Chapter 2 Gmrp Configuration; Gmrp Overview; Configuring Gmrp; Enabling Gmrp Globally - H3C S7500 Series Operation Manual

Operation Manual – Multicast
H3C S7500 Series Ethernet Switches

Chapter 2 GMRP Configuration

2.1 GMRP Overview

GMRP (GARP Multicast Registration Protocol), based on GARP, is used for
maintaining multicast registration information of the switch. All GMRP-capable switches
can receive multicast registration information from other switches, dynamically update
local multicast registration information, and send their own local multicast registration
information to other switches. This information switching mechanism keeps
consistency of the multicast information maintained by every GMRP-supporting device
in the same switching network.
A host sends a GMRP Join message, if it is interested in joining a multicast group. After
receiving the message, the switch adds the port on which the message was received to
the multicast group, and broadcasts the message throughout the VLAN where the
receiving port resides. In this way, the multicast source in the VLAN gets aware of the
existence of the multicast group member. When the multicast source sends multicast
packets to a group, the switch only forwards the packets to ports connected to the
members of that group, thereby implementing Layer 2 multicast in the VLAN.

2.2 Configuring GMRP

The main tasks in GMRP configuration include:
Enable GMRP globally
Enable GMRP on a port
GMRP must be enabled globally before it is enabled on a port.

2.2.1 Enabling GMRP Globally

Follow these steps to enable GMRP globally:
Enter system view
Enable GMRP globally.

2.2.2 Enabling GMRP on the Port

Perform the following configuration to enable/disable GMRP on the port in Ethernet port
view:
To do... Use the command...
system-view
gmrp
—
Required
Disabled by default.
2-1
Chapter 2 GMRP Configuration
Remarks