interval (OAM)
Syntax
interval (100ms | 10m | 10ms | 10s | 1m | 1s| 3.3ms);
Hierarchy Level
[edit protocols oam ethernet connectivity-fault-management maintenance-domain domain-name maintenance-association ma-name continuity-check]
Description
Configure the interval between successive transmissions of continuity
check messages (CCMs) as part of the connectivity fault detection
strategy. When the receiving maintenance association end point (MEP)
does not receive a CCM at the configured interval, the loss-threshold statement determines how many CCMs can be lost before the sending
MEP is marked as down. The hold-interval statement then
determines the frequency at which the database of MEPs in the maintenance
association (MA) is flushed in the absence of updates.
When the continuity-check interval is set to 3.3ms, the actual interval is 4ms (250 pps).
During a unified in-service software upgrade (ISSU), Junos OS
connectivity fault management (CFM) works when the peer device is
not a Juniper Networks router. Interoperating with the router of another
vendor, the Juniper Networks router retains session information and
continues to transmit CCM (continuity check message) PDUs during the
unified ISSU upgrade. For this feature to work, you must enable Packet
Forwarding Engine keepalives with the hardware-assisted-keepalives statement, and configure the interval between CCMs to be 1 second
with interval statement.
For the continuity check message interval to be configured
for 10 milliseconds, periodic packet management (PPM) runs on the
Routing Engine and Packet Forwarding Engine by default. You can disable
PPM only on the Packet Forwarding Engine. To disable PPM on the Packet
Forwarding Engine, use the no-delegate-processing statement
at the [edit routing-options ppm] hierarchy level.
A continuity check interval of 10 milliseconds is not supported for CFM sessions over a label-switched interface (LSI).
Options
100ms—100 milliseconds.
10m—10 minutes.
10ms—10 milliseconds.
10s—10 seconds.
1m—1 minute.
1s—1 second.
3.3ms—3.3 milliseconds.
Default: 1m
Required Privilege Level
interface—To view this statement in the configuration.
interface-control—To add this statement to the configuration.
Release Information
Statement introduced in Junos OS Release 8.4.
Option 10ms introduced in Junos OS Release 9.1.
Third-party interoperability during a unified in-service software upgrade (ISSU) introduced in Junos OS Release 17.1.
Option 3.3ms introduced in Junos OS Release 17.2.