Dell | PowerConnect 5316M | Link Aggregation Interoperability of the Dell PowerConnect 5316M

Link Aggregation Interoperability of the Dell PowerConnect 5316M
NETWORK AND COMMUNICATIONS
Link Aggregation Interoperability
of the Dell PowerConnect 5316M Switch and Cisco Switches
This article explains how to configure the Dell™ PowerConnect™ 5316M Gigabit Ethernet
switch, which resides within the Dell Modular Server Enclosure, to interoperate and
connect with Cisco IOS-based and CatOS-based switches by using industry-standard
link aggregation groups that adhere to the IEEE 802.3ad standard.
BY BRUCE HOLMES
Related Categories:
Blade servers
T
he Cisco IOS and CatOS operating systems run on Cisco
tion. Static configuration is used when connecting the
network switches and provide Cisco EtherChannel,
Dell PowerConnect 5316M Gigabit Ethernet switch to an
Fast EtherChannel (FEC), and Gigabit EtherChannel
external Gigabit Ethernet switch that does not support
(GEC) technologies, which enable network administra-
LACP. In a static configuration, a cabling or configura-
Command line interface (CLI)
tors to group ports on Cisco switches together to increase
tion mistake involving the PowerConnect 5316M or the
Data networking
available throughput. Dell PowerConnect switches offer
external switch could go undetected and thus could cause
a similar technology known as link aggregation groups
undesirable network behavior. Both static and dynamic
(LAGs), which are designed to increase the overall band-
LAGs (via LACP) can detect physical link failures within
Cisco
Dell PowerConnect switches
Dell PowerEdge blade servers
width between two Dell switches by aggregating multiple
the LAG and continue forwarding traffic through the other
Ethernet
ports to act as a single, logical connection between the
connected links within that same LAG. LACP can also
Internetworking
Scripting
switches. Dell PowerConnect 5316M switches implement
detect switch or port failures that do not result in the
IEEE 802.3ad–based link aggregation, which is interoper-
loss of a link, helping provide a more resilient LAG. Best
able with Cisco EtherChannel technology.1
Link aggregation on Dell PowerConnect switches can
Visit www.dell.com/powersolutions
for the complete category index.
practices suggest using dynamic link aggregation instead
of static link aggregation.
be configured as either dynamic or static. The dynamic
The examples presented in this article use the command-
configuration uses the IEEE 802.3ad standard, which is
line interface (CLI) of the Dell PowerConnect 5316M to con-
also known as Link Aggregation Control Protocol (LACP).
figure the switch.2 These example configurations also can
LACP enables a Gigabit Ethernet switch to confirm that
be implemented via the Web-based graphical user interface
the external switch is also configured for link aggrega-
(GUI) of the PowerConnect 5316M.3
1 In dynamic configurations, this interoperability is possible only via LACP, not the proprietary Cisco Port Aggregation Protocol (PAgP). Link aggregation interoperability for all Dell PowerConnect
products is tested at the University of New Hampshire InterOperability Lab. This lab tests products for the Bridge Functions Consortium, which includes leading vendors of switch and networking
products. For more information, visit ftp://ftp.iol.unh.edu/pub/bfc/testsuites/la.io.test.suite.pdf.
2 For more information about configuring LAGs via the CLI., see the “Port Channel Commands” section of the Dell PowerConnect 5316M CLI Reference Guide
e at support.dell.com/support/edocs/
network/PC5316M/en/CLI/portchan.htm#1016308.
3 For more information about configuring LAGs via the GUI, see the “Defining LAG Parameters” section of the Dell PowerConnect 5316M Ethernet Switch Module User’s Guide
e at support.dell.
com/support/edocs/network/PC5316M/en/UG/switch.htm#1125197.
www.dell.com/powersolutions
Reprinted from Dell Power Solutions, February 2006. Copyright © 2006 Dell Inc. All rights reserved.
