Riverstone Networks WICT1-12 - Manual (Page 161)

Riverstone Networks RS Switch Router User Guide Release 8.0 9-1
9 PACKET-OVER-SONET
CONFIGURATION GUIDE
This chapter explains how to configure and monitor Packet-over-SONET (PoS) on the RS. See the
sonet
commands section of the Riverstone RS Switch 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 RS 8000 or an RS 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 the first 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. The only other supported
encapsulation type is bridged Ethernet over PPP.
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 1522 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.
9.1 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 you can configure the interface as part of a VLAN for PoS links. You can
also configure multiple IP addresses for each interface, as described in
Section 11.2, "Configuring IP Interfaces
and Parameters" .
When creating the IP interface for a PoS link, you can either specify the peer address if it is known (static address),
or allow the peer address to be automatically discovered via IPCP negotiation (dynamic address). If the peer
address is specified, any address supplied by the peer during IPCP negotiation is ignored.
IP interfaces for PoS links can have primary and secondary IP addresses. The primary addresses may be either
dynamic or static, but the secondary address must be static. This is because only the primary addresses of both the
local and peer devices are exchanged during IP Control Protocol (IPCP) negotiation.