The Generic Attribute Registration Protocol (GARP) is a Cisco ACI protocol that allows devices to register themselves and their attributes with the ACI controller. This allows the controller to keep track of devices and their attributes, and to enforce policies based on those attributes.
GARP is used to register attributes of devices with the ACI controller. These attributes can be used to identify devices, and to enforce policies. Attributes are registered in the form of (type, length, value) triplets.
The most common attributes that are registered are:
• MAC address • IP address • VLAN ID • Port number
GARP is also used to keep track of the location of devices. This is done by sending GARP Location Updates (GLUPs). GLUPs are sent when a device moves to a new location, and they contain the new location information.
The GARP protocol is simple, but it is very important for the operation of ACI.
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