DELL POWER SOLUTIONS
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NETWORK AND COMMUNICATIONS
Link aggregation with Gigabit Ethernet switches
The first command sets the CLI mode to configure the six exter-
The following examples show minimal configurations necessary
nal Gigabit Ethernet ports (referred to in the command as g11-16,
to establish a LAG between a Cisco IOS-based Gigabit Ether-
which represents Gigabit Ethernet ports 11 through 16). All 6 ports
net switch (Catalyst 3750), Cisco CatOS-based Ethernet switch
do not have to be selected; a LAG can have from zero to six ports,
(Catalyst 6509), and the Dell PowerConnect 5316M Gigabit
depending on the requirements of the network. The number of ports
Ethernet switch. These commands should work properly when
in the LAG correlates to the amount of bandwidth and redundancy
using the default configuration of each switch. Note: These com-
achievable in the network—that is, the more ports, the more band-
mands will erase any configuration data previously configured
width and redundancy. A LAG can even be configured without any
and reboot the switch.
member ports. When ports are added to the LAG, they will be set
To set the Dell PowerConnect 5316M to the default configuration, administrators should issue the following commands:
to the configuration of the LAG.
The second command aggregates the six ports into a LAG
(referred to in the command as channel-group), which will
5316M# delete startup-config
use LACP (referred to in the command as mode auto). The
5316M# reload
channel-group number, which is 1 in this example, has meaning
only within the switch and is used to differentiate up to eight
To set the Cisco IOS-based Catalyst 3750 switch to the default
unique channel-groups. For each LAG created, administrators
configuration, administrators should issue the following com-
must designate it with a number between one and eight for up
mands:
to eight groups. Only the external ports (11 through 16) can be
part of a LAG.
3750# delete flash:/config.text
3750# reload
Configuring a Cisco IOS-based Gigabit Ethernet switch
for dynamic link aggregation
To set the Cisco CatOS-based Catalyst 6509 switch to the
The following example shows the Cisco IOS-based switch CLI com-
default configuration, administrators should issue the following
mands for configuring six ports for LACP:
commands:
3750(config)# interface range GigabitEthernet
Cat_6509 (enable) clear config all
1/0/1 - 6
3750(config-if)# channel-protocol lacp
Please see the “Configuration limitations” section in this article
3750(config-if)# channel-group 1 mode active
for scenarios in which resetting the switches to factory defaults
would be impractical.
The first command sets the CLI mode to configure six Gigabit
The Dell PowerConnect 5316M can support up to eight LAGs.
Ethernet ports (referred to in the command as GigabitEthernet
A port channel can have from zero to six of the external ports as
1/0/1 – 6, which represents Gigabit Ethernet ports 1 through 6).
members. Internal ports cannot be members of a LAG. The examples
The second command sets ports to use LACP as the LAG protocol
in this article use different numbers of ports in a LAG.
(and not PAgP). The third command aggregates the six ports into
Best practices recommend that the ports to be aggregated on
a LAG (referred to in the command as channel-group), which
both the Cisco and Dell switches be disconnected during configu-
will use LACP (referred to in the command as mode active). The
ration. This will avoid any network loops being formed before the
channel-group number, which is 1 in this example, has mean-
LAG is set up.
ing only within the switch and is used to differentiate unique
channel-groups.
Configuring the PowerConnect 5316M external ports
for dynamic link aggregation
The following example shows the Dell PowerConnect 5316M CLI
Configuring a Cisco CatOS-based Gigabit Ethernet switch
for dynamic link aggregation
commands for configuring the six external ports on the Gigabit
The following example shows the Cisco CatOS-based switch CLI
Ethernet switch for LACP:
commands for configuring six ports for LACP:
5316M(config)# interface range ethernet g11-16
Cat_6509(enable) set channelprotocol lacp 2
5316M(config-if)# channel-group 1 mode auto
Cat_6509(enable) set port lacp-channel 2/1-6
mode active
104
DELL POWER SOLUTIONS
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February 2006
NETWORK AND COMMUNICATIONS
that the Cisco CatOS-based switch has established a LAG and
5316M# show interfaces port-channel 1
Channel
Ports
.......
.....
ch1
Active: g(11-16)
that the LAG is connected. The output of this command shows
that the status of ports 2/1 through 2/6 is “connected” and
the channel mode of these ports is “active.” This confirms that
there is physical link on all ports in the LAG and that the Cisco
switch has communicated with the PowerConnect 5316M switch
Figure 1. Using the show interfaces command to confirm a LAG connection for the
Dell PowerConnect 5316M
to successfully establish an aggregated link on ports 2/1 through
2/6 with LACP.
module 2 (in this example, this module in the switch is used to vali-
Configuring the PowerConnect 5316M external ports
for static link aggregation
date the examples in this article; other switches may be configured
The following example shows the Dell PowerConnect 5316M CLI
differently). The second command aggregates six ports on module 2
commands for configuring three external ports of the Gigabit Eth-
(referred to in the command as 2/1–6, which represents ports 1
ernet switch for static aggregation:
The first command sets the LAG dynamic protocol to LACP on
through 6 on module 2) into a LAG (referred to in the command as
lacp-channel), which will use LACP (referred to in the command
5316M(config)# interface range ethernet g13-15
as mode active).
