HP 200 Series Services And Applications page 101
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- Installation manual (144 pages) ,
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Encapsulation Filters
Filters enable the bridge to either selectively relay or drop a particular frame
on the basis of header fields used with each of the four encapsulation
methods supported by the bridging service. These encapsulation methods
are as follows:
Ethernet
IEEE 802.2 logical link control
IEEE 802.2 LLC with SNAP header
Novell proprietary
Figures 33 through 36 illustrate each method of encapsulation.
Preamble
Destination
8 octets
6 octets
Figure 33. Ethernet Encapsulation
Ethernet version 2 encapsulation (shown in figure 33) prefixes an eight-octet
preamble, six octets of destination-address information, six octets of source-
address information, and two octets of protocol-type information to the
frame. It appends a four-octet frame check sequence to the frame.
DSAP
SSAP
1 octet
1 octet
Figure 34. 802.2 Encapsulation
802.2 encapsulation (shown in figure 34) prefixes one octet of destination
service access point identification, one octet of source service-
access-point identification, and one octet of control information to the
frame. The 802.2 frame, in turn, will be encapsulated within a MAC-level
media-specific frame.
Encapsulation Filters
Source
Type
6 octets
2 octets
Control
Data
1 octet
46–1500 octets
Bridging Service
Data
46–1500 octets
2-49
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