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Port-Based Virtual LANs (VLANs) and GVRP
Port-Based Virtual LANs (Static VLANs)
IP Interfaces
There is a one-to-one relationship between a VLAN and an IP network inter-
face. Since the VLAN is defined by a group of ports, the state (up/down) of
those ports determines the state of the IP network interface associated with
that VLAN. When a VLAN comes up because one or more of its ports is up, the
IP interface for that VLAN is also activated. Likewise, when a VLAN is
deactivated because all of its ports are down, the corresponding IP interface
is also deactivated.
VLAN MAC Address
The Series 5300XL switches have one unique MAC address for all of their VLAN
interfaces. You can send an 802.2 test packet to this MAC address to verify
connectivity to the switch. Likewise, you can assign an IP address to the VLAN
interface, and when you Ping that address, ARP will resolve the IP address to
this single MAC address.
Port Trunks
When assigning a port trunk to a VLAN, all ports in the trunk are automatically
assigned to the same VLAN. You cannot split trunk members across multiple
VLANs. Also, a port trunk is tagged, untagged, or excluded from a VLAN in the
same way as for individual, untrunked ports.
Port Monitoring
If you designate a port on the switch for network monitoring, this port will
appear in the Port VLAN Assignment screen and can be configured as a
member of any VLAN. For information on how broadcast, multicast, and
unicast packets are tagged inside and outside of the VLAN to which the
monitor port is assigned, see
“VLAN-Related Problems” on page C-19.
VLAN Restrictions
A port must be a member of at least one VLAN. In the factory default
configuration, all ports are assigned to the default VLAN
(DEFAULT_VLAN; VID = 1).
A port can be assigned to several VLANs, but only one of those assign-
ments can be untagged. (The “Untagged” designation enables VLAN oper-
ation with non 802.1Q-compliant devices.)
An external router must be used to communicate between tagged VLANs
on the switch.
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