SAI-specific variables
Variables read by the Broadcom SAI itself rather than the SDK. They live in the same config.bcm file. Most select a SAI policy or a resource budget that the SAI reports to SONiC; they do not change the size of a hardware table.
Set in several SONiC Trident 3 HWSKU files: sai_brcm_sonic_acl_enhancements, sai_brcm_sonic_trap_group, sai_eapp_config_file, sai_fast_convergence_support, sai_fdb_entry_l2_discard_src_enable, sai_interface_type_auto_detect, sai_load_hw_config, sai_mdio_access_clause22, sai_nbr_bcast_ifp_optimized, sai_optimized_mmu, sai_pfc_defaults_disable, sai_postinit_cmd_file, sai_preinit_cmd_file, sai_stats_support_mask, sai_tunnel_support, sai_tunnel_underlay_route_mode, sai_verify_incoming_chksum.
- sai_200g_4_rsfec_mode_def_544
- Type:
- number
- Default:
0
Use RS-544 by default for 200G 4-lane ports.
- sai_acl_qset_optimization
- Type:
- number
- Default:
0
Build smaller field-processor qualifier sets for ACL tables, so more tables fit.
- sai_acl_redir_nexthop_use_l3_switch
- Type:
- number
- Default:
0
Implement ACL redirect-to-next-hop with an L3 switch action.
- sai_adj_mirror_drops_if_port_and_queue
- Type:
- number
- Default:
0
Account mirror drops in the port and queue drop counters.
- sai_adjust_acl_drop_in_rx_drop
- Type:
- number
- Default:
0
Count packets dropped by an ingress ACL in the port’s receive-drop counter.
- SONiC:
set in 2 Trident 3 HWSKU files;
1
- sai_adjust_acl_drop_out_tx_drop
- Type:
- number
- Default:
0
Count packets dropped by an egress ACL in the port’s transmit-drop counter.
- sai_adjust_port_if_in_discards
- Type:
- number
- Default:
0
Adjust the port
IF_IN_DISCARDScounter to include further drop reasons.
- sai_api_log_enable
- Type:
- number
- Default:
0
Log SAI API calls to an in-memory buffer.
- sai_api_log_mem_size
- Type:
- number
- Default:
4194304
Size in bytes of the SAI API log buffer.
- sai_async_fdb_nbr_enable
- Type:
- number
- Default:
0
Process FDB and neighbour changes asynchronously.
- sai_brcm_sonic_acl_enhancements
- Type:
- number
- Default:
0
Enable ACL behaviour tailored to SONiC (for example how ACL tables share field-processor groups).
- SONiC:
set in 5 Trident 3 HWSKU files;
1
- sai_brcm_sonic_trap_group
- Type:
- number
- Default:
0
Create host-interface traps in the way SONiC’s trap groups expect.
- SONiC:
set in 6 Trident 3 HWSKU files;
1
- sai_bypass_nh_fwd_count_check
- Type:
- number
- Default:
0
Skip the next-hop reference-count check.
- sai_common_hash_crc
- Type:
- number
- Default:
0
Use one CRC hash configuration for ECMP and LAG.
- sai_cos_tc_to_q_map_invert
- Type:
- number
- Default:
1
Invert the default traffic-class to queue map.
- sai_cpu_drop_mirror_queue
- Type:
- number
- Default:
0
CPU queue that receives drop-mirrored packets.
- sai_cpu_mirror_queue
- Type:
- number
- Default:
0
CPU queue that receives mirrored packets.
- sai_cpu_port_static_move_drop
- Type:
- number
- Default:
0
Drop packets whose source MAC is statically bound to the CPU port when they arrive on another port.
- sai_cpu_queue_stats_mode
- Type:
- number
- Default:
0
How CPU queue statistics are collected.
- sai_create_dflt_trap
- Type:
- number
- Default:
0
Create the SAI’s default trap at start-up.
- sai_crm_hw_nh_group_cnt
- Type:
- number
- Default:
0
Next-hop group count reported to SONiC’s resource monitor.
- sai_crm_hw_nh_group_member_cnt
- Type:
- number
- Default:
0
Next-hop group member count reported to SONiC’s resource monitor.
- sai_custom_init_profile
- Type:
- number
- Default:
0
Select a custom SAI initialisation profile.
