H3C Technologies H3C S10500 Series Switches - Manual (Page 20)

11
Ethernet OAM link events Description
Errored frame seconds event
An errored frame seconds event occurs when the number of error
frame seconds detected on a port during a specified detection
interval reaches the error threshold.
NOTE:
•
The system transforms the period of detecting errored frame period events into the maximum number of
64-byte frames (excluding the interframe spacing and preamble) that a port can send in the specified
period. The system takes the maximum number of frames sent as the period. The maximum number of
frames sent is calculated using this formula: the maximum number of frames = interface bandwidth (bps)
× errored frame period event detection period (in ms)/(64 × 8 × 1000).
• A second in which errored frames appear is called an “errored frame second.”
Remote fault detection
Information OAMPDUs are exchanged periodically among Ethernet OAM entities across established
OAM connections. In a network where traffic is interrupted due to device failures or unavailability, the
flag field defined in information OAMPDUs allows an Ethernet OAM entity to send error
information—the critical link event type—to its peer. You can use the log information to track ongoing link
status and troubleshoot problems promptly.
Table 8 Critical link events
Type Description OAMPDU transmission frequencies
Link Fault Peer link signal is lost. Once per second
Dying Gasp
A power failure or other unexpected error
occurred.
Non-stop
Critical Event An undetermined critical event occurred. Non-stop
NOTE:
•
This Switch Series is able to receive information OAMPDUs carrying the critical link events listed in
Table
8 .
• This Switch Series is unable to support the sending of information OAMPDUs carrying Link Fault events.
• This Switch Series is able to send information OAMPDUs carrying Dying Gasp events when the device
is rebooted or relevant ports are manually shut down. Physical IRF ports, however, are unable to send
this type of OAMPDU. For more information about physical IRF ports, see
IRF Configuration Guide.
• This Switch Series is unable to send information OAMPDUs carrying Critical Events.
Standards and protocols
Ethernet OAM is defined in IEEE 802.3ah (Carrier Sense Multiple Access with Collision Detection
(CSMA/CD) Access Method and Physical Layer Specifications.
Ethernet OAM configuration task list
Complete the following tasks to configure Ethernet OAM: