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Overview
Use of Index file by SAP QoS Ingress policy (applicable for both 7210 SAS-X
and 7210 SAS-R6)
7210 uses an index file to store the map which indicates the QoS resource allocation to SAPs. This
file is used on reboot to ensure that all the SAPs that were created successfully before reboot can
be created again on a reboot. Without an index file the system does not ensure this (that is, without
an index file it is possible that all the SAPs that were configured successfully, may fail on a reboot
after saving the configuration file). The file is stored in the flash. On reboot if the file is found, the
system allocates resources as per the stored map. If the file is not found the system implements a
best-fit algorithm and tries to allocate resources for all the SAPs on a first-come-first-served basis
(Note : There is no guarantee that resources will be allocated to all SAPs). Hence, when the file is
not present it is possible that configuration saved, does not execute successfully after the reboot.
NOTE: The index file used for QoS map is different from the one used for storing Interface
indexes.
Use of the keyword "multipoint" for default meter "11"
The system allows sharing of a single meter for both unicast and multipoint traffic. The user can
configure any of the available meters for multipoint traffic. The use of 'multipoint' keyword during
meter creation is deprecated, except for use with meter "11" as described in the following
paragraphs.
When the "multipoint" keyword is specified with meter "11" the software interprets it to be the
default multipoint meter. The default multipoint meter is used for all FCs that do not have explicit
multipoint meters configured.The software does the appropriate resource checks to ensure that
resources needed to use multipoint meter with all the FCs are available before allowing this
change.
Note 1: When num-qos-resources is set to a value of '2', default multipoint meter "11" cannot be
used as only a single meter is available for use.
Note 2: When associating a meter with a FC for BUM traffic, the software does not validate if the
meter is a multipoint meter thus allowing user to use a single meter for unicast and BUM traffic.
This implies efficient use of SAP ingress qos resources.From release 4.0R4 onwards when the
"multipoint" keyword is used, software throws a warning indicating that it is an obsolete CLI
command and it is not saved in the configuration file deprecating the use of multipoint keyword
with any meter other than the default.
Examples of usage of multipoint meter:
Example 1:
Page 202
7210 SAS-X and 7210 SAS-R6 OS Quality of Service Guide
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