5316M(config-if)# channel-group 1 mode on
Note: Only the “active” Cisco mode is supported for LACP
interoperability with the Dell PowerConnect 5316M. The other
Note that a LAG can be configured with zero to six ports (this
modes (“passive,” “auto,” “on,” and “desirable”) should not
example uses three ports), but a port can be part of only a single
be used when using LACP between a Cisco switch and the
LAG. The first command sets the CLI mode to configure three exter-
PowerConnect 5316M. This is a common configuration error.
nal Gigabit Ethernet ports (13 through 15). The second command
aggregates the three ports into a static LAG. Static LAGs do not use
Confirming a successful dynamic link aggregation
connection with the PowerConnect 5316M
LACP and are defined in the CLI by setting the channel-group mode
to “on.” The channel-group number, which is 1 in this example,
Figure 1 provides an example usage of the show interfaces
command, which can be issued to help ensure that the Dell
PowerConnect 5316M switch has established a LAG and that the
LAG is connected. The output of this command shows that ports
11 through 16 are active. This confirms that there is physical link
3750# show interfaces port-channel 1 etherchannel
Port-channel1
(Primary aggregator)
Age of the Port-channel
= 00d:01h:11m:34s
on all ports in the LAG and that the PowerConnect 5316M has
Logical slot/port
= 10/1
communicated with the Cisco switch to successfully establish an
Number of ports
= 6
aggregated link on ports 11 through 16 with LACP.
HotStandBy port
= null
Port state
= Port-channel Ag-Inuse
Confirming a successful dynamic link aggregation
connection with Cisco IOS
Protocol
= LACP
Figure 2 provides an example of the Cisco IOS show interfaces
Ports in the Port-channel:
command, which can be used to help ensure that the Cisco IOSbased switch has established a LAG and that the LAG is connected.
The output of this command shows that ports 1/0/1 through 1/0/6
Index
Load
Port
EC state
No of bits
------+------+---------+------------+-----------0
00
Gi1/0/1
Active
0
00
Gi1/0/2
Active
0
0
00
Gi1/0/3
Active
0
PowerConnect 5316M switch to successfully establish an aggregated
0
00
Gi1/0/4
Active
0
link on ports 1/0/1 through 1/0/6 with LACP.
0
00
Gi1/0/5
Active
0
0
00
Gi1/0/6
Active
0
are active. This confirms that there is physical link on all ports in
the LAG and that the Cisco switch has communicated with the
0
Confirming a successful dynamic link aggregation
connection with Cisco CatOS
Figure 3 provides an example usage of the Cisco CatOS show
lacp-channel info command, which can be used to help ensure
www.dell.com/powersolutions
Figure 2. Using the show interfaces command to confirm a LAG connection for a
Cisco IOS-based switch
Reprinted from Dell Power Solutions, February 2006. Copyright © 2006 Dell Inc. All rights reserved.
DELL POWER SOLUTIONS
105
NETWORK AND COMMUNICATIONS
The first command sets module 2 to use the LACP
Cat_6509> (enable) show lacp-channel info
Chan Port
Status
Speed
Duplex
Vlan
---- ----- ---------- --------- -----
-----
------
----
801
2/1
connected
active
395
a-1Gb
a-full
1
801
2/2
connected
active
395
a-1Gb
a-full
1
801
2/3
connected
active
395
a-1Gb
a-full
1
801
2/4
connected
active
395
a-1Gb
a-full
1
The following example shows the Cisco CatOS CLI
id
Channel
Admin
mode
group
commands to configure LAGs. Because a static LAG is
being defined, the setting for the channelprotocol command does not matter. The second command configures
the three Ethernet ports (2/9 through 2/11) into a static
LAG. Static LAGs do not use LACP and are defined in the
Cisco CLI by setting the lacp-channel mode to “on.”
