Airlive L3-XGF28 handleiding
Handleiding
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47
PVID: whether the VLAN is the port PVLAN
7.1.4 Port Setting
Trunk configuration. Connected with other switches, Trunk interfaces mainly
connect trunk links to allow the VLAN frames to flow through. IEEE 802.1q is the
encapsulation protocol of Trunk link and considers the formal standard for Virtual
Bridged Local Area Networks. It changes the frame format of Ethernet by adding a 4-bit
802.1q Tag between the source MAC address field and the protocol field.
802.1q frame format
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:
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Productinformatie
| Merk | Airlive |
| Model | L3-XGF28 |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 29079 MB |
