UTStarcom iSpirit 3026 Manual page 11

can belong to multiple Tagged VLAN(identified by VLAN IDs) and one Untagged VLAN. The
range for VLAN Ids is from 1 from 4094. The iSpirit 3026 switch can have as many as 256
VLANs.
3.The application of tagged VLAN
Tagging is mostly used for VLAN configuration across multiple switches, where the connection
between switches is usually called "relay". After tagging, a VLAN can be created among multiple
switches through one or more relays.
Another advantage for using tagging is that a port can belong to multiple VLANs, which is very
useful when you have a device(such as a server) that needs to belong to multiple VLANs, but
the device should have a network interface card which supports 802.1Q.
4.VLAN tag assignment
Every VLAN can be assigned a 802.1Q VLAN Tag. When a port is added to a VLAN with a
802.1Q Tag, it's up to your choice whether it uses the VLAN tag. By default all ports on a switch
belong to a default VLAN, but they don't use the VLAN ID of this default VLAN, it's not necessary
for all ports to use a VLAN tag. When data packets are transmitted out of a port, the switch will
determine whether adding or removing the VLAN tag to/from the data packets based on the
VLAN configuration on the port.
5.Co-usage of tagged VLAN and port-based VLAN
You can co-use Tagged VLAN and Port-based VLAN. A port can belong to multiple VLAN, if it
only belongs to one untagged VLAN. In another word, a port can belong to one Port-based
VLAN and multiple Tagged VLAN.
1.4.3 STP(Spanning Tree Protocol)
The iSpirit 3026 switch support STP protocol with IEEE802.1d standard. STP runs on bridges
and switches, it's a layer 2 protocol and is compatible with 802.1d standard. STP provides the
dynamic switching between redundant devices in the network, thus you can setup backup
communication channels in the network using STP, which guarantees that:
(1) The backup channel is close when the main channel is working normally;
(2) When the main channel breaks down, the backup channel is activated automatically,