IP Addresses and Services Command Reference for Cisco NCS 5500 Series, Cisco NCS 540 Series, and Cisco NCS 560 Series Routers - HSRP commands [Cisco Network Convergence System 5500 Series] (2024)

To enable hot standby protocol for IP, use the address (hsrp) command in the HSRP group submode. To disable hot standby protocol for IP, use the no form of this command.

address { learn | address }

no address { learn | address }

Command Default

None

Command Modes

HSRP Group Submode

Usage Guidelines

No specific guidelines impact the use of this command.

Example

This example shows how to enable a group to learn the primary virtual IPv4 address from received HSRP control packets:

Router# configure Router(config)# router hsrp Router(config-hsrp)# interface tenGigE hundredgige 0/4/0/4Router(config-hsrp-if)# address-family ipv4Router(config-hsrp-ipv4)# hsrp 1 version 2Router(config-hsrp-gp)# address learnRouter(config-hsrp-gp)#

Note	The version keyword is available only if IPv4 address-family is selected. By default, version is set to 2 for IPv6 address families. The HSRP version 2 extended group range must be restricted to 0-255, even though the configuration up to 0-4095 is accepted.

Note	Starting with IOS XR Release 7.4.1, the HSRP version 2 extended group range configurable in the router is restricted to 0-255.

Related Commands

To configure the global virtual IPv6 address for the HSRP group, use the address global command in the virtual router submode. To deconfigure the global virtual IPv6 address for the HSRP group, use the no form of this command.

address global ipv6-address

no address global ipv6-address

Command Default

None

Command Modes

HSRP Group Submode, under the IPv6 address-family

Usage Guidelines

No specific guidelines impact the use of this command.

Example

This example shows how to add a global virtual IPv6 address for the HSRP group:

Router# configure Router(config)# router hsrp Router(config-hsrp)# interface tenGigE 0/4/0/4Router(config-hsrp-if)# address-family ipv6Router(config-hsrp-address-family)# hsrp 3 Router(config-hsrp-virtual-router)# address global 4000::1000 Router(config-hsrp-virtual-router)#

Note	The version keyword is available only if IPv4 address-family is selected. By default, version is set to 2 for IPv6 address families. The HSRP version 2 extended group range must be restricted to 0-255, even though the configuration up to 0-4095 is accepted.

Note	Starting with IOS XR Release 7.4.1, the HSRP version 2 extended group range configurable in the router is restricted to 0-255.

To configure the global virtual IPv6 address for the subordinate group, use the address global command in the HSRP slave submode. To deconfigure the global virtual IPv6 address for the subordinate group, use the no form of this command.

address global ipv6-address

no address global ipv6-address

Command Default

None

Command Modes

HSRP Slave Submode, under the IPv6 address-family

Usage Guidelines

No specific guidelines impact the use of this command.

Example

This example shows how to add a global virtual IPv6 address for the subordinate group:

Router# configure Router(config)# router hsrp Router(config-hsrp)# interface tenGigE 0/4/0/4Router(config-hsrp-if)# address-family ipv6Router(config-hsrp-address-family)# hsrp 3 slaveRouter(config-hsrp-virtual-router)# address global 4000::1000 Router(config-hsrp-virtual-router)#

Note	The version keyword is available only if IPv4 address-family is selected. By default, version is set to 2 for IPv6 address families. The HSRP version 2 extended group range must be restricted to 0-255, even though the configuration up to 0-4095 is accepted.

Note	Starting with IOS XR Release 7.4.1, the HSRP version 2 extended group range configurable in the router is restricted to 0-255.

To either configure the virtual link-local IPv6 address for the HSRP group or to specify that the virtual link-local IPv6 address should be enabled and calculated automatically from the virtual router virtual Media Access Control (MAC) address, use the address linklocal command in the HSRP group submode, under the IPv6 address-family. To deconfigure the virtual link-local IPv6 address forthe HSRP group, use the no form of this command.

address linklocal ipv6-address | autoconfig

no address linklocal ipv6-address | autoconfig

Command Default

None

Command Modes

HSRP Group Submode, under the IPv6 address-family

Usage Guidelines

When you configure HSRP for IPv6, you must also configure the linklocal IPv6 address using either the ipv6-address argument or the autoconfig keyword. If you configure only the global IPv6 address and commit the changes using the commit keyword, the router does not accept the configuration and displays an error message.