- sai_default_cpu_tx_tc
- Type:
- number
- Default:
0
Traffic class of packets sent by the CPU without one.
- sai_default_tc_to_pg_map
- Type:
- number
- Default:
0
Install a default traffic-class to priority-group map on every port.
- sai_dis_ctr_incr_on_port_ln_dn
- Type:
- number
- Default:
0
Do not count packets on a port while its link is down.
- sai_disable_internal_port_serdes
- Type:
- number
- Default:
0
Power down the SerDes of internal (loopback, recycle) ports.
- sai_disable_ports_when_sw_shutdown
- Type:
- number
- Default:
0
Disable all ports when the switch is shut down.
- sai_disable_srcmacqedstmac_ctrl
- Type:
- number
- Default:
0
Do not drop packets whose source MAC equals the destination MAC.
- sai_dpb_port_map_static
- Type:
- number
- Default:
0
Keep the port map static across dynamic port breakout.
- sai_eapol_trap_use_bcast_mac
- Type:
- number
- Default:
0
Match EAPOL traps on the broadcast MAC as well as the PAE group address.
- sai_eapp_config_file
- Type:
- string
JSON file describing the embedded applications (flow tracker, IFA, BFD firmware) the SAI loads. SONiC files point to
/etc/broadcom/eapps_cfg.json.- SONiC:
set in 14 Trident 3 HWSKU files;
/etc/broadcom/eapps_cfg.json
- sai_ecmp_default_crc_hash
- Type:
- number
- Default:
0
Use the CRC hash for ECMP by default.
- sai_ecmp_group_members_increment
- Type:
- number
- Default:
4
Step by which ECMP group member space grows.
- sai_egr_mod_reserved_vlan
- Type:
- number
- Default:
0
VLAN reserved for egress packet modification.
- sai_egress_queue_stats_sampling_interval
- Type:
- number
- Default:
250
Sampling interval of egress queue statistics.
- sai_encrypted_pfc_enable
- Type:
- number
- Default:
0
Enable PFC frames over MACsec-encrypted links.
- sai_eventor_port_lane_base
- Type:
- number
- Default:
- unset
First lane of the eventor port.
- sai_exclude_inports_qual
- Type:
- number
- Default:
0
Leave the
InPortsqualifier out of ACL tables.
- sai_fadtmin_offset
- Type:
- number
- Default:
256
Offset added to the minimum dynamic threshold (FADT) of queues.
- sai_fast_convergence_support
- Type:
- number
- Default:
0
Enable faster route convergence on link down (pre-programmed next-hop failover).
- SONiC:
set in 17 Trident 3 HWSKU files;
1
- sai_fdb_entry_l2_discard_src_enable
- Type:
- number
- Default:
0
Drop packets whose source MAC matches a discard FDB entry.
- SONiC:
set in 3 Trident 3 HWSKU files;
1
- sai_feat_tail_timestamp
- Type:
- number
Enable tail timestamping for telemetry.
- sai_fec_acc_collect_interval
- Type:
- number
- Default:
1
Collection interval of the accumulated FEC counters.
- sai_fec_stats_cumulative
- Type:
- number
- Default:
0
Report FEC counters cumulatively instead of since the last read.
- sai_field_group_auto_prioritize
- Type:
- number
- Default:
0
Let the SAI order field-processor groups by priority itself.
- sai_fld_stats_use_flexctr
- Type:
- number
- Default:
0
Collect field (ACL) statistics with flex counters.
- sai_fpem_flexctr_stats_size
- Type:
- number
- Default:
8192
Number of flex counters reserved for exact-match statistics.
- sai_global_scoped_rcy_port
- Type:
- number
- Default:
- unset
Recycle port shared by all pipes.
- sai_host_if_unit_vpp
- Type:
- number
- Default:
1
Host-interface unit for virtual-port packets.
- sai_hostif_netif_iff_up_set
- Type:
- number
- Default:
0
Bring host network interfaces administratively up when they are created.
- SONiC:
set in 1 Trident 3 HWSKU file;
1
- sai_hostif_trap_types_arp_needed
- Type:
- number
- Default:
1
Install the ARP traps the host interface needs by default.
- sai_hw_encrypted_pfc_enable
- Type:
- number
- Default:
0
Enable hardware PFC over MACsec-encrypted links.
