Glbp Ip; Command Reference, Cisco Ios Xe Everest 16.5.1A (Catalyst 3650 Switches - Cisco Catalyst 3650 series Command Reference Manual

glbp ip

glbp ip
To activate the Gateway Load Balancing Protocol (GLBP), use the glbp ip command in interface configuration
mode. To disable GLBP, use the no form of this command.
glbp group ip [ip-address [secondary]]
no glbp group ip [ip-address [secondary]]
Syntax Description
group
ip-address
secondary
Command Default
GLBP is disabled by default.
Command Modes
Interface configuration (config-if)
Command History
Release
Cisco IOS XE Release 2.1
Usage Guidelines
The glbp ip command activates GLBP on the configured interface. If an IP address is specified, that address
is used as the designated virtual IP address for the GLBP group. If no IP address is specified, the designated
address is learned from another device configured to be in the same GLBP group. For GLBP to elect an active
virtual gateway (AVG), at least one device on the cable must have been configured with the designated address.
A device must be configured with, or have learned, the virtual IP address of the GLBP group before assuming
the role of a GLBP gateway or forwarder. Configuring the designated address on the AVG always overrides
a designated address that is in use.
When the glbp ip command is enabled on an interface, the handling of proxy Address Resolution Protocol
(ARP) requests is changed (unless proxy ARP was disabled). ARP requests are sent by hosts to map an IP
address to a MAC address. The GLBP gateway intercepts the ARP requests and replies to the ARP on behalf
of the connected nodes. If a forwarder in the GLBP group is active, proxy ARP requests are answered using
the MAC address of the first active forwarder in the group. If no forwarder is active, proxy ARP responses
are suppressed.

Command Reference, Cisco IOS XE Everest 16.5.1a (Catalyst 3650 Switches)

152
GLBP group number in the range from 0 to 1023.
(Optional) Virtual IP address for the GLBP group.
The IP address must be in the same subnet as the
interface IP address.
(Optional) Indicates that the IP address is a secondary
GLBP virtual address.
Modification
This command was introduced.