Example

This example shows how to autoconfigure the HSRP IPv6 link-local address:

Router# configure Router(config)# router hsrp Router(config-hsrp)# interface tenGigE 0/4/0/4Router(config-hsrp-if)# address-family ipv6Router(config-hsrp-address-family)# hsrp 3 version 2 Router(config-hsrp-virtual-router)# address linklocal autoconfig Router(config-hsrp-virtual-router)#

This example shows how to configure the virtual link-local IPv6 address for the HSRP group:

Router# configure Router(config)# router hsrp Router(config-hsrp)# interface tenGigE 0/4/0/4Router(config-hsrp-if)# address-family ipv6Router(config-hsrp-address-family)# hsrp 3 Router(config-hsrp-virtual-router)# address linklocal FE80::260:3EFF:FE11:6770 Router(config-hsrp-virtual-router)#

Note	The version keyword is available only if IPv4 address-family is selected. By default, version is set to 2 for IPv6 address families. The HSRP version 2 extended group range must be restricted to 0-255, even though the configuration up to 0-4095 is accepted.

Note	Starting with IOS XR Release 7.4.1, the HSRP version 2 extended group range configurable in the router is restricted to 0-255.

To configure the secondary virtual IPv4 address for a virtual router, use the address secondary command in the Hot Standby Router Protocol (HSRP) virtual router submode. To deconfigure the secondary virtual IPv4 address for a virtual router, use the no form of this command.

address address secondary

no address address secondary

Command Default

None

Command Modes

HSRP virtual router

Usage Guidelines

No specific guidelines impact the use of this command.

Example

This example shows how to set the secondary virtual IPv4 address for the virtual router:

Router# configure Router(config)# router hsrp Router(config-hsrp)# interface tenGigE 0/4/0/4Router(config-hsrp-if)# address-family ipv4Router(config-hsrp-ipv4)# hsrp 3 version 2Router(config-hsrp-gp)# address 10.20.30.1 secondaryRouter(config-hsrp-gp)#

Note	The version keyword is available only if IPv4 address-family is selected. By default, version is set to 2 for IPv6 address families. The HSRP version 2 extended group range must be restricted to 0-255, even though the configuration up to 0-4095 is accepted.

Note	Starting with IOS XR Release 7.4.1, the HSRP version 2 extended group range configurable in the router is restricted to 0-255.

To configure an authentication string for the Hot Standby Router Protocol (HSRP), use the hsrp authentication command in HSRP group submode. To delete an authentication string, use the no form of this command.

authentication string

no authentication [string]

Command Default

The default authentication string is cisco.

Command Modes

HSRP Group Submode

Usage Guidelines

The authentication string is sent unencrypted in all HSRP messages. The same authentication string must be configured on all routers and access servers on a LAN to ensure interoperation. Authentication mismatch prevents a device from learning the designated Hot Standby IP address and the Hot Standby timer values from other routers configured with HSRP.

The hsrp authentication command is available for version 1 groups only

This example shows how to configure “company1” as the authentication string required to allow Hot Standby routers in group 1 on tengige hundredgige interface 0/4/0/4 to interoperate:

Router# configure Router(config)# router hsrp Router(config-hsrp)# interface tenGigE 0/4/0/4Router(config-hsrp-if)# address-family ipv4Router(config-hsrp-ipv4)# hsrp 1 version 1 Router(config-hsrp-gp)# authentication company1Router(config-hsrp-gp)#

Note	The version keyword is available only if IPv4 address-family is selected. By default, version is set to 2 for IPv6 address families.

