
Inbound Traffic Filter Criteria and Actions
3-3
Figure 3-1. Headers of Encapsulation Methods Supported by Transparent Bridge Filters
Predefined Transparent Bridge Criteria
Table 3-2 lists the predefined filtering criteria for each encapsulation method,
including the header reference field, offset, and length value for each predefined
criterion.
Table 3-2. Predefined Criteria for Transparent Bridge Encapsulations
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
(continued)
DSAP
SSAP
Control
Org.
IEEE 802.2 LLC with SNAP Encapsulation
MAC
Destination
MAC
Source
48-bit MAC destination address
48-bit MAC source address
16-bit length/type is LENGTH (<1519)
DSAP/SSAP/CTRL is 0xAAAA03
24-bit Organizational Code
16-bit Ethertype
Ether-
type
Code
MAC
MAC
Ethernet Header
48-bit MAC destination address
48-bit MAC source address
16-bit length/type is TYPE (>1518)
Destination
Source
MAC
Destination
MAC
Source
Length/
Type
48-bit MAC destination address
48-bit MAC source address
16-bit length/type is LENGTH (<1519)
next 16 bits are all ones (part of IPX header)
Novell Proprietary Encapsulation
FF FF
48-bit MAC destination address
48-bit MAC source address
16-bit length/type is LENGTH (<1519)
8-bit DSAP
8-bit SSAP
8-bit Control
IEEE 802.2 LLC Header
MAC MAC
Destination
Source
DSAP SSAP Control
Length/
Type
Length/
Type
Length/
Type
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