Gvrp Mechanism - H3C S7500 Series Operation Manual

Operation Manual – GVRP
H3C S7500 Series Ethernet Switches
The destination MAC addresses of the packets of the GARP participants are specific
multicast MAC addresses. A GARP-supporting switch will classify the packets received
from the GARP participants and process them with corresponding GARP applications
(GVRP or GMRP).
GARP and GMRP are described in details in the IEEE 802.1p standard (which has
been added to the IEEE802.1D standard). H3C Series Ethernet Switches fully support
the GARP compliant with the IEEE standards.
Note:
The value of GARP timer will be used in all the GARP applications, including GVRP
and GMRP, running in one switching network.
In one switching network, the GARP timers on all the switching devices should be
set to the same value. Otherwise, GARP application cannot work normally.

1.1.2 GVRP Mechanism

I. GARP Timers
GARP timers include Hold timer, Join timer, Leave timer and LeaveAll timer.
Hold: When a GARP participant receives a piece of registration information, it
does not send out a Join message immediately. Instead, to save the bandwidth
resources, it starts the Hold timer, puts all registration information it receives
before the timer times out into one Join message and sends out the message after
the timer times out.
Join: To transmit the Join messages reliably to other entities, a GARP participant
sends each Join message two times. The Join timer is used to define the interval
between the two sending operations of each Join message.
Leave: When a GARP participant expects to unregister a piece of attribute
information, it sends out a Leave message. Any GARP participant receiving this
message starts its Leave timer, and unregisters the attribute information if it does
not receives a Join message again before the timer times out.
LeaveAll: Once a GARP participant starts up, it starts the LeaveAll timer, and
sends out a LeaveALL message after the timer times out, so that other GARP
participants can re-register all the attribute information on this participant. After
that, the participant restarts the LeaveAll timer to begin a new cycle.
II. GVRP port registration mode
GVRP has the following three port registration modes: Normal, Fixed, and Forbidden.
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Chapter 1 GVRP Configuration