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This chapter describes how to configure ATM on the Cisco ASR 1000 Series Aggregation Services Routers.
Your software release may not support all the features documented in this module. For the latest feature information and caveats, see the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the Feature Information Table at the end of this document.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.
This section describes how to configure an ATM interface. For the AIP, all ATM port adapters, and the 1-port ATM-25 network module, the port number is always 0. For example, the slot/port address of an ATM interface on an AIP installed in slot 1 is 1/0.
To configure the ATM interface, use the following commands beginning in privileged EXEC mode:
To use a permanent virtual circuit (PVC), you must configure the PVC into both the router and the ATM switch. PVCs remain active until the circuit is removed from either configuration.
When a PVC is configured, all the configuration options are passed on to the ATM interface. These PVCs are writable into the nonvolatile RAM (NVRAM) as part of the Route Processor (RP) configuration and are used when the RP image is reloaded.
Some ATM switches might have point-to-multipoint PVCs that do the equivalent of broadcasting. If a point-to-multipoint PVC exists, then that PVC can be used as the sole broadcast PVC for all multicast requests.
To configure a PVC, perform the tasks in the following sections. The first two tasks are required; the other tasks are optional.
Note |
After configuring the parameters for an ATM PVC, you must exit interface-ATM-VC configuration mode in order to create the PVC and enable the settings. |
To create a PVC on the ATM interface and enter interface-ATM-VC configuration mode, use the following command beginning in interface configuration mode:
Command |
Purpose |
---|---|
Router(config-if)# pvc [name] vpi /vci |
Configures a new ATM PVC by assigning a name (optional) and VPI/VCI numbers. Enters interface-ATM-VC configuration mode.
|
The ATM interface supports a static mapping scheme that identifies the network address of remote hosts or routers. This section describes how to map a PVC to an address, which is a required task for configuring a PVC.
Note |
If you enable or disable broadcasting directly on a PVC using the protocol command, this configuration will take precedence over any direct configuration using the broadcast command. |
See examples of PVC configurations in the section "ATM Configuration Examples".
To map a protocol address to a PVC, use the following command in interface-ATM-VC configuration mode:
Command |
Purpose |
---|---|
Router(config-if-atm-vc)# protocol protocol protocol-address [[no] broadcast] |
Maps a protocol address to a PVC. |
To configure the ATM adaptation layer (AAL) and encapsulation type, use the following command beginning in interface-ATM-VC configuration mode:
The supported traffic parameters are part of the following service categories: Constant Bit Rate (CBR), Unspecified Bit Rate (UBR), Variable Bit Rate Non Real-Time (VBR-NRT), and real-time Variable Bit Rate (VBR). Only one of these categories can be specified per PVC connection so if a new one is entered, it will replace the existing one.
Note |
The commands in this section are not supported on the ATM port adapter (PA-A1 series). The 1-port ATM-25 network module only supports UBR. |
The -pcr and -mcr arguments are the peak cell rate and minimum cell rate, respectively. The -scr and -mbs arguments are the sustainable cell rate and maximum burst size, respectively.
For a description of how to configure traffic parameters in a VC class and apply the VC class to an ATM interface or subinterface, refer to the section "Configuring VC Classes."
To configure PVC traffic parameters, use one of the following commands beginning in interface-ATM-VC configuration mode:
Command |
Purpose |
---|---|
Router(config-if-atm-vc)# cbr peak_cell_rate_KBPS |
Configures the Constant Bit Rate (CBR). |
Router(config-if-atm-vc)# ubr output-pcr |
Configures the Unspecified Bit Rate (UBR). |
Router(config-if-atm-vc)# vbr-nrt output-pcr output-scr output-mbs |
Configures the Variable Bit Rate-Non Real Time (VBR-NRT) QOS. |
Router(config-if-atm-vc)# vbr-rt peak-rate average-rate burst
|
Configures the real-time Variable Bit Rate (VBR). (Cisco MC3810 and Multiport T1/E1 ATM Network Module only.) |
Inverse ARP is enabled by default when you create a PVC using the pvc command. Once configured, a protocol mapping between an ATM PVC and a network address is learned dynamically as a result of the exchange of ATM Inverse ARP packets.
