Linkage aggregation

WhitePaper
Link Aggregation according to
IEEE Standard 802.3ad

Link Aggregation according to IEEE 802.3ad
Link Aggregation according to
IEEE 802.3ad
Copyright Ó SysKonnect GmbH, 2002. All rights reserved.
All brand and product names are trademarks or registered trademarks of their respective
holders. Contents are subject to change.
English
(v1.10 10-Oct-2002)
About SysKonnect and Marvell:
SysKonnect focuses on the worldwide development, manufacture, and marketing of high-
end adapter boards for computer and telecom networks. SysKonnect products include both
high-performance fiber- and copper-based network interface cards (NICs) for Gigabit-
Ethernet systems, as well as FDDI/CDDI and FDDI concentrators for strategic networks. The
Company’s comprehensive line of SK-NET NICs is ideally suited to secure-server-based
public- and private-sector computing environments, such as electronic commerce, finance,
healthcare, imaging, and other bandwidth-intensive applications, as well as to enterprise
systems developed by SAP and Baan.
SysKonnect maintains offices in Great Britain and the USA.
Visit www.syskonnect.com.
SysKonnect is a subsidiary of Marvell Technology Group Ltd. (NASDAQ: MRVL). Marvell is
the leading global semiconductor provider of complete broadband communications solutions
for the data communications and storage markets. The Company’s diverse product portfolio
includes switching, transceiver, communications controller, wireless, and storage solutions
that power the entire communications infrastructure, including enterprise, metro, home, and
storage networking. As used in this release, the terms “Company” and “Marvell” refer to Mar-
vell Technology Group Ltd. and its subsidiaries, including Marvell Semiconductor, Inc. (MSI),
Marvell Asia Pte Ltd (MAPL), Marvell Japan K.K., Marvell Taiwan Ltd., Marvell International
Ltd. (MIL), Galileo Technology Ltd., and SysKonnect GmbH. MSI is headquartered in
Sunnyvale, CA and designs, develops, and markets products on behalf of MIL and MAPL.
MSI may be contacted at 408-222-2500 or at www.marvell.com.

Table of Contents
1 Why Link Aggregation? 5
Higher Link Availability 5
Increased Link Capacity 5
Aggregating replaces Upgrading 5
2 Types of Link Aggregation 7
Switch-to-Switch Connections 7
Switch-to-Station (Server or Router) Connections 8
Station-to-Station Connections 9
3 The IEEE Standard 802.3ad 11
4 Configuration 13
Physical issues in Link Aggregation 13
Addressing 13
Distribution of Frames 13
Technology Constraints 13
SysKonnect solution for Link Aggregation with Gigabit Ethernet 14
Link Aggregation Control Protocol (LACP) 14
Creation of aggregators and teams 14
Redundant Switch Failover 15
SysKonnect Network Control for Windows 2000 17
5 Conclusion 21

1 Why Link Aggregation?
Link Aggregation or trunking is a method of combining physical network links into a single
logical link for increased bandwidth. With Link aggregation we are able to increase the ca-
pacity and availability of the communications channel between devices (both switches and
end stations) using existing Fast Ethernet and Gigabit Ethernet technology. Two or more Gi-
gabit Ethernet connections are combined in order to increase the bandwidth capability and to
create resilient and redundant links. A set of multiple parallel physical links between two de-
vices is grouped together to form a single logical link.
Link Aggregation also provides load balancing where the processing and communications
activity is distributed across several links in a trunk so that no single link is overwhelmed.
By taking multiple LAN connections and treating them as a unified, aggregated link, we can
achieve practical benefits in many applications.
Link Aggregation provides the following important benefits:
· Higher link availability
· Increased link capacity
· Improvements are obtained using existing hardware (no upgrading to higher-capacity
link technology is necessary)
Higher Link Availability
Link aggregation prevents the failure of any single component link from leading to a disrup-
tion of the communications between the interconnected devices. The loss of a link within an
aggregation reduces the available capacity but the connection is maintained and the data
flow is not interrupted.
Increased Link Capacity
The performance is improved because the capacity of an aggregated link is higher than each
individual link alone.
Standard LAN technology provides data rates of 10 Mb/s, 100 Mb/s, and 1000 Mb/s. Link
Aggregation can fill the gaps of these available data rates when an intermediate perform-
ance level is more appropriate; a factor of 10 increase may be overkill in some environ-
ments.
If a higher capacity than 1000 Mb/s is needed, the user can group several SysKonnect
1000 Mb/s adapters together to form a high speed connection and additionally benefit from
the failover function the SysKonnect driver for Link Aggregation supports. This provides mi-
gration to 10 Gigabit Ethernet solutions which are not yet available.
Aggregating replaces Upgrading
If the link capacity is to be increased, there are usually two possibilities: either upgrade the
native link capacity or use an aggregate of two or more lower-speed links (if provided by the
card’s manufacturer). Upgrades typically occur in factors of 10. In many cases, however, the
device cannot take advantage of this increase. A performance improvement of 1:10 is not
achieved, moreover the bottleneck is just moved from the network link to some other ele-
ment within the device. Thus, the performance will always be limited by the weakest link, the
end-to-end connection.

