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10/100/1000 Bypass Switch with Heartbeat
Power Loss Bypass
The 10/100/1000 Bypass Switch protects link integrity when the attached
in-line device loses power. To install the 10/100/1000 Bypass Switch for this
type of protection, the switch should share the same power source as the in-
line appliance. If you are using redundant power supplies for the switch, make
sure that both are connected to the same power source as the in-line device.
Heartbeat Bypass
The 10/100/1000 Bypass Switch with Heartbeat protects against both physical
link failure and application failure on the in-line appliance. The switch checks
the path through the in-line appliance by sending a packet every second from
Monitor Port C. The switch validates the path when it receives the packet on
the Monitor Port D. If the switch does not receive the packet as expected three
times in a row (default setting), the switch automatically enter Bypass Enabled
mode. You can change the number of the heartbeat packets required before the
bypass switch enters Bypass Enabled mode from the bypass switch CLI (see
Conguring the Bypass Switch on page 6).
Below is the default heartbeat packet sent once every second from the Moni-
tor Port C. You can change the default timing of the heartbeat packet and the
heartbeat packet from the bypass switch CLI (see Conguring the Bypass
Switch on page 6).
Packet Contents (Hex) Description
----------------------------- ----------------
00 50 C2 3C 60 00 MAC DA Net Optics
00 50 C2 3C 60 01 MAC SA Net Optics
81 37 Packet Type IPX
FF FF 00 30 00 00 00 00
40 04 EC A2 C6 13 01 02
C6 13 01 01 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00
82 A2 BA 71 CRC
The switch continues to send the heartbeat packet and will return to Bypass
Disabled mode as soon as it receives heartbeat packets on Monitor Port D.
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