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This chapter describes how to configure IP over ATM on the ATM switch router. The primary use of IP over ATM is for inband management of the ATM switch router.
This chapter includes the following sections:
This section describes configuring a port on a ATM switch router to allow a classical IP-over-ATM connection to the ATM switch router's route processor.
The following sections describe configuring the ATM switch router for classical IP over ATM in either a switched virtual circuit (SVC) or permanent virtual circuit (PVC) environment.
This section describes classical IP over ATM in an SVC environment. It requires configuring only the device's own ATM address and that of a single ATM Address Resolution Protocol (ARP) server into each client device.
For a detailed description of the role and operation of the ATM ARP server, refer to the Guide to ATM Technology.
In an SVC environment, configure the ATM ARP mechanism on the interface by performing the following steps, beginning in global configuration mode:
| Step | Command | Purpose | ||
|---|---|---|---|---|
| Enables IP host based routing. | |||
| interface atm 0 | Selects the interface to be configured. | ||
| atm nsap-address nsap-address | Specifies the NSAP ATM address of the interface. | ||
| ip address ip-address mask | Specifies the IP address of the interface. | ||
| atm arp-server nsap nsap-address | |||
| exit | Exits interface configuration mode. | ||
| Configures a static route through the ATM switch router to the route processor interface. See the following note. |
| 1Address prefix is first 19 bytes of the NSAP address. |
Figure 12-1shows three ATM switch routers and a router connected using classical IP over ATM.
The following example shows how to configure the route processor interface atm 0 of client A in Figure 12-1, using the NSAP address:
Client A(config)# ip host-routing Client A(config)# interface atm 0 Client A(config-if)# atm nsap-address 47.0091.8100.0000.1111.1111.1111.1111.1111.1111.00 Client A(config-if)# ip address 123.233.45.1 255.255.255.0 Client A(config-if)# atm arp-server nsap 47.0091.8100.0000.1111.1111.1111.2222.2222.2222.00 Client A(config-if)# exit Client A(config)# atm route 47.0091.8100.0000.1111.1111.1111.1111.1111.1111 atm 0 internal
The following example shows how to configure route processor interface atm 0 of client A in Figure 12-1 using the ESI:
Client A(config)# ip host-routing Client A(config)# interface atm 0 Client A(config-if)# atm esi-address 0041.0b0a.1081.40 Client A(config-if)# ip address 123.233.45.1 255.255.255.0 Client A(config-if)# atm arp-server nsap 47.0091.8100.0000.1111.1111.1111.2222.2222.2222.00 Client A(config-if)# exit
Cisco's implementation of the ATM ARP server supports a single, nonredundant server per LIS and one ATM ARP server per subinterface. Thus, a single ATM switch router can support multiple ARP servers by using multiple interfaces.
To configure the ATM ARP server, perform the following steps, beginning in global configuration mode:
| Step | Command | Purpose | ||
|---|---|---|---|---|
| Enables IP host based routing. | |||
| interface atm 0[.interface#] | Selects the interface to be configured. | ||
| atm nsap-address nsap-address | Specifies the NSAP ATM address of the interface. | ||
| ip address ip-address mask | Specifies the IP address of the interface. | ||
| atm arp-server time-out minutes1 | Configures the ATM ARP server optional idle timer. | ||
| Configures a static route through the ATM switch router to the route processor interface. See the following note. |
The idle timer interval is the number of minutes a destination entry listed in the ATM ARP server's ARP table can be idle before the server takes any action to timeout the entry.
