Alcatel-Lucent 7750 Configuration Manual page 557

stable-pool-sizing
Syntax [no] stable-pool-sizing
Context config>card>fp
Description
The stable-pool-sizing command is used to provide a stable buffer pool allocation environment for all
default port buffer pools on a forwarding plane. This stable environment is provided at the expense of opti-
mal buffer allocation between the various port buffer pools. Normally, port pools are sized according to a
ports relative bandwidth with other ports and the ability of a port to use pool buffers. As an example, on a
forwarding plane with two potential MDAs and only one equipped, the normal behavior is to provide all
available default pool buffers to the ports on the currently equipped MDA. If a second MDA is equipped in
the future, buffers are freed from the existing MDA and provided to the ports on the new MDA. Stable pool
sizing alters this behavior by reserving buffers for both MDAs whether they are equipped or not thus pre-
venting a resizing event when an MDA is equipped. In addition, existing ports on a module always receive
their maximum bandwidth share of buffers independent on any sub-rate condition that may currently exist.
This provides a stable amount of buffers to other ports on the module independent of link or configuration
events that may occur on the port.
Stable pool sizing preserves the ability to modify the effective bandwidth used to determine a port's relative
share of the available buffers through the use of the ing-percentage-of-rate and egr-percentage-of-rate com-
mands under the port configuration. Changing the values associated with these commands will cause a
reevaluation of buffer distribution and thus a possible resizing of pools on each port within the module.
These commands have no effect on ports associated with other modules on the forwarding plane.
Stable pool sizing is mutually exclusive with card level named-pool-mode. Named pool mode must be dis-
abled and not operational before stable pool sizing can be enabled. Once stable pool sizing is enabled on any
forwarding plane on a card, named-pool-mode cannot be enabled for that card.
Stable pool sizing may be enabled (while named pool mode is disabled) or disabled at any time on a for-
warding plane. The system will dynamically change the pool sizes according to the stable pool sizing state.
The no stable-pool-sizing command is used to disable stable pool sizing on a forwarding plane. Existing
buffer pools will be resized according to normal pool sizing behavior.
access
Syntax access
Context config>card>fp>ingress
Description This CLI node contains the access forwarding-plane parameters.
queue-group
Syntax queue-group queue-group-name instance instance-id [create]
no queue-group
Context config>card>fp>ingress>access
7750 SR Interface Configuration Guide
Interface Configuration
Page 557