Enterasys Networks Enterasys Vertical Horizon VH-8G - Manual (Page 22)

8 Product Overview VH-8G
control per the IEEE 802.3x standard. Note that flow control is disabled on
all ports by default but can be enabled on a per-port basis by using the
console interface menus, the on-board Web agent, or via SNMP. See
Appendix B, “Flow Control,” for more information on this feature.
Virtual LANs (VLANs)
VLANs allow you to connect users to a specific LAN segment regardless
of their physical location. The VH-8G switch supports tagged VLANs per
the IEEE 802.1Q standard. With frame tagging, a short tag is appended
to every frame that crosses the network backbone. The tag identifies
which VLAN the frame belongs to. See Appendix B, “Virtual LANs,” in the
VH-8G Management Guide for more information.
Class of Service
Class of Service support allows you to assign a higher priority to selected
traffic passing through the switch. The VH-8G switch supports Class of
Service attributes per the IEEE 802.1p standard using a priority queuing
mechanism. This feature ensures that traffic during congestion periods
will not interfere with traffic assigned a higher priority. Traffic assigned a
lower priority is subject to discard when memory is in short supply. See
Appendix C, “Class of Service,” in the VH-8G Management Guide for
more information.
Port Trunking
Port trunking allows you to combine ports into an aggregate connection
between VH-8G switches. Besides balancing the load across each port in
the trunk, the additional ports provide redundancy by taking over the load
if a port in the trunk should fail. The VH-8G allows up to four ports to be
joined together as a trunk. Up to four port trunks on a single switch can be
configured. Each trunk can combine two, three, or four ports, creating an
aggregate bandwidth of up to 8Gbps.
If flow control is desired for one port, it is recommended that
it be enabled on all ports.
VH-8g.book Page 8 Friday, November 17, 2000 5:29 PM