May 2009
Intermediate to advanced
882 pages
22h 55m
English
Content preview from Cisco® Network Professional's: Advanced Internetworking Guide
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10.5. Gateway Load Balancing Protocol
Although HSRP and VRRP provide gateway resiliency, the upstream bandwidth of the standby members of the redundancy group is not used while the devices are in standby mode. Only the active routers in HSRP and VRRP groups forward traffic for the virtual MAC. Resources associated with the standby router are not fully utilized. Some load balancing can be accomplished with these protocols through the creation of multiple groups and through the assignment of multiple default gateways, but these configurations create an administrative burden.
Cisco designed a proprietary load-balancing protocol, Gateway Load Balancing Protocol (GLBP), to allow automatic selection and simultaneous use of multiple available gateways ...
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