6 1 Why Link Aggregation?
Link aggregation may be less expensive than a native speed upgrade and yet achieve a
similar performance level. Both the hardware costs for a higher speed link and the equivalent
number of lower speed connections have to be balanced to decide which approach is the
most advantageous.
Sometimes link aggregation may even be the only means to improve performance when the
highest data rate available on the market is not sufficient.
Many network administrators have experienced that upgrading the network hardware (e.g.,
switching from 10 Mb/s network adapters to 100 Mb/s network adapters), in the end, led to a
performance improvement much less than the 10:1 ratio implied by the hardware change (or
perhaps no improvement at all!).
Whether an aggregated link actually yields a performance improvement commensurate with
the number of links provided depends to a great extent on network traffic patterns and the
algorithm used by the devices to distribute frames among aggregated links. To the extent
that traffic can be distributed uniformly across the links, the effective capacity will increase as
desired. If the traffic and distribution algorithm is such that a few links carry the bulk of the
traffic while others go nearly idle, the improvement will be less than anticipated.

2 Types of Link Aggregation
There are a number of situations where Link Aggregation is commonly deployed:
· Switch-to-switch connections
· Switch-to-station (server or router) connections
· Station-to-station connections
The following figure shows the different uses.
Figure 1. Aggregated links
Switch-to-Switch Connections
In this scenario, multiple workgroups are joined to form one aggregated link. By aggregating
multiple links, the higher speed connections can be achieved without hardware upgrade.
Example In Figure 2, two switches are shown which are connected using four 1000 Mb/s links. If one
link fails between these two switches, the other links in the link aggregation group take over
the traffic and the connection is maintained.
Figure 2. Switch-to-switch connection

8 2 Types of Link Aggregation
This configuration reduces the number of ports available for connection to external devices.
Aggregation thus implies a trade-off between port usage and additional capacity for a given
device pair.
Switch-to-Station (Server or Router) Connec-
tions
Most server platforms can saturate a single 100 Mb/s link with many of the applications
available today. Thus, link capacity becomes the limiting factor for overall system perform-
ance.
Example In Figure 3, two servers are shown, each connected to a switch using four 100 Mb/s links. In
this application, link aggregation is used to improve performance for the link-constrained sta-
tion. By aggregating multiple links, better performance is achieved without requiring a hard-
ware upgrade to either the server or the switch. Aggregation on the server side can generally
be achieved through software changes in the device driver for the LAN interface(s).
Figure 3. Switch-to-station connection
Link Aggregation trades off port usage for effective link capacity. While it is common for high
port-density switches to have some number of excess ports, it is rare for a server to have
unused network interface cards. In addition, traditional single-port network adapters use a
server backplane slot for each interface; often a server configuration will have only a limited
number of slots available for network peripherals. In response to this problem, a number of
manufacturers offer multiport network adapters specifically for use in servers, e.g. SysKon-
nect’s Dual Link Gigabit Ethernet Adapter.
Figure 1 depicts multiple 1000 Mb/s links being aggregated between the backbone switch
and a high-performance enterprise backbone router. From the perspective of the switch, a
network layer router is simply an end station – not much different from a server. As such, we
can aggregate links between a switch and a router for the same reasons as in the switch-to-
server case. One important difference arises regarding the choice of algorithm used to dis-
tribute frames among the links.

Station-to-Station Connections 9
Station-to-Station Connections
In the case of aggregation directly between a pair of end stations, no switches are involved
at all. As in the station-to-switch case, the higher performance channel is created without
having to upgrade to higher-speed LAN hardware. In some cases, higher-speed NICs may
not even be available for a particular server platform, making link aggregation the only prac-
tical choice for improved performance.
Example Figure 4 shows two servers interconnected by an aggregation of four 1000 Mb/s links.
Figure 4. Station-to-station connection
This high-speed connection may be useful for multi-processing or server redundancy appli-
cations where high performance is needed to maintain real-time server coherence (this con-
figuration is sometimes called back-end network).

