Modifying the Transparent Bridge ConfigurationUse the Bridge Interface Add/Modify window to modify the configuration information for a port. Enabling and Disabling the Spanning Tree ProtocolYou can enable and disable the Spanning Tree Protocol (STP) on a specific port, if the port currently exists. STP is automatically enabled (the default) on all bridge ports at installation. Caution: It is recommended that you keep STP enabled on all ports. Disabling STP may result in loops and severe network congestion. Procedure:
For background information on the STP, see About the Spanning Tree Protocol. Forwarding Frames Using Manually Created Address FiltersBy enabling manual mode, you can configure the line card to forward frames using only manually created address filters. Doing so allows you to strictly control traffic through selected ports and can provide an additional level of security to the desired subnetworks. For example, you may want to operate a port securely so that only one system is allowed to source and sink traffic on that port. To do so, you enable manual mode on the port.You then create an address filter entry (permanent or static) for that system's MAC address, specifying only that port in the filter's allowed port map. In addition, if you want multicast or broadcast frames to be forwarded to that port, you must create an address filter for each such address, specifiying at least that port in the allowed port map. You configure the use of only manually created filters by enabling manual mode on selected ports. When manual mode is enabled, the port's forwarding table that contains learned addresses is purged, and new addresses are not learned. However, you can still configure new MAC address filters manually. See Configuring Permanent Address Filters for information about configuring filters manually. The addresses and locations of other network devices are relearned if manual mode is later disabled. Field Descriptions
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