1. Introduction-14
1.2.7 Class-of-Service (CoS) Support
The switch provides four transmit queues on each port, with a
weighted round-robin scheme. These functions can be used to
provide independent priorities for various types of data including
real-time video, real-time voice, and best-effort data.
Priority assignment to packet-based switches is accomplished
through explicit assignment by end stations, which have
applications that require a higher priority than best-effort data.
This mechanism utilizes the IEEE802.1p and 802.1Q tag
structure, which the switch uses to decide priority assignments
for the received packets.
1.2.8 GVRP
In addition to network management tools that allow network
administrators to statically add and delete VLAN member ports,
the routing switch supports GARP VLAN Registration Protocol
(GVRP). GVRP supports dynamic registration of VLAN port
members within a switch and across multiple switches.
In addition to dynamically updating registration entries within a
switch, GVRP is used to communicate VLAN registration
information to other VLAN-aware switches, so that members of a
VLAN can cover a wide span of switches on a network.
GVRP allows both VLAN-aware workstations and switches to
issue and revoke VLAN memberships. VLAN-aware switches
register and propagate VLAN membership to all ports that are
part of the active topology of the VLAN.
