Specifications

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Chapter 4 Cisco IGX 8400 Series Trunks
IGX Trunk Configuration
Figure 4-2 Sample IGX IMA Feeder Node Topology
IGX Trunk Configuration
This section provides information on configuring a trunk with at least one endpoint on an IGX node. For
information on configuring a trunk with one endpoint on a BPX node, also refer to the “Configuring
Trunks and Adding Interface Shelves” chapter in the Cisco BPX 8600 Installation and Configuration
guide.
When configuring a trunk with an endpoint on an IGX node, you will complete the following tasks:
1. Plan bandwidth usage (see the “Planning Bandwidth Usage” section on page 4-6).
2. Set up the trunk (see the “Setting Up a Trunk” section on page 4-9).
3. (Optional) Configure the virtual trunk (see the “Setting Up a Virtual Trunk” section on page 4-9).
4. (Optional) Configure IMA (see the “IMA on the IGX” section on page 4-5).
5. Configure connections onto the trunk (see the “IGX Line Configuration” section on page 5-3).
Planning Bandwidth Usage
Before setting up a trunk on a node, you should plan bandwidth usage for each trunk with an endpoint
on the node.
To optimize the node’s ability to handle network traffic, you should plan for cellbus bandwidth
allocation on the IGX node (see the “Planning for Cellbus Bandwidth Allocation” section on page 4-6).
To optimize available bandwidth on an IMA trunk or line, you should calculate the maximum transfer
and receive rates for the IMA trunk or line (see the “Bandwidth on IMA Trunks and Lines” section on
page 4-8).
To reduce the risk of failed connections on a trunk, you should estimate the connection load and
calculate the statistical reserve that will be configured for the trunk.
Planning for Cellbus Bandwidth Allocation
Switch software on the NPM monitors and computes cellbus bandwidth requirements for each card
installed in the node. However, for the UXM-E, you can reconfigure the card’s cellbus bandwidth
allocation in order to optimize the node’s ability to handle network traffic.
Note ATM cell and FastPacket bandwidth on the cellbus is measured in universal bandwidth units (UBUs).
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