- sai_ifa2_cosq_stats_invalid_value
- Type:
- number
- Default:
524287
Value reported for an unavailable queue statistic in IFA 2.0 metadata.
- sai_ifa_config
- Type:
- string
IFA configuration string (loopback ports and parameters).
- sai_ifacc_config
- Type:
- string
IFA collector configuration string.
- sai_ifp_enable_on_cpu_tx
- Type:
- number
- Default:
0
Apply ingress field-processor rules to packets sent by the CPU.
- sai_instru_stat_accum_enable
- Type:
- number
- Default:
0
Accumulate instrumentation statistics in software.
- sai_interface_type_auto_detect
- Type:
- number
- Default:
1
Set a port’s interface type from the detected transceiver. Several SONiC Trident 3 files set 0.
- SONiC:
set in 4 Trident 3 HWSKU files;
0
- sai_ip_counter_cstats
- Type:
- number
- Default:
0
Collect IP counters with the CSTATS engine.
- sai_ipv6_flow_label_support
- Type:
- number
- Default:
0
Include the IPv6 flow label in hashing.
- sai_l2_cpu_fdb_event_suppress
- Type:
- number
- Default:
0
Do not send FDB events for entries pointing to the CPU.
- sai_l2pt_feature_support
- Type:
- number
- Default:
0
Enable L2 protocol tunnelling.
- sai_l3_byte1_udf_disable
- Type:
- number
- Default:
0
Do not reserve the UDF used for the second byte of the L3 header.
- sai_l3_max_ecmp_groups
- Type:
- number
Number of ECMP groups the SAI reports and allows.
- sai_l3_max_ecmp_paths
- Type:
- number
- Default:
64
Maximum number of members per ECMP group the SAI allows.
- sai_l3_max_ipv4_neighbors
- Type:
- number
- Default:
6144
IPv4 neighbour count the SAI reports.
- sai_l3_max_ipv4_routes
- Type:
- number
- Default:
1048576
IPv4 route count the SAI reports to SONiC’s resource monitor.
- sai_l3_max_ipv6_neighbors
- Type:
- number
- Default:
2560
IPv6 neighbour count the SAI reports.
- sai_l3_max_ipv6_routes
- Type:
- number
- Default:
1048576
IPv6 route count the SAI reports to SONiC’s resource monitor.
- sai_l3_max_nexthops
- Type:
- number
- Default:
16384
Next-hop count the SAI reports.
- sai_l3_max_vrfs
- Type:
- number
- Default:
32
Number of VRFs the SAI allows.
- sai_l3_neighbor_discard_flag_capable
- Type:
- number
- Default:
1
Program neighbour drops with the hardware discard flag.
- sai_l3_route_discard_flag_capable
- Type:
- number
- Default:
1
Program route drops with the hardware discard flag.
- sai_l3_route_table_db_type
- Type:
- number
- Default:
1
Data structure the SAI uses for its route database.
- sai_lag_default_crc_hash
- Type:
- number
- Default:
0
Use the CRC hash for LAG by default.
- sai_led_ploc_mode
- Type:
- number
- Default:
0
Port-locator LED mode.
- sai_legacy_ledproc_linkscan_cb
- Type:
- number
- Default:
1
Update the LED processor from the link-scan callback (legacy LED firmware).
- sai_load_hw_config
- Type:
- string
Directory with the Cancun (flex pipeline) package the SAI loads at start-up, for example
/usr/lib/cancun/or a versioned/etc/bcm/flex/bcm56870_a0_premium_issu/…/directory. Without it the SAI uses its built-in default.- SONiC:
set in 27 Trident 3 HWSKU files;
/etc/bcm/flex/bcm56870_a0_premium_issu/b870.6.4.1/,/usr/lib/cancun/,/usr/share/sonic/platform/cancun/sdk6.5.24/
- sai_mac_policy_vfp_group
- Type:
- number
- Default:
1
Create the VLAN field-processor group used for MAC-based policies.
- sai_macro_flow_based_hash
- Type:
- number
- Default:
0
Use macro-flow based hashing for ECMP.
- sai_macsec_egr_btr_hw_config
- Type:
- number
- Default:
0
MACsec egress hardware configuration.
- sai_max_counters
- Type:
- number
- Default:
0
Maximum number of flex counters the SAI allocates.
