Brocade Mobility RFS Controller System Reference Guide (Supporting software release 5.5.0.0 and later) - Manual (Page 518)

506 Brocade Mobility RFS Controller System Reference Guide
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• Brocade RFS4000 and RFS6000 model wireless controllers can provide outbound NAT
services for hosts connected to multiple VLANs. For small deployments, VLANs should be
terminated within a RFS4000 wireless controller providing site routing services. For
medium-scale deployments, VLANs are typically terminated on a L3 (IP layer) or L2
(Ethernet layer).
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. 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 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 VVRP group:
1. Select Configuration > Profiles.
2. Select VRRP.