Enterasys Networks CSX7000 Uživatelský manuál stáhnout pdf (Strana 286)

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USER’S GUIDE

286 CyberSWITCH

KNOWN CONNECT LIST CONFIGURATION ELEMENTS

DEVICE NAME

The name of a bridge device that has been preconfigured in the On-node Device Database section of

the Configuring Device Level Databases chapter. This is a device to which you want the system to

connect and forward bridged unicast packets.

KNOWN CONNECT LIST BACKGROUND INFORMATION

In Unrestricted Mode, standard bridge processing attempts to forward frames with unknown or

broadcast MAC addresses through all available interfaces. This can cause a problem with the

limited bandwidth and high cost of dial-up WAN links. The CyberSWITCH’s Known Connect List

feature, and its support of bridge filters, gives you flexible options in controlling the risk of bridge

flooding over WAN links.

When operating as a bridge or in IP Host Mode, in the course of processing the MAC frames, the

CyberSWITCH builds its bridge table and associates each MAC address it sees with an interface.

When a remote bridge establishes a connection and begins sending traffic to the CyberSWITCH,

the CyberSWITCH adds these remote addresses to its bridge table and associates the remote bridge

with them. Later, if the connection is dropped, and if the CyberSWITCH receives a packet destined

for one of the remote addresses, it will re-establish the connection with the remote bridge only if the

remote bridge is specified on the Known Connect List, or if a forwarding filter is configured.

Furthermore, if the Known Connect List option is used, the CyberSWITCH can only re-establish the

connection while the remote bridge is still “known”; that is, if the system receives the new,

outbound packet before the Spanning Tree Bridge Age Time timer ages-out the destination MAC

address from the bridge table. If a connect filter is used, the CyberSWITCH can re-establish the

connection regardless of how long it’s been since the last connection. The default Bridge Age Time

is 5 minutes. Refer to page 266 to change the default value.

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