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-neighbour. 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 neighbour preference to both route and neighbour:

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.

Parameter	Description	switchd reload or restart
stats.poll_interval	The statistics polling interval in milliseconds. The default setting is 2000.	restart
buf_util.poll_interval	The buffer utilization polling interval in milliseconds. 0 disables buffer utilization polling. The default setting is 0.	restart
buf_util.measure_interval	The buffer utilization measurement interval in minutes. The default setting is 0.	restart
acl.optimize_hw	Optimizes ACL hardware resources for better utilization. The default setting is FALSE.	restart
acl.flow_based_mirroring	Enables flow-based mirroring. The default setting is TRUE.	restart
acl.non_atomic_update_mode	Enables non atomic ACL updates The default setting is FALSE.	reload
arp.next_hops	Sends ARPs for next hops. The default setting is TRUE.	restart
route.table	The kernel routing table ID. The range is between 1 and 2^31. The default is 254.	restart
route.host_max_percent	The maximum neighbor table occupancy in hardware (a percentage of the hardware table size). The default setting is 100.	restart
coalescing.reducer	The coalescing reduction factor for accumulating changes to reduce CPU load. The default setting is 1.	restart
coalescing.timeout	The coalescing time limit in seconds. The default setting is 10.	restart
ignore_non_swps	Ignore routes that point to non-swp interfaces. The default setting is TRUE.	restart
disable_internal_parity_restart	Disables restart after a parity error. The default setting is TRUE.	restart
disable_internal_hw_err_restart	Disables restart after an unrecoverable hardware error. The default setting is FALSE.	restart
nat.static_enable	Enables static NAT. The default setting is TRUE.	restart
nat.dynamic_enable	Enables dynamic NAT. The default setting is TRUE.	restart
nat.age_poll_interval	The NAT age polling interval in minutes. The minimum is 1 minute and the maximum is 24 hours. You can configure this setting only when nat.dynamic_enable is set to TRUE. The default setting is 5.	restart
nat.table_size	The NAT table size limit in number of entries. You can configure this setting only when nat.dynamic_enable is set to TRUE. The default setting is 1024.	restart
nat.config_table_size	The NAT configuration table size limit in number of entries. You can configure this setting only when nat.dynamic_enable is set to TRUE. The default setting is 64.	restart
logging	Configures logging in the format BACKEND=LEVEL. Separate multiple BACKEND=LEVEL pairs with a space. The BACKEND value can be stderr, file:filename, syslog, program:executable. The LEVEL value can be CRIT, ERR, WARN, INFO, DEBUG. The default value is syslog=INFO	restart
interface.swp1.storm_control.broadcast	Enables broadcast storm control and sets the number of packets per second (pps). The default setting is 400.	reload
interface.swp1.storm_control.multicast	Enables multicast storm control and sets the number of packets per second (pps). The default setting is 3000.	reload
interface.swp1.storm_control.unknown_unicast	Enables unicast storm control and sets the number of packets per second (pps). The default setting is 2000.	reload
stats.vlan.aggregate	Enables hardware statistics for VLANs and specifies the type of statistics needed. You can specify NONE, BRIEF, or DETAIL. The default setting is BRIEF.	restart
stats.vxlan.aggregate	Enables hardware statistics for VXLANs and specifies the type of statistics needed. You can specify NONE, BRIEF, or DETAIL. The default setting is DETAIL.	restart
stats.vxlan.member	Enables hardware statistics for VXLAN members and specifies the type of statistics needed. You can specify NONE, BRIEF, or DETAIL. The default setting is BRIEF.	restart
stats.vlan.show_internal_vlans	Show internal VLANs. The default setting is FALSE.	restart
stats.vdev_hw_poll_interval	The polling interval in seconds for virtual device hardware statisitcs. The default setting is 5.	restart
resv_vlan_range	The internal VLAN range. The default setting is 3725-3999.	restart
netlink.buf_size	The netlink socket buffer size in MB. The default setting is 136314880.	restart
route.delete_dead_routes	Delete routes on interfaces when the carrier is down. The default setting is TRUE.	restart
vxlan.default_ttl	The default TTL to use in VXLAN headers. The default setting is 64.	restart
bridge.broadcast_frame_to_cpu	Enables bridge broadcast frames to the CPU even if the SVI is not enabled. The default setting is FALSE.	restart
bridge.unreg_mcast_init	Initialize the prune module for IGMP snooping unregistered layer 2 multicast flood control. The default setting is FALSE.	restart
bridge.unreg_v4_mcast_prune	Enables unregistered layer 2 multicast prune to mrouter ports (IPv4). The default setting is FALSE (flood unregistered layer 2 multicast traffic).	restart
bridge.unreg_v6_mcast_prune	Enables unregistered layer 2 multicast prune to mrouter ports (IPv6). The default setting is FALSE (flood unregistered layer 2 multicast traffic).	restart
netlink libnl logger	The default setting is [0-5].	restart
netlink.nl_logger	The default setting is 0.	restart
vxlan.def_encap_dscp_action	Sets the default VXLAN router DSCP action during encapsulation. You can specify copy if the inner packet is IP, set to set a specific value, or derive to derive the value from the switch priority. The default setting is derive.	restart
vxlan.def_encap_dscp_value	Sets the default VXLAN encapsulation DSCP value if the action is set.	restart
vxlan.def_decap_dscp_action	Sets the default VXLAN router DSCP action during decapsulation. You can specify copy if the inner packet is IP, preserve to preserve the inner DSCP value, or derive to derive the value from the switch priority. The default setting is derive.	restart
ipmulticast.unknown_ipmc_to_cpu	Enables sending unknown IPMC to the CPU. The default setting is FALSE.	restart
vrf_route_leak_enable_dynamic	Enables dynamic VRF route leaking. The default setting is FALSE.	restart
sync_queue_depth_val	The event queue depth. The default setting is 50000.	restart
route.route_preferred_over_neigh	Sets the preference between a route and neighbor with the same IP address and mask. You can specify TRUE to prefer the route over the neighbor, FALSE to prefer the neighbor over the route, or BOTH to install both the route and neighbor. The default setting is TRUE.	reload
evpn.multihoming.enable	Enables EVPN multihoming. The default setting is TRUE.	restart
evpn.multihoming.shared_l2_groups	Enables sharing for layer 2 next hop groups. The default setting is FALSE.	restart
evpn.multihoming.shared_l3_groups	Enables sharing for layer 3 next hop groups. The default setting is FALSE.	restart
evpn.multihoming.fast_local_protect	Enables fast reroute for egress link protection. The default setting is FALSE.	restart
link_flap_window	The duration in seconds during which a link must flap the number of times set in the link_flap_threshold before Cumulus Linux sets the link to protodown and specifies linkflap as the reason. The default setting is 10. A value of 0 disables link flap protection.	restart
link_flap_threshold	The number of times the link must flap within the link flap window before Cumulus Linux sets the link to protodown and specifies linkflap as the reason. The default setting is 5. A value of 0 disables link flap protection.	restart
res_usage_warn_threshold	Sets the percentage over which forwarding resources (routes, hosts, MAC addresses) must go before Cumulus Linux generates a warning. You can set a value between 50 and 95. The default setting is 90.	restart
res_warn_msg_int	The time interval in seconds between resource warning messages. Warning messages generate only one time in the specified interval per resource type even if the threshold falls below or goes over the value set in res_usage_warn_threshold multiple times during this interval. You can set a value between 60 and 3600. The default setting is 300.	restart