![]() I recommend being careful here if you have voice devices on 2.4 GHz that support TSPEC.Ī notable difference between Fastlane CAC and the recommended CAC settings for Cisco voice is the max bandwidth setting. Load-based CAC will reject a lot of calls on 2.4 GHz due to the normally higher channel utilization values. Load-based CAC is enabled for Voice on both bands, which is a little suspect. Enabling CAC for the Voice AC will limit client access to the Voice AC to devices that support TSPEC and iOS devices that support Fastlane. Next in the list is Call Admission Control for Voice. There are many more rules in this set, some of which punish apps like Netflix and BitTorrent with very low DSCP values. Changes the EDCA profile on both 802.11b and 802.11a networks to a built-in profile called Fastlane. ![]() Enables QoS Map, Trust DSCP upstream, and creates a DSCP to UP exception map.This differs from the default value of 75%, which is the recommendation when configuring for Cisco phones. Load-based CAC is selected, with maximum bandwidth for Voice set at 50%. Enables Admission Control Mandatory for the Voice AC on both 802.11a and 802.11b networks.Enables AVC on the WLAN, and maps an automatically-created AVC profile to the WLAN.To preserve Voice DSCP markings, the WLAN's QoS profile must be set to Platinum. Remember that the QoS profile acts as a limiter on the QoS markings upstream and downstream between the controller and the APs. The QoS profile for the WLAN is set to Platinum.Here is an overview of what happens when you enable Fastlane on a WLAN. This ensures that CAPWAP tunnels packets between the AP and controller are marked with the appropriate DSCP values across the wired portion of the network.įastlane configuration is focused on tuning QoS settings for a WLAN, but there are also changes to the entire wireless network. In addition, the APs and upstream WLC will preserve any inner DSCP markings on IP packets from iOS devices. Fastlane is basically a hack that allows iOS devices to access the Voice AC in a non-standard way. If you have worked on Cisco wireless networks that support phones like the 7925 or 8821, you may be familiar with TSPEC, which is a method that wireless devices use to reserve bandwidth when accessing the Voice AC on a network where Admission Control Mandatory (a.k.a CAC) is enabled. The main idea of Fastlane is to allow certain apps on an iOS device to send traffic with Voice Access Category (AC) on a network with Call Admission Control without having to use TSPEC. This partnership came about because of the increase in the use of mission-critical applications like Jabber and Citrix on iOS 10 devices. It is part of a suite of features that resulted from the Cisco and Apple partnership that includes Adaptive 802.11r, and robust 11k/v support on iOS devices. Introduced with 8.3 firmware, Fastlane is a set of configuration changes that tune the wireless network for iOS 10 devices. If you run a Cisco wireless network, chances are you have heard about Fastlane for iOS.
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