C Ontents - 3Com 3CRUS2475 User Manual

Feature
Fast Link
Full 802.1Q VLAN Tagging Compliance
GVRP Support
IGMP Snooping
LACP
Link Aggregated Groups
MAC Address Capacity Support
Description
STP can take up to 30-60 seconds to converge. During this time,
STP detects possible loops, allowing time for status changes to
propagate and for relevant devices to respond. 30-60 seconds is
considered too long of a response time for many applications. The
Fast Link option bypasses this delay, and can be used in network
topologies where forwarding loops do not occur.
IEEE 802.1Q defines an architecture for virtual bridged LANs, the
services provided in VLANs and the protocols and algorithms
involved in the provision of these services. An important
requirement included in this standard is the ability to mark frames
with a desired Class of Service (CoS) tag value.
GARP VLAN Registration Protocol (GVRP) provides IEEE
802.1Q-compliant VLAN pruning and dynamic VLAN creation on
802.1Q trunk ports. When GVRP is enabled, the device registers
and propagates VLAN membership on all ports that are part of the
active underlying Spanning Tree Protocol Features topology.
IGMP Snooping examines IGMP frame contents, when they are
forwarded by the device from work stations to an upstream
Multicast router. From the frame, the device identifies work stations
configured for Multicast sessions, and which Multicast routers are
sending Multicast frames.
LACP uses peer exchanges across links to determine, on an ongoing
basis, the aggregation capability of various links, and continuously
provides the maximum level of aggregation capability achievable
between a given pair of systems. LACP automatically determines,
configures, binds and monitors the port binding within the system.
Link Aggregated Group (LAG). The system provides up-to eight
Aggregated Links may be defined, each with up to eight member
ports, to form a single. LAGs provide:
Fault tolerance protection from physical link disruption
Higher bandwidth connections
Improved bandwidth granularity
High bandwidth server connectivity
LAG is composed of ports with the same speed, set to full-duplex
operation.
The device supports up to 8K MAC addresses. The device reserves
specific MAC addresses for system use.
Unified Switch 24 Features 311