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no reference clock.
ntp time zone
In the viewed information, ntp is-synchronized means if the cur-
rent switch is synchronized with server.
OAM
OAM Overview
OAM Overview
With the rapid development of Ethernet technology, Ethernet net-
working proportion gradually increases in network structure . Eth-
ernet devices replacing ATM network devices and other devices
are widely used in access, convergence layer and backbone net-
work. Due to the great application, Operation Administration Main-
tenance (OAM) function of Ethernet devices receive much concern.
The main Ethernet OAM protocols are shown below.
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OAM Function
OAM Protocol
IEEE 802.3ah operations, administration and maintenance stan-
Function
dard is the formal standard, which aims at the management of
link level. It monitors and troubleshoots the point to point (virtual
point to point) Ethernet link. It has the important meaning for
connection management of Last One Mile. The faults take place
constantly on Last One Mile.
ZXR10 2900 series switch supports IEEE 802.3ah.
Ethernet OAM
Ethernet OAM function on ZXR10 2900 series switch can be clas-
Main Function
sified into the following types.
1. OAM Discovery Function
2. Remote Link Event Alarm
: 0
IEEE 802.3ah (Operations, Administration, and Maintenance-
OAM)
IEEE 802.1ag (Connectivity Fault Management) (Draft)
ITU-Y 1731 (OAM functions and mechanisms for Ethernet
based networks ) (Draft)
After enabling Ethernet OAM function, ZXR10 2900 series
switch can detect the remote DTE device which has OAM
function. After coordinating with the peer OAM, enter normal
Ethernet OAM interaction process .
OAM function inspects the events of remote link, and adopts
the corresponding responding methods. When the fault takes
place on remote link, OAM defines the event and announces
Confidential and Proprietary Information of ZTE CORPORATION
Chapter 7 Service Configuration
185
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