AdTran proper QoS implementations

[hibbin]

Hi,

We wanted to make sure our QoS implementations were sound, so I was hoping for some feedback on what we have. We are hoping for 65% bandwidth allocation for the RTP @ a dscp of 40 and 10% bandwidth allocation for SIP signaling @ a dscp of 48. The ACLs will specify what traffic should be prioritized by either IP address for RTP or port (5060) for SIP traffic. We do send traffic to the AdTran from our core (using mlppp with a ta5k) with the same values, but wanted to be sure that if packets were received with no priority and it fell into these categories, that said packet would be marked or set. As a general practice the TA900 is *usually* the sole source or termination of the voice traffic at the Z end of the circuit (ie passing voice thru one TA900 to another voice gateway) but we do have a few scenarios where we install additional voice equipment hanging off the ethernet port(s). Example: t1 --to--> ta900e w/ analog lines --to--> SBC

Config currently looks as follows:

!

qos map VOICE 0

match list SIP

set dscp 48

priority percent 10

qos map VOICE 1

match list VOIP

match dscp 40 cs5

set dscp 40

priority percent 65

!

int ppp 1

description "Connection to TA5000"

ip address x.x.x.x x.x.x.x

bandwidth 1524

media-gateway ip primary

qos-policy out VOICE

cross-connect 1 t1 0/1 1 ppp 1

!

ip access-list extended VOIP

permit ip any (destination RTP IPs/subnet here)

permit ip (source RTP IPs/subnet here) any

!

ip access-list extended SIP

permit udp any  any eq 5060

!

ip sip qos dscp 48

!

ip rtp qos dscp 40

Thanks for any feedback!

[Anonymous · Accepted solution]

Hello and thanks for posting to our forum!!!

Your configuration looks fine.  It may be worth noting that by default, AOS voice products will tag generated rtp with DSCP 46, so we typically use DSCP values of 46 for rtp and 26 for sip.  Right now, the ADTRAN will match list VOIP OR match cs5 OR DSCP 40 and on any of those matches it will set the DSCP to 40.

Also note that the set command will work outbound on the interface in which the QoS map is applied. 

You can issue the command: show qos map int ppp 1 to see if packets in the QoS map are being matched.

Best Regards,

Geoff

[hibbin]

Thanks Geoff. Yeah, we use dscp 40/48 on our network which is why I wanted to include we were changing from the default in the config I posted. Appreciate your feedback.

p.s I like the new support forums.

-Nathan