Brocade Mobility Access Point System Reference Guide (Supporting software release 5.5.0.0 and later) User Manual
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Brocade Mobility Access Point System Reference Guide
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FIGURE 195
Profile Security - Source Dynamic NAT screen - Add Row field
10. Select OK to save the changes made within the Add Row and Dynamic NAT screens. Select
Reset to revert to the last saved configuration.
Overriding the Virtual Router Redundancy Protocol (VRRP) 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 Brocade Mobility 7131 Access Point, 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.