Configuring IPoA
To enable the upper-layer protocols to find a remote device by its IP address, map the IP address of the remote device to the local PVC or PVC group.
To configure an IP mapping, use one of the following methods:
Static IP address mapping—Maps the IP address of the remote interface to the PVC or PVC group.
Default mapping—If a packet cannot find the mapping for the next hop address, the packet is transmitted through the PVC or PVC group configured with the default mapping.
InARP mapping—Uses Inverse Address Resolution Protocol (InARP) to resolve the IP address of the remote interface that is connected to the local PVC or PVC group. You do not need to configure a static IP address for the PVC or PVC group. Figure 43 shows the InARP working process. The IP addresses are the IP addresses of the ATM interfaces to which the PVC or PVC group belongs.
Figure 43: InARP working process
Follow these guidelines when you configure IPoA:
All encapsulation types support IPoA mapping, but only aal5snap supports InARP mapping. You cannot configure InARP mapping when aal5mux or aal5nlpid is used.
Multiple IP addresses can be mapped to the same PVC or PVC group. You can configure static IP mapping, default mapping, and InARP mapping at the same time. Different PVCs or PVC groups on the same interface cannot be mapped to the same IP address. The PVCs or PVC groups on the same interface can be configured with only one default mapping.
If the interfaces of two routers are connected back-to-back, the local PVC mapped to the remote IP address must have the same VPI/VCI value as the remote PVC mapped to the local IP address.
To configure IPoA:
Step | Command | Remarks |
|---|---|---|
1. Enter system view. | system-view | N/A |
2. Enter ATM interface view or ATM subinterface view. | interface atm { interface-number | interface-number.subnumber } | N/A |
3. Enter PVC view or PVC group view. |
| N/A |
4. Configure an IPoA mapping to enable the PVC or PVC group to carry IP packets. | map ip { ip-address | default | inarp [ minutes ] } | By default, no mappings exist. |
5. (Optional.) Enable the broadcast attribute for the PVC or PVC group. | broadcast | By default, the broadcast attribute is disabled. On an ATM interface, multicast or broadcast packets are sent through all PVCs or PVC groups that have the broadcast attribute enabled. You must configure this command on a PVC or PVC group where broadcast or multicast packets must be sent. |