Specifications

OmniAccess 5510 USG - Release Notes
September 2010
License Manager
Some of the features on the OmniAccess 5510 USG are license enabled. Hence they require a license
to function. These licenses regulate the availability of a licensable feature at all times. These licenses
are contained in a set of license files that will describe the features authorized to run on the
OmniAccess 5510 USG. License Manager helps in managing these license files.
Quality of Service (QoS)
QoS generally involves prioritization, queuing, and shaping of network traffic. A network monitoring system
must typically be deployed as part of QoS to insure that networks are performing at the desired level. QoS
supports voice and data service simultane
ously on OmniAccess 5510 USG. This includes controlled
resource sharing by providing bandwidth guarantee for different classes. It also provides features that make
QoS configuration simpler by means of Auto QoS commands.
OmniAccess 5510 USG supports both ingress and egress QoS processing. Ingress packets are classified using
common classifiers, and exploit the one-pass classification feature on OmniAccess 5510 USG. QoS can be
configured on Fast Ethernet, ATM, Tunnel and VLAN interfaces.
Supports L2 QoS. An interface can have both L2 and L3 policy map attached in the ingress direction, and only
L2 or L3 policy map attached in the egress direction.
Egress Queues
Interface Egress Queues come into effect at the interface level and hold the packets that are in excess
of the available bandwidth and are yet to be transmitted out in the network. The maximum length of
queue is configurable within a specified range.
Traffic Policing
Dropping or marking packets in order to make traffic stay below a configured bandwidth. Thus
defined, a traffic policing do not remove traffic burst, but controls the size of the peak.
Policing is done using Token Bucket Algorithm. A token bucket is a formal definition of a rate of
transfer. It has two mandatory parameters like mean rate, burst size and can have optional parameter
of peak rate and excess burst size. The traffic received on a flow that is to be policed is examined. The
rate of the traffic is compared to a configured token bucket and action is taken based on the result.
When sufficient number of tokens is available then the arriving traffic is said to confirm and then the
corresponding number of tokens are removed from the bucket. If there are not enough tokens, then the
traffic is said to exceed.
Weighted Fair Queuing
It is a packet scheduling technique allowing guaranteed bandwidth services.
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