Inverse ARP is supported on PVCs running IP or IPX and no static map is configured. If a static map is configured, Inverse ARP will be disabled.
When PVC discovery is enabled on an active PVC and the router terminates that PVC, the PVC will generate an ATM Inverse ARP request. This allows the PVC to resolve its own network addresses without configuring a static map.
Address mappings learned through Inverse ARP are aged out. However, mappings are refreshed periodically. This period is configurable using the inarp command, which has a default of 15 minutes.
You can also enable Inverse ARP using the protocol command. This is necessary only if you disabled Inverse ARP using the no protocol command. For more information about this command, refer to the "ATM Commands" chapter in the Cisco IOS Wide-Area Networking Command Reference.
For an example of configuring Inverse ARP, see the section "Enabling Inverse ARP Example".
To enable Inverse ARP on an ATM PVC, use the following commands beginning in global configuration mode:
Command or Action | Purpose | |
---|---|---|
|
Example:
Example:
Example: Router(config)# interface atm number[. subinterface-number {multipoint | point-to-point}] |
Specifies the ATM interface using the appropriate format of the interface atm command.1 |
|
|
Specifies an ATM PVC by name (optional) and VPI/VCI numbers. |
|
|
Configures AAL5 LLC-SNAP encapsulation if it is not already configured. |
|
|
(Optional) Adjusts the Inverse ARP time period. |
The ancp enable command should be configured only for the control VCs on which the Access Node Control Protocol (ANCP) message is sent from the DSLAM. Use the following procedure to enable ANCP on ATM interfaces. For an example of enabling ANCP, see the section Enabling ANCP on ATM Interfaces Example.
You can optionally configure the PVC to generate end-to-end F5 OAM loopback cells to verify connectivity on the virtual circuit. The remote end must respond by echoing back such cells. If OAM response cells are missed (indicating the lack of connectivity), the PVC state goes down. If all the PVCs on a subinterface go down, the subinterface goes down.
For information about managing PVCs using OAM, see the section "Configuring OAM Management for PVCs".
For an example of OAM loopback cell generation, see the section "Configuring Loopback Cells Example".
To configure transmission of end-to-end F5 OAM cells on a PVC, use the following commands in interface-ATM-VC configuration mode:
To send duplicate broadcast packets for all protocols configured on a PVC, use the following command in interface-ATM-VC configuration mode:
Note |
If you enable or disable broadcasting directly on a PVC using the protocol command, this configuration will take precedence over any direct configuration using the broadcast command. |
Command |
Purpose |
---|---|
Router(config-if-atm-vc)# broadcast |
Sends duplicate broadcast packets for all protocols configured on a PVC. |
By creating a VC class, you can preconfigure a set of default parameters that you may apply to a PVC. To create a VC class, refer to the section "Configuring VC Classes".
Once you have created a VC class, use the following command in interface-ATM-VC configuration mode to apply the VC class to a PVC:
Command |
Purpose |
---|---|
Router(config-if-atm-vc)# class-vc vc-class-name |
Applies a VC class to a PVC.
|
You can configure the PVC to provide failure notification by sending a trap when a PVC on an ATM interface fails or leaves the UP operational state.
Only one trap is generated per hardware interface, within the specified interval defined by the interval "atmIntPvcNotificationInterval". If other PVCs on the same interface go DOWN during this interval, traps are generated and held until the interval has elapsed. Once the interval has elapsed, the traps are sent if the PVCs are still DOWN.
No trap is generated when a PVC returns to the UP state after having been in the DOWN state. If you need to detect the recovery of PVCs, you must use the SNMP management application to regularly poll your router.
When PVC trap support is enabled, the SNMP manager can poll the SNMP agent to get PCV status information. The table "atmInterfaceExtTable" provides PVC status on an ATM interface. The table "atmCurrentlyFailingPVclTable" provides currently failing and previously failed PVC time-stamp information.
