# show mls qos interface gigx/x/x statistics.ġ) Cos values only generated by cisco phones if I marked my softphone with DSCP value of 46 and 26 will I really need to change cos-dscp table. If its a true wan interface on egress you should be using some form of 元 qos with policy-maps, if its like metro wan but still L2 and just your devices directly connected to each other you can still use mls qos each side but make sure your ISP is just passing it through and not remarking, either way i would span each side to be sure nothings been re-marked, when your phone marks the packet with 46 depending on which side the phone is on whether you would see it incoming or outgoing but if there speaking to each other over a call you should see both counters increment Iv) which traffic should i consider when it moving out from network WAN links(point-to-point), should i consider dscp-incoming or dscp-outgoing when you put a command on wan interface. Iii) I used DSCP 26 marking at source(i.e., on SoftPhone) is it really required for signalling.įor Cisco phones you should match for 24 and 26 for best practice as some phones use either, i wouldn't be familiar though with your product but when you deploy auto qos on certain platforms you will see Cisco by default has marked for both values Not sure would need to check this, i usually just make sure my dscp incoming and outgoing are incrementing correctly, you could check by clearing counters on test interface and just connect a phone thats marking, you should see which queue it hits Ii) when you trust DSCP at port level which queue it uses when you see mls qos queuing statistics on 3750. This link may help explain it with some examples. If your talking about the percentages given to each queue that's showing in the global config that appears when you enable mls qos looks at the queue-set output. The phones if marking or your manual markings decide what goes through first. I) so what is the percentage of bandwidth it uses when you enable mls qos globallyĮnabling Qos does not use any bandwidth it just marks the packet and makes sure that certain packets are prioritized before others.Qos only comes into effect really when the interface is running near maximum and you want to make sure your voice packets for example are not stuck buffering behind some ftp download due to it being real time traffic. Thanks in My SitesA,B,C,D are connected through Point-to-Piont links with each links has 40Mbps bandwidth. Please find the attachment for your reference. Please let me know what configurations need to be done to ensure that my dscp marking has working perfectly across the network. When I see QoS maps I found the below table where I cannot see the DSCP 46 and 26 values.ġ) Cos values only generated by cisco phones if I marked my softphone with DSCP value of 46 and 26 will I really need to change cos-Dscp table.Ģ) How do I ensure my data is travelling across the sites is marked with DSCP.ģ) I saw the mls QoS interface statistics which is bit confused in some ports I saws traffic generating at dscp-incoming and dscp-outgoing at 26 and 46 columns.Īnd there are other values of the tables which are also generating traffic. (Config-if)# mls QoS trust dscp ( Trusting Swicth Port With DSCP)ġ0) My Voice server is locate at SITE B and all the ports at SITE B end configured to trust DSCP values I have been assigned to configure QoS on 3750.ġ) All access layer 2960 switches are terminated on 3750Ģ) End users are connected to 2960 as you now it access layer switch.Ĥ) All the sites are connected through Point-to-Point links in full mesh.ĥ) and all these Point-to-Point links are terminated on 3750 switch on each SITE.Ħ) Now on Site A we have call center with 100 users.ħ) We are using X-lite soft phone which works with Asterisk server(Open Source VOIP Server).Ĩ) As there is no voice priority we have used windows group policy to mark all the voice data with DSCP which is generated by X-lite softphone.ĩ) We also observed all the softphones are generating voice RTP packets with DSCP value of 46 and Singling with 26 as per our configurations.ĩ) and we have also configured end to end cisco switches with
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