2
S
UMMIT
V
IRTUAL
C
HASSIS
D
ESIGN
AND
I
NSTALLATION
G
UIDE
S
UMMARY
OF
F
EATURES
I
NCREASED
P
ORT
D
ENSITY
The Summit Virtual Chassis can be combined with any member of the Summit switch
family. When four Summit Virtual Chassis are used with eight Summit1 switches, up to
32 Gigabit Ethernet ports can be connected using the Virtual Chassis external backplane.
When two Virtual Chassis are combined with eight Summit48 switches, up to 384
10/100 Mbps Ethernet ports can be connected. A single Virtual Chassis connected to
eight Summit3 switches provides 192 10/100 Mbps ports.
P
OLICY
-B
ASED
Q
UALITY
OF
S
ERVICE
(Q
O
S)
Policy-based QoS is a feature of the Summit switch family. QoS profiles are defined in
the Summit switch, and allow you to specify priority, and minimum and maximum
bandwidth per traffic group. You can define QoS traffic groups based on the following:
•
Internet Protocol (IP) destination address
•
Virtual LAN (VLAN) (including IP subnet or protocol)
•
Media Access Control (MAC) destination address
•
Physical source port
•
802.1p prioritization
ExtremeWare
™
software running on the Summit switch maps the QoS profiles into
queues on each port of the switch. When up to eight Summit switches are connected to
a Summit Virtual Chassis, four interconnecting queues for each switch (totaling 32
queues) are allocated on each Summit Virtual Chassis link.
L
OAD
-S
HARING
L
INKS
For increased fault tolerance, throughput, and bandwidth, two- or 4four-port
load-sharing links can be used to create parallel paths between Summit switches and
two or four Summit Virtual Chassis.
Figure 1 shows two Summit1 switches connected using four parallel paths to four
Summit Virtual Chassis. The result is a full mesh of parallel paths between each Summit
switch and the Summit Virtual Chassis.
virtchas.book Page 2 Friday, May 29, 1998 10:08 AM
