Implementing High Availability in a Campus
EnvironmentConfiguring Layer 3 Redundancy with VRRP and GLBP
VRRP
VRRP Operational Process
Configuring VRRP on an InterfaceEnable VRRP on an interface and
display the configuration.
Gateway Load Balancing ProtocolSingle virtual IP address and
multiple virtual MAC addressesTraffic to single gateway distributed
across routersAutomatic rerouting in the event of any failure Full
use of resources on all routers without the administrative burden
of creating multiple groups
GLBP OperationsGLBP group members elect one AVG.AVG assigns a
virtual MAC address to each member of the group.AVG replies to the
ARP requests from clients with different virtual MAC addresses,
thus achieving load balancing.Each router becomes an AVF for frames
that are addressed to that virtual MAC address.
GLBP Operation
GLBP Operation (Cont.)
GLBP Interface Tracking
GLBP Interface Tracking (Cont.)
Configuring GLBP on an InterfaceEnable GLBP on an interface and
display the configuration.
SummaryVRRP provides router redundancy in a manner similar to
HSRP.VRRP supports a master and one or more backup routers.VRRP and
GLBP are configured per interface.GLBP provides router redundancy
and load balancing.GLBP balances traffic by allocating a virtual
MAC address to each AVF.
