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Configuring with PVCs
PVCs in ATM-attached hosts, gateways, and switches must be configured by users. For
environments requiring the transfer of several protocols over the same VCI or support
for inverse ARP (address resolution protocol) requests, LLC (logical link control),
encapsulation is provided. If LLC support is enabled, the system issues inverse ARP
requests on the VPI:VCI connection to automatically discover the destination's IP
address. This request is issued every minute until the destination IP address is found.
After the destination IP address is found, inverse ARP requests are issued every 15
minutes to verify that the connection has not changed. If automatic destination address
discovery by inverse ARP is either declined or not supported at the destination, the
destination IP address must be specified.
Networking with ATM SVCs
Networking with ATM SVCs (switched virtual circuits) is different from networking with
ATM PVCs. PVCs are created by users during configuration of ATM-attached hosts,
gateways, and switches. These static connections remain established until they are
removed by configuration changes. To establish complete connectivity, a connection
must be configured and maintained from each node to every other node. This process
can become labor-intensive as the number of connections grows rapidly with the
addition of nodes. Such complexity is avoided by using SVCs.
An IP subnet using SVCs consists of an ATM switch, an ARP server, and ARP clients.
During network initialization, endpoints automatically open signaling channels to obtain
their 20-byte ATM address from the switch. Using the ARP server ATM address
provided by the user at the time of configuration, clients open a connection with the
subnet's ARP server and register both their IP and ATM addresses.
Note: Each subnet requires one ATM ARP server. When a client station needs to
Changing ATM Adapter Characteristics
The 64-bit/66MHz PCI ATM MMF Adapter characteristics are automatically set during
system boot, and these settings provide optimum performance. If you are an
experienced user and want to change the adapter characteristics, use the following
instructions:
To change the default ATM adapter characteristics, do the following:
1. At the AIX command prompt, type:
smitty atm_adpt
and press Enter.
14
Installation and Using Guide
transmit to another station, the ARP server is called. If the destination's IP
address is registered with the server, the destination's ATM address is resolved.
The caller now has the destination ATM address and will request a connection to
that station through the ATM switch. The switch creates a VPI:VCI connection
from the caller to the destination.
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