TYPICAL SM-2400 APPLICATION
- What is a Bypass Switch?
A Bypass Switch
is designed for the sole purpose of maintaining connectivity and integrity
within a network that utilizes Transparent Network Appliances such as a
Intrusion Protection Device. When such a network device or appliance fails, it
can bring down portions of, or your entire network. A better scenario would be
to have that device become automatically isolated from the network, in essence
"bypassed", so the normal operation of the network can be maintained. By
installing a SM-240X Series Bypass Switch, an appliance failure can be
detected by the SM-240X causing the device to be bypassed and allowing the
flow of traffic to continue uninterrupted.
- Why do I need a Bypass
High-availability and speed are key to running a successful network.
Appliances such as Intrusion Protection Systems allow for greater protection
and a much faster transfer of data when placed inline. But what does that
device do to your reliability quotient? Are you not adding a single
point of failure? While many of these products contain a certain amount of
resiliency, they still, in certain scenarios, are a single point of failure.
With a Shore Microsystems Programmable Bypass Switch installed with a Cisco
4200 Series IPS, you can automatically bypass a problem device and maintain
- How does it work?
The SM-240X is a
unique hardware device that can be used to "Bypass" a network appliance such
as a Cisco 4200 Series IPS appliance. Incorporated into this bypass device is
the same reliable relay switching technology implemented in the Shore
Microsystems Series 25 Ethernet Link Protectors since 1994. The SM-240X has
four RJ45 connections for each protected appliance. The SM-240X will allow the
flow of traffic to be passed to and from a healthy network appliance. When the
appliance fails, the traffic will flow will directly from network device to
network device and "bypass" the appliance (see above diagram).
How does it decide to switch to bypass?
The SM-240X will
switch by detecting a loss of link. By constantly monitoring the IPS's
link signals, the SM-240X can automatically and immediately switch to the
Bypass mode on loss of link.
the Bypass Switch reliable?
Microsystems has been designing fault tolerant technology since 1994 and has
incorporated its "Straight Through Wire"TM
Technology into the SM-240X Series of Programmable Bypass Switches. This
allows the Bypass Switch to become completely transparent to the network, as
if it were wire only, and thereby not causing any failure or network downtime.
- How is the Bypass Switch
Power may be provided either by
the appliance itself for internally mounted units, or an external 12V-power
supply for the single port stand-alone unit. Multi-port units contain
dual redundant 110/220V AC power supplies.
Which Bypass Switch is right for my application?
Choosing a Bypass device is a
function of both form and functionality. A Bypass device should never be a
single point of failure, and be compatible with the appliance you have chosen
for your network. Using an external device allows you to take the appliance
out of service for repair without any connectivity loss while an internal
bypass card saves space. Multiple port external units also save space while
providing bypass functionality for multiple appliance interfaces.