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Catalyst 3750-E and 3560-E Switch Software Configuration Guide
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Chapter 37 Configuring QoS
Configuring Standard QoS
•
Incoming traffic is classified, policed, and marked down (if configured) regardless of whether the
traffic is bridged, routed, or sent to the CPU. It is possible for bridged frames to be dropped or to
have their DSCP and CoS values modified.
•
Follow these guidelines when configuring policy maps on physical ports or SVIs:
–
You cannot apply the same policy map to a physical port and to an SVI.
–
If VLAN-based QoS is configured on a physical port, the switch removes all the port-based
policy maps on the port. The traffic on this physical port is now affected by the policy map
attached to the SVI to which the physical port belongs.
–
In a hierarchical policy map attached to an SVI, you can only configure an individual policer at
the interface level on a physical port to specify the bandwidth limits for the traffic on the port.
The ingress port must be configured as a trunk or as a static-access port. You cannot configure
policers at the VLAN level of the hierarchical policy map.
–
The switch does not support aggregate policers in hierarchical policy maps.
–
After the hierarchical policy map is attached to an SVI, the interface-level policy map cannot
be modified or removed from the hierarchical policy map. A new interface-level policy map also
cannot be added to the hierarchical policy map. If you want these changes to occur, the
hierarchical policy map must first be removed from the SVI. You also cannot add or remove a
class map specified in the hierarchical policy map.
Configuring IPv6 QoS on Switch Stacks
You can enable IPv6 QoS on a switch or a switch stack. If the stack includes only Catalyst 3750-X and
Catalyst 3750-E switches, the QoS configuration applies to all traffic. These are the guidelines for IPv6
QoS in a stack that includes one or more Catalyst 3750 switches:
•
Any switch can be the stack master.
•
You can attach policies with IPv6 ACLs only on Catalyst 3750-X and 3750-E switch interfaces.
•
You can modify an attached policy to include an IPv6 ACL only on Catalyst 3750-X and
Catalyst 3750-E switch interfaces.
•
A policy that includes the
match protocol IPv6
classification applies only on Catalyst 3750-X and
Catalyst 3750-E switch interfaces.
•
A QoS policy with both IPv4 and IPv6 classification can be attached to an SVI on a mixed switch
stack, but the policy applies to only IPv4 traffic entering Cisco 3750 switch interfaces, and to both
IPv4 and IPv6 traffic on Catalyst 3750-X and Catalyst 3750-E switch interfaces.
•
IPv6 trust is supported on Catalyst 3750, Catalyst 3750-X, and Catalyst 3750-E switches.
•
QoS policies that include IPv6-specific classification (such as an IPv6 ACL or the
match protocol
ipv6
command) are supported on Catalyst 3750-X and Catalyst 3750-E interfaces and on any SVI
when a Catalyst 3750-X or Catalyst 3750-E switch is part of the stack.
•
QoS policies that include common IPv4 and IPv6 classifications are supported on all
Catalyst 3750-X and Catalyst 3750-E interfaces in the stack. Only IPv4 classification is supported
on other switches in the stack.
Policing Guidelines
•
The port ASIC device, which controls more than one physical port, supports 256 policers
(255 user-configurable e policers plus 1 policer reserved for system internal use). The maximum
number of user-configurable policers supported per port is 63. For example, you could configure 32
Summary of Contents for Catalyst 3750-E Series
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