Technical data

Brocade 6910 Ethernet Access Switch Diagnostic Guide 29
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Connectivity Fault Management
CFM is implemented as a service level protocol based on service instances which encompass only
that portion of the metropolitan area network supporting a specific customer. CFM can also provide
controlled management access to a hierarchy of maintenance domains (such as the customer,
service provider, and equipment operator).
This switch supports functions for defining the CFM structure, including domains, maintenance
associations, and maintenance access points. It also supports fault detection through continuity
check messages for all known maintenance points, and cross-check messages which are used to
verify a static list of remote maintenance points located on other devices (in the same
maintenance association) against those found through continuity check messages. Fault
verification is supported using loop back messages, and fault isolation with link trace messages.
Fault notification is also provided by SNMP alarms which are automatically generated by
maintenance points when connectivity faults or configuration errors are detected in the local
maintenance domain.
To configure CFM), follow the guidelines in the Brocade 6910 Ethernet Access Switch Configuration
Guide. If you encounter any problems, use the following show command to display a summary of
the configuration settings and operational status for all rings, or detailed information for a specific
ring.
CFM show commands
This commands displays CFM configuration settings, including global settings, SNMP traps, and
interface settings.
show ethernet cfm configuration
Syntax: show ethernet cfm configuration {global | traps | interface interface}
global – Displays global settings including CFM global status, cross-check start delay, and link
trace parameters.
traps – Displays the status of all continuity check and cross-check traps.
interface – Displays CFM status for the specified interface.
ethernet unit/port
unit - Unit identifier. (Range: 1)
port - Port number. (Range: 1-12)
port-channel channel-id (Range: 1-12)
This example shows the global settings for CFM.
Console# show ethernet cfm configuration global
CFM Global Status : Enabled
Crosscheck Start Delay : 10 seconds
Linktrace Cache Status : Enabled
Linktrace Cache Hold Time : 100 minutes
Linktrace Cache Size : 100 entries
This example shows the configuration status for continuity check and cross-check traps.
Console# show ethernet cfm configuration traps
CC MEP Up Trap : Disabled
CC MEP Down Trap : Disabled
CC Configure Trap : Disabled
CC Loop Trap : Disabled
Cross Check MEP Unknown Trap : Disabled