HP 200 Series Services And Applications page 289

Bridging Over Frame Relay
The encoding of the NLPID field for bridged packets is the same as that used
for network layers not having a specific NLPID value—80 hex. This again
specifies a SNAP header; however, the encoding of the SNAP header is 00 80
C2, the organizational identifier of the IEEE 802.1 Committee. Table 5 shows
how a bridged frame is encoded.
Table 5. SNAP Header for Bridging
00 (hex)
IEEE 802.1
Organization
80 (hex)
Code
C2 (hex)
xx (hex)
Protocol ID
PID
xx (hex)
Complete
Bridged
Frame
The PID (Protocol ID) field identifies the media type and whether or not the
LAN FCS is appended to the bridged frame. The PID values are shown in
table 6.
Table 6. PID Values for Bridged Frames
With Without
Preserved FCS Preserved FCS
00 - 01 00 - 07
00 - 02 00 - 08
00 - 03 00 - 09
00 - 04 00 - 0A
00 - 05 00 - 0B
00 - 0E
Linking Up with Frame Relay
Frame Relay Data-Link Interface
Medium
802.3/Ethernet
802.4 (Token Bus)
802.5 Token Ring
FDDI
802.6
Bridge BPDU
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