Comtech EF Data DTMX5000 SpectraCast - Manual (Page 171)

DTMX5000 IP Satellite Gateway High Availability Server
Rev. 1 C–3
C.3 Detailed Description
C.3.1 System Details
•
The system serves multiple active and stand-by Gateways / INAs.
•
Any one of the stand-by Gateways / INAs can replace an active Gateway / INA.
•
Any combination between active and stand-by units is supported.
•
Each Gateway / INA (active and stand-by) has fixed IP address on the C&M
LAN.
•
Only active Gateways / INAs have IP address on the date LAN. When a stand-
by Gateway / INA replaces an active Gateway / INA, it gets the data LAN IP
address of the active Gateway / INA it replaced.
•
The HAS-2000 does health monitoring to the active and stand-by Gateways /
INAs by sending a proprietary IP TEST packet in a fixed time period.
•
The TEST packet commands the Gateway / INA to perform a sanity check. The
result of the sanity check can get one of two values – “O.K.” or “Not O.K.”. The
sanity check result is send by a trap back to the HAS-2000. The HAS-2000
decides to switch over in two cases:
♦
No trap was recieved from the tested Gateway / INA within a fixed time
window.
♦
A “Not O.K.” trap was received from a tested Gateway / INA.
•
The HAS-2000 holds mirror database for of each active Gateway / INA. An
active Gateway/INA updates the HAS-2000 each time its database is changed by
sending an SNMP trap. The database is designed to be generic, in a way it would
not be affected by new Gateway/INA parameters. The mirror database can be
stored in the HAS-2000 or in another network element (for example – the SNMP
management station).
•
The HAS-2000 can be controlled via SNMP or GUI application since it includes
a proprietary MIB.