Note |
PVC traps are only supported on permanent virtual circuit links (PVCLs), not permanent virtual path links (PVPLs). |
Before you enable PVC trap support, you must configure SNMP support and an IP routing protocol on your router. See the "ATM Configuration Examples" section.
For more information about configuring SNMP support, refer to the chapter "Configuring SNMP Support" in the Cisco IOS Configuration Fundamentals Configuration Guide.
For information about configuring IP routing protocols, refer to the Cisco IOS IP Routing Protocols Configuration Guide.
To receive PVC failure notification and access to PVC status tables on your router, you must have the Cisco PVC trap MIB called CISCO-IETF-ATM2-PVCTRAP-MIB.my compiled in your NMS application. You can find this MIB on the Web at Cisco's MIB websiteat the URL: http://www.cisco.com/public/sw-center/netmgmt/cmtk/mibs.shtml.
When you configure PVC trap support, you must also enable OAM management on the PVC.
For more information on OAM management, see the section "Configuring OAM Management for PVCs" later in this chapter.
The new objects in this feature are defined in the IETF draft The Definitions of Managed Objects for ATM Management , which is an extension to the AToM MIB (RFC 1695).
For an example of configuring PVC trap support, see the section "Configuring PVC Trap Support Example".
To enable PVC trap support and OAM management, use the following commands beginning in global configuration mode:
Command or Action | Purpose | |
---|---|---|
|
|
Enables PVC trap support. |
|
Example: Router(config)# interface atm number[. subinterface-number {multipoint | point-to-point}] |
Specifies the ATM interface using the appropriate form of the interface atm command.2 |
|
|
Enables the PVC. |
|
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Enables end-to-end OAM management for an ATM PVC. |
A VC class is a set of preconfigured VC parameters that you configure and apply to a particular VC or ATM interface. You may apply a VC class to an ATM main interface, subinterface, or PVC. For example, you can create a VC class that contains VC parameter configurations that you will apply to a particular PVC. You might create another VC class that contains VC parameter configurations that you will apply to all VCs configured on a particular ATM main interface or subinterface. Refer to the "ATM Configuration Examples" section for examples of VC class configurations.
To create a VC class, use the following command in global configuration mode:
For examples of creating VC classes, see the section "Creating a VC Class Example".
Command |
Purpose |
---|---|
Router(config)# vc-class atm name |
Creates a VC class and enters vc-class configuration mode. |
After you create a VC class and enter vc-class configuration mode, configure VC parameters using one or more of the following commands:
Refer to the sections "Configuring PVCs" and "Configuring PVC Trap Support" for descriptions of how to configure these commands for PVCs.
For examples of creating VC classes, see the section "Creating a VC Class Example".
Once you have created and configured a VC class, you can apply it directly on an ATM PVC, or you can apply it on an ATM interface or subinterface.
To apply a VC class directly on an ATM PVC use the following commands beginning in interface configuration mode:
Command or Action | Purpose | |
---|---|---|
|
|
Specifies an ATM PVC |
|
|
Applies a VC class directly on the PVC. |
To apply a VC class on an ATM main interface or subinterface, use the following commands beginning in global configuration mode:
Command or Action | Purpose | |
---|---|---|
|
Example:
Example:
Example: Router(config)# interface atm number[. subinterface-number {multipoint | point-to-point}] |
Specifies the ATM interface using the appropriate format of the interface atm command.3 |
|
|
Applies a VC class on an the ATM main interface or subinterface. |
When you configure VC management, you enable the router to detect VC connections and disconnections automatically. This notifies protocols to reroute packets immediately, preventing protocols from waiting for unpredictable and relatively long timeout periods.
You may use operation, administration, and maintenance (OAM) to manage your PVCs, and decide which method is reliable in your particular network.
When a PVC goes down, route caches for protocols configured on that PVC are cleared (or flushed) so that new routes may be learned. The route cache flush is applied on the PVC's interface. When all PVCs on a subinterface go down, VC management shuts down the subinterface in addition to flushing route caches. ATM hardware must keep the PVC active, however, so that OAM cells may flow. When any PVC on a subinterface comes up, the subinterface is brought up.
