R3303-HP HSR6800 Routers High Availability Configuration Guide

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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 (any
critical link event type shown in Table 8) to its peer
. You can use the log information to track ongoing link
status and troubleshoot problems promptly.
Table 8 Critical link events
T
yp
e Descri
p
tion OAMPDU transmission fre
q
uencies
Link Fault Peer link signal is lost. Once per second.
Dying Gasp
An unexpected fault, such as power failure,
occurred.
Non-stop.
Critical Event An undetermined critical event happened. Non-stop.
HP devices are able to receive Information OAMPDUs carrying the critical link events listed in Table 8.
HP devices are able to send Information OAMPDUs carrying Dying Gasp events when the device is
rebooted or relevant ports are manually shut down.
HP devices are unable to send Information OAMPDUs carrying Critical Events.
IRF physical ports do not support OAM-related functions.
Remote loopback
Remote loopback is available only after the Ethernet OAM connection is established. With remote
loopback enabled, the Ethernet OAM entity in active mode sends non-OAMPDUs to its peer. After
receiving these frames, the peer does not forward them according to their destination addresses. Instead,
it returns them to the sender along the original path.
Remote loopback enables you to check the link status and locate link failures. Performing remote
loopback periodically helps to detect network faults promptly. Furthermore, performing remote loopback
by network segments helps to locate network faults.
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
Task Remarks
Configuring basic Ethernet OAM functions Required
Configuring the Ethernet OAM connection detection timers Required
Configuring link
monitoring
Configuring errored symbol event detection Optional
Configuring errored frame event detection Optional
Configuring errored frame period event detection Optional