10 2 Types of Link Aggregation
This page left blank to accommodate double-sided printing.

3 The IEEE Standard 802.3ad
“Link Aggregation allows one or more links to be aggregated together to form a Link Aggre-
gation Group, such that a MAC client can treat the Link Aggregation Group as if it were a
single link” (from IEEE Standard 802.3, 2000 Edition, page 1215).
The standard lists the following main goals and objectives for Link Aggregation (from IEEE
Standard 802.3, 2000 Edition, page 1215):
· Increased bandwidth
The capacity of multiple links is combined into one logical link.
· Increased availability
The failure or replacement of a single link within a Link Aggregation Group need not
cause failure from the perspective of a MAC Client.
· Linearly incremental bandwidth
Bandwidth can be increased in unit multiples as opposed to the order-of-magnitude in-
crease available through Physical Layer technology options (10 Mb/s, 100 Mb/s,
1000 Mb/s, etc.).
· Load sharing
MAC Client traffic may be distributed across multiple links.
· Automatic configuration
In the absence of manual overrides, an appropriate set of Link Aggregation Groups is
automatically configured, and individual links are allocated to those groups.
· Rapid configuration and reconfiguration
In the event of changes in physical connectivity, Link Aggregation will quickly converge
to a new configuration, typically on the order of 1 second or less.
· Deterministic behavior
Depending on the selection algorithm chosen, the configuration can be made to resolve
deterministically; i.e. the resulting aggregation can be made independent of the order in
which events occur, and be completely determined by the capabilities of the individual
links and their physical connectivity.
· Low risk of duplication or mis-ordering of frames
During both steady-state operation and link (re-) configuration, there is a high probability
that frames are neither duplicated nor mis-ordered.
· Support of existing IEEE 802.3 MAC Clients (frames transmitted are ordinary MAC
frames)
No change is required to existing higher-layer protocols or application to use Link Ag-
gregation.
· Backwards compatibility with aggregation-unaware devices
Links that cannot take part in Link Aggregation - either because of their inherent capa-
bilities, management configuration, or the capabilities of the devices to which they attach
– operate as normal, individual IEEE 802.3 links.
· Accommodation of differing capabilities and constraints
Devices with differing hardware and software constraints on Link Aggregation are, to the
extent possible, accommodated.
· No change to the IEEE 802.3 frame format
Link Aggregation neither adds to, nor changes the contents of frames exchanged be-
tween MAC Clients.
· Network Management Support
The standard specifies appropriate management objects for configuration, monitoring,
and control of Link Aggregation.

12 3 The IEEE Standard 802.3ad
Link Aggregation, according to IEEE 802.3, does not support the following:
· Multipoint Aggregations
The mechanisms specified in this clause do not support aggregations among more than
two systems.
· Dissimilar MACs
Link Aggregation is supported only on links using the IEEE 802.3 MAC (Gigabit Ethernet
and FDDI are not supported in parallel but dissimilar PHYs such as copper and fiber are
supported)
· Half duplex operation
Link Aggregation is supported only on point-to-point links with MACs operating in full
duplex mode.
· Operation across multiple data rates
All links in a Link Aggregation Group operate at the same data rate (e.g. 10 Mb/s,
100 Mb/s, or 1000 Mb/s).

