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Understanding QoS Configuration on the Matrix N-Series
•
Optionally, specify port‐group Name, associated ports, and arb‐percentage or arb‐slices
Port-Groups: IRL Configuration
IRL Port‐Groups contain user settings for specific types of ports and their matching inbound rate
limiting configurations. Port groups 0.0 and 0.1 exist by default. Each new group can be
configured with a name and ports added to each group according to device port‐type. Use the
show cos port‐config irl command to display each IRL port‐group configured by group and type,
with group name and associated ports.
The following example displays default values for the show cos port‐config irl command output:
Matrix(su)->show cos port-config irl
Inbound Rate Limiting Port Configuration Entries
----------------------------------------------------------------------
Port Group Name
Port Group
Port Type
Assigned Ports
----------------------------------------------------------------------
Port Group Name
Port Group
Port Type
Assigned Ports
----------------------------------------------------------------------
Additional port groups can be created using the set cos port‐config irl command. Port group
name and associated ports can be configured. You need to:
•
Identify the port‐group for configuration
•
Optionally, specify port‐group Name and associated ports
Configuring CoS Port-Resource
Physical rate limiters and rate shapers are configured in CoS port resources. Resources map
directly to the number of queues and rate limiters supported by each port‐type. Remember, group
0.0 supports 16 TxQ resources and 32 IRL resources while group 0.1 supports 4 TxQ resources and
8 IRL resources. Resources exist for each port group and are indexed as port‐group.port‐type
resource‐index. Port‐resources initially default to none, as rate limiting and shaping is not required.
CoS TxQ Port-Resource (Outbound Rate Shapers)
Rate shaping throttles the rate at which queues transmit packets. See Rate Shaping on page 8 for a
general discussion of rate shaping. Rate shaping is TCP friendly; it buffers packets that are above
the rate rather than drop them. CoS rate shaping allows you to configure rate shapers based on a
unit rate (kilobits/second, megabits/second, gigabits/second), or a percentage of the port's line
speed.
The show cos port‐resource txq command displays resources for each port group created along
with the resource index (physical queue). By default, no resources are configured for TxQ
port‐resources. Rates displayed as none indicate no resources exist. The default Rate Shaping
algorithm is tail‐drop and is not configurable.
February 22, 2008
:DFE-P 32 IRL
:0
:0
:ge.3.1-12;ge.4.1-9
:DFE-P 8 IRL
:0
:1
:ge.1.1-18;fe.2.1-48;ge.5.1-60;ge.6.1-30;ge.7.1-30
Page 13 of 29
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