Cabletron Systems CSX1200, CSX1000 Bridge Filters Background Information, Filter Destination MAC

CONFIGURING ADVANCED BRIDGING

Bridge Filters

DISTRIBUTION LIST

A distribution list is defined as the WAN and/or LAN ports to which the filter action will be applied. The distribution list is selected from a displayed list of possible choices (LAN, WAN, Device Table, or all destinations).

MASK

Hexadecimal number up to 80 characters in length that specifies which bits in the data packets are significant. There must be an even number of hexadecimal digits in the number. A scale will be displayed to help you enter the Mask accurately.

DATA VALUE

Hexadecimal number up to 80 characters in length that specifies the value used to determine if the packet matches the filter. The value field must be a subset of the mask field. That is, the value field logically “anded” with the mask field must be equal to the value field. The value and mask fields must have equal lengths. There must be an even number of hexadecimal digits in the number.

PACKET OFFSET

A decimal number between 1 and 100 that indicates the starting offset in a data packet where a packet filter will begin its data comparison.

PROTOCOL-ID

The symbolic name for the Ethernet protocol to be filtered. The protocol-Id is selected from a displayed list of previously defined protocols. (Refer to the section titled Protocol Definitions.)

BRIDGE FILTERS BACKGROUND INFORMATION

User-defined bridge filters allow you to filter unwanted traffic out of the network. The following table lists the four different types of bridge filters and the maximum number of filters that can be configured for each type:

Filter Type	Maximum
	Number of Each
source MAC address	50
filter
destination MAC	50
address filter
protocol filter	40
packet data filter	60
hardware filter	63

(in manual mode)

Note: If the mode of operation is changed, any previously defined filters will be deleted. Any previously defined protocol definitions will remain unchanged.

Workgroup Remote Access Switch 225