Network Router User Manual

SmartSwitch Router User Reference Manual 57
Chapter 6
Packet-over-SONET
Configuration
Guide
Overview
This chapter explains how to configure and monitor packet-over-SONET (PoS) on the
SSR. See the sonet commands section of the SmartSwitch Router 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 SSR 8000 or an SSR
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.