4 Configuration
Physical issues in Link Aggregation
Addressing
Each network interface controller is assigned a unique MAC address. Usually this address is
programmed into the ROM during manufacturing. During initialization, the device driver
reads the contents of the ROM and transfers the address to a register within the MAC con-
troller. In most cases, this address is used as source and destination address during the
transmission of packets. Aggregated links are to appear as a single link with a single logical
network interface and therefore only have one “virtual” MAC address. The MAC address of
one of the interfaces belonging to the aggregated link provides the “virtual” address of the
logical link.
Frame Distribution
When applying WAN technologies, frames are sometimes broken into smaller units to accel-
erate transmission (such as in the bonding of B-channel ISDN lines). LAN communications
channels, however, do not support sub-frame transfers. The complete frame has to be sent
through the same physical link. Using aggregated links, the task is to select the link on which
to transmit a given frame. Sending one long frame may take longer than sending several
short ones, so the short frames may be received earlier than one long frame. The order has
to be restored at the receiver side. Thus, an agreement has been made: all frames belonging
to one conversation must be transmitted through the same physical link, which guarantees
correct ordering at the receiving end station. For this reason no sequencing information may
be added to the frames. Traffic belonging to separate conversations can be sent through
various links in a random order. The algorithm for assigning frames to a conversation de-
pends on the application environment and the kind of devices used at each end of the link.
When a conversation is to be transferred to another link because the originally mapped link
is out of service (failed or configured out of the aggregation) or a new link has become avail-
able relieving the existing ones, precautions have to be taken to avoid mis-ordering of
frames at the receiver. This can be realized either by means of a delay time the distributor
must determine somehow or through an explicit marker protocol that searches for a marker
identifying the last frame of a conversation. The distributor inserts a “marker message” be-
hind the last frame of a conversation. After the collector receives this “marker message” it
sends a response to the distributor, which then knows, that all frames of the conversation
have been delivered. Now the distributor can send frames of these types of conversations
via a new link without delay. If the conversation is to be transferred to a new link, because
the originally mapped link failed, this method will not work. There is no path on which the
message marker can be transferred, i.e. the distributor has to employ the timeout method.
Technology Constraints
In principle, the devices applied in the aggregation restrict the throughput. Using an aggre-
gation of four 100 Mb/s links instead of one 100 Mb/s link will increase the capacity but the
throughput on each link remains the same.

14 4 Configuration
SysKonnect solution for Link Aggregation with
Gigabit Ethernet
All SysKonnect Gigabit Ethernet adapters support link aggregation according to the IEEE
standard 802.3ad. At the moment SysKonnect provides a Link Aggregation driver for Win-
dows 2000. In the future, Link Aggregation support according to IEEE 802.3ad will be im-
plemented in drivers for other operating systems such as Linux, Sun Solaris, HP-UX and
IBM AIX. The SysKonnect Link Aggregation intermediate driver for Windows 2000, which is
part of the “SysKonnect Network Driver Installation Package”, supports the possibility of
combining all ports in a system into port groups. A port group consists of one or more ports,
which are connected to the same non-segmented network. One port can not belong to more
than one port group. Every port group will behave like a single network interface to the oper-
ating system. If a port group consists of only one port, it will behave like a single link adapter.
This functional aggregation of ports enables Link Aggregation.
Link Aggregation means that multiple connections between two network instances are
treated like a single connection of higher bandwidth. It is implemented according to the stan-
dard 802.3ad. It will increase the bandwidth (assuming the system has enough resources to
process additional data) and fault tolerance of the connection.
Link Aggregation offers an efficient and low-cost solution to increase bandwidth between
server and switch. Another advantage it provides is that if a connection fails completely the
remaining links can take over the traffic and thus replace the broken line.
The SysKonnect Link Aggregation driver helps to increase the network performance by dis-
tributing the network traffic among the network adapters belonging to the same group (load
balancing). As soon as the server is contacted the driver assigns links to the diverse applica-
tions according to the network load. This way, bandwidth can be extended proportionally to
the network adapters.
All ports that are configured for Link Aggregation (at least one) can be used to transmit
and/or receive frames, depending on their configuration. If one connection fails the aggre-
gated connection will lose bandwidth but remain stable as long as at least one connection of
the group is working.
In addition, SysKonnect offers a Redundant Switch Failover mechanism (RSF). If a switch
fails completely, RSF can move the link to a different switch, which then takes over the traf-
fic.
Link Aggregation Control Protocol (LACP)
The LACP is required by the IEEE standard 802.3ad for dynamically exchanging configura-
tion information among cooperating systems in order to automatically configure and maintain
link aggregation groups. The protocol is able to automatically detect the presence and capa-
bilities of other aggregation capable devices, i.e. with LACP it is possible to specify which
links in a system can be aggregated.
Creation of aggregators and teams
The SysKonnect Link Aggregation driver uses LACP to establish link aggregation groups
between two connected devices. Each device considers itself as being an “actor” and the
device at the other end of the link as “partner”, i.e. both devices are actors and both are
partners depending on the point of view. The ports send their actor information (LACP
frames) to the other device in order to find a suitable partner to form an aggregation. LACP

