QOS

Jody — Thu, 04 Mar 2021 00:09:23 GMT

Hi all,

I’d like some clarification if at all possible with our QoS setup on our EXOS switches. They’re running different models of G1 and G2 but the QoS is the same across all.

We need to prioritize our VoIP traffic across the LAN and the QoS was originally setup by an EXOS ‘guru’.

Something doesn’t look quite right to me coming from a Cisco background so as I say it’s just clarification really.

We use Cisco IP phones and these are set on the call manager to use DSCP (as far as I know). The phones then setup using lldp on the switches.

Here’s a bit of config from one of our switches, although dot1p examination is disabled, should diffserv examination be disabled too?

disable dot1p examination port 1:1
disable dot1p examination port 1:2
disable dot1p examination port 1:3
disable dot1p examination port 1:4
disable dot1p examination port 1:5
disable dot1p examination port 1:6

configure qosprofile QP6 maxbuffer 100 weight 1
configure qosprofile QP6 minbw 0 maxbw 100 ports 1:1
configure qosprofile QP6 minbw 0 maxbw 100 ports 1:2
configure qosprofile QP6 minbw 0 maxbw 100 ports 1:3
configure qosprofile QP6 minbw 0 maxbw 100 ports 1:4
configure qosprofile QP6 minbw 0 maxbw 100 ports 1:5
configure qosprofile QP6 minbw 0 maxbw 100 ports 1:6

configure diffserv examination code-point 24 qosprofile QP6
configure diffserv examination code-point 46 qosprofile QP6
configure diffserv replacement priority 5 code-point 46

configure access-list voip ports 1:1 ingress
configure access-list voip ports 1:2 ingress
configure access-list voip ports 1:3 ingress
configure access-list voip ports 1:4 ingress
configure access-list voip ports 1:5 ingress
configure access-list voip ports 1:6 ingress

entry VOIP_COS_5{
if {
dot1p 5;
} then {
qosprofile qp6;
replace-dot1p;
count voip_cos_5
}
}

entry VOIP_COS_3{
if {
dot1p 3;
} then {
qosprofile qp6;
replace-dot1p;
count voip_cos_3
}
}

entry VOIP_rtp{
if {
dscp 46;
} then {
qosprofile qp6;
replace-dscp;
count voip_rtp;
}
}

entry VOIP_data{
if {
dscp 24;
} then {
qosprofile qp6;
replace-dscp;
count voip_data;
}

topic QOS in ExtremeSwitching (EXOS/Switch Engine)

QOS