Interfaces
Page 500 7750 SR Interface Configuration Guide
Context config>lag
Description This command enables the context to configure access parameters.
adapt-qos
Syntax adapt-qos {link | port-fair | distribute [include-egr-hash-cfg]}
Context config>lag>access
Description This command specifies how the LAG SAP queue and virtual scheduler buffering and rate parameters are
adapted over multiple active XMAs/MDAs. This command applies only to access LAGs.
Default distribute
Parameters type — Specify the QoS adaptation type.
Values link — Specifies that the LAG will create the SAP queues and virtual schedulers with the
actual parameters on each LAG member port.
port-fair — Places the LAG instance into a mode that enforces QoS bandwidth
constraints in the following manner:
—all egress QoS objects associated with the LAG intance are created on a per port basis
—bandwidth is distributed over these per port objects based on the proportion of the port's
bandwidth relative to the total of all active ports bandwidth within the LAG
—the include-egr-hash-cfg behavior is automatically enabled allowing the system to
detect objects that hash to a single egress link in the lag and enabling full bandwidth for
that object on the appropriate port
distribute — Creates an additional internal virtual scheduler per IOMXCM as parent of
the configured SAP queues and vitual schedulers per LAG member port on that
IOMXCM. This internal virtual scheduler limits the total amount of egress bandwidth for
all member ports on the IOMXCM to the bandwidth specified in the egress qos policy.
include-egr-hash-cfg — Specifies whether explicitly configured hashing should factor
into the egress buffering and rate distribution.
When this parameter is configured, all SAPs on this LAG which have explicit hashing
configured, the egress HQos and HPol (including queues, policers, schedulers and
arbiters) will receive 100% of the configured bandwidth (essentially operating in adapt-
qos link mode). For any Multi-Service-Sites assigned to such a LAG, bandwidth will
continue to be divided according to adapt-qos distribute mode
A LAG instance that is currently in adapt-qos link mode may be placed at any time in
port-fair mode. Similarly, a LAG instance that is currently in adapt-qos port-fair mode
may be placed at any time in link mode. However, a LAG instance in adapt-qos distribute
mode may not be placed into port-fair (or link) mode while QoS objects are associated
with the LAG instance. To move from distribute to port-fair mode it is necessary to
remove all QoS objects from the LAG instance.
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