R3102-R3103-HP 6600/HSR6600 Routers High Availability Configuration Guide

11
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 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:
Maximum number of frames = interface bandwidth (bps) × errored frame period event detection
period (in ms)/(64 × 8 × 1000)
The 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 (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
Type
Description
OAMPDU transmission frequencies
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.
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