Brocade Mobility RFS Controller System Reference Guide (Supporting software release 5.5.0.0 and later) - Manual (Page 220)

208 Brocade Mobility RFS Controller System Reference Guide
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FIGURE 101 Security Source Dynamic NAT screen
11. Select OK to save the changes made within the Add Row and Source Dynamic NAT screen.
Select Reset to revert to the last saved configuration.
Overriding a Profile’s 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, 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.
The election of a VRRP master is central to the configuration of VRRP. 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.
Nodes losing the election process enter a backup state where they monitor the master for any
failures, and in case of a failure, one of the backups become 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.