The following example configures the route processor interface atm 0 as an ARP server (shown in Figure 12-1):
ARP_Server(config)# ip host-routing ARP_Server(config)# interface atm 0 ARP_Server(config-if)# atm esi-address 0041.0b0a.1081.00 ARP_Server(config-if)# atm arp-server self ARP_Server(config-if)# ip address 123.233.45.2 255.255.255.0
To show the IP-over-ATM interface configuration, use the following EXEC commands:
| Command | Purpose |
|---|---|
Shows the ATM interface ARP configuration. | |
Shows the ATM map list configuration. |
In the following example, the show atm arp-server command displays the configuration of the interface atm 0:
Switch# show atm arp-server
Note that a '*' next to an IP address indicates an active call
IP Address TTL ATM Address
ATM2/0/0:
* 10.0.0.5 19:21 4700918100567000000000112200410b0a108140
The following example displays the map-list configuration of the static map and IP-over-ATM interfaces:
Switch# show atm map
Map list ATM2/0/0_ATM_ARP : DYNAMIC
arp maps to NSAP 36.0091810000000003D5607900.0003D5607900.00
, connection up, VPI=0 VCI=73, ATM2/0/0
ip 5.1.1.98 maps to s 36.0091810000000003D5607900.0003D5607900.00
, broadcast, connection up, VPI=0 VCI=77, ATM2/0/0
Map list ip : PERMANENT
ip 5.1.1.99 maps to VPI=0 VCI=200
This section describes how you configure classical IP over ATM in a PVC environment. The ATM Inverse ARP (InARP) 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.
In a PVC environment, configure the ATM InARP mechanism by performing the following steps, beginning in global configuration mode:
| Step | Command | Purpose | ||
|---|---|---|---|---|
| Enables IP host based routing. | |||
| interface atm 0 | Selects the interface to be configured. | ||
| ip address ip-address mask | Specifies the IP address of the interface. | ||
| atm pvc vpi1 vci encap aal5snap [inarp minutes] |
| 1The VPI value on interface atm 0 must always be 0. |
Repeat these tasks for each PVC you want to create.
The inarp minutes interval specifies how often Inverse ARP datagrams are sent on this virtual circuit. The default value is 15 minutes.
The following example shows how to configure an IP-over-ATM interface on interface atm 0, using a PVC with AAL5SNAP encapsulation, inverse ARP set to ten minutes, VPI = 0, and VCI = 100:
Switch(config)# ip host-routing Switch(config)# interface atm 0 Switch(config)# ip address 11.11.11.11 Switch(config-if)# atm pvc 0 100 encap aal5snap inarp 10 interface atm 0/0/0 50 100
To show the IP-over-ATM interface configuration, use the following EXEC command:
| Command | Purpose |
|---|---|
Shows the ATM interface ARP configuration. |
The following example displays the map-list configuration of the static map and IP-over-ATM interfaces:
Switch# show atm map
Map list yyy : PERMANENT
ip 1.1.1.2 maps to VPI=0 VCI=200
Map list zzz : PERMANENT
Map list a : PERMANENT
Map list 1 : PERMANENT
Map list ATM2/0/0_ATM_ARP : DYNAMIC
arp maps to NSAP 47.009181005670000000001122.00410B0A1081.40
, connection up, VPI=0 VCI=85, ATM2/0/0
ip 10.0.0.5 maps to NSAP 47.009181005670000000001122.00410B0A1081.40
, broadcast, ATM2/0/0
The ATM interface supports a static mapping scheme that identifies the ATM address of remote hosts or ATM switch routers. This IP address is specified as a PVC or as an NSAP address for SVC operation.
The following sections describe configuring both PVC-based and SVC-based map lists on the ATM switch router. For a more detailed discussion of static map lists, refer to the Guide to ATM Technology.
Configurations for both PVC and SVC map lists are described in the following sections:
This section describes how to map a PVC to an address, which is a required task if you are configuring a PVC.
