Vlan Restrictions - HP J3245A Installation And Configuration Manual

5.

VLAN Restrictions

N o t e
Operating problems associated with duplicate MAC addresses are likely to
occur in VLAN environments where XNS and DECnet are used. For this
reason, using VLANs in XNS and DECnet environments is not currently
supported on the Switch 800T.
Return to the Main menu. (It is not necessary to reboot the switch; the
new port assignments are implemented when you do the "save" in the
preceding step.)
Each port can be assigned to only one VLAN.
An external router must be used to communicate between two VLANs.
Duplicate MAC addresses on different VLANs are not supported and can
cause VLAN operating problems. These duplicates are possible and com-
mon in situations involving Sun workstations with multiple network
interface cards, with DECnet routers, and with certain Hewlett-Packard
routers using OS versions earlier than A09.70 where any of the following
are enabled:
• IPX
• IP Host-Only
• STP
• XNS
• DECnet
Currently, the problem of duplicate MAC addresses in IPX and IP Host-
Only environments is addressed through the HP router OS version
described below. However, for XNS and DECnet environments, a satis-
factory solution is not available from any vendor at this time.
If you assign a port to be the Network Monitoring Port, that port cannot
be configured as a member of any VLAN. If the port was previously
assigned to a VLAN (including the default VLAN), it will be automatically
removed from the VLAN when the Monitoring Port assignment is made.
When you subsequently disable the monitoring port assignment, the port
will be returned to the default VLAN.
Before you can delete a VLAN, you must move all of its ports to another
VLAN.
Advanced Concepts
Virtual LANs (VLANs)
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