- sai_mdio_access_clause22
- Type:
- number
- Default:
0
Use clause 22 for SAI MDIO accesses. Set to 1 in some SONiC Trident 3 files.
- Forms:
sai_mdio_access_clause22_<N>- SONiC:
set in 3 Trident 3 HWSKU files;
1
- sai_mdio_access_clause45
- Type:
- number
- Default:
0
Use clause 45 for SAI MDIO accesses.
- sai_misc_group_priority
- Type:
- number
Priority of the SAI’s miscellaneous field-processor group.
- sai_mmu_custom_config
- Type:
- number
- Default:
0
Use a custom MMU configuration instead of the SAI’s default buffer set-up.
- Type:
- number
- Default:
3126
Shared limit of the lossless pool’s queue-entry resources.
- Type:
- number
- Default:
12500
Shared limit of the lossy pool’s queue-entry resources.
- sai_mmu_max_buffer_profiles
- Type:
- number
- Default:
32
Maximum number of buffer profiles the SAI accepts.
- sai_mmu_mod_queue_number
- Type:
- number
Queue used for mirror-on-drop packets.
- sai_mmu_mod_queue_number_ipep
- Type:
- number
- Default:
- unset
Queue used for mirror-on-drop packets dropped in the pipeline.
- sai_mmu_mod_queue_number_mmu
- Type:
- number
- Default:
- unset
Queue used for mirror-on-drop packets dropped in the MMU.
- sai_mmu_qgroups_default
- Type:
- number
- Default:
0
Create default queue groups.
- sai_mmu_reset_hdrm_on_create
- Type:
- number
- Default:
1
Reset priority-group headroom when a buffer profile is created.
- sai_mmu_tc_to_pg_config
- Type:
- number
- Default:
0
Program the traffic-class to priority-group map from the SAI’s MMU configuration.
- SONiC:
set in 1 Trident 3 HWSKU file;
1
- sai_mod_pkt_eventor_header_enable
- Type:
- number
- Default:
0
Add the eventor header to mirror-on-drop packets.
- sai_mptnl_use_tunnel_underlay_port_rif
- Type:
- number
- Default:
0
Use the underlay port’s router interface for tunnel next hops.
- sai_multi_rif_supported
- Type:
- number
- Default:
0
Allow several router interfaces on one port.
- sai_nbr_bcast_ifp_optimized
- Type:
- number
- Default:
0
Use fewer ingress field-processor entries for neighbour (ARP/ND) broadcast traps.
- SONiC:
set in 9 Trident 3 HWSKU files;
1,2
- sai_nos_reserved_l3_encap_range_begin
- Type:
- number
- Default:
- unset
First L3 encapsulation index reserved for the network operating system.
- sai_nos_reserved_l3_encap_range_end
- Type:
- number
- Default:
- unset
Last L3 encapsulation index reserved for the network operating system.
- sai_ocb_fc_config
- Type:
- number
- Default:
0
On-chip buffer flow-control configuration.
- sai_optimize_acl_ipv6_addr_qual
- Type:
- number
- Default:
1
Use a compressed IPv6 address qualifier in ACL tables.
- sai_optimized_mmu
- Type:
- number
- Default:
0
Use the SAI’s optimised MMU defaults. Set to 1 in several SONiC Trident 3 files.
- SONiC:
set in 7 Trident 3 HWSKU files;
1
- sai_ospfv3_ipsec_trap
- Type:
- number
- Default:
0
Trap OSPFv3 packets carried in IPsec to the CPU.
- sai_parent_subport_rif_intf_support
- Type:
- number
- Default:
0
Allow a router interface on a parent port that also has sub-port interfaces.
- sai_pfc_defaults_disable
- Type:
- number
- Default:
0
Do not program the SAI’s default PFC settings.
- SONiC:
set in 4 Trident 3 HWSKU files;
1
- sai_pfc_dlr_init_capability
- Type:
- number
Advertise PFC deadlock-recovery capability at start-up.
- SONiC:
set in 2 Trident 3 HWSKU files;
1' -%}
- sai_phy_an_mode_c73
- Type:
- number
- Default:
0
Auto-negotiation mode the SAI uses for clause 73.
- sai_pkt_dscp_modification_disable
- Type:
- number
- Default:
0
Do not rewrite DSCP on egress.
- sai_port_attr_pvid_config
- Type:
- number
- Default:
1
Allow the port VLAN ID to be set through the port attribute.
