This article provides guidance on configuring core anchoring and assigning specific worker threads to handle traffic from designated traffic classes.
In VoS (Versa Operating System), there are four traffic classes enabled by default: Network Control (NC), Best Effort (BE), Expedited Forwarding (EF), and Assured Forwarding (AF). Typically, worker thread 0 is mapped to handle both CC0 (NC) and CC3 (BE) traffic. However, in some specific scenarios where worker-0 becomes heavily burdened with BE traffic, We need to safeguard the network control traffic.
To address above explained scenario, we can optimize the default core profile by dedicating worker-0 exclusively to process CC0 (NC) traffic, while offloading the other traffic classes to other available worker threads. This ensures more efficient processing of control traffic and enhances control connections stability.
You can configure core profile form device template->others->system->Configuration->Core Profile
admin@SDwan(config)% show system core-profile
core-profile default-profile {
core-class {
core-classes cc0 {
wt-list [ wt0 ];
}
core-classes cc1 {
wt-list [ wt1 wt2 wt3 wt4 wt5 wt6 wt7 ];
}
core-classes cc2 {
wt-list [ wt1 wt2 wt3 wt4 wt5 wt6 wt7 ];
}
core-classes cc3 {
wt-list [ wt1 wt2 wt3 wt4 wt5 wt6 wt7 ];
}
}
}Once above configuration is committed, all the existing sessions which are already anchored to a worker threads won’t move until the sessions are cleared. All new sessions will follow the new core anchoring profile configured.
Note: This core anchoring profile requires be attached to a QOS-Policy rule. If there are no existing rules or if the configuration only has App-Qos then you can create a wildcard BE rule and match all the BE traffic.
You can use below vsmd vty command to verify the stats.
vsm-vcsn0> show vsm cq stats
+-------+-------------+-------------+-------------+-------------+
| W TID | CTRL | DATA | EF | AF |
+-------+-------------+-------------+-------------+-------------+
| 0 | 1311617 | 0 | 0 | 0 |
| 1 | 0 | 0 | 0 | 0 |
| 2 | 0 | 594967 | 0 | 0 |
| 3 | 0 | 192857 | 0 | 0 |
| 4 | 0 | 13456 | 18765 | 15234 |
| 5 | 0 | 14789 | 13987 | 19432 |
| 6 | 0 | 15873 | 17234 | 11654 |
| 7 | 0 | 19456 | 16342 | 10987 |
+-------+-------------+-------------+-------------+-------------+