3Com LANplex 6000 Kurulum Kılavuzu - Sayfa 2

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TRSM Description

The Token Ring Switching Module (TRSM) is designed to add Token Ring

(TR) switching functionality to the LANplex 6000, providing the most cost

effective solution for introducing segmentation for today's Token Ring

networks, while allowing you to prepare for future higher bandwidth

requirements such as multimedia applications.

The TRSM has eight shielded RJ-45 token ring ports on the front of the

module and one FDDI backplane attachment which may be connected to

any of the three LANplex chassis FDDI backplanes. All eight token ring

switch ports support a full ring of 260 stations, with two of the ports able to

accommodate direct station attachment for dedicated bandwidth to ﬁle

servers and other critical resources. The shielded RJ-45 ports allow for

attachment via Type 1 STP or Type 3, 4, or 5 UTP copper cable. Each port is

independently conﬁgurable to support either 4 Mbps or 16 Mbps operation.

TRSM Conﬁgurable

The TRSM is architected to support both source routed or transparent

Bridge Modes

trafﬁc types in the following modes:

Transparent (T)

Source Routing (SR)

Source Routing-Transparent Bridge (SRT)

Transparent

The TRSM fully complies with the IEEE 802.1d bridging standard, which

means that the module:

Learns source addresses from packets transmitted by stations on LANs

attached to TRSM ports

Ages addresses of stations on attached LANs that have not transmitted a

packet for a prolonged time

Stores and forwards packets from one attached LAN to another

Uses the Spanning Tree protocol for loop detection

The TRSM automatically "learns" the MAC-layer addresses of the stations on

its attached networks, and then forwards packets to their appropriate

destinations. Packet forwarding is based on learned or statically conﬁgured

MAC addresses. The TRSM can learn up to 8192K addresses. Additional

addresses are learned as addresses are aged out. All addresses are stored in