801
2/5
connected
active
395
a-1Gb
a-full
1
PAgP channelprotocol commands for configuring three
801
2/6
connected
active
395
a-1Gb
a-full
1
ports of the Cisco switch for static link aggregation using
the PAgP command:
. . .
Cat_6509(enable) set channelprotocol pagp 2
Figure 3. Using the show lacp-channel info command to confirm a LAG connection for a Cisco
CatOS-based switch
Cat_6509(enable) set port channel 2/9-11
mode on
has meaning only within the switch and is used to differentiate up
The first command sets module 2 to use the PaGP com-
to eight unique channel-groups. For each LAG created, administra-
mands to configure LAGs. As mentioned before, the setting for the
tors must designate it with a number between one and eight for
channelprotocol command does not matter because a static
up to eight groups. The internal ports that connect to the servers
LAG is being defined. The second command configures the three
do not support LAGs.
Ethernet ports (2/9 through 2/11) into a static LAG. Static LAGs
do not use PAgP and are defined in the Cisco CLI by setting the
Configuring a Cisco IOS-based switch for static link aggregation
channel mode to “on.”
The following example shows the Cisco IOS CLI commands
for configuring three ports of the Cisco switch for static link
Confirming a successful static link aggregation connection
aggregation:
When LACP is not being used, only careful inspection of the Cisco
and PowerConnect 5316M configurations can confirm that a static
3750(config)# interface range GigabitEthernet
LAG has been established. Administrators can take the following
steps to help confirm the connection:
1/0/9 - 11
3750(config-if)# channel-group 1 mode on
1. Check that the cabling is connected to the correct ports on
The first command sets the CLI mode to configure three Gigabit
Ethernet ports (1/0/9 through 1/0/11). The second command
aggregates the three ports into a static LAG. Static LAGs do not
both switches.
2. Check that all the LAG ports have a link.
3. Use the show running-config command to confirm that the
use LACP and are defined in the Cisco CLI by setting the channel-
desired ports are in the LAG:
group mode to “on.” The channel-group number, which is 1 in
•
PowerConnect 5316M: 5316M# show running-config
this example, has meaning only within the switch and is used to
•
Catalyst 3750: 3750# show running-config
differentiate channel-groups. The number of channel-groups sup-
•
Catalyst 6509: Cat_6509(enable) show running-config
ported by Cisco switches depends on the switch model.
Link aggregation with Cisco Fast Ethernet switches
Configuring a Cisco CatOS-based switch for static link
aggregation
Some enterprise IT organizations use Cisco Fast Ethernet (100 Mbps)
The Cisco CatOS CLI allows the configuration of static LAGs via
expenses to replace the Cisco Fast Ethernet switches to match the
LACP or PAgP commands. The following example shows the Cisco
high speed of the Dell PowerConnect 5316M Gigabit Ethernet switch,
CatOS CLI LACP channelprotocol commands for configuring three
but they probably still want to achieve the most bandwidth possible.
ports of the Cisco switch for static link aggregation:
Because the PowerConnect 5316M switch supports auto-negotiation,
network switches. In this case, they may not want to incur the
administrators do not need to perform any additional steps to connect
106
Cat_6509(enable) set channelprotocol lacp 2
aggregated links to a Cisco Fast Ethernet switch if the Cisco switch’s
Cat_6509(enable) set port lacp-channel 2/9-11 mode on
link aggregation ports are also set to auto-negotiation.
DELL POWER SOLUTIONS
Reprinted from Dell Power Solutions, February 2006. Copyright © 2006 Dell Inc. All rights reserved.
