Specifications

OmniAccess 5510 USG - Release Notes
September 2010
Hierarchical Queuing
Hierarchical Queuing provides a mechanism of controlled sharing of excess bandwidth in a
hierarchical fashion. One can configure the hierarchical policy, which supports currently three level of
packet classification. QoS manager will check all the constraint of the HPC and will maintain the
database. Hierarchical Queuing is not supported on ATM interface.
Qos Pre-classify (QoS policies on tunneled/encrypted packets)
It classifies the packet based on the pre_tunnel ip-header and stores the classification index. This
index is later used by QoS to classify the packet based on the inner tunnel header.
QoS on FR
One of Frame Relay's main benefits is that it makes a pool of bandwidth available to many VCs.
However, there is a danger that some applications consume all of the available bandwidth leaving
nothing or only small amount of bandwidth to other applications. To prevent this, FR interface has to
be configured with QoS. The purpose of QoS is to provide fair access to the network's bandwidth by
all the user applications and ensure that the key applications are not starved of required bandwidth.
ATM QoS
ATM networks are thought to transmit data with varying characteristics. Different applications need
various QoS. Some applications like telephony may be very sensitive to delay or rather insensitive to
loss, whereas others like compressed video are quite sensitive to loss. In this situation, it becomes
important to ensure that time-critical applications do not suffer. This can be achieved by configuring
QoS.
Routing Protocols
RIPv1\RIPv2
RIP uses User Datagram Protocol (UDP) data packets to exchange routing information. The routing
information updates are sent at regular time intervals (by default, 30 seconds in Alcatel-Lucent’s
implementation). If the router does not receive any updates from a neighboring router for a time
interval known as the valid timer, it marks all routes from the neighboring router as invalid. And if
there is still no sign of life from the neighboring router after the router’s flush timer has expired, all
the routes are removed.
RIP uses hop count as metric and the max metric is 15. A metric of 16 means the network is
unreachable; a metric of 0 means the network is directly connected.
A default route can be received from another RIP router or it can source the default route itself. In
both the cases, the default route is advertised to other RIP routers via RIP. A default route can be
sourced either with the default-information originate command or from another routing protocol via
redistribution.
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