- sai_port_default_burst_size
- Type:
- number
- Default:
1024
Default burst size of port shapers and policers.
- sai_port_gearbox
- Type:
- number
- Default:
0
Ports are connected through an external gearbox.
- Forms:
sai_port_gearbox_<port>,sai_port_gearbox_<type>,sai_port_gearbox
- sai_port_ip_byte_stat
- Type:
- number
- Default:
0
Collect per-port IP byte counters.
- sai_port_pg_lossless_config
- Type:
- number
- Default:
0
Configure default lossless priority groups on ports.
- sai_port_phy_time_sync_en
- Type:
- number
- Default:
0
Enable PHY-based time synchronisation on ports.
- sai_port_pmap_phy_lanes
- Type:
- number
- Default:
0
Take a port’s PHY lanes from the port map.
- sai_port_queue_ecn_counter
- Type:
- number
- Default:
0
Collect per-queue ECN-marked counters.
- sai_postinit_cmd_file
- Type:
- string
Diag-shell script the SAI runs after the SDK is initialised on a cold start.
- SONiC:
set in 4 Trident 3 HWSKU files;
/usr/share/sonic/hwsku/sai_postinit_cmd.soc,/usr/share/sonic/platform/postinit_cmd_file.soc
- sai_postinit_warmboot_cmd_file
- Type:
- string
As
sai_postinit_cmd_file, for a warm start.
- sai_preinit_cmd_file
- Type:
- string
Diag-shell script the SAI runs during a cold start, just before
init misc. Dell S5232F files use it to load the LED firmware withm0.- SONiC:
set in 11 Trident 3 HWSKU files;
/usr/share/sonic/hwsku/sai_preinit_cmd.soc,/usr/share/sonic/platform/preinit_cmd_file.soc
- sai_preinit_warmboot_cmd_file
- Type:
- string
As
sai_preinit_cmd_file, for a warm start.
- sai_ptp_firmware_type
- Type:
- number
- Default:
0
Which PTP firmware the SAI loads.
- sai_rcy_enable_on_cpu_tx
- Type:
- number
- Default:
0
Allow packets sent by the CPU to be recirculated.
- sai_rdma_udf_disable
- Type:
- number
- Default:
0
Do not reserve the UDF used for RDMA (RoCE) fields.
- sai_recycle_port_lane_base
- Type:
- number
- Default:
- unset
First lane of the recycle port.
- sai_remap_prio_on_tnl_egress
- Type:
- number
- Default:
0
Remap packet priority when a packet leaves a tunnel.
- sai_retain_mmu_settings_on_speed_change
- Type:
- number
- Default:
1
Keep a port’s buffer settings when its speed changes.
- sai_retry_fdb_delete
- Type:
- number
- Default:
0
Retry FDB deletes that fail.
- sai_skip_create_sys_efp_grp
- Type:
- number
- Default:
0
Do not create the SAI’s system egress field-processor group.
- sai_sonic_use_route_max
- Type:
- number
- Default:
0
Report the maximum route count to SONiC’s resource monitor instead of the currently available count.
- sai_stats_disable_mask
- Type:
- number
- Default:
0
Bit mask of statistics the SAI does not collect.
- sai_stats_support_mask
- Type:
- number
- Default:
0
Bit mask of optional statistics the SAI supports. Set to
0x1in several SONiC Trident 3 files.- SONiC:
set in 6 Trident 3 HWSKU files;
0x1
- sai_suspend_on_error
- Type:
- number
- Default:
0
Stop the SAI on an internal error, for debugging.
- sai_svi_my_station_optimization
- Type:
- number
- Default:
0
Share station (router MAC) entries between VLAN interfaces.
- sai_swap_transport_tag_support
- Type:
- number
- Default:
0
Allow swapping the transport VLAN tag.
- sai_switch_ecc_event_throttle
- Type:
- number
- Default:
0
Throttle ECC (soft-error) events reported to SONiC.
- sai_switch_mac_tnl_term_enable
- Type:
- number
- Default:
0
Terminate tunnels addressed to the switch MAC.
- sai_switch_pcie_hotswap_disable
- Type:
- number
- Default:
255
Disable PCIe hot-swap handling.
- sai_tc_based_queue_stats_enable
- Type:
- number
- Default:
1
Report queue statistics per traffic class.