February 2006
NETWORK AND COMMUNICATIONS
The ports in a Dell PowerConnect 5316M LAG are set to autonegotiation by default. If the negotiation setting of the LAG has been
Administrators can use the following commands to set the ports
on the Cisco IOS-based switch to 100 Mbps and full duplex:
changed because of a previous switch configuration, administrators can use the following command to set the LAG ports back to
2950(config)# interface range FastEthernet 0/1 - 3
auto-negotiation:
2950(config-if)# speed 100
2950(config-if)# duplex full
5316M(config)# interface port-channel 1
Administrators can use the following commands to set
5316M(config-if)# negotiation
the ports on the Cisco CatOS-based switch to 100 Mbps and
To set the ports on a Cisco IOS-based switch to auto-negotiation,
full duplex:
administrators can use the following commands:
Cat_6509> (enable) set port speed 2/9-11 100
2950(config)# interface range FastEthernet 0/1 - 3
Cat_6509> (enable) set port duplex 2/9-11 full
2950(config-if)# speed auto
Configuration limitations
2950(config-if)# duplex auto
Ports to be aggregated must be configured so that they are comTo set the ports on a Cisco CatOS-based switch to auto-negotiation,
administrators can use the following command:
patible with the link aggregation feature and with the switch to
which they will be connected. For the Dell PowerConnect 5316M,
the following limitations apply to aggregated ports (the commands
Cat_6509> (enable) set port speed
2/9-11
auto
to remove the configuration are shown immediately after each
limitation):
If auto-negotiation cannot be used, both the Dell PowerConnect
LAG and the Cisco switch ports in the LAG must be set to the same
•
The port cannot have an IP address defined on it:
speed and duplex. Intermittent link failures may occur if one switch
5316M(config)# interface Ethernet g11
is in auto-negotiation mode and the other is forced to a certain
5316M(config-if)# no ip address
speed and duplex.
The Dell PowerConnect 5316M LAG can be forced to 100 Mbps
•
with the following commands:
The port cannot belong to another LAG:
5316M(config)# interface Ethernet g11
5316M(config-if)# no channel-group
5316M(config)# interface port-channel 1
5316M(config-if)# no negotiation
•
5316M(config-if)# speed 100
The port cannot be a mirrored port:
5316M(config)# interface Ethernet g11
5316M(config-if)# no port monitor gxx
In this example, the LAG is referred to in the command as
port-channel
1 . The no
negotiation command means
•
The port cannot have GARP (Generic Attributes Registration
that there is no auto-negotiation on the ports in the LAG. The
Protocol) VLAN (virtual LAN) Registration Protocol (GVRP)
speed 100 command specifies all the ports in the LAG to be 100
enabled:
Mbps. Because this is a LAG configuration, and the 802.3ad stan-
5316M(config)# interface Ethernet g11
dard requires all ports in a LAG to be full duplex, administrator do
5316M(config-if)# no gvrp enable
not need to set the duplex to full (and in fact, cannot do so via
the PowerConnect 5316M CLI). The duplex is set to full by default
•
on LAG ports.
The port cannot belong to an access VLAN other than the
default VLAN (1):
Note: This process differs from the Cisco IOS and CatOS
5316M(config)# interface Ethernet g11
methods, which require that all the ports in the LAG be config-
5316M(config-if)# no switchport access vlan
ured to 100 Mbps and full duplex rather than setting the LAG to
100 Mbps. Configuring all ports in a LAG to 100 Mbps and full
•
The port cannot belong to a trunk VLAN other than the
duplex on the Dell PowerConnect 5316M switch would have no
default VLAN (1):
effect because the LAG configuration takes precedence over indi-
5316M(config)# interface Ethernet g11
vidual port configurations.
5316M(config-if)# no switchport trunk native vlan
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DELL POWER SOLUTIONS
107
NETWORK AND COMMUNICATIONS
shows that port g11 is actually set to 100 Mbps (and not 10 Mbps)
5316M(config-if)# exit
because the LAG is set to 100 Mbps. If g11 is removed from the
5316M(config)# exit
LAG, the port configuration will be applied (that is, g11 would
5316M# show running-config
be set to 10 Mbps).
interface range ethernet g(13-16)
On Cisco IOS- and CatOS-based switches, ports must be config-
channel-group 1 mode on
ured identically to be included in a LAG. Cisco IOS-based switches
exit
can use the “desirable” and “passive” mode options for the LAG
interface ethernet g11
setting. The PowerConnect 5316M does not support this implemen-
gvrp enable
tation, and thus administrators should not use these modes when
exit
configuring a LAG with a Dell PowerConnect switch. Instead, they
should use only the “active” mode (for LACP configuration) or the
“on” mode (for static configuration).
