D-Link DES-3528 - xStack Switch - Stackable, User Manual, Page: 134 / 322

xStack
®
DES-3528/DES-3552 Series Layer 2 Stackable Fast Ethernet Managed Switch User Manual
133
CFM
Connectivity Fault Management (CFM) is defined by IEEE 802.1ag, which is a standard for detecting, isolating and
reporting connectivity faults in a network. CFM is an end-to-end per-service-instance Ethernet layer operation,
administration, and management (OAM) function. CFM functions include path discovery, fault detection, fault
verification and isolation, and fault notification as defined by 802.1ag.
Ethernet CFM frames have a special Ether Type (0x8902). All CFM messages are confined to a maintenance domain
per VLAN basis. There are different message types which are identified by unique Opcode of the CFM frame payload.
CFM message types that are supported include; Continuity Check Message (CCM), Loopback Message and
Response (LBM, LBR) and Linktrace Message and Response (LTM and LTR).
CFM Port Settings
This table is used to enable or disable the connectivity fault management function on a per port basis. CFM is disabled
on all ports by default.
To view this window, click
L2 Features > CFM > CFM Port Settings
as shown below:
Figure 3 - 82 CFM Port Settings window
Enter the port list you wish to Enable and click
Apply
.
CFM CCM PDUs Forwarding Mode
This window is used to configure the CFM CCM PDU forwarding mode on the Switch. By default the CCM message is
handled and forwarded by software. The software can handle the packet based on behaviour defined by the standard.
Under a strict environment, there may be substantial amount of CCM packets, and it will consume a substantial
amount of CPU resources. To meet the performance requirement, the handling of CCM can be changed to hardware
mode.
To view this window, click
L2 Features > CFM > CFM CCM PDUs Forwarding Mode
as shown below: