3com S7906E 설치 설명서

 

1-5 

Errored frame seconds event 

When the number of error frame seconds 
detected on a port over a detection interval 
reaches the error threshold, an errored frame 
seconds event occurs. 

 

z 

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, that is, 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) 

z 

If errored frames appear in a certain second, this second is called an errored frame second.  

 

In a network where traffic is interrupted due to device failures or unavailability, the flag field defined in 

Ethernet OAMPDUs allows an Ethernet OAM entity to send error information to its peer. It can identify 

the critical link error events listed in 

. 

Table 1-5 Critical link error events 

Link Fault 

Peer link signal is lost. 

Dying Gasp 

An unexpected fault, such as power failure, 
occurred. 

Critical event 

An undetermined critical event happened. 

 

As Information OAMPDUs are exchanged periodically across established OAM connections, an 

Ethernet OAM entity can inform one of its OAM peers of link faults through Information OAMPDUs. 

Therefore, the network administrator can keep track of link status in time through the log information 

and troubleshoot in time. 

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-OAMPDUs to its peer. After receiving these PDUs, 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 in time. Furthermore, performing remote loopback 

by network segments helps to locate network faults.