Operation Manual – OAM
H3C S3610&S5510 Series Ethernet Switches
Chapter 1 OAM Configuration
1-4
Table 1-2
OAM link error events
OAM link events
Description
Error signal event
A signal error event occurs if the number of signal errors in
specific period exceeds the threshold.
Error frame event
A Frame error event occurs if the number of frame errors in
specific period exceeds the threshold.
Frame-percentage
error event
A frame-percentage error event occurs if the number of frame
errors in specific number of received frames exceeds the
threshold
Second-percentag
e error event
A second-percentage error second event occurs if the number
of error seconds in specific period (measured in seconds)
exceeds the threshold.
A second is called an error second if error frames occur in the
second.
III. Remote Fault Detection
Error detection in an Ethernet is difficult, especially when the physical connection in the
network is not interrupted but network performance degrades gradually. The flag field
defined in OAMPDUs allows an OAM entity to send error information to its peer. It can
identify the following link faults.
z
Link Fault: Peer link signal is lost.
z
Dying Gasp: An unexpected fault, such as power failure, occurred.
z
Critical Event: An undetermined critical event happened.
As Information OAMPDUs are sent periodically across OAM connections, an OAM
entity can inform one of its OAM peers of link faults through Information OAMPADUs to
enable the network administrator to get informed of link status and troubleshoot in time.
IV. Remote loopback testing
Remote loopback testing is available only after the OAM connection is established.
With remote loopback enabled, the OAM entity operating in active OAM mode issues
remote loopback requests and the peer responds to them. If the peer operates in the
loopback mode, it returns all the PDUs except OAMPDUs to the senders along the
original paths.
Performing remote loopback testing periodically helps to detecting network faults in
time. Furthermore, performing remote loopback testing by network segments helps to
locate network faults.
1.1.3 Standards and Protocols
OAM is defined in IEEE 802.3h.
