Dell PowerConnect 7048P User Manual - Page 1021

Configuring VRRP 36 This chapter describes how to configure Virtual Routing Redundancy Protocol (VRRP) on the switch. VRRP can help create redundancy on networks in which end-stations are statically configured with the default gateway IP address. The topics covered in this chapter include: • VRRP Overview • Default VRRP Values • Configuring VRRP Features (Web) • Configuring VRRP Features (CLI) • VRRP Configuration Example VRRP Overview The Virtual Router Redundancy (VRRP) protocol is designed to handle default router (L3 switch) failures by providing a scheme to dynamically elect a backup router. VRRP can help minimize black hole periods due to the failure of the default gateway router during which all traffic directed towards it is lost until the failure is detected. How Does VRRP Work? VRRP eliminates the single point of failure associated with static default routes by enabling a backup router to take over from a master router without affecting the end stations using the route. The end stations will use a virtual IP address that will be recognized by the backup router if the master router fails. Participating routers use an election protocol to determine which router is the master router at any given time. A given port may appear as more than one virtual router to the network, also, more than one port on a switch may be configured as a virtual router. Either a physical port or a routed VLAN may participate. Configuring VRRP 1021