The Gateway Load Balancing Protocol (GLBP) is an advanced Cisco proprietary protocol that aims to enhance the capabilities of gateway protocols by providing automatic backup and load balancing of multiple gateways in a network. Unlike other gateway redundancy protocols that allow for a single active gateway at a time, GLBP enables the use of multiple gateways simultaneously, distributing client traffic among them in a network. This innovative approach not only increases the network resource utilization but also ensures higher availability and reliability by avoiding a single point of failure.
GLBP functions by electing one gateway as the Active Virtual Gateway (AVG) and one or more gateways as Active Virtual Forwarders (AVFs). The AVG is responsible for managing the IP addresses assigned to the GLBP group and responds to Address Resolution Protocol (ARP) requests for these IP addresses. Instead of providing the MAC address of a single gateway, the AVG replies with the MAC address of one of the AVFs, thereby distributing the load among them based on a pre-configured algorithm. This process is seamless to the end users, providing both load balancing and redundancy.
GLBP offers a multitude of features that make it a preferable choice in complex network environments:
The operation of GLBP can be divided into several key processes:
To implement GLBP in a network, network administrators must ensure that all participating gateways are Cisco devices that support the protocol. Configuration involves defining a GLBP group, setting priorities for the gateways, and configuring the load balancing method. It’s important to plan the GLBP setup carefully, considering factors such as network topology, traffic patterns, and redundancy requirements to achieve optimal performance and reliability.
GLBP’s primary advantage lies in its ability to provide both load balancing and redundancy, allowing multiple gateways to be used simultaneously for outbound traffic, which enhances network utilization and reliability.
GLBP achieves load balancing by electing one gateway as the Active Virtual Gateway (AVG), which then responds to ARP requests with the MAC addresses of different Active Virtual Forwarders (AVFs), distributing the load among them according to a configured algorithm.
No, GLBP is a Cisco proprietary protocol and requires Cisco devices for implementation. For non-Cisco environments, other redundancy protocols may be considered.
GLBP supports several load balancing methods, including round-robin, weighted, and host-dependent, giving network administrators flexibility in how traffic is distributed among gateways.
GLBP monitors the status of all AVFs. If an AVF fails, the AVG automatically redistributes the failed AVF’s traffic among the remaining operational AVFs, ensuring the network remains accessible.
Start for only $1. Unlock endless learning opportunities with over 2,600 hours of IT training at our lowest price ever. Plus, get all new and updated online courses for free while your subscription remains active.
Cancel at your convenience. This exceptional deal on IT training provides you access to high-quality IT education at the lowest monthly subscription rate in the market. Boost your IT skills and join our journey towards a smarter tomorrow.
ENDING THIS WEEKEND: Train for LIFE at our lowest price. Buy once and never have to pay for IT Training Again.
