System information

2-38
Static Virtual LANs (VLANs)
Port-Based Virtual LANs (Static VLANs)
Effect of VLANs on Other Switch Features
Spanning Tree Operation with VLANs
Because the switch follows the 802.1Q VLAN recommendation to use single-
instance spanning tree, Spanning Tree operates across all ports on the switch
(regardless of VLAN assignments) instead of on a per-VLAN basis. This means
that if redundant physical links exist between the switch and another 802.1Q
device, all but one link will be blocked, regardless of whether the redundant
links are in separate VLANs. However, you can use port trunking to prevent
Spanning Tree from unnecessarily blocking ports (and to improve overall
network performance).
Note that Spanning Tree operates differently in different devices. For example,
in the (obsolete, non-802.1Q) ProCurve Switch 2000 and the ProCurve Switch
800T, Spanning Tree operates on a per-VLAN basis, allowing redundant phys-
ical links as long as they are in separate 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 Addresses
Some switch models use the same MAC address for all configured VLANs,
while other switch models use a different MAC address for each configured
VLAN.
One (Same) MAC Address for all VLANs Different MAC Address for Each VLAN
2600
2600-PWR
2610
2610-PWR
2810
2800
2510/2510G
3400cl
5300xl
6400cl
4100gl
6108