Hi, I would like do use Priority Queuing for voice on the OUTSIDE interface. As far as I know the QOS meganism only kicks in when there is congestion on the interface. But my ASA 5505 is connected to a 80mbps down and 10 mbps up cable modem. How can I tell the ASA that it is not connected to an interface with 100/100 mbps bandwidth?
On a router I would use the bandwidth command, but this is not available on the ASA as far as I know.
You are correct.
Traffic shaping is used to match device and link speeds, thereby controlling packet loss, variable delay, and link saturation, which can cause jitter and delay.
Example: Shaping outside interface traffic to 2 Mbps and provide priority queueing for VoIP traffic that is tagged with DSCP EF and AF13:
match dscp EF AF13
shape average 2000000 16000
service-policy qos_outside_policy interface outside