ATM Configuration and Troubleshooting Guide

Supported Standards
Internet RFCs
Chapter 12 319
Internet RFCs
The internet-related RFCs supported by the ATM adapters are listed
below.
RFC 1483 RFC 1483 defines two encapsulation methods for carrying network
interconnect traffic over AAL5:
• LLC type 1 encapsulation.
• VC-based multiplexing.
The HP ATM adapters support LLC encapsulation type 1 for IP traffic
and VC-based multiplexing.
RFC 1577 The goal of RFC 1577 is to allow compatible and interoperable
implementation for transmitting IP datagrams and ATM Address
Resolution Protocol (ATM ARP) requests and replies over the ATM
adaptation layer AAL5. The HP-HSC and HP-PCI ATM adapters
implement both client and server parts of RFC 1577.
RFC 1626 The HP ATM adapters support only the default MTU size for IP
fragments (9180 bytes), even after size negotiation.
TCP/IP The HP ATM adapters support the TCP/IP stack and IP networking.
Only one IP address is assigned to the ATM adapter. The ATM
workgroup is considered as a Logical IP Subnet (also called a LIS).
During configuration, a subnet mask is assigned to the interface. The
subnet mask and the IP address define the range of IP addresses
attached to the ATM workgroup. The HP-UX system can belong to
multiple subnets, but an ATM adapter belongs to a single subnet only.
Note that inter-subnet communication requires a router.
RFC 1755 RFC 1755 describes how implementations of IP over ATM should use
ATM call-control signalling procedures.
The HP-HSC and HP-PCI ATM adapters support ATM signalling for IP
over ATM, although RFC 1755 assumes that the ATM node is using UNI
3.0, 3.1, or 4.0 signalling.