Configuring Optimized BFD Path


To address BFD flaps, Netvisor ONE offers an optimized path for BFD control packets to reach a destination vRouter. BFD packets are relayed by the Netvisor ONE OS from the switch to the destination vRouter using a PCIe link which connects one of the switch ports to the host CPU. The BFD fastpath functionality alleviates BFD timeout/delay issues when other high bandwidth traffic is coming to the host CPU.


The optimized path option can be enabled or disabled using the command:


CLI (network-admin@switch) > system-settings-modify


system-settings-modify

Use this command to modify system settings.

Specify one or more of the following options:


optimize-arps|no-optimize-arps

Enable or disable ARP optimization.

lldp|no-lldp

Enable or disable LLDP.

policy-based-routing|no-policy-based-routing

Enable or disable Policy-Based Routing (PBR). This enables flexible packet forwarding and routing through user-defined policies.

optimize-nd|no-optimize-nd

Enable or disable ND optimization.

reactivate-mac|no-reactivate-mac

Enable or disable reactivation of aged out MAC entries.

reactivate-vxlan-tunnel-mac|no-reactivate-vxlan-tunnel-mac

Enable or disable reactivation of MAC entries over VXLAN tunnels.

manage-unknown-unicast|no-manage-unknown-unicast        

Enable or disable unknown unicast management.

manage-broadcast|no-manage-broadcast

Enable or disable broadcast management

block-loops|no-block-loops

Enable or disable loop blocking.


Note:  This parameter is available only on NSU, NRU-02, NRU-03, and NRU-S0301 platforms.

auto-trunk|no-auto-trunk

Enable or disable auto trunking.

auto-host-bundle|no-auto-host-bundle

Enable or disable auto host bundling.

cluster-active-active-routing|no-cluster-active-active-routing

Enable or disable active-active routing on a cluster.

fast-route-download|no-fast-route-download

Enable or disable fast route download from routesnoop.

fast-interface-lookup|no-fast-interface-lookup

Enable or disable fast router interface lookup.

routing-over-vlags|no-routing-over-vlags

Enable or disable routing to vLAGs from cluster links.

source-mac-miss to-cpu|copy-to-cpu

Specify either of the options as the unknown source MAC learn behavior.

use-igmp-snoop-l2|use-igmp-snoop-l3        

Specify whether L2 or L3 tables are to be used for IGMP snooping.

vle-tracking-timeout <3..30>

Set a vLE tracking timeout as a value between 3 and 30s. The default timeout is 3s.

pfc-buffer-limit pfc-buffer-limit-string

Specify the percent of global system buffer space allowed for PFC.

cosq-weight-auto|no-cosq-weight-auto

Specify either of the options to enable or disable automatic weight assignment for CoS (Class of Service) queues based on min-guarantee configuration.

lossless-mode|no-lossless-mode        

Enable or disable lossless mode.

stagger-queries|no-stagger-queries

Stagger igmp/mld snooping queries.

host-refresh|no-host-refresh

Enable or disable refreshing host ARP entries to keep L2 entries active.

proxy-conn-retry|no-proxy-conn-retry

Enable or disable proxy connection retry.

proxy-conn-max-retry 0..10

Set the maximum number of proxy connection retry attempts as a value between 0 and 10.

proxy-conn-retry-interval 100..2000

Set the number of milliseconds to wait between proxy connection retry attempts. This is a value between 100 and 2000.

nvos-debug-logging|no-nvos-debug-logging

Logging mode selection (Direct OR viz. nvlog demon)

manage-l2-uuc-drop|no-manage-l2-uuc-drop

Enable or disable L2 UUC (Unknown Unicast Drop) towards data port.

xcvr-link-debug|no-xcvr-link-debug

Enable or disable system debug to capture link information.

fastpath-bfd|no-fastpath-bfd        

Enable or disable BFD fastpath. This feature is disabled by default.

linkscan-interval 10000..1000000

Specify the linkscan interval as a value between 10000μs and 1000000μs. The default value is 150000μs.

linkscan-mode software|hardware

Specify the linkscan mode as hardware or software. Software linkscan mode is enabled by default.

single-pass-flood|no-single-pass-flood

Enable or disable single-pass flood.


For example, use the command below to enable BFD fastpath:


CLI (network-admin@switch) > system-settings-modify fastpath-bfd


This command creates a new vFlow which redirects all BFD packets to CPU through the PCIe link.


To see the status of BFD fastpath on a switch, use the command system-settings-show. For example, to view the BFD fastpath status exclusively, use the command:


CLI (network-admin@switch) > system-settings-show format fastpath-bfd


fastpath-bfd: off


Netvisor ONE has the transmission queue tx-class-inband-bfd for sending out BFD packets. For reception, the rx-bfd queue is used.


To view the details of the transmission queue, use the command:


CLI (network-admin@switch) > nv-queue-stats-show name tx-class-inband-bfd


To view the receiver queue details, use the command:


CLI (network-admin@switch) > nv-queue-stats-show name rx-bfd


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