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Cisco ONS 15454 SONET/SDH ML-Series Multilayer Ethernet Card Software Feature and Configuration Guide, R4.0
78-15224-02
Chapter 1 Overview
Understanding Key Features
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IRB routing mode support
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Simple Network Management Protocol (SNMP)
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Transaction Language 1 (TL1)
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Cisco IOS
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NEBS3 compliant
Understanding Key Features
This section describes selected key features of the ML-Series.
SONET/SDH Port Encapsulation (HDLC, PPP/BCP, and LEX)
The ML-Series supports three forms of SONET/SDH port encapsulation: Cisco HDLC, PPP/BCP and
LEX. Cisco HDLC is standard on most Cisco data devices. It does not offer VLAN trunking support.
PPP/BCP is a popular standard linked to RFC 2878. It supports VLAN trunking via BCP. LEX is a
protocol used by the G-Series cards. This protocol supports VLAN trunking and is based on PPP over
HDLC.
This allows the ML-Series to connect to the OC-N ports of switches and routers supporting POS, as well
as the G-Series Ethernet cards on the Cisco ONS 15454 SONET, ONS 15454 SDH, and ONS 15327. All
three formats support bridging and routing, standard SONET/SDH payload scrambling, and HDLC
frame check sequence.
Link Aggregation (FEC, GEC, and POS)
The ML-Series offers Fast EtherChannel, Gigabit EtherChannel, and Packet-over-SONET/SDH (POS)
channel link aggregation. Link aggregation groups multiple ports into a larger logical port and provides
resiliency during the failure of any individual ports. The ML-Series supports a maximum of four
Ethernet ports in Fast EtherChannel, two Ethernet ports in Gigabit EtherChannel, and two SONET/SDH
virtual ports in the POS channel. The POS channel is only supported with LEX encapsulation.
Traffic flows map to individual ports based on MAC source address (SA)/destination address (DA) for
bridged packets and IP SA/DA for routed packets. There is no support for policing or class-based packet
priorities when link aggregation is configured.
SONET Circuits
On the ONS 15454 SONET, ML-Series cards features two SONET virtual ports with a maximum
combined bandwidth of STS-48. Each port carries an STS circuit with a size of STS-1, STS-3c, STS-6c,
STS-9c, STS-12c, or STS-24c.
SDH Circuits
On the ONS 15454 SDH, ML-Series cards features two SDH virtual ports with a maximum combined
bandwidth of VC4-16c. Each port carries an STM circuit with a size of VC4, VC4-2C, VC4-3C,
VC4-8C, or VC4-16c.
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