compares the actor and partner information and then decides which ports can be trunked to
establish an aggregator. Aggregators are built automatically from those ports for which part-
ner information is available. Using the SysKonnect Network Control running on Windows
2000 (see below) the user can combine two or more ports to create a team. For drivers of
other operating systems, similar tools for the configuration of Link Aggregation will be avail-
able.
Teams and aggregators have the following main features:
· There is a virtual MAC address for the whole team (the MAC address of one adapter of
the team).
· The aggregator with the most active links is the active aggregator.
· Every other aggregator is in hot standby.
· The aggregators are configured automatically (see the link aggregation standard).
Below the team level, LACP automatically creates aggregators as described above. If all
ports have the same partner information, only one aggregator is established. If there are “n”
types of partner information, “n” aggregators will be created. With more than one aggregator
within a team, the redundant switch failover mechanism RSF provided by SysKonnect can
be employed. This unique feature is described in the next chapter “Redundant Switch
Failover”.
Redundant Switch Failover
Beyond the features required for Link Aggregation in the IEEE 802.3ad standard, SysKon-
nect drivers support an additional failover feature, Redundant Switch Failover (RSF). At the
moment this feature is only implemented in the driver for Windows 2000, but will be available
for other operating systems in the future. The standard requires that all links of a link aggre-
gation group are connected to the same partner. With SysKonnect’s Link Aggregation driver
one team can comprise more than one aggregator. If a team has more than one aggregator,
which are connected to separate switches, the failover feature is utilized.
The decision on which link (aggregator) data is transferred is based on the bandwidth (link
speed multiplied with number of ports). The link with the largest bandwidth is used for data
transmission. If the bandwidth of the aggregators is equal, the first aggregator of a team is
used.
In the following figure a typical system employing Link Aggregation and SysKonnect’s RSF is
depicted. Two scenarios are described in the example.

16 4 Configuration
Figure 5. Link Aggregation and RSF
Example In the above system data is normally transferred from Server A to Server B via Aggregator
A1, Switch 1, and Aggregator B1 and vice versa, i.e. Aggregators A1 and B1 are the active
links, Aggregators A2 and B2 are in hot standby.
Scenario 1: Port failure
Assume two links of Aggregator A1 fail: RSF switches the data flow of Server A to Aggrega-
tor A2, because data is always transferred on the link with the larger bandwidth. Data from
Server A to Server B is then transmitted via Aggregator A2, Switch 2, Switch 1, and Aggre-
gator B1 (is still the aggregator with the greatest bandwidth in Team of Server B) and vice
versa. In case the two links of Aggregator A1 become active again, RSF switches data
transfer back to Aggregator A1 due to the larger bandwidth.
Scenario 2: Switch failure
Assume Switch 1 fails: RSF switches the data flow from Server A to Aggregator A2 and the
data flow from Server B to Aggregator B2 because both Aggregator A1 and B1 do not have
an active link anymore. Data from Server A to Server B is then transmitted via Aggregator
A2, Switch 2, and Aggregator B2 and vice versa. When switch 1 is functional again, RSF
switches data transmission back to Aggregator A1 and B1 due to the larger bandwidth.

SysKonnect Network Control for Windows 2000
The link aggregation functionality in SysKonnect drivers is configured and controlled via the
SysKonnect Network Control, a utility program running on Windows 2000 systems. The
SysKonnect Network Control can be reached via “Start” --> “Settings” --> “Control Panel” -->
“SysKonnect Network Control”. This utility program enables the user to configure all
SysKonnect SK-98xx Gigabit Ethernet adapters installed in a system. The various tabs con-
tain tree views showing the installed adapters and their configuration. The tab “Adapter” dis-
plays the network adapters available in the system with their corresponding ports. It shows
the ports which have been configured as VLANs, for RLMT (Redundant Link Management
Technology) and the ones which have been combined to form a team.
Figure 6. Adapter Overview in SysKonnect Network Control
The corresponding tab in the SysKonnect Network Control where the user is able to config-
ure the link aggregation features is called “Team”. The “Team” tab shows all links or ports of
SysKonnect Gigabit Ethernet adapters which are available for teaming or have been already
grouped to form a team.
Figure 7. Available ports for teaming

