HP 5500 Ei 5500 Si Switch Series Configuration Guide

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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...

 9 
Task Remarks 
Configuring errored frame period event detection Optional 
Configuring errored frame seconds event detection Optional 
Configuring Ethernet 
OAM remote 
loopback Enabling Ethernet OAM remote loopback 
Optional 
Rejecting the Ethernet OAM remote loopback 
request from a remote port Optional 
 
Configuring basic Ethernet OAM functions 
For Ethernet OAM connection establishment, an Ethern
et OAM entity operates in active mode or passive 
mode. Only an Ethernet OAM entity in active mode ca...

 10 
Step Command Remarks 
1.  Enter system view.  system-view  N/A 
2.  Configure the Ethernet OAM 
handshake packet 
transmission interval.  oam timer hello 
interval  Optional. 
1000 millisecond by default. 
3.
  Configure the Ethernet OAM 
connection timeout timer.  oam timer keepalive interval
 Optional. 
5000 milliseconds by default. 
 
Configuring link monitoring 
After Ethernet OAM connections are established, the 
link monitoring periods and thresholds configured 
in this section take effect on...

 11 
Configuring errored frame seconds event detection  
 IMPORTANT: 
Make sure the errored frame seconds tri
ggering threshold is less than the errored frame seconds detection
interval. Otherwise, no errored fram e seconds event can be generated.  
 
To configure errored frame seconds event detection:  
Step Command Remarks 
1.  Enter system view. 
system-view  N/A 
2.  Configure the errored frame 
seconds event detection 
interval.   oam errored-frame-seconds 
period 
period-value   Optional. 
60...

 12 
service loopback groups. For more information about link aggregation groups and service 
loopback groups, see Layer 2—LAN Switching Configuration Guide . 
•   Enabling internal loopback test on a port in remote loopback test can terminate the remote 
loopback test. For more information about loopback test, see  Layer 2—LAN Switching 
Configuration Guide
.  
Configuration procedure 
To enable Ethernet OAM remote loopback in user view:  
Task Command Remarks 
Enable Ethernet OAM remote 
loopback on a...

 13 
Displaying and maintaining Ethernet OAM 
configuration 
 
Task Command Remarks 
Display global Ethernet OAM 
configuration. display oam configuration
 [ | 
{  begin |  exclude | include  } 
regular-expression  ]   Available in any view 
Display the statistics on critical 
events after an Ethernet OAM 
connection is established.  display oam critical-event 
[
 interface  interface-type 
interface-number  ] [ |  { begin | 
exclude  | include  } 
regular-expression  ]   Available in any view 
Display...

 14 
[DeviceA-GigabitEthernet1/0/1] oam mode passive 
[DeviceA-GigabitEthernet1/0/1] oam enable 
[DeviceA-GigabitEthernet1/0/1] quit 
# Set the errored frame detection interval to 20 seconds and set the errored frame event triggering 
threshold to 10.  
[DeviceA] oam errored-frame period 20 
[DeviceA] oam errored-frame threshold 10 
2.  Configure Device B: 
# Configure GigabitEthernet 1/0/1 to operate in  active Ethernet OAM mode (the default) and 
enable Ethernet OAM for it.  
 system-view 
[DeviceB]...

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The output shows that no critical link event occurred on the link between Device A and Device B.  
You can use the display oam link-event  command to display the statistics of Ethernet OAM link 
error events. For example: 
# Display Ethernet OAM link event statistics of the remote end of Device B. 
[DeviceB] display oam link-event remote 
Port :GigabitEthernet1/0/1 
Link Status :Up 
OAMRemoteErrFrameEvent : (ms = milliseconds) 
---------------------------------------------------------------------...

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Configuring CFD 
CFD overview 
Connectivity Fault Detection (CFD), which conforms to IEEE 802.1ag Connectivity Fault Management 
(CFM) and ITU-T Y.1731, is an end-to-end per-VLAN link layer Operations, Administration and 
Maintenance (OAM) mechanism used for link connectivity  detection, fault verification, and fault location. 
Basic concepts in CFD 
Maintenance domain 
A maintenance domain (MD) defines the network where CFD plays its role. The MD boundary is defined 
by some maintenance association...

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An MA serves a VLAN. Packets sent by the MPs in an MA carry the relevant VLAN tag. An MP can 
receive packets sent by other MPs in the same MA. 
Maintenance point 
An MP is configured on a port and belongs to an MA. MPs fall into two types: maintenance association 
end points (MEPs) and maintenance association intermediate points (MIPs). 
•  MEP 
E a c h  M E P  i s  i d e n t i f i e d  b y  a n  i n t e g e r  c a l l e d  a   M E P  I D  .  T h e  M E P s  o f  a n  M D  d e f i n e  t h e  r a n...