Cisco Systems OL-7396-01 Manual De Usuario

Descargar
Página de 934
7-74
ATM Switch Router Software Configuration Guide 
OL-7396-01
Chapter 7
Configuring Virtual Connections
Configuring Nondefault Well-Known PVCs
Configuring Nondefault Well-Known PVCs
Normally the default well-known VCs are automatically created with default virtual channel identifiers 
(VCIs). However, for the unusual instances where the ATM switch router interfaces with nonstandard 
equipment, you can configure nondefault well-known VCI values on a per-interface basis.
For overview information about the well-known PVCs, refer to the Guide to ATM Technology.
 lists the default well-known VCs and their default configuration.
Caution
Do not change the well-known channels to use a VC where the remote end is sending AAL5 messages 
not intended for the well-known VC. For example, do not swap VC values between two types of 
well-known VCs.
When you configure well-known VCs on physical interfaces using the CBR service category, the VC 
scheduling on the external interface is the same as the CBR VC configuration. This means that the VCs 
are allocated the bandwidth specified and are limited to that same bandwidth (shaped).
Note
The connection from an external interface to the route processor is never shaped.
Overview of Nondefault PVC Configuration
Following is an overview of the steps needed to configure nondefault well-known VCs:
Step 1
Enable manual well-known VC configuration.
Step 2
Delete any existing automatically created well-known VCs.
Step 3
Configure the individual encapsulation type as follows:
Signalling (QSAAL)
ILMI
PNNI
Tag switching
Step 4
Copy the running-configuration file to the startup-configuration file.
Table 7-2
Well-Known Virtual Channels
Channel Type
Virtual Path Identifier
Virtual Channel Identifier
Signalling
0
5
ILMI
0
16
PNNI
0
18
Tag switching 0
32