
Configuring Traffic Filters and Protocol Prioritization
3-2 117348-A Rev. A
Transparent Bridge Criteria and Actions
Transparent bridge traffic filters support several encapsulation methods and media
types. You filter inbound transparent bridge frames based on the contents of the
header fields for one of the four supported encapsulation methods:
• Ethernet
• IEEE 802.2 LLC
• IEEE 802.2 LLC with SNAP
• Novell Proprietary
F
igure 3-1 illustrates the header reference fields for each encapsulation method.
Figure 3-1. Header Reference Fields for Transparent Bridge Encapsulation Methods
Table 3-1 indicates which encapsulation methods are supported for specific router
interfaces.
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/Control is 0xAAAA03
24-bit Organization Code
16-bit Ethernet Type
Ethernet
TypeCode
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
TF0007A
Comentarios a estos manuales