The problem of unequal-cost load-balancing Have you ever wondered why among all IGPs only EIGRP supports unequal-cost load balancing (UCLB)? Is there any special reason why only EIGRP supports this feature? Apparently, there is. Let’s start with the basic idea of equal-cost load-balancing (ECLB). This one is simple: if there are multiple paths to the same destination with equal costs, it is reasonable to use them all and share traffic equally among the paths. Alternate paths are guaranteed to... Read More
GLBP, an acronym for Gateway Load Balancing Protocol, is a virtual gateway protocol similar to HSRP and VRRP. However, unlike its little brothers, GLBP is capable of using multiple physical gateways at the same time. As we know, a single HSRP or VRRP group represents one virtual gateway, with single virtual IP and MAC addresses. Only one physical gateway in a standby/redundancy group is responsible for packet forwarding, others remain inactive in standby/backup state. If you have R1, R2, R3... Read More

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