Motorola WiNG 5.7.1, Справочное руководство системы

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5 - 348 WiNG 5.7.1 Access Point System Reference Guide
5.4.5.6 Overriding the Virtual Router Redundancy Protocol (VRRP) Configuration
Overriding a Device Configuration
A default gateway is a critical resource for connectivity. However, it’s prone to a single point of failure. Thus, redundancy for
the default gateway is required by the access point. If WAN backhaul is available on an AP7131, and a router failure occurs,
then the access point should act as a router and forward traffic on to its WAN link.
Define an external Virtual Router Redundancy Protocol (VRRP) configuration when router redundancy is required in a wireless
network requiring high availability.
Central to the configuration of VRRP is the election of a VRRP master. A VRRP master (once elected) performs the following
functions:
• Responds to ARP requests
• Forwards packets with a destination link layer MAC address equal to the virtual router MAC address
• Rejects packets addressed to the IP address associated with the virtual router, if it is not the IP address owner
• Accepts packets addressed to the IP address associated with the virtual router, if it is the IP address owner or accept
mode is true
Those nodes that lose the election process enter a backup state. In the backup state they monitor the master for any failures,
and in case of a failure one of the backups, in turn, becomes the master and assumes the management of the designated virtual
IPs. A backup does not respond to an ARP request, and discards packets destined for a virtual IP resource.
To define the configuration of a VRRP group:
1. Select the Configuration tab from the Web UI.
2. Select Device Overrides from the Device menu to expand it into sub menu options.
3. Select a target device from the device browser in the lower, left-hand, side of the UI.
4. Select VRRP .
NOTE: VRRP support is available only on AP7131 model access point, and is not
available on other models.