You enter mapping commands as groups. You first create a map list and then associate it with an interface. Perform the following steps, beginning in global configuration mode:
| Step | Command | Purpose |
|---|---|---|
| 1 | Enables IP host based routing. | |
| 2 | interface atm card/subcard/port[.interface#] | Specifies an ATM interface and enters interface configuration mode. |
| 3 | ip address ip-address mask | Enters the IP address and subnet mask associated with this interface. |
| 4 | map-group name | Enters the map group name associated with this PVC. |
| 5 | atm pvc vpi-a vci-a [encap aal-encap] [upc upc] [pd pd] [rx-cttr index] [tx-cttr index] interface atm card/subcard/port[.vpt#] vpi-b vci-b [upc upc] | Configures the PVC. |
| 6 | exit | Exits interface configuration mode. |
| 7 | ip route ip-address mask | Configures an IP route to the router. |
| 8 | map-list name | Creates a map list by naming it, and enters map-list configuration mode. |
| 9 | ip ip-address {atm-nsap address | atm-vc vci} [aal5mux encapsulation] [broadcast pseudo-broadcast] [class class-name] | Associates a protocol and address to a specific virtual circuit. |
You can create multiple map lists, but only one map list can be associated with an interface. Different map lists can be associated with different interfaces.
Figure 12-2 illustrates a connection configured with a PVC map list.
The following example shows the commands used to configure the connection in Figure 12-2.
Switch(config)# ip host-routing Switch(config)# interface atm 0 Switch(config-if)# ip address 1.1.1.1 255.0.0.0 Switch(config-if)# map-group yyy Switch(config-if)# atm pvc 0 200 encap aal5snap interface atm 3/0/0 100 300 Switch(config-if)# exit Switch(config)# ip route 1.1.1.1 255.0.0.0 1.1.1.2 Switch(config)# map-list yyy Switch(config-map-list)# ip 1.1.1.2 atm-vc 200
To show the map-list interface configuration, use the following command:
| Command | Purpose |
|---|---|
Shows the ATM interface map-list configuration. |
The following example displays the map-list configuration at interface atm 0:
Switch# show atm map Map list yyy : PERMANENT ip 1.1.1.2 maps to VPI=0 VCI=200
This section describes how to map an SVC to an NSAP address. This is a required task if you are configuring an SVC.
You enter mapping commands as groups. You first create a map list and then associate it with an interface. Perform the following steps, beginning in global configuration mode:
| Step | Command | Purpose |
|---|---|---|
| 1 | Enables IP host-based routing. | |
| 2 | interface atm card/subcard/port[.interface#] | Specifies an ATM interface and enters interface configuration mode. |
| 3 | ip address ip-address mask | Enters the IP address and subnet mask associated with this interface. |
| 4 | atm nsap-address nsap-address | Configures the interface NSAP address. |
| 5 | map-group name | Enters the map-group name associated with this PVC. |
| 6 | exit | Exits interface configuration mode. |
| 7 | map-list name | Creates a map list by naming it, and enters map-list configuration mode. |
| 8 | ip ip-address {atm-nsap address | atm-vc vci} [aal5mux encapsulation] [broadcast pseudo-broadcast] [class class-name] | Associates a protocol and address to a specific virtual circuit. |
You can create multiple map lists, but only one map list can be associated with an interface. Different map lists can be associated with different interfaces.
Figure 12-3 illustrates an SVC connection configured with a map list.
The following example shows the commands used to configure the connection in Figure 12-3:
Switch(config)# ip host-routing Switch(config)# interface atm 0 Switch(config-if)# ip address 1.1.1.1 255.0.0.0 Switch(config-if)# atm nsap-address 47.0091.1111.1111.1111.1111.1111.1111.1111.1111.00 Switch(config-if)# map-group zzz Switch(config-if)# exit Switch(config)# map-list zzz Switch(config-map-list)# ip 1.1.1.2 atm-nsap 39.1533.2222.2222.2222.2222.2222.2222.2222.2222.00
To show the map-list interface configuration, use the following EXEC command:
| Command | Purpose |
|---|---|
Shows the ATM interface map-list configuration. |
The following example displays the map-list configuration at interface atm 0:
Switch# show atm map Map list zzz : PERMANENT ip 1.1.1.2 maps to NSAP AC.153322222222222222222222.222222222222.00
Posted: Mon May 8 18:18:36 PDT 2000
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