nx.os.and.cisco.nexus.switching.2nd.edition.1587143046

GLBP
Figure 3-14. IGP Routing with vPC
Gateway Load Balancing Protocol (GLBP) is a Cisco innovation that, although similar to
HSRP and VRRP, provides basic load-balancing capabilities. GLBP enables two or more
routers to provide first-hop redundancy services for IP traffic. In GLBP, a virtual IP address
is configured and is “owned” by one of the routers participating in the GLBP group to
represent the default gateway for a given subnet. The owning router or active virtual
gateway (AVG) in a GLBP environment responds to the sender with a unique MAC address
to enable the distribution of traffic.
GLBP uses different load-balancing mechanisms to determine the distribution of traffic
between the routers participating in the GLBP group.
At the time of this writing, GLBP is supported on the Nexus 7000 series switches.
GLBP Configuration
The first step to configure GLBP is to enable it in global configuration mode using the
feature command, as demonstrated in Example 3-119. With the modular nature of NX-OS,
using the feature command loads the GLBP modular code into memory for execution.
Without the feature enabled, it would not be resident in memory.