Qualtiy Of Service - Cisco Catalyst 6500 User Manual

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MEC is recommended in L3 and L2 environment to provide deterministic convergence.
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MEC eliminates Reverse Path Forwarding (RPF) recalculation during any MEC link failure.
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Egress replication with local enhancement for higher multicast replication throughput.
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Egress replication requires DFCs for optimized replication performance.
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Size the VSL to meet traffic requirements.

Qualtiy of Service

VSL QoS Settings
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VSL is a critical internal control and data communication path, and hence QoS settings are
pre−configured and configuration changes are not allowed.
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VSL is always configured as Trust CoS and ingress queueing is enabled.
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Only CoS based trust and queuing is supported currently. Service policies are not supported on VSL.
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QoS policies must be applied at the input interface of the flows.
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Priority queue is enabled by default. VSS control traffic and BPDUs are given high priority on VSL
link.
Recommendations
The only difference between the VSL capable hardware options is the queue configuration. As the current
release of software does not allow modification to the default queue settings, any combination of VSL capable