Overview
722 Quality of Service Guide
Buffer allocation rate modification is supported for both standard and named pool mode
buffer allocation methods.
The system allocates buffers based on the following criteria:
• “named-pool-mode” setting on the IOM.
• Amount of path bandwidth on channelized ports.
• Existence of queues provisioned on the port or channel.
• Current speed of each port.
• Each ports “ing-percentage-of-rate” and “egr-percentage-of-rate” command setting.
• The port-allocation-weights setting for default, XMA or MDA, and port.
• The ports division between network and access bandwidth.
• Each individual named pool’s network-allocation-weight and access-allocation-
weight.
System reserved named pool names (cannot be used when configuring a named pool) are:
default, SAP Shared and MC Path Mgmt.
Named Pool Mode for IOM3-XP Card
IOM3-XP has one forwarding complex for MDA1 and MDA2. The total available buffer
space is divided in the ingress and egress direction. The total ingress buffer space is shared
by both MDAs in the ingress direction and the total egress buffer space is shared by both
MDAs in the egress direction.
Each XMA or MDA can use a different named pool policy.
Network ingress queues can only use the MDA1 named pools. If named pools are configured
for MDA2 they will not be used by network ingress queues. Network ingress queues
configured to use MDA2 named pools will be considered pool orphaned. To check for orphan
queues, use the command show mda mda qos ingress orphaned-queues. The same
restriction applies for SAP shared queues using named pools.
Each named pool policy can have a maximum of 57 named pools configured.
The total number of named pools that can be configured per IOM3 is 245. The named pool
usage per card can be checked with the tools dump resource-usage card 1 all | match pools
command.
*A:PE# tools dump resource-usage card 1 all | match "Named Pools"
Dynamic Q2 Named Pools 245 0 245
Dynamic Q2 Named Pools (in use by Ingress) 0
Dynamic Q2 Named Pools (in use by Egress) 0
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