Dell PowerConnect 8024 User Manual

Managing a Switch Stack 171
NSF in the Data Center
Figure 9-12 illustrates a data center scenario, where the stack of two
PowerConnect switches acts as an access switch. The access switch is
connected to two aggregation switches, AS1 and AS2. The stack has a link
from two different units to each aggregation switch, with each pair of links
grouped together in a LAG. The two LAGs and link between AS1 and AS2 are
members of the same VLAN. Spanning tree is enabled on the VLAN. Assume
spanning tree selects AS1 as the root bridge. Assume the LAG to AS1 is the
root port on the stack and the LAG to AS2 is discarding. Unit 1 is the stack
master. If unit 1 fails, the stack removes the Unit 1 link to AS1 from its LAG.
The stack forwards outgoing packets through the Unit 2 link to AS1 during
the failover. During the failover, the stack continues to send BPDUs and LAG
PDUs on its links on Unit 2. The LAGs stay up (with one remaining link in
each), and spanning tree on the aggregation switches does not see a topology
change.
Figure 9-12. Data Center Stack Topology

Dell PowerConnect 8024 Specifications

General

Switching Capacity	480 Gbps
Stackable	Yes
Device Type	Switch
Enclosure Type	Rack-mountable
Power Redundancy	Optional
Width	17.3 in
Height	1.7 in
Jumbo Frame Support	Yes
Ports	24 x 10 Gigabit SFP+
Management	Web-based GUI, Command Line Interface (CLI), SNMP
VLAN Support	Yes
Power Supply	Internal
Routing Protocol	Static routing
Features	Quality of Service (QoS), VLAN support
Compliant Standards	IEEE 802.3, IEEE 802.3u, IEEE 802.3ab, IEEE 802.3z
Operating Temperature	0 to 45 °C
Storage Temperature	-20 to 70 °C
Relative Humidity	10% to 90% (non-condensing)
MAC Address Table Size	32, 000 entries