Queue Sets; Table 4: Ethernet Routing Switch 5500 Resource Sharing - Avaya ERS 5510 Technical Configuration Manual

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4. Queue Sets

Prior to soft ware releas e 4.0, the Ethernet Routing Switch 5500 support ed a single queue set with eight
queues, one absolut e queue and seven WRR queues.
With the introduction of software release 4.0, eight different queue sets where made available. Each
queue set has different characteristics in regards to number of queues and service weights allowing the
user to select a queue set based on the user‟s particular needs. With eight queue settings and three
resource sharing options, the Ethernet Routing Switch 5500 supports a total of 24 different queues and
buffer setting combinations. Prior to making any changes to the egress queue, the buffer resource
sharing feature must be enabled.
Resource Sharing
The three (3) possible resource sharing settings in version 4. 0 or greater software release are regular,
large, and maximum. These settings allow the user to change the amount of buffer which can be
allocated or shared to any port. Note that the switch must be rebooted if any changes are made.
Table 4: Ethernet Routing Switch 5500 Re source Sharing
Setting
Regular
Large
Maximum
Resource Sharing Commands
5520-24T-PWR(config)# qos agent buffer <large | maximum | regular>
The qos agent buffer <regular | large | maximum > command allows the user to specify the level
of resource sharing on the switch. This parameter is global and requires a reset to activate a
change. This command is in the CLI priv-exec mode.
5520-24T-PWR(config)# default qos agent buffer
The default qos agent buffer command sets the switches agent buffer back to a default setting of
regular. In order for this command to take affect, a reset of the switch must occur. This
command is in the CLI priv-exec mode.
Resource Sharing Recommendations
A vaya recommends you use the default resource-sharing setting of regular. If you
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change the setting, the resulting performance may increase for some ports, and at
times, decrease for other ports.
Generally speaking, smaller buffers achieve lower lat ency (RTT) but reduce the throughput ability which is
better for VoIP etc. and sensible jitter application.
You should use the Maximum resource sharing setting:
Filters and QOS Configuration for Ethernet Routing Switch 5500
January 2013
Description
1 port may use up to 16% of the buffers for a group of 12 ports.
1 port may use up to 33% of the buffers for a group of 12 ports.
1 port may use 100% of the buffers for a group of 12 ports.
Technical Configuration Guide
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