How does the ESW 500 or SF300 line guarantee QoS of voice traffic when trunking switch to switch? I have (2) ESW 500 series switches in series. The phone on switch 1 have no audio issues, but the phones on switch 2 (the last in the series) have intermittent voice quality issues when dialing across a WAN circuit to another office. The phone on switch 1 do not have that issue though they traverse the same circuit. They are all using the same VLAN 100.
Bill, I can see from my SG300 GUI, that I have basic QOS enabled with strict priority queuing and the switch will trust DSCP. I am happy with that technique as my SPA phones do utilize DSCP as a marking that switch recognizes. as well as that smartports automatically apply QOS techniques to voice traffic.
So I know that these packets will egress from my SG300-10P before other data packets.
But to improve the chances of certain traffic egressing out a switch port uplink to a router, there are techniques that could be used to achieve that objective.
They include the use of;
smartports - done automatically when connected to UC500 or Uc300, if you are using recent firmware.
specifying via CCA in the UC500 which vlan is a voice VLAN .
basic or advanced QOS
traffic shaping and marking ...bla bla it goes on and on
Might i suggest you look at a excellent tech note by Ivor that tries to explain this complex topic;
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