Qos Profiles - Juniper JUNOSE 11.1.X - QUALITY OF SERVICE CONFIGURATION GUIDE 3-21-2010 Configuration Manual

If the configuration includes S-VLANs, you could configure S-VLAN nodes in the
default traffic-class group. Combining S-VLAN and VLAN nodes uses fewer
resources than when you combine IP and VLAN nodes. You can also configure
additional S-VLAN nodes in other traffic-class groups.
In non-default traffic-class groups, you can configure a group node and VLAN queues.
Although this apparently does not consume nodes, it does consume a hidden,
phantom node for each queue, to satisfy the level requirement of the TFA ASIC.
Alternatively, use group nodes and shadow nodes.
We recommend that you configure an Ethernet shadow node in the group with the
following QoS profile rule:
host1(config-qos-profile)#ethernet shadow-node group groupname
This rule stacks another node over the group node, so all VLAN queues are stacked
above the single shadow node. No nodes are consumed in the traffic-class group.
For more information about system resource requirements for shadow nodes,
Related Topics
see Managing System Resources for Shadow Nodes on page 151
For QoS system maximums, see JUNOSe Release Notes, Appendix A, System
Maximums
Monitoring the QoS Profiles Attached to an Interface on page 339
Chapter 15: QoS Profile Overview
Scaling Subscribers on the TFA ASIC with QoS
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