Table Of Contents
Enhancement to the show standby Command
Contents
Additional References
Related Documents
MIBs
Technical Assistance
Command Reference
show standby
Enhancement to the show standby Command
The output of the show standby command has been revised, making the output clearer and easier to use. No other changes to the Cisco IOS software were made.
Feature History for Enhancement to the show standby Command
Release
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Modification
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12.2(8)T
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This feature was introduced.
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12.2(25)S
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This feature was integrated into Cisco IOS Release 12.2(25)S.
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Contents
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Additional References
•Command Reference
Additional References
The following sections provide references related to the Enhancement to the show standby Command feature.
Related Documents
Related Topic
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Document Title
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IP addressing and services
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•Cisco IOS IP Command Reference, Volume 1 of 3: Addressing and Services, Release 12.2
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MIBs
MIBs
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MIBs Link
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No new or modified MIBs are supported by this feature and support for existing MIBs has not been modified by this feature.
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To locate and download MIBs for selected platforms, Cisco IOS releases, and feature sets, use Cisco MIB Locator found at the following URL:
http://www.cisco.com/go/mibs
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Technical Assistance
Description
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Link
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Technical Assistance Center (TAC) home page, containing 30,000 pages of searchable technical content, including links to products, technologies, solutions, technical tips, and tools. Registered Cisco.com users can log in from this page to access even more content.
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http://www.cisco.com/public/support/tac/home.shtml
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Command Reference
This section documents the modified show standby command.
•show standby
show standby
To display Hot Standby Router Protocol (HSRP) information, use the show standby command in privileged EXEC mode.
show standby [type number [group-number]] [active | init | listen | standby] [brief]
Syntax Description
type number
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(Optional) Interface type and number for which output is displayed.
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group-number
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(Optional) Group number on the interface for which output is displayed.
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active
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(Optional) Displays HSRP groups in the active state.
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init
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(Optional) Displays HSRP groups in the initial state.
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listen
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(Optional) Displays HSRP groups in the listen or learn state.
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standby
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(Optional) Displays HSRP groups in the standby or speak state.
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brief
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(Optional) Summarizes each standby group as a single line of output.
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Command Modes
Privileged EXEC
Command History
Release
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Modification
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10.0
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This command was introduced.
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12.1(3)T
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The following keywords were added:
•active
•init
•listen
•standby
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12.2(8)T
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The output for the command was made clearer and easier to understand.
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12.2(25)S
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This command was integrated into Cisco IOS Release 12.2(25)S.
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Examples
The following is sample output from the show standby command:
2 state changes, last state change 00:30:59
Virtual IP address is 10.1.0.20
Secondary virtual IP address 10.1.0.21
Active virtual MAC address is 0004.4d82.7981
Local virtual MAC address is 0004.4d82.7981 (bia)
Hello time 4 sec, hold time 12 sec
Next hello sent in 1.412 secs
Preemption enabled, min delay 50 sec, sync delay 40 sec
Standby router is 10.1.0.6, priority 75 (expires in 9.184 sec)
Priority 95 (configured 120)
Down Interface Ethernet0/2, pri 15
Down Interface Ethernet0/3
IP redundancy name is "HSRP1", advertisement interval is 34 sec
The following is sample output from the show standby command with an interface and the init and brief keywords specified:
Router# show standby ethernet0/1 1 init brief
Interface Grp Prio P State Active addr Standby addr Group addr
Et0 0 120 Init 10.0.0.1 unknown 10.0.0.12
Table 1 describes the significant fields shown in the displays.
Table 1 show standby Field Descriptions
Field
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Description
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Ethernet - Group
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Interface type and number and Hot Standby group number for the interface.
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State is
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State of the local router; can be one of the following:
•Active—Indicates the current Hot Standby router.
•Standby—Indicates the router next in line to be the Hot Standby router.
•Speak—Router is sending packets to claim the active or standby role.
•Listen—Router is not in the active nor standby state, but if no messages are received from the active or standby router, it will start to speak.
•Init or Disabled—Router is not yet ready or able to participate in HSRP, possibly because the associated interface is not up. HSRP groups configured on other routers on the network that are learned via snooping are displayed as being in the Init state. Locally configured groups with an interface that is down or groups without a specified interface IP address appear in the Init state. For these cases, the Active addr and Standby addr fields will show "unknown." The state is listed as disabled in the fields when the standby ip command has not been specified.
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Virtual IP address is, Secondary virtual IP address
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All secondary virtual IP addresses are listed on separate lines. If one of the virtual IP addresses is a duplicate of an address configured for another device, it will be marked as "duplicate." A duplicate address indicates that the router has failed to defend its ARP (Address Resolution Protocol) cache entry.
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Active virtual MAC address
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Virtual MAC address being used by the current active router.
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Local virtual MAC address
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Virtual MAC address that would be used if this router became the active router. The origin of this address (displayed in parentheses) can be "default," "bia" (burned-in address), or "confgd" (configured).
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Hello time, hold time
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The hello time is the time between hello packets (in seconds) based on the standby timers command. The hold time is the time (in seconds) before other routers declare the active or standby router to be down, based on the standby timers command. All routers in an HSRP group use the hello-time and hold-time values of the current active router. If the locally configured values are different, the variance appears in parentheses after the hello-time and hold-time values.
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Next hello sent in
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Time at which the Cisco IOS software will send the next hello packet (in hours:minutes:seconds).
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Preemption enabled
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Indicates whether preemption is enabled. If enabled, the minimum delay is the time for which a higher-priority nonactive router will wait before preempting the lower-priority active router. The sync delay is the maximum time for which a group will wait to synchronize with the IP redundancy clients.
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Active router is
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Value can be "local," "unknown," or an IP address. Address (and the expiration date of the address) of the current active Hot Standby router.
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Standby router is
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Value can be "local," "unknown," or an IP address. Address (and the expiration date of the address) of the "standby" router (the router that is next in line to be the Hot Standby router).
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expires in
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Time (in hours:minutes:seconds) in which the standby router will no longer be the standby router if the local router receives no hello packets from it.
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Tracking
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List of interfaces that are being tracked and their corresponding states. Based on the standby track command.
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IP redundancy name
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Name of the IP redundancy and advertisement interval, in seconds.
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Related Commands
Command
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Description
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standby authentication
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Configures an authentication string for the HSRP.
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standby ip
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Activates the HSRP.
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standby mac-address
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Specifies the virtual MAC address for the virtual router.
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standby mac-refresh
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Refreshes the MAC cache on the switch by periodically sending packets from the virtual MAC address.
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standby preempt
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Configures HSRP preemption and preemption delay.
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standby priority
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Configures Hot Standby priority of potential standby routers.
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standby timers
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Configures the time between hello messages and the time before other routers declare the active Hot Standby or standby router to be down.
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standby track
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Configures an interface so that the Hot Standby priority changes based on the availability of other interfaces.
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standby use-bia
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Configures HSRP to use the BIA of the interface as its virtual MAC address, instead of the preassigned MAC address (on Ethernet and FDDI) or the functional address (on Token Ring).
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Copyright © 2003 Cisco Systems, Inc. All rights reserved.