- Type:
- number
- Default:
0
Let mirrored traffic use the shared buffer.
- sai_tc_mirror_buffer_size_bytes
- Type:
- number
- Default:
0
Buffer reserved for mirrored traffic, in bytes.
- sai_tcam_opt_support_all_rifs_disable
- Type:
- number
- Default:
0
Disable the TCAM optimisation that matches all router interfaces with one rule.
- sai_track_objects
- Type:
- number
- Default:
0
Track created SAI objects for debugging.
- sai_trap_fp_action_drop_copy_to_cpu
- Type:
- number
- Default:
0
Implement trap actions as drop plus copy-to-CPU.
- sai_trap_group_priority
- Type:
- number
Priority of the field-processor group used for traps.
- sai_traps_use_global_efp_group
- Type:
- number
- Default:
1
Put trap-related egress rules in one global egress field-processor group.
- sai_trigger_linkscan_remote_local_faults
- Type:
- number
- Default:
1
Let link scan react to remote and local fault states.
- sai_tunnel_ecmp_sharing_mode
- Type:
- number
- Default:
0
Whether tunnels share ECMP groups.
- sai_tunnel_global_sip_mask_enable
- Type:
- number
- Default:
0
Allow masked source-IP tunnel termination.
- sai_tunnel_ipinip_multi_vrf_support
- Type:
- number
- Default:
0
Allow IP-in-IP tunnels in several VRFs.
- sai_tunnel_iptnl_scale
- Type:
- number
- Default:
- unset
Number of IP-in-IP tunnels the SAI sizes for.
- sai_tunnel_support
- Type:
- number
- Default:
0
Enable tunnel (VXLAN, IP-in-IP) support in the SAI. Needed for VXLAN in SONiC.
- SONiC:
set in 26 Trident 3 HWSKU files;
1- On Seastone2:
sai_tunnel_support=1
- sai_tunnel_underlay_max_path
- Type:
- number
- Default:
0
Maximum ECMP paths for a tunnel’s underlay.
- sai_tunnel_underlay_route_mode
- Type:
- number
How the SAI resolves tunnel underlay routes.
- SONiC:
set in 3 Trident 3 HWSKU files;
1
- sai_tunnel_vxlan_scale
- Type:
- number
- Default:
1
Select the SAI’s VXLAN scale profile.
- sai_tunnel_vxlan_scale_number
- Type:
- number
- Default:
0
Number of VXLAN tunnels the SAI sizes for.
- sai_uncached_port_stats
- Type:
- number
- Default:
0
Read port statistics directly from hardware.
- sai_uncached_queue_stats
- Type:
- number
- Default:
0
Read queue statistics directly from hardware.
- sai_uncached_stats
- Type:
- number
- Default:
0
Read statistics directly from hardware instead of the counter cache.
- sai_use_dest_host_hit_variant
- Type:
- number
- Default:
0
Use the destination hit bit of host entries for neighbour aging.
- sai_verify_incoming_chksum
- Type:
- number
- Default:
1
Check the IPv4 header checksum of received packets. Some SONiC Trident 3 files set 0.
- SONiC:
set in 5 Trident 3 HWSKU files;
0
- sai_vfp_enable_on_cpu_tx
- Type:
- number
- Default:
0
Apply VLAN field-processor rules to packets sent by the CPU.
- sai_vfp_fragment_l4_hash_disable
- Type:
- number
- Default:
0
Do not hash on L4 ports for IP fragments.
- sai_vfp_learn_policy_disable
- Type:
- number
- Default:
0
Do not use the VLAN field processor for MAC-learning policy.
- sai_vfp_smac_drop_filter_disable
- Type:
- number
- Default:
0
Do not install the source-MAC drop filter in the VLAN field processor.
- sai_vfp_smac_drop_filter_drop_enable
- Type:
- number
- Default:
0
Make the source-MAC filter drop (rather than only mark) matching packets.
- sai_vfp_subport_rif_vfp_action_override_disable
- Type:
- number
- Default:
0
Do not override VLAN field-processor actions for sub-port router interfaces.
- sai_vlan_counter_alloc_disable
- Type:
- number
- Default:
0
Do not allocate VLAN counters.
- sai_voq_wm_latency_enable
- Type:
- number
- Default:
0
Report latency watermarks for virtual output queues.