Resource Allocation For Network Qos Policy - Alcatel-Lucent 7210 SAS M OS Quality Of Service Manual

Service Management Tasks

Resource Allocation for Network QoS policy

This section describes the allocation of QoS resources for network QoS policy (for type=ip
interface only).
When an IP interface is created, a default network QoS policy is applied. For the default policy,
two meters and two classification entries in hardware are allocated.
The resources are allocated to a network policy, only when a port is configured for the IP interface.
For every FC in use, the system allocates two classification entries in hardware. If multiple
matchcriteria entries map to the same FC, then each of these are allocated two classification entries
in hardware. For example, if there are two match-criteria entries that map to FC 'af', then a total of
four classification entries are allocated in hardware and if there are four match-criteria entries that
map to FC 'af', then a total of 8 classification entries are allocated in hardware.
For every meter or policer in use, the system allocates one meter in hardware. A meter or policer is
considered to be in use when it is associated with an FC in use.
The number of IP interfaces allowed is limited to number of resources available in hardware,
subject to system limit ( a maximum of 64 IP interfaces are allowed). The system reserves a total
of 512 classification entries and 256 meters in hardware for use by network policy associated with
an IP interface.
For computing the number of QoS resources used by an IP interface:
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•
Only the FCs used by the match-criteria classification entries are to be considered for the 'number
of FCs'. Therefore are referred to as 'FC in use'.
Use the following rules to compute the number of classification entries per FC in use:
If a FC is in use and is created without explicit meters, use default meter#1 for unicast traffic and
default meter #9 for all other traffic types (that is, broadcast, multicast and unknown-unicast). This
requires two classification entries in hardware.
If a FC is in use and is created with an explicit unicast meter, use that meter for unicast traffic and
use default meter #9 for all other traffic types. This requires two classification entries in hardware.
If a FC is in use and is created with an explicit unicast meter and explicit multicast meter, use the
unicast meter for unicast traffic and multicast meter for all other kinds of traffic. This requires two
classification entries in hardware.
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Determine number of match-criteria entries used to identify the FC.
Determine number of FCs to use.
7210 SAS M OS Quality of Service Guide