VC management using OAM is referred to as OAM management.
OAM management may be enabled for PVCs.
By default, end-to-end F5 OAM loopback cell generation is turned off for each PVC. A PVC is determined as down when any of the following is true on that PVC:
A PVC is determined as up when all of the following are true on that PVC:
To configure OAM management for an ATM PVC, use the following commands beginning in global configuration mode:
Command or Action | Purpose | |
---|---|---|
|
Example:
Example:
Example: Router(config)# Router(config)# interface atm number[. subinterface-number {multipoint | point-to-point}] |
Specifies the ATM interface using the appropriate format of the interface atm command.4 |
|
|
Specifies the ATM PVC. |
|
|
Enables OAM management on the PVC. |
|
|
(Optional) Specifies OAM management parameters for re-establishing and removing a PVC connection.
|
The ATM Inverse ARP mechanism is applicable to networks that use PVCs, where connections are established but the network addresses of the remote ends are not known. A server function is not used in this mode of operation.
By default, Inverse ARP datagrams will be sent on this virtual circuit every 15 minutes. To adjust the Inverse ARP time period, use the inarp minutes command in interface-ATM-VC configuration mode.
Note |
The ATM ARP mechanism works with IP only. The Inverse ATM ARP mechanism works with IP and IPX only. For all other protocols, the destination address must be specified. |
In a PVC environment, the ATM Inverse ARP mechanism is enabled by default for IP and IPX when you use the following commands beginning in global configuration mode:
Command or Action | Purpose | |
---|---|---|
|
Example:
Example:
Example: Router(config)# interface atm number |
Specifies the ATM interface using the appropriate format of the interface atm command.5 |
|
|
Specifies the IP address of the interface. |
|
|
Creates a PVC. |
|
|
Enables the ATM interface. |
|
|
Repeat Step 3 for each PVC you want to create. |
You can customize the ATM interface. The features you can customize have default values that will most likely suit your environment and probably need not be changed. However, you might need to enter configuration commands, depending upon the requirements for your system configuration and the protocols you plan to route on the interface.
Each interface has a default maximum packet size or maximum transmission unit (MTU) size. For ATM interfaces, this number defaults to 4470 bytes. The maximum is 9188 bytes for the AIP and NPM, 17969 for the ATM port adapter, and 17998 for the ATM-CES port adapter. The MTU can be set on a per-sub-interface basis as long as the interface MTU is as large or larger than the largest subinterface MTU.
To set the maximum MTU size, use the following command in interface configuration mode:
Command |
Purpose |
---|---|
Router(config-if)# mtu bytes |
Sets the maximum MTU size. |
After configuring an ATM interface, you can display its status. You can also display the current state of the ATM network and connected virtual circuits. To show current virtual circuits and traffic information, use the following commands in EXEC mode:
Command |
Purpose |
||
---|---|---|---|
Router# show arp |
Displays entries in the ARP table. |
||
Router# show atm class-links {vpi / vci | name} |
Displays PVC parameter configurations and where the parameter values are inherited from. |
||
Router# show atm interface atm slot /0 Router# show atm interface atm slot / port-adapter /0 Router# show atm interface atm number |
Displays ATM-specific information about the ATM interface using the appropriate format of the show atm interface atm command.6 |
||
Router# show atm map |
Displays the list of all configured ATM static maps to remote hosts on an ATM network. |
||
Router# show atm pvc [vpi / vci | name | interface atm interface_number] |
Displays all active ATM PVCs and traffic information. |
||
Router# show atm traffic |
Displays global traffic information to and from all ATM networks connected to the router, OAM statistics, and a list of counters of all ATM traffic on this router. |
||
Router# show atm vc [vcd-number | [range lower-limit-vcd upper-limit-vcd] [interface ATM interface-number] [detail [prefix {vpi/vci | vcd | interface | vc_name}]] [connection-name] | signalling [freed-svcs | [cast-type {p2mp | p2p}] [detail] [interface ATM interface-number]] | summary ATM interface-number] |
Displays all active ATM virtual circuits (PVCs ) and traffic information.
