HP A5120 EI - Page 12

7
Ethernet OAM link events
Description
Errored frame event
An errored frame event occurs when the number of
detected error frames over a specific interval
exceeds the configured threshold.
Errored frame period event
An errored frame period event occurs if the number
of frame errors in a specific number of received
frames exceeds the configured threshold.
Errored frame seconds event
An errored frame seconds event occurs when the
number of error frame seconds detected on a port
over a 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 that a port can send in the specific 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).
 If errored frames appear in a certain second, this second is 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:
 A5120 EI Switch Series is able to receive information OAMPDUs carrying the critical link events listed in Table 8.
 Only the Gigabit optical ports are able to send information OAMPDUs carrying Link Fault events.
 A5120 EI 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 the IRF Configuration Guide .
 A5120 EI Switch Series is unable to send information OAMPDUs carrying Critical Events.
Remote loopback
Remote loopback is available only after the Ethernet OAM connection is established. With remote
loopback enabled, the Ethernet OAM entity operating in active Ethernet OAM mode sends non-