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ATM Switch Router Software Configuration Guide
OL-7396-01
Chapter18 Configuring Interfaces
Configuring 25-Mbps Interfaces (Catalyst 8510 MSR and LightStream 1010)
Note For hardware installation and cabling instructions, refer to the ATM Port Adapter and Interface Module
Installation Guide. For complete descriptions of the commands mentioned in this chapter, refer to the
ATMSwi tch Router Command Reference publication.
To configure the circuit emulation service (CES) T1 and E1 port adapters, see Chapter19, “Configuring
Circuit Emulation Services.” To configure the Frame Relay E1 port adapters, see Chapter20,
“Configuring Frame Relay to ATM Interworking Port Adapter Interfaces.” To configure the T1 and E1
inverse multiplexing over ATM (IMA) port adapters, see Chapter21, “Configuring IMA Port Adapter
Interfaces.” To configure the ATM router modules, see Chapter25, “Configuring ATM Router Module
Interfaces.”
Configuring 25-Mbps Interfaces (Catalyst 8510 MSR and
LightStream 1010)
The ATM switch supports two types of 25-Mbps port adapters: a 4-port version and a 12-port version.
The number of ports is determined by the type of cable used with the 25-Mbps port adapters. The cables
have a 96-pin Molex connector with a multileg RJ-45 cable assembly. That is, multiple RJ-45 cables
branch off from one large 96-pin Molex connector. You can choose either a 4-port version (with four
RJ-45 cables) or a 12-port version (with 12 RJ-45 cables). Each 25.6-Mbps ATM port can be used for
workgroup links. Each port complies with the ATM Forum PHY standard for 25.6 Mbps over
twisted-pair cable.
The plug-and-play mechanisms of the ATM switch allow the switches to come up automatically. All
configuration information for the port adapters can be saved between h ot swaps and switch reboots,
while interface types are automatically discovered by the switch, thereby eliminating mandatory manual
configuration.
The ATM switch supports any combination of port adapters. You can configure your switch with up to
32 25-Mbps interface ports with the 4-port 25-Mbps port adapter, or up to 96 25-Mbps interface ports
with the 12-port 25-Mbps port adapter.

Default 25-Mbps ATM Interface Configuration without Autoconfiguration

(Catalyst 8510 MSR and LightStream 1010)
If ILMI is disabled or if the connecting end node does not support ILMI, the following defaults are
assigned to all 25-Mbps interfaces:
ATM interface type = UNI
UNI version = 3.0
Maximum VPI bits = 2
Maximum VCI bits = 14
ATM interface side = network
ATM UNI type = private