Related Commands

To enable bidirectional forwarding(BFD) fast-detection on a HSRP interface, use the hsrp bfd fast-detect command in HSRP group submode. This creates a BFD session between the HSRP router and its peer, and if the session goes down while HSRP is in backup state, this will initiate a HSRP failover. To disable BFD fast-detection, use the no form of this command.

hsrp group number bfd fast-detect

Command Default

BFD is disabled.

Command Modes

HSRP interface configuration

Usage Guidelines

No specific guidelines impact the use of this command.

This example shows how to enable bfd fast-detect:

RP/0/RP0/CPU0:router# configure RP/0/RP0/CPU0:router(config)# router hsrp RP/0/RP0/CPU0:router(config-hsrp)# interface gig 0/1/1/0RP/0/RP0/CPU0:router(config-hsrp-if)# hsrp 1 bfd fast-detect

To reset the Hot Standby Routing Protocol Statistics (HSRP) statistics to zero, use the clear hsrp statistics command in XR EXEC mode.

clear hsrp statistics [ interface interface-type interface-path-id group ]

Command Default

None

Command Modes

XR EXEC mode

Usage Guidelines

No specific guidelines impact the use of this command.

Example

This sample output is from the clear hsrp statistics command:

Router# clear hsrp statistics

Related Commands

To configure the BFD minimum interval to be used for all VRRP BFD sessions on a given interface, use the bfd minimum-interval command in the interface configuration mode. To remove the configured minimum-interval period and set the minimum-interval period to the default period, use the no form of this command.

hsrp bfd minimum-interval interval

Command Default

Default minimum interval is 50 ms.

Command Modes

HSRP interface configuration

Usage Guidelines

Minimum interval determines the frequency of sending BFD packets to BFD peers. It is the time between successive BFD packets sent for the session. Minimum interval is defined in milliseconds. The configured minimum interval applies to all BFD sessions on the interface.

The following example shows how to configure a minimum interval of 100 milliseconds:

RP/0/RP0/CPU0:router(config)# router hsrpRP/0/RP0/CPU0:router(config-hsrp)# interface gig 0/1/1/0RP/0/RP0/CPU0:router(config-hsrp-if)# hsrp bfd minimum-interval 100

To set the BFD multiplier value, use the bfd multiplier command in the interface configuration mode. To remove the configured multiplier value and set the multiplier to the default value, use the no form of this command.

hsrp bfd multiplier multiplier

Command Default

Default value is 3.

Command Modes

HSRP interface configuration

Usage Guidelines

The multiplier value specifies the number of consecutive BFD packets that, if not received as expected, cause a BFD session to go down. The BFD multiplier applies to all configured BFD sessions on the interface.

The following example shows how to configure a BFD multiplier with multiplier value of 10:

RP/0/RP0/CPU0:router(config)# router hsrpRP/0/RP0/CPU0:router(config-hsrp)# interface gig 0/1/1/0RP/0/RP0/CPU0:router(config-hsrp-if)# hsrp bfd multiplier 10

To configure the activation delay for the Hot Standby Router Protocol (HSRP), use the hsrp delay command in HSRP interface configuration mode. To delete the activation delay, use the no form of this command.

hsrp delay minimum value reload value

no hsrp delay

Command Default

minimum value : 1

reload value : 5

Command Modes

HSRP interface configuration

Usage Guidelines

The hsrp delay command delays the start of the HSRP finite state machine (FSM) on an interface up event to ensure that the interface is ready to pass traffic. This ensures that there are no mistaken state changes due to loss of hello packets. The minimum delay is applied on all interface up events and the reload delay is applied on the first interface event.

The values of zero must be explicitly configured to turn this feature off.

The following example shows how to configure a minimum delay of 10 seconds with a reload delay of 100 seconds:

Router(config)# router hsrpRouter(config-hsrp)# interface tenGigE 0/RP0/CPU0/0Router(config-hsrp-if)# hsrp delay minimum 10 reload 100

Related Commands

To activate the Hot Standby Router Protocol (HSRP), use the hsrp ipv4 command in HSRP interface configuration mode. To disable HSRP, use the no form of this command.

hsrp ipv4 [ ip-address [secondary] ]

no hsrp group-number ipv4 [ ip-address [secondary] ]

Command Default

group-number : 0

HSRP is disabled by default.

