User guide

E
XTREME
W
ARE
S
OFTWARE
U
SER
G
UIDE
6-9
T
YPES OF
VLAN
S
M
IXING
P
ORT
-B
ASED AND
T
AGGED
VLAN
S
You can configure the switch using a combination of port-based and tagged VLANs. A
given port can be a member of multiple VLANs, with the stipulation that only one of its
VLANs uses untagged traffic. In other words, a port can simultaneously be a member of
one port-based VLAN and multiple tag-based VLANs.
For the purposes of VLAN classification, packets arriving on a port with an
802.1Q tag containing a VLANid of zero are treated as untagged.
P
ROTOCOL
-B
ASED
VLAN
S
Protocol-based VLANs enable you to define a packet filter that the switch uses as the
matching criteria to determine if a particular packet belongs to a particular VLAN.
Protocol-based VLANs are most often used in situations where network segments
contain hosts running multiple protocols. For example, in Figure 6-6, the hosts are
running both the IP and NetBIOS protocols.
The IP traffic has been divided into two IP subnets, 192.207.35.0 and 192.207.36.0. The
subnets are internally routed by the switch. The subnets are assigned different VLAN
names, Finance and Personnel, respectively. The remainder of the traffic belongs to the
VLAN named MyCompany. All ports are members of the VLAN MyCompany.