operating Redundancy Mode = Non-redundant
Maintenance Mode = Disabled
Communications = Down Reason: Failure

Current Processor Information :
-------------------------------
Active Location = slot 5
Current Software state = ACTIVE
Uptime in current state = 2 minutes
Image Version = Cisco IOS Software, IOS-XE Software (X86_64_LINUX_IOSD-UNIVERSALK9-M), Experimental Version 15.5(20150302:044048) [v155_2_s_xe315_throttle-xxxxx-XE315_0301 121]
This software is an Engineering Special
Copyright (c) 1986-2015 by Cisco Systems, Inc.
Compiled Wed 04-Mar-15 00:21 by xxxxx
BOOT = bootflash:cbrsup-universalk9.2015-03-04_00.38_xxxxx.SSA.bin,12;
CONFIG_FILE = bootflash:startup_config1419513118
Configuration register = 0x2

Peer (slot: 4) information is not available because it is in 'DISABLED' state
Note 

The show redundancy command shows the redundancy state, software state, system uptime, image version, boot, configuration file, and configuration register information.

Verifying Supervisor Switchover

Procedure

Step 1

Verify the LEDs on the Supervisor Card . When a Supervisor becomes active, the RP ACT and FP ACT LEDs on the Supervisor Card illuminate green to indicate that they have initialized and acting as the active Supervisor . The RP ACT and FP ACT on standby Supervisor Card are off. For more information, see Monitoring the Supervisor in the Cisco cBR Chassis.

Step 2

To verify that a switchover has occurred, use the show redundancy switchover history command. Assuming that the original Supervisor had been in slot 4 (SUP0), and that the standby Supervisor is in slot 5 (SUP1), the following is the sample output:

Example:

Router# show redundancy switchover history

Index Previous Current Switchover Switchover
      active   active  reason     time
----- -------- ------- ---------- ----------
1     48       49      user forced 19:23:11 CST Sun Jan 1 2012

where, 48 indicates SUP0 and 49 indicates SUP1.

Configuration Example for Supervisor Redundancy

The following example shows the relevant portion of the Cisco IOS configuration file for the default configuration for the Supervisor redundancy feature, which should be used for most applications: 

Router# show running-config | sec redundancy

redundancy
	mode sso

Router#

Additional References

Related Documents

Related Topic Document Title
CMTS commands Cisco IOS CMTS Cable Command Reference
Stateful Switchover Stateful Switchover

Technical Assistance

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Feature Information for Supervisor Redundancy

Use Cisco Feature Navigator to find information about platform support and software image support. Cisco Feature Navigator enables you to determine which software images support a specific software release, feature set, or platform. To access Cisco Feature Navigator, go to http://tools.cisco.com/ITDIT/CFN/. An account on http://www.cisco.com/ is not required.


Note

The below table 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.

Table 3. Feature Information for Supervisor Redundancy

Feature Name

Releases

Feature Information

Supervisor Redundancy

Cisco IOS-XE Release 3.15.0S

This feature was introduced on the Cisco cBR Series Converged Broadband Router s.