Table Of Contents
1-Port ATM-25 Network Module for the Cisco 3600 Series
General Description of the 1-Port ATM-25 Network Module
1-Port ATM-25 Network Module Features
Configure the ATM-25 Interface
Map a Protocol Address to a PVC
1-Port ATM-25 Network Module for the Cisco 3600 Series
Feature Summary
The 1-port asynchronous transfer mode (ATM-25) network module provides full 25.6 Mbps connectivity to an external asynchronous digital subscriber line (ADSL) modem or ATM switch for Cisco Series 3600 routers. This network module provides ATM traffic shaping for use with ADSL uplink speeds and protocol support for both permanent virtual circuit (PVC) and switched virtual circuits (SVC) environments. This network module provides full support for multiprotocol encapsulation over ATM Adaptive Layer 5 (RFC 1483), classic IP over ATM encapsulation (RFC 1577), and ATM User Network interface signaling.
shows the 1-port ATM-25 network module in a typical ADSL application environment. In this example, the network module and the associated Cisco3640 router provide ATM connectivity to the ADSL modem and provide traffic shaping and protocol encapsulation for the downstream LAN clients.
Figure 1 1-Port ATM-25 Network Module in a Typical ADSL Application Environment
General Description of the 1-Port ATM-25 Network Module
The 1-port ATM-25 network module has a single RJ-45 connector with signals compliant with the ATM Forum recommendation for the 25.6 Mbps ATM physical layer. This network module uses a highly-integrated ATM Segmentation and Reassembly (SAR)/PCI bridge with local SRAM to provide basic ATM hardware functionality. Transmission (TX) and Receiving (RX) descriptors are stored on the card and data buffers are kept in host memory and transferred via direct memory access across the PCI bus. Software drivers provide protocol support for PVCs and SVCs for direct connection to ATM switches or ADSL modems.
1-Port ATM-25 Network Module Features
The 1-port ATM-25 network module offers the following features:
•
Up to two network modules can be installed in the same Cisco 3600 series router
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Benefits
The 1-Port ATM-25 Network Module for the Cisco 3600 Series provides the following benefits:
•
•
List of Terms
Asymmetrical Digital Subscriber Line (ADSL)—One-way digital transmission link using existing single twisted-pair wiring.
Asynchronous Transfer Mode (ATM)—High bandwidth, low-delay, packet-like switching and multiplexing technique. Usable capacity is segmented into 53-byte fixed-size cells, consisting of header and information fields, allocated to services on demand.
ATM-25—25 Mbps ATM developed by IBM.
Interim Local Management Interface (ILMI)—Specification developed by the ATM Forum for incorporating network-management capabilities into the ATM UNI.
Operations, Administration, and Management (OAM)—ATM Forum specification for cells used to monitor virtual circuits. OAM cells provide a virtual circuit-level loopback in which a router responds to the cells, demonstrating that the circuit is up, and the router is operational.
Quality of Service (QoS)—Measure of performance for a transmission system that reflects its transmission quality and service availability.
Segmentation and Reassembly (SAR)—A layer of the ATM protocol stack responsible for the data segmentation into standard ATM fixed-length cells for transmission over an ATM network and for data reconstruction at the receiving end.
Unspecified Bit Rate (UBR)—QoS class defined by the ATM Forum for ATM networks. UBR allows any amount of data up to a specified maximum to be sent across the network, but there are no guarantees in terms of cell loss rate and delay.
Virtual circuit (VC)—Logical circuit created to ensure reliable communication between two network devices. A virtual circuit is defined by a VPI/VCI pair, and can be either permanent (a PVC) or switched (an SVC). In ATM, a virtual circuit is also called a virtual channel.
Platforms
This feature is supported on the Cisco 3600 series routers.
Prerequisites
Before you can configure an ATM interface, complete the following prerequisite tasks:
•
•
•
Supported MIBs and RFCs
This feature supports the following MIBs:
•
•
•
•
For descriptions of supported MIBs and how to use MIBs, see Cisco's MIB website on CCO at http://www.cisco.com/public/sw-center/netmgmt/cmtk/mibs.shtml.
This feature supports the following RFCs:
•
•
Configuration Tasks
Whenever you install a new interface, you must configure the interface. To configure the ATM-25 interface, you need to perform the following tasks:
•
•
Configure the ATM-25 Interface
To configure the ATM-25 interface, perform the following tasks beginning in global configuration mode:
For more information about configuring ATM interfaces, refer to the Cisco IOS Release 11.3 Wide-Area Networking Configuration Guide.
Create a PVC
A PVC requires the entire path from source to destination to be set manually, meaning that you must configure the PVC into both the router and any ATM switches in the path. PVCs remain active until the circuit is removed from either the router or the switch configuration.
To create a PVC on the ATM-25 network module, perform the following task in interface configuration mode
Set up the PVC.
atm pvc vcd vpi vci aal-encap [[midlow midhigh] [peak average burst]] [oam seconds] [inarp minutes]
For more information about configuring ATM interfaces, refer to the Cisco IOS Release 11.3 Wide-Area Networking Configuration Guide.
Map a Protocol Address to a PVC
The ATM interface supports a static mapping scheme that identifies the ATM address of remote hosts or routers. This address is specified as a virtual circuit descriptor (VCD) for a PVC.
You enter mapping commands as groups. You first create a map list and then associate it with an interface. To map a protocol address to a PVC, perform the following tasks beginning in global configuration mode:
For more information about configuring ATM interfaces, refer to the Cisco IOS Release 11.3 Wide-Area Networking Configuration Guide.
Configuration Examples
The following example shows how to configure a PVC connection between two Cisco 3600 series routers using the 1-port ATM-25 network module:
Configuration for Router A:
configure terminalinterface atm1/0ip addr 1.2.3.4 255.0.0.0atm pvc 1 0 32 aal5snapmap-group ipano shutdownexitmap-list ipaip 1.2.3.3 atm-vc 1 broadcastConfiguration for Router B:
configure terminalinterface atm1/0ip addr 1.2.3.3 255.0.0.0atm pvc 1 0 32 aal5snapmap-group ipbno shutdownexitmap-list ipbip 1.2.3.4 atm-vc 1 broadcastIn this example:
•
•
•
•
•
•
•
•
In the previous example, if you want to configure traffic shaping at 10 Mbps, the atm pvc command would be configured as follows:
For Router A:
atm pvc 1 0 32 aal5snap 10000 10000 1For Router B:
atm pvc 1 0 32 aal5snap 10000 10000 1In the previous example, you would only be able to transmit at 10Mbps; the remaining 15 Mbps would no longer be available.
Command Reference
There are no new or edited commands introduced with the 1-Port ATM-25 Network Module. All other commands used with this device are documented in the Cisco IOS Release 11.3 command references.
Guest
