Planet IGS-801T [52/120] Port vlan id
Макгруп McGrp.ru
Задайте вопрос
Зарегистрироваться

Planet IGS-801T [52/120] Port vlan id

Planet IGS-801T [52/120] Port vlan id
User’s Manual of IGS-801M
■
Port VLAN ID
Packets that are tagged (are carrying the 802.1Q VID information) can be transmitted from one 802.1Q compliant networ
device to another with the VLAN information intact. This allows 802.1Q VLAN to span network devices (and indeed, th
entire network – if all network devices are 802.1Q compliant).
efault VLAN
k
e
Every physical port on a switch has a PVID. 802.1Q ports are also assigned a PVID, for use within the switch. If no VLAN
are defined on the switch, all ports are then assigned to a d with a PVID equal to 1. Untagged packets are
assigned the PVID of the port on which they were received. Forwarding decisions are based upon this PVID, in so far as
VLAN are concerned. Tagged packets are forwarded according to the VID contained within the tag. Tagged packets are
Tag-aware switches must keep a table to relate PVID within the switch to VID on the network. The switch will compare the
ID of a packet to be transmitted to the VID of the port that is to transmit the packet. If the two VID are different the switch
acket. Because of the existence of the PVID for untagged packets and the VID for tagged packets,
tag-aware and tag-unaware network devices n the same net
A switch port can have only one PVID, but can h an ory in its VLAN table to store
em.
Because some device naw de at each port on a tag-aware device
before packets are transmitted – shoul ag or not? If the transmitting port is
connected to a tag-unaware device, the packet should be untagged. If the transmitting port is connected to a tag-aware
evice, the packet should be tagged.
■ Default VL
he Switch initially configures one VLAN, VID = 1, called "default." The factory default setting assigns all ports on the
Switch to the "default". As new VLAN are configured in Port-based mode, their respective member ports are removed
also assigned a PVID, but the PVID is not used to make packet forwarding decisions, the VID is.
V
will drop the p
can coexist o work.
ave as m y VID as the switch has mem
th
s on a network may be tag-u are, a decision must be ma
d the packet to be transmitted have a t
d
ANs
T
from the "default."
1 No matter what basis is used to uniquely identify end nodes and assign these nodes
VLAN membership, packets cannot cross VLAN without a network device performing a
ng function between the VLAN.
2 The Switch supports Port-based VLAN and IEE The port untagging
function ca e ag from packet headers to maintain
compatibility with devices that are tag-unaware.
routi
E 802.1Q VLAN.
n be used to remov the 802.1 t
■ Assigning Ports to VLANs
efore enabling VLANs for the switch, you must first assign each port to the VLAN gr ll participate. By
default all ports are assigned to VLAN 1 a g Add a port as a tagged port if you want it to carry traffic for one
r more VLANs, and any intermediate network devices or the host at the other end of the connection supports VLANs.
Then assign ports on the other VLAN-aware network devices along the path that will carry this traffic to the same VLAN(s),
B oup(s) in which it wi
s unta ged ports.
o
52

Содержание

Похожие устройства

Скачать