Command Modes

HSRP interface configuration

Usage Guidelines

The hsrp ipv4 command activates HSRP on the configured interface. If an IP address is specified, that address is used as the designated address for the Hot Standby group. If no IP address is specified, the virtual address is learned from the active router. For HSRP to elect a designated router, at least one router in the Hot Standby group must have been configured with, or must have learned, the designated address. Configuring the designated address on the active router always overrides a designated address that is currently in use.

When the hsrp ipv4 command is enabled on an interface, the handling of proxy Address Resolution Protocol (ARP) requests is changed (unless proxy ARP was disabled). If the Hot Standby state group has been configured with or has learned the designated address, the proxy ARP requests are answered using the MAC address of the Hot Standby group. Otherwise, proxy ARP responses are suppressed.

Configuring secondary Hot Standby router IP addresses is necessary when the interface has secondary IP addresses configured and redundancy must be provided for the networks of these addresses also.

A primary address must be configured before a secondary address. Likewise, a secondary address must be unconfigured before unconfiguring a primary address. All IP addresses can be unconfigured using the no hsrp ipv4 command.

The following example shows how to activate HSRP for group 1 on tengige interface 0/2/0/1. The IP address used by the Hot Standby group is learned using HSRP.

Router(config)# router hsrpRouterrouter(config-hsrp)# interface tenGigE 0/2/0/1Router(config-hsrp-if)# hsrp 1 ipv4

Related Commands

To configure Internet Control Message Protocol (ICMP) redirect messages to be sent when the Hot Standby Router Protocol (HSRP) is configured on an interface, use the hsrp redirects command in HSRP interface configuration mode. To revert to the default, which is that ICMP messages are enabled, use the no form of this command.

hsrp redirects disable

no hsrp redirects disable

Command Default

HSRP ICMP redirects are enabled by default.

Command Modes

HSRP interface configuration

Usage Guidelines

The hsrp redirects command can be configured on a per-interface basis. When HSRP is first configured on an interface, the setting for that interface inherits the global value. With the hsrp redirects command is enabled, ICMP redirects messages are filtered by replacing the real IP address in the next-hop address of the redirect packet with a virtual IP address if it is known to HSRP.

The following example shows how to allow HSRP to filter redirect messages on tengige interface 0/2/0/1:

Router(config)# router hsrp Router(config-hsrp)# interface tenGigE 0/2/0/1 Router(config-hsrp-if)# hsrp 1 ipv4 192.168.18.1 Router(config-hsrp-if)# hsrp redirects disable

Related Commands

To enable Hot Standby Router Protocol (HSRP) interface configuration command mode, use the interface command in router configuration mode. To terminate interface mode, use the no form of this command.

interface type interface-path-id

no interface type interface-path-id

Command Default

HSRP is disabled.

Command Modes

Router HSRP configuration

Usage Guidelines

All the commands used to configure HSRP are used in HSRP interface configuration mode.

The following example show how to enable HSRP interface configuration mode on tengige 0/2/0/1:

Router(config)# router hsrpRouter(config-hsrp)# interface tenGigE 0/2/0/1Router(config-hsrp-if)#

Related Commands

To configure Hot Standby Router Protocol (HSRP) preemption and preemption delay, use the hsrp preempt command in HSRP interface configuration mode. To restore the default values, use the no form of this command.

hsrp [group-number] preempt [ delay seconds ]

no hsrp [group-number] preempt [ delay seconds ]

Command Default

group-number : 0

seconds : 0 seconds (if the router wants to preempt, it does immediately)

Command Modes

HSRP interface configuration

Usage Guidelines

When the hsrp preempt command is configured, the local router should attempt to assume control as the active router if it has a hot standby priority higher than the current active router. If the hsrp preempt command is not configured, the local router assumes control as the active router only if no other router is currently in the active state.

When a router first comes up, it does not have a complete routing table. If HSRP is configured to preempt, the local HSRP group may become the active router, yet it is unable to provide adequate routing services. This problem can be solved by configuring a delay before the preempting router actually preempts the currently active router.

