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Current/Total/Max Group Nums:
View-only field.
Current: This shows the number of current registered Static IP address(es).
Total: This shows the total number of registered Static IP address(es).
Max: This shows the maximum number available for Static ID address registration.
IP address:
Specify an static IP address that you accept.
Mask Address:
Specify the subnet mask address.
VLAN ID:
Specify the VLAN ID. (0 means without VLAN ID)
Port:
Specify the communication port number. (Port 1~22)
4.4.15 CFM Configuration
Ethernet Connectivity Fault Management (CFM) is an end-to-end and service-to-service
Ethernet layer operations, administration and maintenance (OAM) 802.1ag protocol. It
includes practical connectivity monitoring, fault verification and fault isolation for large
Ethernet metropolitan-area networks (MANs) and WANs.
As its name implies, IEEE 802.1ag focuses on the connectivity fault management which
provides the following four features on each Virtual Local Area Network (VLAN) basis.
Fault Detection/Fault notification
Fault verification
Fault isolation
Fault Detection/Fault notification
IEEE 802.1ag supports fault detection through Continuity Check Messages (CCM). CCM is
somewhat like the “keep-alive” message. By default, every 802.1ag-capable network device
(ND)
sends out “heart-beat” style CCM periodically. Hence, by configuring a list of expected
existent remote 802.1ag-capable NDs, the local 802.1ag-capable ND can detect the health
status of its connection to the remote ND.
Fault verification
IEEE 802.1ag supports fault verification through Loopback Messages (LBM) and Loopback
Reply (LBR). The LBM/LBR mechanism is similar to ICMP “ping” function in the IP network.
However, since the interfaces of an ND in an Ethernet network may not possess their
indiv
idual IP address, the operator can not achieve fault verification by ICMP “ping” in such
a network environment.
Fault isolation
In addition to the LBM/LBR mechanism, IEEE 802.1ag supports fault isolation
through
Linktrace Messages (LTM) and Linktrace Reply (LTR). The LTM/LTR mechanism is similar
to the
“trace route” function in the IP network. However, since the interfaces of an ND in an
Ethernet network may not possess their individual IP address, the operator can not achieve
fault isolation by “trace route” in such a network environment.