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Introduction
An FRM X.25 port can connect to an X.25 DTE or an X.25 network. This allows the
node to transmit X.25 traffic, as well as IP and IPX (encapsulated per RFC 1356), and
SNA (per QLLC).
X.25 support includes:
Full compliance with CCITT Recommendation X.25
Line speeds up to 2.048 Mbps
Full X.121 addressing capability
Address translation
RFC 1356 for IP over X.25
RFC 1490 encapsulation (HDLC)
A T1 X.25 port can contain up to 24 channels, and an E1 port can contain
up to 30 channels.
The FRM also supports logical X.25 ports, which allow multiple legacy protocols
(SDLC, async, bisync, etc.) to be encapsulated via X.25 and transmitted over a single
physical frame relay port. An FRM can contain up to 56 logical ports per RLP, all on
one physical port or spread over several physical ports.
Some things to know about logical ports are:
Encapsulation can be via either T1.617 Annex G or T1.617 RFC1490. You
should know the pros and cons of using each. The explanation of
Method" on page 8-17 offers some help.
Both level-2 and level-3 windows can be configured. (Configuration and oper-
ation is the same for either encapsulation method.)
Chapter 8
Configuring X.25
"Encapsulation
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