Net Optics 4 Station Bypass Switch w_Heartbeat - Manual (Page 9)

5
4 Station Bypass Switch with Heartbeat
Heartbeat Bypass per Segment
The 4 Station 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 1. The bypass switch validates the path when it receives the
packet on the Monitor Port 2. If the bypass switch does not receive the packet
as expected three times in a row, the bypass switch automatically enters By-
pass Enabled (ON) mode.You can change the number of the heartbeat packets
required before the bypass switch enters Bypass Enabled mode from the CLI
(see Configuring the Bypass Switch on page 6).
Below is the default IPX heartbeat packet sent once every second from the
Monitor Port 1. You can change the default timing of the heartbeat packet and
the heartbeat packet from the CLI (see Configuring 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 when it receives three consecutive packets on Monitor Port D.