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Table Of Contents
V Commands
This chapter describes the Cisco NX-OS unicast routing commands that begin with the letter V.
vrf
To create a VPN routing and forwarding instance (VRF) or enter the VRF configuration mode and configure submode commands for the Intermediate System-to-Intermediate System Intradomain Routing Protocol (IS-IS), use the vrf command. To remove a VRF instance or disable the VRF configuration mode, use the no form of this command.
vrf name | management
no vrf name | management
Syntax Description
Command Default
None
Command Modes
Address-family configuration
Router configuration
VRF configurationSupported User Rolesnetwork-admin
vdc-adminCommand History
Usage Guidelines
Each VRF mode serves as a separate instance within the IS-IS process. All configuration commands available in the global configuration mode are available in the new VRF mode. For example, each VRF mode must has its own NET configured for that particular instance to be operational. All EXEC commands can be specified to be per-VRF, else with no arguments, it will be applied to the default VRF. Note that interfaces belong to a particular VRF and the appropriate interface will only be applied to the particular interface with the ip/ipv6 router isis command.
The VRF does not become active until you create an identically named VRF in global configuration mode.
When you enter the VRF configuration mode, the following commands are available:
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address-family—Configures an address family. See the address-family (BGP) command for additional information.
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Examples
The following command shows how to enter VRf configuration mode:
switch(config)# router isis 100switch(config-router)# vrf managementswitch(config-router-vrf)#Related Commands
address-family
Enters the address family mode or a VRF address-family mode.
feature isis
Enables IS-IS on the router.
router isis
Enables IS-IS.
vrf context
To create a virtual routing and forwarding instance (VRF) and enter VRF configuration mode, use the vrf router BGP configuration command. To remove a VRF entry, use the no form of this command.
vrf context {name | management}
no vrf context {name | management}
Syntax Description
name
Name of the VRF. The name can be any case-sensitive, alphanumeric string up to 32 characters.
management
Specifies a configurable VRF name.
Command Default
This command has no default settings.
Command Modes
Neighbor address-family configuration
Router bgp configurationSupported User Rolesnetwork-admin
vdc-adminCommand History
Usage Guidelines
The VRF does not become active until you create an identically named VRF in global configuration mode.
When you enter the VRF configuration mode, the following commands are available:
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The cluster-id command is used to assign a cluster ID to a route reflector when the cluster has one or more route reflectors. Multiple route reflectors are deployed in a cluster to increase redundancy and avoid a single point of failure. When multiple route reflectors are configured in a cluster, the same cluster ID is assigned to all route reflectors. This allows all route reflectors in the cluster to recognize updates from peers in the same cluster and reduces the number of updates that need to be stored in BGP routing tables.
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Using the log-neighbor-changes command to enable status change message logging does not cause a substantial performance impact, unlike, for example, enabling per BGP update debugging. If the UNIX syslog facility is enabled, messages are sent to the UNIX host running the syslog daemon so that the messages can be stored and archived. If the UNIX syslog facility is not enabled, the status change messages are retained in the internal buffer of the router, and are not stored to disk. You can set the size of this buffer, which is dependent upon the available RAM, using the logging buffered command.
The neighbor status change messages are not tracked if the bgp log-neighbor-changes command is disabled, except for the reset reason, which is always available as output of the show ip bgp neighbors and show bgp ipv6 neighbors commands.
The eigrp log-neighbor-changes command enables logging of Enhanced Interior Gateway Routing Protocol (EIGRP) neighbor adjacencies, but messages for BGP neighbors are logged only if they are specifically enabled with the bgp log-neighbor-changes command.
Use the show logging command to display the log for the BGP neighbor changes.
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Examples
The following command shows how to enter VRf configuration mode:
switch(config)# router bgp 64496switch(config-router)# vrf context managementswitch(config-router-vrf)#The following example shows how to set the local router as one of the route reflectors serving the cluster. You configure the cluster ID to identify the cluster.
switch(config)# router bgp 64496switch(config-router)# neighbor 192.168.70.24 route-reflector-clientswitch(config-router)# cluster-id 10.0.1.2vrf member
To configure object tracking on a virtual routing and forwarding (VRF) instance, use the vrf member command. To remove the object tracking for this route, use the no form of this command.
vrf member vrf-name
no vrf member vrf-name
Syntax Description
Command Default
None
Command Modes
Global configuration
Supported User Rolesnetwork-admin
vdc-adminCommand History
Usage Guidelines
Use the vrf member command in object tracking configuration mode to track objects in a nondefault VRF.
This command does not require a license.
Examples
This example shows how to track an IP route in vrf Red:
switch(config)# track 1 ip route 10.10.10.0/8 reachabilityswitch(config-track)# vrf member RedRelated Commands
show track
Displays information about object tracking.
track ip route
Tracks an interface.
vrrp
To create a Virtual Router Redundancy Protocol (VRRP) group on a particular Ethernet interface and assign a number to the VRRP group and enter VRRP configuration mode, use the vrrp command. To remove a VRRP group, use the no form of this command.
vrrp number
no vrrp number
Syntax Description
number
The VRRP group number, which you can configure for a Gigabit Ethernet port, including the main interfaces and subinterfaces. The range is from 1 to 255.
Defaults
None
Command Modes
VRRP configuration mode
Supported User Rolesnetwork-admin
VDC administratorCommand History
Usage Guidelines
You can configure VRRP only if its state is disabled. Make sure that you configure at least one IP address before you attempt to enable a virtual router.
This command does not require a license.
Examples
This example shows how to create a VRRP group:
switch(config-if-vrrp)# vrrp 7This example shows how to create a VRRP group and configure an IPv4 address for the group:
switch# config terminalswitch(config)# interface ethernet 2/1switch(config-if)# vrrp 7switch(config-if-vrrp)# address 10.0.0.10switch(config-if-vrrp)# no shutdownRelated Commands
feature vrrp
Enables VRRP.
show vrrp
Displays VRRP configuration information.
clear vrrp
Clears all the software counters for the specified virtual router.