The preempt delay seconds value does not apply if there is no router currently in the active state. In this case, the local router becomes active after the appropriate timeouts (see the hsrp timers command), regardless of the preempt delay seconds value.

In the following example, the router waits for 300 seconds (5 minutes) after having determined that it should preempt before attempting to preempt the active router. The router might become the active router in a shorter span of time despite the configured delay if no active router is present. Only preempting the active router is delayed.

RP/0/RSP0/CPU0:router# configureRP/0/RSP0/CPU0:router(config)# router hsrpi RP/0/RSP0/CPU0:router(config-hsrp)# interface tenGigE 0/4/0/4RP/0/RSP0/CPU0:router(config-hsrp-if)# address-family ipv4RP/0/RSP0/CPU0:router(config-hsrp-ipv4)# hsrp 1 version 2RP/0/RSP0/CPU0:router(config-hsrp-gp)# preempt delay 300RP/0/RSP0/CPU0:router(config-hsrp-gp)#

Related Commands

To configure Hot Standby Router Protocol (HSRP) priority, use the priority command in HSRP group submode. To restore the default values, use the no form of this command.

priority priority

no priority priority

Command Default

The default priority is 100.

Command Modes

HSRP interface configuration

Usage Guidelines

The assigned priority is used to help select the active and standby routers. Assuming that preemption is enabled, the router with the highest priority becomes the designated active router. In case of ties, the interface IP addresses are compared, and the interface with the higher IP address has priority.

The priority of the device can change dynamically if an interface is configured with the hsrptrack command and another interface on the device goes down.

If preemption is not enabled, the router may not become active even though it might have a higher priority than other HSRP routers.

In this example, the router has a priority of 120:

Router# configure Router(config)# router hsrp Router(config-hsrp)# interface tengige 0/4/0/4Router(config-hsrp-if)# address-family ipv4Router(config-hsrp-ipv4)# hsrp 1 version 2Router(config-hsrp-gp)# priority 120Router(config-hsrp-gp)#

Note	The version keyword is available only if IPv4 address-family is selected. By default, version is set to 2 for IPv6 address families. The HSRP version 2 extended group range must be restricted to 0-255, even though the configuration up to 0-4095 is accepted.

Note	Starting with IOS XR Release 7.4.1, the HSRP version 2 extended group range configurable in the router is restricted to 0-255.

Related Commands

To enable the Hot Standby Router Protocol (HSRP), use the router hsrp command in XR Config mode. To disable HSRP, use the no form of this command.

router hsrp

no router hsrp

Syntax Description

This command has no keywords or arguments.

Command Default

HSRP is disabled.

Command Modes

XR Config mode

Usage Guidelines

HSRP configuration commands must be configured in the HSRP interface configuration mode.

The following example shows how to configure an HSRP redundancy process that contains a virtual router group 1 on tengige 0/2/0/1:

Router(config)# router hsrpRouter(config-hsrp)# interface tenGigE 0/2/0/1Router(config-hsrp-if)# hsrp 1 priority 254

To configure an HSRP session name, use the session name command in the HSRP group submode. To deconfigure an HSRP session name, use the no form of this command.

name name

Command Default

None

Command Modes

HSRP Group Submode

Usage Guidelines

No specific guidelines impact the use of this command.

Example

This example shows how to configure an HSRP session name.

Router# configure Router(config)# router hsrp Router(config-hsrp)# interface tenGigE 0/4/0/4Router(config-hsrp-if)# address-family ipv4Router(config-hsrp-ipv4)# hsrp 1 version 2Router(config-hsrp-gp)# name s1Router(config-hsrp-gp)#

Note	The version keyword is available only if IPv4 address-family is selected. By default, version is set to 2 for IPv6 address families. The HSRP version 2 extended group range must be restricted to 0-255, even though the configuration up to 0-4095 is accepted.

Note	Starting with IOS XR Release 7.4.1, the HSRP version 2 extended group range configurable in the router is restricted to 0-255.

