Enterasys Xpedition User Reference Manual 75
Chapter 8
Packet-over-SONET
Configuration Guide
Overview
This chapter explains how to configure and monitor packet-over-SONET (PoS) on the XP.
See the sonet commands section of the Enterasys Xpedition Command Line Interface Reference
Manual for a description of each command.
PoS requires installation of the OC-3c or OC-12c PoS line cards in an XP-8000 or an XP-
8600. The OC-3c line card has four PoS ports, while the OC-12c line card has two PoS
ports. You must use the “so.” prefix for PoS interface ports. For example, you would
specify a PoS port located at router slot 13, port 1 as “so.13.1.”
By default, PoS ports are set for point-to-point protocol (PPP) encapsulation. You cannot
change this encapsulation type for PoS ports.
Note: While PoS ports use PPP encapsulation, other PPP characteristics such as service
profiles, encryption, compression, and MLP bundles are not supported for PoS
ports.
By default, PoS ports are configured to receive a maximum transmission unit (MTU) size
of 1500 octets. The actual MTU size used for transmissions over a PoS link is a result of
PPP negotiation. For transmission of “jumbo frames” (MTUs up to 65535 octets), you can
increase the MTU size of the PoS port. The MTU must be set at the port level.
Configuring IP Interfaces for PoS Links
Configuring IP interfaces for PoS links is generally the same as for WANs and for LANs.
You assign an IP address to each interface and define routing mechanisms such as OSPF
or RIP as with any IP network. You can configure the IP interface on the physical port or
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