Airlive POE-GSH1602M handleiding
Handleiding
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Meanings of 802.1q tag fields
Field
Length
Name
Analysis
TPID
2 bytes
Tag Protocol Identifier to
describe the frame type
It refers to the 802.1q Tag frame when
the value is 0x8,100, which will be
discarded if relevant equipment fails to
receive it.
PRI
3 bits
Frame Priority
It ranges from 0 to 7, with the higher
priority represented by larger number.
Data frame with higher priority will be
sent preferentially in case of switch
congestion.
CFI
1 bit
Canonical Format
Indicator to reveal whether
the MAC address is
classical or not.
MAC address is classical when CFI is 0
and non-classical when CFI is 1. It
promotes the compatibility between
Ethernet and token ring. CFI will be 0 in
the Ethernet.
VID
12 bits
VLAN ID indicates the
VLAN to which the frame
belongs.
It ranges from 0 to 4,095, with 1 to 4,094
valid since 0 and 4,095 are the protocol
retention values.
Packets sent by each switch supporting 802.1q protocol contain a VLAN ID to indicate
the VLAN to which the switch belongs. Therefore, Ethernet frames are divided into two
types as follows in a VLAN switching network:
⚫ Tagged frame: it refers to the frame adding a 4-bit 802.1q Tag.
⚫ Untagged frame: it refers to the original frame without a 4-bit 802.1q Tag.
Connected with other switches, Trunk interfaces mainly connect trunk links to allow
the VLAN frames to flow through.
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Productinformatie
| Merk | Airlive |
| Model | POE-GSH1602M |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 71337 MB |
