Knowledge Base

How does the Zyxel switch handle traffic with marked ToS field?

Question

We have an environment with traffic carrying different types of services (ToS) fields.

What happens if the Zyxel switch receives traffic carrying ToS 160? How does it handle or prioritize these traffic?

Answer

The ToS Field is used for differentiating services across networks. The Zyxel switch handles traffic with ToS fields by checking its DSCP value, then allocating this to the appropriate queue. As a reminder, priority queuing only occurs during congestions.

In this example, we see an ICMP packet marked with ToS 160 (1010 00 00). By ignoring the last two bits, ToS 160 is equivalent to DSCP 40 (1010 00 00).

Now that the DSCP value has been determined, we map it with the corresponding queue in IP Application > Diffserv > DSCP setting:

Now that we determined that ToS 160 is using Priority 5, we now turn to Basic Setting > Switch setup to verify its corresponding Queue:

 

And finally, go to Advance Application > Queuing Method to determine how traffic is prioritized during congestion.



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