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Cisco PNNI Network Planning Guide for MGX and SES Products, Release 5
Part Number OL-3847-01 Rev. D0, April, 2004
Chapter 3 Address and Closed User Group Planning
Planning CUG Configuration Settings
The CPE must be configured to specify a particular CUG index during call setup when any of the
following conditions exist:
• One or more CUGs are defined for the CPE prefix or address and no preferential CUG is defined.
• Multiple CUGs are defined for the prefix or address and the CPE intends to use a CUG other than
the preferential CUG.
If a CPE AESA is a member of only one CUG and that CUG is defined as the preferential CUG (see
“Specifying a Preferential CUG,” which appears later in this chapter), the CPE does not need to be
configured to use a particular CUG. The preferential CUG serves as the implicit CUG, and is used
whenever a CUG index is not specified by the CPE.
Note When a CPE requests a specific CUG during call setup, this is called an explicit CUG request.
When planning a CUG using the CUG Configuration Worksheet, Table 3-6, enter the index in the second
row of the worksheet.
Selecting CPE Addresses
To add a CPE to a CUG, the configuration process assigns a CPE address or prefix to a CUG interlock
code and index. For each CUG assignment, you must specify the following:
• The ATM address or prefix of a local UNI interface.
• The length of the ATM address.
• The ATM address plan, which is either NSAP or E164.
This information is required so that the switch interprets the address or prefix correctly.
If the prefix or address you are assigning to a CUG uses the NSAP format, specify the address length in
bits. A full AESA is 160 bits (20 bytes times 8 bits). A shorter address length indicates an ATM address
prefix, which assigns all addresses with that prefix to the CUG you specify.
If the prefix or address you are assigning to a CUG uses the E.164 format, specify the prefix or address
length in digits.
When planning a CUG using the CUG Configuration Worksheet, Table 3-6, use one worksheet row to
identify the CUG configuration for each CUG member. The first column identifies the address or prefix
for the CUG member, and the rest of the columns specify the address information, access information,
and preferential CUG status.
Selecting Internal CUG Access Options
Internal access options control communications between a specific CUG member and the rest of the
CUG. In the CLI, this is expressed in terms of calls barred. If you want to block outgoing calls from one
CUG member to other CUG members, write the word outgoing in the row for the CUG member address
in the CUG Configuration Worksheet, Table 3-6. To block calls from other CUG members to a CUG
member, write in the word incoming.