Configure VRRP for an Interface

Configure VRRP to provide fast failover of a default router for IPv6 LAN hosts. VRRP supports a virtual IPv6 address shared between two or more routers that connect the common subnet to the enterprise network. VRRP for IPv6 provides a faster switchover to an alternate default router than is possible using the ND protocol.

Perform this procedure to configure VRRP on either a brouter port or a VLAN.

Before you begin

  • Assign an IPv6 address to the interface.

  • Enable routing globally.

  • Do not configure RSMLT on the VLAN.

  • Change the VRF instance as required to configure a VRRP for an interface on a specific VRF instance. Not all parameters are configurable on non-default VRFs.

Procedure

  1. In the navigation pane, expand the following folders: Configuration > IPv6.
  2. Select VRRP.
  3. Select V3 Interface.
  4. Select Insert.
  5. Beside the IfIndex field, click Port or VLAN.
  6. In the dialog box that opens, select a port or VLAN.
  7. Select OK.
  8. Type the virtual router ID.
  9. To control the packets sent to the IPv6 address associated to the virtual router, select the AcceptMode check box.
  10. Type the primary IP address.
  11. Select Insert.

V3 Interface or Interface Field Descriptions

Use the data in the following table to use the V3 Interface tab.

Name

Description

IfIndex

Shows the index value that uniquely identifies the interface to which this entry applies.

InetAddrType

Specifies the address type for the VRRP interface.

VrId

Specifies a number that uniquely identifies a virtual router on a VRRP router.

PrimaryIpAddr

Specifies the link-local address assigned to the VRRP.

VirtualMacAddr

Specifies the MAC address of the virtual router interface.

State

Shows the state of the virtual router interface. The possible states are

  • initialize—waiting for a startup event

  • backup—monitoring availability and state of the master router

  • master—functioning as the forwarding router for the virtual router IP addresses

Control

Displays whether VRRP is enabled or disabled for the port or VLAN.

Priority

Specifies the priority value used by this VRRP router. The value 255 is reserved for the router that owns the IP addresses associated with the virtual router. The default is 100.

AdvInterval

Specifies the time interval, in seconds, between sending advertisement messages. The default is 1 second.

MasterIpAddr

Specifies the IP address of the physical interface of the Master's virtual router.

UpTime

Indicates the time interval since this virtual router exited the INIT state.

CriticalIpAddr

Indicates the IP address of the interface that is critical to VRRP. If that IP interface is down, the VRRP state will transition to Backup, even if it has higher priority.

CriticalIpAddrEnabled

Enables or disables the use of critical IP. When disabled, the VRRP ignores the availability of the address configured as critical IP. This address must be a local address. The default is disabled.

BackUpMaster

Uses the backup VRRP switch for traffic forwarding. This option reduces the traffic on the vIST. The default is disabled.

BackUpMasterState

Indicates if the Backup-Master is up. If the switch is in Master state, but Backup-Master is enabled, then the BACKUP MASTER STATE will be down.

FasterAdvIntervalEnabled

Enables or disables the fast advertisement interval. When disabled, the regular advertisement interval is used. The default is disable.

FasterAdvInterval

Configures the interval between VRRP advertisement messages. The default is 200.

Enter the values in multiples of 200 milliseconds.

AcceptMode

Controls whether the VRRP master or backup master accepts packets (other than neighbor discovery packets) destined to the IPv6 address associated with the virtual router. The default value is disable.

PreemptMode

Issued to preempt the existing router. If a new router is added to the network with its priority higher than the existing routers, then the new router becomes the master. The default is enabled.

Action

Lists options to override the hold-down timer manually and force preemption:

  • none does not override the timer.

  • preemptHoldDownTimer preempts the timer.

This parameter applies only if the holddown timer is active.

HoldDownTimer

Configures the amount of time, in seconds, to wait before preempting the current VRRP master. The default is 0.

HoldDownTimeRemaining

Indicates the amount of time, in seconds, left before the HoldDownTimer expires.

MasterAdvInterval

On the VRRP master, the master advertisement interval is same as the advertisement interval. On the VRRPv3 Backup, the master advertisement interval is set to the Advertisement configured on the Master (received in the packet).
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