To display Hot Standby Router Protocol (HSRP) information, use the show hsrp command in XR EXEC mode mode.

show hsrp [ interface interface-type interface-path-id ] [ group-number ] [ brief | detail ]

Command Default

By default, a single line of output summarizing each standby group is displayed.

Command Modes

XR EXEC mode

Usage Guidelines

Use the show hsrp command to display HSRP information.

If you want to specify a value for the group-number argument, you must also specify an interface type and number .

This is sample output from the show hsrp detail command:

Router# show hsrp detailtengige 0/4/0/0 - Group 1 Local state is Active, priority 100 Hellotime 3 sec holdtime 10 sec Next hello sent in 0.539 Minimum delay 1 sec, reload delay 5 secBFD enabled: state none, interval 15 ms multiplier 3 Hot standby IP address is 4.0.0.100 configured Active router is local Standby router is unknown expired Standby virtual mac address is 0000.0c07.ac01 2 state changes, last state change 00:05:20

This table describes the significant fields shown in the display.

Related Commands

To display Hot Standby Router Protocol (HSRP) mgo information across all interfaces, use the show hsrp mgo command in XR EXEC mode.

show hsrp mgo [ brief | session-name ]

Command Default

None

Command Modes

XR EXEC mode

Usage Guidelines

No specific guidelines impact the use of this command.

Example

This example shows Hot Standby Router Protocol (HSRP) mgo information for interface HSRP3.

Router# show hsrp mgo HSRP3HSRP3 Primary group Bundle-Ether1.1 IPv4 group 1 State is Active Slave groups: Interface Grp Bundle-Ether1.2 2 Bundle-Ether1.3 3 Bundle-Ether1.4 4 Bundle-Ether1.5 5

This example shows Hot Standby Router Protocol (HSRP) mgo information across all interfaces in a brief format.

Router# show hsrp mgo briefName Interface AF Grp State SlavesHSRP1 Gi0/0/0/1 IPv4 1 Active 100HSRP2 Te0/1/0/0.1 IPv4 2 Standby 50HSRP3 BE1 IPv4 1 Active 4HSRP4 BE1 IPv6 10 Active 11

Related Commands

To display Hot Standby Router Protocol (HSRP) statistics information across all interfaces, use the show hsrp statistics command in XR EXEC mode.

show hsrp [ interface-type interface-path-id | group-number ] statistics

Command Modes

XR EXEC mode

Usage Guidelines

No specific guidelines impact the use of this command.

Example

This sample output is from the show hsrp statistics command:

 Router# show hsrp statisticsProtocol: Transitions to Active 2 Transitions to Standby 2 Transitions to Speak 0 Transitions to Listen 2 Transitions to Learn 0 Transitions to Init 0Packets Sent: 12 Hello: 7 Resign: 0 Coup: 2 Adver: 3 Valid Packets Received: 13 Hello: 8 Resign: 2 Coup: 0 Adver: 3Invalid packets received: 0 Too long: 0 Too short: 0 Mismatching/unsupported versions: 0 Invalid opcode: 0 Unknown group: 0 Inoperational group: 0 Conflicting Source IP: 0 Failed Authentication: 2 Invalid Hello Time: 0 Mismatching Virtual IP: 0

Related Commands

To display Hot Standby Router Protocol (HSRP) summary information across all interfaces, use the show hsrp summary command in XR EXEC mode mode.

show hsrp summary

Syntax Description

This command has no keywords or arguments.

Command Default

None

Command Modes

XR EXEC mode

Usage Guidelines

No specific guidelines impact the use of this command.

