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This chapter describes the Cisco NX-OS unicast routing commands that begin with the letter V.
To specify the delay period for the initialization of First Hop Redundancy Protocol (FHRP) clients, use the vfhrp delay command.
vfhrp delay {[minimum] [reload] seconds }
(Optional) Configures the delay period after an interface becomes available. |
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(Optional) Configures the delay period after the device reloads. |
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This example shows how to specify the delay period for the initialization of FHRP clients:
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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.
Address-family configuration
Router configuration
VRF configuration
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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:
The following command shows how to enter VRF configuration mode:
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Enters the address family mode or a VRF address-family mode. |
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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 }
Name of the VRF. The name can be any case-sensitive, alphanumeric string up to 32 characters. |
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Neighbor address-family configuration
Router bgp configuration
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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:
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.
Note All route reflectors must maintain stable sessions between all peers in the cluster. If stable sessions cannot be maintained, then overlay route reflector clusters should be used instead (route reflectors with different cluster IDs).
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.
The following command shows how to enter VRF configuration mode:
This 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.
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 name. The name can be any case-sensitive, alphanumeric string up to 64 characters. |
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Use the vrf member command in object tracking configuration mode to track objects in a nondefault VRF.
This example shows how to track an IP route in vrf Red:
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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.
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. |
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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 example shows how to create a VRRP group:
This example shows how to create a VRRP group and configure an IPv4 address for the group:
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Clears all the software counters for the specified virtual router. |
To create a Virtual Router Redundancy Protocol version 3 (VRRPv3) group and enter VRRPv3 group configuration mode, use the vrrpv3 address-family command.
vrrpv3 number address-family {ipv4 | ipv6}
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This example shows how to create a VRRPv3 group and enter VRRPv3 group configuration mode:
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To specify a leader’s name to be registered with Virtual Router Redundancy Service (VRRS), use the vrrs leader command.
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This example shows how to specify a leader’s name to be registered with VRRS:
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Creates a VRRPv3 group and enter VRRPv3 group configuration mode. |
To define the Virtual Router Redundancy Service (VRRS) pathway for a VRRS group and enter VRRS pathway configuration mode, use the vrrs pathway command.
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This example shows how to define the VRRS pathway for a VRRS group and enter VRRS pathway configuration mode:
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Displays the VRRS pathway information for different pathway states. |
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