Table of Contents
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CHAPTER 17
Configuring Shadow Nodes for Queue
Management
Shadow Node Overview
Copyright © 2010, Juniper Networks, Inc.
This chapter provides information for configuring shadow nodes on E Series routers.
QoS topics are discussed in the following sections:
Shadow Node Overview on page 141
Shadow Nodes and Scheduler Behavior on page 142
Managing System Resources for Shadow Nodes on page 143
Configuring Shadow Nodes on page 144
Example: Shadow Nodes over VLAN and IP Queues on page 145
Example: Shadow Nodes on the Same Traffic-Class Group on page 146
Example: Shadow Nodes on Different Traffic-Class Groups on page 146
The frame forwarding ASIC (FFA) and the 10-Gigabit Ethernet forwarding ASIC (TFA)
require that all queues be above the port scheduler node with two additional scheduler
nodes. The router implicitly creates phantom nodes when you do not specify two scheduler
nodes above the port interface. Phantom nodes cannot be monitored using show
commands.
Phantom nodes have the same weight as the associated queues and are not shaped,
which preserves the behavior of the queues as if they are at their original level.
Figure 41 on page 142 compares a scheduler hierarchy with and without phantom nodes.
141
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Troubleshooting
