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11 - 8 Aironet 340 Series Bridge
n The first 16 bits of the data portion contains a value that is greater
than the maximum data size (1518). The value is assumed to be a
protocol identifier that may be used to determine which protocol is
being used within the packet.
n The first 16 bits of the data portion contains a value that is less than
the maximum data size. The value is interpreted as a frame length
and it is assumed that a IEEE 802.2 Logical Link Control (LLC)
header follows the length.
The format of the LLC header is as follows:
DSAP, 8 bits, Destination Service Access Point (DSAP)
SSAP, 8 bits, Source Service Access Point (SSAP)
CTL, 8 bits, Control field
If the control field has a value 3 (for an un-numbered information
frame), then this header may be followed by:
OUI, 24 bits, Organization Unique Identifier (OUI)
SAP-PROT, 16 bits, Protocol Identifier
You may set up filters based on either a protocol identifier or a DSAP/
SSAP combination. If the filter is based on SAPs and the control field
has a value of 3, the packet may also be optionally filtered based on the
OUI and LLC protocol fields.
Both types of filters may also use a variable length bit mask of the
packet contents to further specify which packets should be filtered.
Filter Protocols Menu
Option Value Description
1 - Default [ off ] - Default action
2 - Display - Display the protocol filters
3 - Add - Add a protocol filter
4 - Remove - Remove a protocol filter
5 - Length [ 22 ] - Length of packet data to log
6 - Monitor [ off ] - Protocol monitoring enabled
7 - Show - Show forwarded protocol list
8 - Clear - Clear forwarded protocol list
Enter an option number or name, “=” main menu, previous menu
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