25-18
ATM Switch Router Software Configuration Guide
OL-7396-01
Chapter 25
Configuring ATM Router Module Interfaces
Configuring Multiprotocol Encapsulation over ATM
Configuring Multiprotocol Encapsulation over ATM
This section describes how to configure multiprotocol encapsulation over ATM, as defined in RFC 1483,
on the ATM router module.
The primary use of multiprotocol encapsulation over ATM, also know as RFC 1483, is carrying multiple
Layer 3 and bridged frames over ATM. RFC 1483 traffic is routed through an ATM router module
interface using static map lists. Static map lists provide an alternative to using the ATM Address
Resolution Protocol (ARP) and ATM Inverse ARP (InARP) mechanisms. For more information on static
map lists, see
Chapter 13, “Configuring IP over ATM.”
For a detailed description of multiprotocol encapsulation over ATM, refer to the
Guide to ATM
Technology.
Note
Traffic shaping and policing are not supported on the ATM router module interfaces; for traffic shaping
and policing on ATM connections, use VP tunnels. For more information on VP tunnels, see
Chapter 7,
“Configuring Virtual Connections.”
To configure multiprotocol encapsulation over ATM on the ATM router module interface, use the
following commands, beginning in global configuration mode:
Example
The following example shows how to configure RFC 1483 on an ATM router module interface,
beginning in global configuration mode:
Switch(config)#
interface atm 1/0/0.1011 multipoint
Command
Purpose
Step 1
Switch(config)#
interface atm
card
/
subcard
/
port
.
subinterface#
multipoint
Switch(config-subif)#
Creates the ATM router module
point-to-multipoint subinterface and enters
subinterface mode.
Note
The ATM router module only supports
point-to-multipoint subinterfaces.
Step 2
Switch(config-subif)#
ip address
ip-address mask
Enters the IP address and subnet mask associated
with this interface.
Step 3
Switch(config-subif)#
map-group
name
Enters the map group name associated with this
PVC.
Step 4
Switch(config-subif)#
atm pvc 2
vci-a
[
upc
upc
]
[
pd
pd
] [
rx-cttr
index
] [
tx-cttr
index
]
interface
atm
card
/
subcard
/
port
[
.
vpt#
]
vpi-b vci-b
[
upc
upc
]
encap
{
aal5mux
1
|
aal5snap
}
1.
Only the Catalyst 8540 MSR enhanced ATM router module supports AAL5 MUX encapsulation.
Configures the PVC.
Note
The VPI number on the ATM router
module interface must be 2.
Step 5
Switch(config-subif)#
exit
Switch(config)#
Returns to global configuration mode.
Step 6
Switch(config)#
map-list
name
Switch(config-map-list)#
Creates a map list by naming it, and enters
map-list configuration mode.
Step 7
Switch(config-map-list)#
ip
ip-address
{
atm-nsap
address
|
atm-vc
vci
} [
broadcast
]
Associates a protocol and address with a specific
virtual circuit.
