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Inbound Traffic Filter Criteria and Actions
117348-A Rev. A 3-3
Predefined Transparent Bridge Criteria
Each transparent bridge encapsulation method has specific, predefined criteria for
filtering frames. These predefined criteria are based on an offset to a header
reference field (F
igure 3-1) and are a specified length. Table 3-2 lists the
predefined criteria for each encapsulation method, and the reference field, offset,
and length for each criterion.
Table 3-1. Transparent Bridge Encapsulation Support
Router Interface
Encapsulation Method
Ethernet 802.2 LLC LLC with SNAP Novell
Ethernet/802.3 (XCVR) Yes Yes Yes Yes
FDDI (FDDI) No Yes Yes No
Token ring (TOKEN) No Yes Yes No
Synchronous (COM) Yes Yes Yes Yes
Table 3-2. Predefined Criteria for Transparent Bridge Inbound Traffic
Filters
Encapsulation
Method Criterion Name
Reference
Field
Offset
(bits)
Length
(bits)
All MAC Source Address MAC 0 48
MAC Destination Address MAC 48 48
Ethernet Ethernet Type MAC 96 16
802.2 LLC Length
(Ethernet/802.3 and PPP only)
MAC 96 16
SSAP DATA_LINK 0 8
DSAP DATA_LINK 8 8
Control DATA_LINK 16 8
802.2 LLC
with SNAP
Length MAC 96 16
Organization Code (Protocol ID) DATA_LINK 24 24
Ethernet Type DATA_LINK 48 16
Novell Novell MAC 112 16
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