Example

This sample output is from the show hsrp summary command:

Router# show hsrp summaryGroups VIPsState Sessions Slaves Total Up Down Total----- --------------------- -----------------ALL 60 900 960 860 2020 2880 ACTIVE 10 190 200 200 300 500STANDBY 15 235 250 250 600 850 SPEAK 10 190 200 200 400 600LISTEN 10 190 200 200 400 600LEARN 5 5 10 10 20 30INIT 10 90 100 0 300 30048 HSRP IPv4 interfaces (43 up, 5 down)5 Tracked IPv4 interfaces (4 up, 1 down)5 BFD sessions (3 up, 2 down)

Related Commands

To instruct the subordinate group to inherit its state from a specified group, use the hsrp slave follow command in HSRP slave submode.

follow mgo-session-name

Command Default

None

Command Modes

HSRP Slave Submode

Usage Guidelines

No specific guidelines impact the use of this command.

Example

Router# configure Router(config)# router hsrp Router(config-hsrp)# interface tenGigE 0/4/0/4Router(config-hsrp-if)# address-family ipv4Router(config-hsrp-ipv4)# hsrp slave Router(config-hsrp-slave)# follow m1

To configure the primary virtual IPv4 address for the subordinate group, use the subordinate primary virtual IPv4 address command in the HSRP slave submode.

address ip-address

Command Default

None

Command Modes

HSRP Slave Submode

Usage Guidelines

No specific guidelines impact the use of this command.

Example

This example shows how to configure the primary virtual IPv4 address for the subordinate group.

Router# configure Router(config)# router hsrp Router(config-hsrp)# interface tenGigE 0/4/0/4Router(config-hsrp-if)# address-family ipv4Router(config-hsrp-ipv4)# hsrp slave Router(config-hsrp-slave)# address 10.2.1.4

Related Commands

To configure the secondary virtual IPv4 address for the subordinate group, use the subordinate secondary virtual IPv4 address command in the HSRP slave submode.

address ip-address secondary

Command Default

None

Command Modes

HSRP Slave Submode

Usage Guidelines

No specific guidelines impact the use of this command.

Example

This example shows how to configure the secondary virtual IPv4 address for the subordinate group.

Router# configure Router(config)# router hsrp Router(config-hsrp)# interface tengige 0/4/0/4Router(config-hsrp-if)# address-family ipv4Router(config-hsrp-ipv4)# hsrp slave Router(config-hsrp-slave)# address 10.2.1.4 secondary

Related Commands

To configure the time between hello packets and the time before other routers declare the active Hot Standby or standby router to be down, use the hsrp timers command in HSRP group submode. To restore the timers to their default values, use the no form of this command.

timers { hello-seconds | msec hello-milliseconds } { hold-seconds | msec hold-milliseconds }

no timers

Command Default

The default hello-seconds is 3. (If the msec keyword is specified, there is no default value.)

The default hold-seconds is 10. (If the msec keyword is specified, there is no default value.)

Command Modes

HSRP Group Submode

Usage Guidelines

Nonactive routers learn timer values from the active router, unless millisecond timer values are being used. If millisecond timer values are being used, all routers must be configured with the millisecond timer values. This rule applies if either the hello time or the hold time is specified in milliseconds.

The timers configured on the active router always override any other timer settings. All routers in a Hot Standby group should use the same timer values. Normally, the hold time is greater than or equal to three times the hello time (holdtime > 3 * hellotime).

You must specify either the hello-seconds argument or the msec keyword and hello-milliseconds argument, depending on whether you want the hello time in seconds or milliseconds. You must also specify either the hold-seconds argument or msec keyword and hold-milliseconds argument, depending on whether you want the hold time in seconds or milliseconds.

This example shows how to set, for group number 1 on Ten Gigabit Ethernet interface 0/2/0/1, the time between hello packets to 5 seconds and the time after which a router is considered to be down to 15seconds. The configured timer values are used only if the router is active (or before they have been learned).

Router# configure Router(config)# router hsrp Router(config-hsrp)# interface tengige 0/4/0/4Router(config-hsrp-if)# address-family ipv4Router(config-hsrp-ipv4)# hsrp 1Router(config-hsrp-gp)# timers 5 15Router(config-hsrp-gp)#

This example shows how to set, for group number 1 on Ten Gigabit Ethernet interface 0/2/0/1, the time between hello packets to 200 milliseconds and the time after which a router is considered to be down to 1000milliseconds. The configured timer values are always used because milliseconds have been specified.