|
||
Router# show interfaces atm Router# show interfaces atm slot /0 Router# show interfaces atm slot / port-adapter /0 |
Displays statistics for the ATM interface using the appropriate format of the show interfaces atm command. |
||
Router# show network-clocks |
Displays the clock signal sources and priorities that you established on the router. |
The examples in the following sections illustrate how to configure ATM for the features described in this chapter. The examples below are presented in the same order as the corresponding configuration task sections:
The following example shows how to create a PVC on an ATM main interface with AAL5/MUX encapsulation configured and a VBR-NRT QOS specified. For further information, refer to the sections "Creating a PVC" and "Configuring PVC Traffic Parameters".
interface 2/0 pvc cisco 1/40 encapsulation aal5mux ip vbr-nrt 100000 50000 20 exit
The following example shows how to create a PVC 0/50 on ATM interface 3/0. It uses the global default LLC/SNAP encapsulation over AAL5. The interface is at IP address 1.1.1.1 with 1.1.1.5 at the other end of the connection. For further information, refer to the sections "Creating a PVC" and "Mapping a Protocol Address to a PVC".
interface atm 3/0 ip address 1.1.1.1 255.255.255.0 pvc 0/50 protocol ip 1.1.1.5 broadcast exit ! ip route-cache cbus
The following example is a typical ATM configuration for a PVC:
interface atm 4/0 ip address 172.21.168.112 255.255.255.0 atm maxvc 512 pvc 1/51 protocol ip 171.21.168.110 exit ! pvc 2/52 protocol decnet 10.1 broadcast exit ! pvc 3/53 protocol clns 47.004.001.0000.0c00.6e26.00 broadcast exit ! decnet cost 1 clns router iso-igrp comet exit ! router iso-igrp comet net 47.0004.0001.0000.0c00.6666.00 exit ! router igrp 109 network 172.21.0.0 exit ! ip domain-name CISCO.COM
The figure below illustrates a fully meshed network. The configurations for routers A, B, and C follow the figure. In this example, the routers are configured to use PVCs. Fully meshed indicates that any workstation can communicate with any other workstation. Note that the two protocol statements configured in router A identify the ATM addresses of routers B and C. The two protocolstatements in router B identify the ATM addresses of routers A and C. The two protocol statements in router C identify the ATM addresses of routers A and B. For further information, refer to the sections "Creating a PVC" and "Mapping a Protocol Address to a PVC".
Figure 1 | Fully Meshed ATM Configuration Example |
ip routing ! interface atm 4/0 ip address 131.108.168.1 255.255.255.0 pvc 0/32 protocol ip 131.108.168.2 broadcast exit ! pvc 0/33 protocol ip 131.108.168.3 broadcast exit
ip routing ! interface atm 2/0 ip address 131.108.168.2 255.255.255.0 pvc test-b-1 0/32 protocol ip 131.108.168.1 broadcast exit ! pvc test-b-2 0/34 protocol ip 131.108.168.3 broadcast exit
ip routing ! interface atm 4/0 ip address 131.108.168.3 255.255.255.0 pvc 0/33 protocol ip 131.108.168.1 broadcast exit ! pvc 0/34 protocol ip 131.108.168.2 broadcast exit
The following example shows how to enable Inverse ARP on an ATM interface and specifies an Inverse ARP time period of 10 minutes. For further information, refer to the section "Enabling Inverse ARP".
interface atm 2/0 pvc 1/32 inarp 10 exit
The following example shows how to enable ANCP on an ATM subinterface. In the example, ANCP is enabled on ATM subinterface 2/0/1.1.
interface ATM2/0/0.1 point-to-point description ANCP Link to one DSLAM no ip mroute-cache ip address 192.168.0.2 255.255.255.252 pvc 254/32 protocol ip 192.168.0.1 ancp enable no snmp trap link-status
The following example shows how to enable OAM management on an ATM PVC. The PVC is assigned the name routerA and the VPI and VCI are 0 and 32, respectively. OAM management is enabled with a frequency of 3 seconds between OAM cell transmissions. For further information, refer to the section "Enabling ANCP on an ATM Interface".
