Wireless/Redundant Edge Services xl Module Management and Configuration Guide WS.02.xx and greater

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Introduction
ProCurve Wireless Edge Services xl Module
For instructions on establishing GRE tunnels, see Chapter 12: Configuring
Tunnels with Generic Routing Encapsulation.
Note The Wireless Edge Services xl Module also establishes tunnels with other
members of a Layer 3 mobility domain (see “Roaming Between RPs on
Different Wireless Edge Services xl Modules at Layer 3” on page 1-83). How-
ever, these tunnels are created automatically when you set up the Layer 3
mobility domain.
Traffic Management and QoS
In the past, users often treated wireless connections as a supplement to other
network connections. Now, users demand more and more from wireless
connections, increasing congestion and decreasing QoS.
Compounding the problem, users have begun to demand the same applications
to which they have become accustomed on Ethernet connections. As multime-
dia applications become more common in wireless networks, maintaining a
high QoS for such time-sensitive, bandwidth-intensive traffic becomes a prior-
ity. Voice-over-WLAN (VoWLAN) wireless phones further complicate the situ-
ation with yet another type of traffic that requires special handling.
A wireless network, which uses the shared medium of radio signals, functions
differently from a switched Ethernet network. On a wireless network, colli-
sions can occur, bandwidth can be reduced, and latency can be high. A
wireless QoS solution must address these issues.
The Wireless Edge Services xl Module manages wireless traffic with several
QoS mechanisms, ensuring that each type of traffic receives the necessary
level of service. The module supports the following QoS protocols, which you
can enable on a WLAN-to-WLAN basis:
■ SpectraLink Voice Priority (SVP)
■ priority queuing based on WMM or on a WLAN classification
These protocols improve QoS in the wireless network. You can also configure
the module to mark traffic outbound to voice stations for high priority. Called
Voice prioritization, this feature improves the QoS for traffic destined to
wireless stations, as the traffic travels through both the Ethernet network and
the wireless network.
Finally, the Wireless Edge Services xl Module can implement weighted fair
queueing (WFQ) on traffic destined from the module to RPs.
Figure 1-16 illustrates which traffic is affected by each QoS mechanism.