Router# configure Router(config)# router hsrp Router(config-hsrp)# interface tenGigE 0/4/0/4Router(config-hsrp-if)# address-family ipv4Router(config-hsrp-ipv4)# hsrp 1 version 2Router(config-hsrp-gp)# timers msec 200 msec 1000Router(config-hsrp-gp)#

Note	The version keyword is available only if IPv4 address-family is selected. By default, version is set to 2 for IPv6 address families. The HSRP version 2 extended group range must be restricted to 0-255, even though the configuration up to 0-4095 is accepted.

Note	Starting with IOS XR Release 7.4.1, the HSRP version 2 extended group range configurable in the router is restricted to 0-255.

Related Commands

To configure an interface so that the Hot Standby priority changes on the basis of the availability of other interfaces, use the hsrp track command in HSRP group submode. To remove the tracking, use the no form of this command.

track type interface-path-id [priority-decrement]

no track type interface-path-id [priority-decrement]

Command Default

The default priority-decrement is 10.

Command Modes

HSRP Group Submode

Usage Guidelines

The hsrp track command ties the Hot Standby priority of the router to the availability of its interfaces. It is useful for tracking interfaces that are not configured for the Hot Standby Router Protocol (HSRP). Only IP interfaces are tracked. A tracked interface is up if IP on that interface is up. Otherwise, the tracked interface is down.

When a tracked interface goes down, the Hot Standby priority decreases by 10. If an interface is not tracked, its state changes do not affect the Hot Standby priority. For each group configured for Hot Standby, you can configure a separate list of interfaces to be tracked.

The optional priority-decrement argument specifies by how much to decrement the Hot Standby priority when a tracked interface goes down. When the tracked interface comes back up, the priority is incremented by the same amount.

When multiple tracked interfaces are down and priority-decrement values have been configured, these configured priority decrements are cumulative. If tracked interfaces are down, but none of them were configured with priority decrements, the default decrement is 10 and it is cumulative.

The hsrp preempt command must be used in conjunction with this command on all routers in the group whenever the best available router should be used to forward packets. If the hsrp preempt command is not used, then the active router stays active, regardless of the current priorities of the other HSRP routers.

This example shows how to configure an interface so that the Hot Standby priority changes on the basis of the availability of other interfaces.

Router# configure Router(config)# router hsrp Router(config-hsrp)# interface tenGigE 0/4/0/4Router(config-hsrp-if)# address-family ipv4Router(config-hsrp-ipv4)# hsrp 1 version 2Router(config-hsrp-gp)# track tenGigE 0/4/0/4 2 Router(config-hsrp-gp)#

Note	The version keyword is available only if IPv4 address-family is selected. By default, version is set to 2 for IPv6 address families. The HSRP version 2 extended group range must be restricted to 0-255, even though the configuration up to 0-4095 is accepted.

Note	Starting with IOS XR Release 7.4.1, the HSRP version 2 extended group range configurable in the router is restricted to 0-255.

Related Commands

To enable tracking of a named object with the specified decrement, use the track (object) command in HSRP group submode. To remove the tracking, use the no form of this command.

track object name [priority-decrement]

no track object name [priority-decrement]

Command Default

The default priority-decrement is 10.

Command Modes

HSRP Group Submode

Usage Guidelines

No specific guidelines impact the use of this command.

This example shows how to configure object tracking under the HSRP group submode.

Router# configure Router(config)# router hsrp Router(config-hsrp)# interface tenGigE 0/4/0/4Router(config-hsrp-if)# address-family ipv4Router(config-hsrp-ipv4)# hsrp 1 version 2Router(config-hsrp-gp)# track object t1 2Router(config-hsrp-gp)#

Note	The version keyword is available only if IPv4 address-family is selected. By default, version is set to 2 for IPv6 address families. The HSRP version 2 extended group range must be restricted to 0-255, even though the configuration up to 0-4095 is accepted.

Note	Starting with IOS XR Release 7.4.1, the HSRP version 2 extended group range configurable in the router is restricted to 0-255.

Related Commands