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Chapter 6 OAM (IEEE802.3ah) function
6.1 Overview
GVM-1101 / GVM-1220 / GVM-1000 supports four kinds of standard OAM functions: Discovery of OAM, MIB
variable response, OAM loopback, Dying Gasp alarm
6.2 Discovery of OAM
When GVM-1101 / GVM-1220 / GVM-1000 is connected with the initiative device that can support 803.3ah,
GVM-1101 / GVM-1220 / GVM-1000 will wait for OAM initiative device to initiate OAM discovery Process. After OAM
is discovered, other OAM functions can be realized.
6.3 MIB Variable response
GVM-1101 / GVM-1220 / GVM-1000 supports MIB variable response processed by switch chips, which is a
subset of standard MIB. GVM-1101 / GVM-1220 / GVM-1000 responses only to requests of the initiative device,
if the requesting object is MIB information that GVM-1101 / GVM-1220 / GVM-1000
doesn’t have, MIB variable
response will return a null instruction.
6.4 OAM Loopback
GVM-1101 / GVM-1220 / GVM-1000 supports Loopback initiated by OAM initiative device. During the process of
loopback, the Ethernet port operation of GVM-1101 / GVM-1220 / GVM-1000 will be disconnected. And after the
loopback, it will be reconnected.
6.5 Dying Gasp alarm
When GVM-1101 / GVM-1220 / GVM-1000 is power down, Dying Gasp alarm will be sent to OAM initiative
device.
