Procedure For The Switch To Judge Packet Protocol; Encapsulation Formats; Implementation Of Protocol-Based Vlan - 3Com WX3000 Series Operation Manual

Procedure for the Switch to Judge Packet Protocol

Figure 1-9 Procedure for the switch to judge packet protocol
Ethernet II Ethernet II
0x0600 to 0xFFFF 0x0600 to 0xFFFF
encapsulation encapsulation
Match the Match the
type value type value
802.3 raw 802.3 raw
encapsulation encapsulation

Encapsulation Formats

Table 1-1 lists the encapsulation formats supported by some protocols. In brackets are type values of
these protocols.
Table 1-1 Encapsulation formats
Encapsulation
Protocol
IP (0x0800)
IPX (0x8137)
AppleTalk
(0x809B)

Implementation of Protocol-Based VLAN

The switching engines of the devices assign the packet to the specific VLAN by matching the packet
with the protocol template.
Receive Receive
packets packets
Type(Length) Type(Length)
field field
0 to 0x05DC 0 to 0x05DC
802.2/802.3 802.2/802.3
encapsulation encapsulation
Control Control
field field
Value is 3 Value is 3
dsap/ssap dsap/ssap
Both are FF Both are FF
value value
Other values Other values
802.2 LLC 802.2 LLC
encapsulation encapsulation
Match the Match the
dsap/ssap value dsap/ssap value
Ethernet II
Supported Not supported
Supported Supported
Supported Not supported
Invalid packets Invalid packets
that cannot be that cannot be
0x05DD to 0x05FF 0x05DD to 0x05FF
matched matched
Invalid packets Invalid packets
that cannot be that cannot be
Value is not 3 Value is not 3
matched matched
802.2 SNAP 802.2 SNAP
Both are AA Both are AA
encapsulation encapsulation
Match the Match the
type value type value
802.3 raw 802.2 LLC
Not supported
Supported
Not supported
1-7
802.2 SNAP
Supported
Supported
Supported