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13-2
ATM Switch Router Software Configuration Guide
OL-7396-01
Chapter 13 Configuring IP over ATM
Configuring Classical IP over ATM
The ATM switch router can be configured as an ATM ARP client 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.
Note Since the 12.0(1a)W5(5b) release of the system software, addressing the interface on the route processor
has changed. The ATM interface is now called atm0, and the Ethernet interface is now called ethernet0.
The old formats (atm 2/0/0 and ethernet 2/0/0) are still supported.
Command Purpose
Step 1
Switch(config)# interface atm 0
Switch(config-if)#
or
Switch(config)# interface atm card/subcard/port
Switch(config-if)#
Selects the route processor interface.
or
If you are using the optional Catalyst 8540 MSR
enhanced ATM router module, specifies the ATM
interface number.
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 0 |
atm card/subcard/port} internal
1. Address prefix is first 19 bytes of the NSAP address.
Configures a static route through the ATM switch
router to the route processor interface, or the
optional Catalyst 8540 MSR enhanced ATM
router module interface. See the following note.