Figure 4. Example output for the show running-config command showing GVRP enabled
Switches can control the distribution only of outgoing traffic
on LAG ports. The PowerConnect 5316M uses a static distribution
method based on source and destination Media Access Control
5316M# show running-config
(MAC) addresses to decide which port or LAG a packet will
interface port-channel 1
travel through.4
speed 100
Cisco IOS- and CatOS-based switches provide configuration
no negotiation
exit
options for changing the distribution of traffic on LAG ports. The
interface ethernet g11
Cisco IOS commands shown in Figure 6 can be used if the Cisco
speed 10
IOS-based switch performs poorly in the LAG. These commands
no negotiation
allow administrators to configure the switch to distribute pack-
exit
ets to ports in a LAG based on the following settings: destina-
interface range ethernet g(11,13-16)
tion IP address, destination Ethernet address, a combination of
channel-group 1 mode on
source and destination IP addresses, a combination of source
exit
and destination Ethernet addresses, source IP address, or source
Ethernet address.
The Cisco CatOS commands shown in Figure 7 can be used if
Figure 5. Example output for the show running-config command showing differing
LAG and port speeds
the Cisco CatOS-based switch performs poorly in the LAG. These
commands allow administrators to configure the switch to distribute packets to ports in a LAG based on the following settings:
• The internal switch ports (g1 through g10) cannot be part of
destination IP address, destination Ethernet address, a combination
a LAG. The CLI will prevent adding internal ports to a LAG.
of source and destination IP addresses, a combination of source
and destination Ethernet addresses, source IP address, or source
To check the configuration of the ports on the PowerConnect
Ethernet address.
5316M, administrators can use the show running-config command
and view the interface Ethernet gxx configurations, where xx
indicates the port number. Figure 4 shows example output after this
3750(config)#port-channel load-balance dst-ip
command has been issued. In this scenario, the no gvrp enable
3750(config)#port-channel load-balance dst-mac
command would have to be issued on port g11 before this port
3750(config)#port-channel load-balance src-dst-ip
could be added to a LAG.
3750(config)#port-channel load-balance src-dst-mac
3750(config)#port-channel load-balance src-ip
Cisco and Dell port configuration differences
3750(config)#port-channel load-balance src-mac
On the Dell PowerConnect 5316M, configurations for the LAG
take precedence over the configuration of the ports. In Figure 5,
example output from the show running-config command
Figure 6. Cisco IOS commands for configuring packet distribution in a LAG
4 For an in-depth discussion of this algorithm and network design considerations, see “Network Link Aggregation Practices with the Dell PowerEdge 1855 Blade Server” by Bruce Holmes in Dell Power Solutions, May 2005;
www.dell.com/downloads/global/power/ps2q05-20040286-Holmes-OE.pdf.
108
DELL POWER SOLUTIONS
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February 2006
NETWORK AND COMMUNICATIONS
Cat_6509> (enable) set port channel all distribution ip destination
Cat_6509> (enable) set port channel all distribution mac destination
Cat_6509> (enable) set port channel all distribution ip both
Cat_6509> (enable) set port channel all distribution mac both
Cat_6509> (enable) set port channel all distribution ip source
Cat_6509> (enable) set port channel all distribution mac source
Figure 7. Cisco CatOS commands for configuring packet distribution in a LAG
Interoperability between Dell
and Cisco switches
in all phases of product development and testing. He has a B.S. in Electrical Engineering from The University of Texas at Austin.
The standards-based link aggregation feature of the Dell PowerConnect
5316M Gigabit Ethernet switch is designed to interoperate easily
with Cisco IOS- and CatOS-based switches. By understanding the
differences in the Dell PowerConnect 5316M and Cisco CLIs and
building on the examples presented in this article, system administrators can help integrate the PowerConnect 5316M switch into
their Cisco-based networks.
Bruce Holmes is a senior test engineer in the Dell PowerConnect Group.
He has worked at Dell for two years and supports PowerConnect switches
www.dell.com/powersolutions
F OR M ORE INF ORM ATION
Holmes, Bruce. “Network Link Aggregation Practices with the
Dell PowerEdge 1855 Blade Server.” Dell Power Solutions,
May 2005. www.dell.com/downloads/global/power/
ps2q05-20040286-Holmes-OE.pdf
Dell PowerConnect 5316M Ethernet Switch Module
User’s Guide:
support.dell.com/support/edocs/network/PC5316M/en/UG
Reprinted from Dell Power Solutions, February 2006. Copyright © 2006 Dell Inc. All rights reserved.
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