interface atm 2/0 pvc routerA 0/32 oam-pvc manage 3 oam retry 5 5 10
The following example shows how to configure PVC trap support on your Cisco router:
!For PVC trap support to work on your router, you must first have SNMP support and !an IP routing protocol configured on your router: Router(config)# snmp-server community public ro Router(config)# snmp-server host 171.69.61.90 public Router(config)# ip routing Router(config)# router igrp 109 Router(config-router)# network 172.21.0.0 ! !Enable PVC trap support and OAM management: Router(config)# snmp-server enable traps atm pvc interval 40 fail-interval 10 Router(config)# interface atm 1/0.1 Router(config-if)# pvc 0/1 Router(config-if-atm-vc)# oam-pvc manage ! ! Now if PVC 0/1 goes down, host 171.69.61.90 will receive traps.
For further information, refer to the "Configuring PVC Trap Support" section.
The following example shows how to create a VC class named main and how to configure UBR and encapsulation parameters. For further information, refer to the sections "Creating a VC Class" and "Configuring VC Parameters".
vc-class atm main ubr 10000 encapsulation aal5mux ip
The following example shows how to create a VC class named sub and how to configure UBR and PVC management parameters. For further information, refer to the sections "Creating a VC Class" and "Configuring VC Parameters".
vc-class atm sub ubr 15000 oam-pvc manage 3
The following example shows how to create a VC class named pvc and how to configure VBR-NRT and encapsulation parameters. For further information, refer to the sections "Creating a VC Class" and "Configuring VC Parameters".
vc-class atm pvc vbr-nrt 10000 5000 64 encapsulation aal5snap
The following example shows how to apply the VC class named main to the ATM main interface 4/0. For further information, refer to the section "Applying a VC Class on an ATM PVC".
interface atm 4/0 class-int main exit
The following example shows how to apply the VC class named sub to the ATM subinterface 4/0.5:
interface atm 4/0.5 multipoint class-int sub exit
The following example shows how to apply the VC class named pvc directly on the PVC 0/56:
interface atm 4/0.5 multipoint pvc 0/56 class-vc pvc exit
The following example shows how to enable OAM management on an ATM PVC. The PVC is assigned the name routerA and the VPI and VCI are 0 and 32, respectively. OAM management is enabled with a frequency of 3 seconds between OAM cell transmissions. For further information, refer to the section "Configuring OAM Management for PVCs".
interface atm 2/0 pvc routerA 0/32 oam-pvc manage 3 oam retry 5 5 10 ! interface atm 4/0.1 point-to-point pvc 0/35 exit
No map-group and map-list commands are needed for IP.
interface atm 4/0 ip address 1.1.1.1 255.0.0.0 pvc 1/33 pvc 1/34 pvc 1/35 bridge-group 1 ! bridge 1 protocol dec
Standard |
Title |
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No new or modified standards are supported by this feature, and support for existing standards has not been modified by this feature. |
-- |
MIB |
MIBs Link |
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To locate and download MIBs for selected platforms, Cisco IOS XE software releases, and feature sets, use Cisco MIB Locator found at the following URL: |
RFC |
Title |
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No new or modified RFCs are supported by this feature, and support for existing RFCs has not been modified by this feature. |
-- |
Description |
Link |
---|---|
The Cisco Support website provides extensive online resources, including documentation and tools for troubleshooting and resolving technical issues with Cisco products and technologies. To receive security and technical information about your products, you can subscribe to various services, such as the Product Alert Tool (accessed from Field Notices), the Cisco Technical Services Newsletter, and Really Simple Syndication (RSS) Feeds. Access to most tools on the Cisco Support website requires a Cisco.com user ID and password. |
The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.
Table 1 | Feature Information for Configuring ATM |
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Any Internet Protocol (IP) addresses and phone numbers used in this document are not intended to be actual addresses and phone numbers. Any examples, command display output, network topology diagrams, and other figures included in the document are shown for illustrative purposes only. Any use of actual IP addresses or phone numbers in illustrative content is unintentional and coincidental.