- Download
Software
- Research a
Problem - Case Management
- Communities and Forums
- Contract & Product Management
- Technical Documentation Advanced Search
- Documentation Feedback Form
- Documentation Symbols Key
- End-of-Life Products
- Guidelines and Policies
- Security Resources
Juniper was the first North American IP routing vendor to achieve the prestigious TL 9000 certification by the Quality of Excellence for Suppliers of Telecommunications (QuEST) Forum in the router category, for design, development, provision and service and support.
What is J-Care?
It's the world-class service and support that you expect from a company that delivers the industry's best infrastructure and security products. With J-Care, you now have the confidence knowing that Juniper will do our part to keep you on top of the world!
- Downloads
- Shadow Node Overview
Shadow Node Overview
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 1 compares a scheduler hierarchy with and without phantom nodes.
Figure 1: Phantom Nodes
The first scheduler hierarchy displayed in Figure 1 shows Queue A, Queue B, and Node C at the same scheduler level and with the same weight of 8. They equally share the bandwidth available to the level 1 node.
The second scheduler hierarchy in Figure 1 shows the phantom nodes the router added for Queue A and Queue B. It also shows the weight associated with Queue A and Queue B. As the result, Phantom A, Phantom B, and Node C share the bandwidth of the level 1 node. The phantom nodes do not change the behavior of Queue A and Queue B.
