Configuring switchd

You can run NVUE commands to set the following switchd options:

• The statistic polling interval for physical interfaces and for logical interfaces.
  • For physical interfaces, you can specify a value between 1 and 10. The default setting is 2 seconds
  • For logical interfaces, you can specify a value between 1 and 30. The default setting is 5 seconds.

• The log level to debug the data plane programming related code. You can specify debug, info, notice, warning, or error. The default setting is info. NVIDIA recommends that you do not set the log level to debug in a production environment.
• The DSCP action and value for encapsulation. You can set the DSCP action to copy (to copy the value from the IP header of the packet), set (to specify a specific value), or derive (to obtain the value from the switch priority). The default action is derive. Only specify a value if the action is set.
• The DSCP action for decapsulation in VXLAN outer headers. You can specify copy (to copy the value from the IP header of the packet), preserve (to keep the inner DSCP value), or derive (to obtain the value from the switch priority). The default action is derive.
• The preference between a route and neighbor with the same IP address and mask. You can specify route, neighbor, or route-and-neighbor. The default setting is route.
• The ACL mode (atomic or non-atomic). The default setting is atomic.
• The reserved VLAN range. The default setting is 3725-3999.

The following command example sets both the statistic polling interval for logical interfaces and physical interfaces to 6 seconds:

cumulus@switch:~$ nv set system counter polling-interval logical-interface 6
cumulus@switch:~$ nv set system counter polling-interval physical-interface 6
cumulus@switch:~$ nv config apply

The following command example sets the log level for debugging the data plane programming related code to warning:

cumulus@switch:~$ nv set system forwarding programming log-level warning
cumulus@switch:~$ nv config apply

The following command example sets the DSCP action for encapsulation in VXLAN outer headers to set and the value to af12:

cumulus@switch:~$ nv set nve vxlan encapsulation dscp action set
cumulus@switch:~$ nv set nve vxlan encapsulation dscp value af12
cumulus@switch:~$ nv config apply

The following command example sets the DSCP action for decapsulation in VXLAN outer headers to preserve:

cumulus@switch:~$ nv set nve vxlan decapsulation dscp action preserve
cumulus@switch:~$ nv config apply

The following command example sets the route or neighbor preference to both route and neighbor:

cumulus@switch:~$ nv set system forwarding host-route-preference route-and-neighbour
cumulus@switch:~$ nv config apply

The following command example sets the ACL mode to non-atomic:

cumulus@switch:~$ nv set system acl mode non-atomic 
cumulus@switch:~$ nv config apply

The following command example sets the reserved VLAN range between 4064 and 4094:

cumulus@switch:~$ nv set system global reserved vlan internal range 4064-4094
cumulus@switch:~$ nv config apply

To configure the switchd parameters, edit the /etc/cumulus/switchd.conf file. Change the setting and uncomment the line if needed. The switchd.conf file contains comments with a description for each setting.

The following example shows the first few lines of the /etc/cumulus/switchd.conf file.

cumulus@switch:~$ sudo nano /etc/cumulus/switchd.conf
#
# /etc/cumulus/switchd.conf - switchd configuration file
#
# Statistic poll interval (in msec)
#stats.poll_interval = 2000

# Buffer utilization poll interval (in msec), 0 means disable
#buf_util.poll_interval = 0

# Buffer utilization measurement interval (in mins)
#buf_util.measure_interval = 0

# Optimize ACL HW resources for better utilization
#acl.optimize_hw = FALSE

# Enable Flow based mirroring.
#acl.flow_based_mirroring = TRUE
...

The following table describes the /etc/cumulus/switchd.conf file parameters and indicates if you need to restart switchd with the sudo systemctl restart switchd.service command or reload switchd with the sudo systemctl reload switchd.service command for changes to take effect when you update the setting.