C613-50170-01 Rev B
Command Reference for x510 Series
324
AlliedWare Plus™ Operating System - Version 5.4.7-1.x
C
ONNECTIVITY
F
AULT
M
ANAGEMENT
C
OMMANDS
CC
INTERVAL
cc interval
Overview
Use this command to set the CCM Interval.
Syntax
cc ma-name <
ma-name
> interval <
interval
>
Default
The default interval is 4 (1 second).
Mode
Ethernet CFM Configuration
Usage
Continuity Checks is another term for connectivity fault detection. This makes use
of Continuity Check Messages (CCMs) that are periodically sent by an MEP
(multicast or unicast) and received by other MEP(s). CCMs can be used to detect
connectivity faults across a link (using Link Level MEPs) or across a segment of a
VLAN using VLAN aware MEPs, both of which are used within an MD/MA. CCMs are
sent periodically at a given rate (or frame interval) that is agreed upon by all the
MEPs in the MA. The faster the rate, the more quickly faults can be detected.
If an MEP does not receive a CCM within 3.5 times the expected interval from a peer
MEP(s), that MEP declares a connectivity fault. This is known as a “defect”. Upon
detecting a defect, the detecting MEP will also set the Remote Defect Indicator
(RDI) bit for its outgoing CCM messages to its peer MEP(s) so as to notify the peer
MEPs that a defect has been detected. If the defect persists long enough (generally
2.5 seconds), then an “alarm” is declared. If an alarm is declared, then the defect has
to abate long enough (generally 10 seconds) for the alarm to clear.
Example
To set the CCM interval of a Maintenance Association named “MA-INST2-1” to the
value of “4”, use the commands:
awplus(config)#
ethernet cfm domain-name MD-INST2
awplus(config-ether-cfm)#
cc ma-name MA-INST2-1 interval 4
Related
Commands
Parameter
Description
ma-name
Specify the Maintenance Association for which the Interval is
used.
<ma-name>
Specify the Maintenance Association's CLI instance name.
interval
Specify the CCM Interval.
<interval>
Specify the CCM Interval (CCI), using one of the following:
1 - CCI of 3 milliseconds (currently not supported)
2 - CCI of 10 milliseconds (currently not supported)
3 - CCI of 100 milliseconds
4 - CCI of 1 second
5 - CCI of 10 seconds
6 - CCI of 1 minute
7 - CCI of 10 minutes.
