Table Of Contents
hello-interval (OSPF virtual link)
hello-interval (OSPFv3 virtual link)
H Commands
This chapter describes the Cisco NX-OS unicast routing commands that begin with the letter H.
hello-interval (OSPF virtual link)
To specify the interval between hello packets that Cisco NX-OS sends on an Open Shortest Path First (OSPF) virtual link, use the hello-interval command. To return to the default, use the no form of this command.
hello-interval seconds
no hello-interval
Syntax Description
seconds
The hello interval (in seconds). The value must be the same for all nodes on a specific virtual link. The range is from 1 to 65535.
Defaults
10 second.
Command Modes
Virtual link configuration
Supported User Rolesnetwork-admin
vdc-adminCommand History
Usage Guidelines
Use the hello-interval command in virtual link configuration mode to set the hello interval for OSPF across a virtual link. A shorter hello interval detects topological changes faster but causes more routing traffic. The hello interval must be the same for all devices on a virtual link.
This command requires the Enterprise Services license.
Examples
The following example shows how to configure the hello interval to 15 seconds:
switch(config)# router ospf 202switch(config-router)# ip ospf area 99 virtual-link 192.0.2.4switch(config-router-vlink)# hello-interval 15Related Commands
dead-interval (virtual link)
Sets the time period to declare a neighbor as down if the local device receives no hello packets.
hello-interval (OSPFv3 virtual link)
To specify the interval between hello packets that Cisco NX-OS sends on an Open Shortest Path First version 3 (OSPFv3) virtual link, use the hello-interval command. To return to the default, use the no form of this command.
hello-interval seconds
no hello-interval
Syntax Description
seconds
The hello interval (in seconds). The value must be the same for all nodes on a specific virtual link. The range is from 1 to 65535.
Defaults
10 second.
Command Modes
Virtual link configuration
Supported User Rolesnetwork-admin
vdc-adminCommand History
Usage Guidelines
Use the hello-interval command in virtual link configuration mode to set the hello interval for OSPFv3 across a virtual link. A shorter hello interval detects topological changes faster but causes more routing traffic. The hello interval must be the same for all devices on a virtual link.
This command requires the Enterprise Services license.
Examples
This example shows how to configure the hello interval to 15 seconds:
switch(config)# router ospfv3 202switch(config-router)# ipv6 ospfv3 area 99 virtual-link 192.0.2.4switch(config-router-vlink)# hello-interval 15Related Commands
dead-interval (OSPFv3 virtual link)
Sets the time period to declare a neighbor as down if the local device receives no hello packets.
hostname dynamic
To enable the exchange of the dynamic host name for IS-IS, use the hostname dynamic configuration mode command. To disable the exchange of the dynamic host name for IS-IS, use the no form of this command
hostname name
no hostname name
Syntax Description
This command has no arguments or keywords.
Command Default
Dynamic host name is disabled by default.
Command Modes
Router configuration
VRF configurationSupported User Rolesnetwork-admin
vdc-adminCommand History
Usage Guidelines
The hostname dynamic command allows you to enable the IS-IS routers to flood their host name to system ID mapping information across the IS-IS network.
This command requires the Enterprise Services license.
Examples
The following example shows how to enable the exchange of the dynamic host name for IS-IS:
switch(config-router)# hostname dynamicswitch(config-router)#The following example shows how to disable the exchange of the dynamic host name for IS-IS:
switch(config-router)# no hostname dynamicswitch(config-router)#Related Commands
hsrp
To enter Hot Standby Router Protocol (HSRP) configuration mode and create an HSRP group, use the hsrp command. To disable HSRP, use the no form of this command.
hsrp group-number
no hsrp group-number
Syntax Description
group-number
The number of HSRP groups that can be configured on a Gigabit Ethernet port, including the main interfaces and subinterfaces. The range is from 1 to 255. The default value is 0.
Defaults
Disabled
Command Modes
Interface configuration
Supported User RolesSuperuser
VDC administratorCommand History
Usage Guidelines
You must globally enable HSRP before you can configure any HSRP options or create an HSRP group.
This command does not require a license.
Examples
This example shows how to create and activate an HSRP group:
switch# configure tswitch(config)# interface ethernet 0switch(config-if)# ip address 172.16.6.5 255.255.255.0switch(config-if)# hsrp 1switch(config-if-hsrp)#Related Commands