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24-20
ATM and Layer 3 Switch Router Software Configuration Guide
OL-1911-05
Chapter 24 Configuring ATM Router Module Interfaces
Configuring Classical IP over ATM in an SVC Environment
For a detailed description of the role and operation of the ATM ARP server, refer to the Guide to ATM
Technology.
The ATM switch router can be configured as an ATM ARP client, thereby being able to work with any
ATM ARP server conforming to RFC 1577. Alternatively, one of the ATM switch routers in a logical IP
subnet (LIS) can be configured to act as the ATM ARP server itself. In that case, it automatically acts as
a client as well. The following sections describe configuring the ATM switch router in an SVC
environment as either an ATM ARP client or an ATM ARP server.
Configuring as an ATM ARP Client
In an SVC environment, configure the ATM ARP mechanism on the interface by performing the
following steps, beginning in global configuration mode:
Note The end system identifier (ESI) address form is preferred, in that it automatically handles the
advertising of the address. Use the network service access point (NSAP) form of the command when
you need to define a full 20-byte unique address with a prefix unrelated to the network prefix on that
interface. You only need to specify a static route when configuring an ARP client using an NSAP
address.
Command Purpose
Step 1
Switch(config)# interface atm card/subcard/port
Switch(config-if)#
Selects the ATM router module interface.
Step 2
Switch(config-if)# atm nsap-address
nsap-address
or
Switch(config-if)# atm esi-address esi.selector
Specifies the network service access point
(NSAP) ATM address of the interface.
or
Specifies the end-system-identifier (ESI) address
of the interface.
Step 3
Switch(config-if)# ip address ip-address mask Specifies the IP address of the interface.
Step 4
Switch(config-if)# atm arp-server nsap
nsap-address
Specifies the ATM address of the ATM ARP
server.
Step 5
Switch(config-if)# exit
Switch(config)#
Exits interface configuration mode.
Step 6
Switch(config)# atm route addr-prefix
1
atm
card/subcard/port internal
1. The address prefix is the first 19 bytes of the NSAP address.
Configures a static route through the ATM router
module interface. See the note that follows this
table.