Enterasys Networks CSX7000 Uživatelský manuál stáhnout pdf (Strana 273)

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Central Site Remote Access Switch 273

ONFIGURING

DVANCED

RIDGING

Bridge Filters

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:

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

previously defined protocol definitions will remain unchanged.

MAC address filters reference either the source or destination MAC address fields in a packet.

Protocol filters use the protocol Id field in a packet. Packet data filters reference data outside the

address and protocol fields in a packet. Each filter has a distribution list that identifies the potential

destinations for a filtered packet.

For each filter category, there are three filtering actions that the system can perform on a packet:

discard, forward, or connect.

ROTOCOL DEFINITIONS

If you configure any protocol filters, you must first configure any needed protocol definitions. After

you define a protocol filter, it will automatically be assigned a protocol Id. The protocol Id is a

required field when configuring a protocol filter.

You can define up to 10 protocol definitions. These definitions represent the protocol Id tokens for

the protocol filter commands to use. Users specify the protocol name, and also the protocol Id value

for the Ethernet type field and/or the 802.3 LSAP field.

Inspecting the 13th and 14th bytes of the MAC frame determines the packet format. These bytes are

the length field in an 802.3 format frame, and are the Ethernet type field in an Ethernet format

frame. If the value of the byte is less than hexadecimal 600, the packet is 802.3 format and the LSAP

field is used for the protocol Id. If the value is greater than or equal to hexadecimal 600, the packet

is Ethernet format and the Ethernet type field is used for the protocol Id.

Filter Type Maximum

Number of Each

source MAC address

filter

destination MAC

address filter

protocol filter 40

packet data filter 60

hardware filter 63

(in manual mode)

1 2 ... 268 269 270 271 272 273 274 275 276 277 278 ... 728 729

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