18 4 Configuration
In this tab the user is able to create teams, add ports to teams, remove teams, and rename
teams. After a new team has been created the user can add ports to this team. If a port from
this team has found a partner on the other end of the connection, which is suitable for link
aggregation, a message is displayed next to the corresponding port (see Figure 8).
Figure 8. 802.3ad partner found
If a team is selected, the corresponding parameters are displayed below the tree view. The
following parameters can be viewed:
Parameter Values Description
IP Address xxx.xxx.xxx.xxx
(decimal)
Unique 32-bit (4 bytes) address of an end station within a
TCP/IP network. The IP address can not be defined in the
SysKonnect Network Control.
Maximum Frame
Size
12..9014 This parameter specifies the maximum frame size in bytes
the driver will support. The performance of the network
usually increases if a large packet size is used. Do not use
values larger than 1514 if you are not sure whether or not
your network supports jumbo frames.
If VLAN is configured the actual frame size on the port is
always 4 Bytes larger than the configured frame size of
the VLAN because the VLAN tag is inserted into the
frame.
The Maximum Frame Size can be defined in the SysKon-
nect Network Control.
Maximum Multi-
cast
0..10000 This option specifies the maximum number of multicast
addresses the driver accepts.
The Maximum Multicast can be defined in the SysKonnect
Network Control.
If a port, which is part of a team, is selected, the following additional link aggregation pa-
rameters are displayed among others (see Figure 9):
Parameter Values Description
Link Status Link up
Link down
This parameter indicates whether the port has an active
link (up) or is inactive (down).
The status of this parameter is delivered by the network
driver.
Link Aggregation
Status
802.3ad partner
found
no partner found
This parameter indicates whether the port has found an
802.3ad partner with which it can form a team.
The status of this parameter is delivered by the network
driver.
Switch member-
ship
e.g. sw1, sw2, sw3,
...
This parameter shows to which switch the port is con-
nected physically.
The information for this parameter is delivered by the net-
work driver. It can only be changed, if you physically con-
nect the port to a different switch.
Failover Status active standby This parameter indicates whether the port is active or in
standby mode to take over in case the active link fails.

Figure 9. Port parameters of port belonging to a team

20 4 Configuration
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5 Conclusion
SysKonnect’ s solution for Link Aggregation offers two main features which are essential for
every network administrator: it provides increased capacity and a fail safe system. By em-
ploying Link Aggregation the costs for upgrading the performance and the resiliency of a
system can be kept reasonable because both benefits can be attained using existing hard-
ware. By using the automatic configuration protocol LACP we can provide redundancy with
automatic switching to the standby link in case the active link fails.
The SysKonnect driver enables load balancing not only on the basis of MAC address infor-
mation but also on the basis of IP, TCP, and UDP information.
Higher throughput by aggregating multiple links is possible with existing hardware. No addi-
tional network adapters have to be purchased. The benefits of Link Aggregation can be
reached with the SysKonnect Network Driver Installation Package for Windows 2000. The
package contains the Miniport driver, the Virtual LAN (VLAN) intermediate driver, the Link
Aggregation (LAGG) intermediate driver and the configuration utility SysKonnect Network
Control and is available for free download for SysKonnect customers on our web site:
www.syskonnect.com.
Demanding applications running in high-performance environments like servers in enter-
prises, web servers, and intranet servers gain particularly from the high-bandwidth and du-
plex capabilities of Link Aggregation.
The SysKonnect implementation of Link Aggregation also provides a perfect solution on the
road to the migration to 10 Gigabit Ethernet which will be integrated in the future. The user
can fill the capacity gap by employing for example four 1000 Mb/s adapters in a team and
also gets the benefit of a failsafe system by making use of the Redundant Switch Failover
mechanism the SysKonnect driver provides.

Headquarters
SysKonnect GmbH
A Marvell®Company
Siemensstrasse 23
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Germany
Phone:
Support:
Fax:
+ 49 7243 502 100
+ 49 7243 502 330
+ 49 7243 502 989
E-mail: sales@syskonnect.deVisit our web site
www.syskonnect.com
Americas, Canada,
and Pacific Rim
SysKonnect, Inc.
1922 Zanker Road
San Jose, CA 95112
A Marvell®Company
USA
Sales:
Support:
Fax:
+ 1 800 716 3334
+ 1 408 222 0809
+ 1 866 782 2507
+ 1 408 222 0666
+ 1 408 752 9040
E-mail: info@syskonnect.com
Europe, Middle East,
and Africa
SysKonnect Ltd.
55 Henley Drive
Frimley Green, Camberley
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A Marvell®Company
United Kingdom
Phone:
Fax:
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E-mail: sales-uk@syskonnect.de

Linkage aggregation

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