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Table Of Contents
Link Aggregation (FEC, GEC, and POS)
ML-Series Card Overview
This chapter provides an overview of the ML1000-2 and ML100T-12 cards for the ONS 15454 (SONET) and ONS 15454 SDH. It lists Ethernet and SONET/SDH capabilities and Cisco IOS and Cisco Transport Controller (CTC) software features, with brief descriptions of selected features.
This chapter contains the following major sections:
ML-Series Card Description
The ML-Series cards are independent Gigabit Ethernet (ML1000-2) or Fast Ethernet (ML100T-12) Layer 3 switches that process up to 5.7 Mpps. The cards are integrated into the ONS 15454 SONET or the ONS 15454 SDH. An ONS 15454 SONET with a 10-Gigabit Cross-Connect card (XC10G) can host the card in any traffic card slot, but an ONS 15454 SONET with a Cross-Connect card (XC) or Cross Connect Virtual Tributary card (XCVT) can only host the ML-Series card in the four traffic slots. An ONS 15454 SDH can host the card in any traffic card slot with any cross-connect card.
The card ships loaded with Cisco IOS Release 12.2(18)SO, and the Cisco IOS command-line interface (CLI) is the primary user interface for the ML-Series card. Most configuration for the card, such as Ethernet port, bridging, and VLAN, can be done only via the Cisco IOS CLI.
However, Cisco Transport Controller (CTC), the ONS 15454 SONET/SDH graphical user interface (GUI), also supports the ML-Series card. SONET/SDH circuits cannot be provisioned through Cisco IOS, but must be configured through CTC or TL1. CTC offers ML-Series card status information, SONET/SDH alarm management, Cisco IOS Telnet session initialization, Cisco IOS configuration file management, provisioning, inventory, and other standard functions.
The ML100T-12 features twelve RJ-45 interfaces, and the ML1000-2 features two Small Form-factor Pluggable (SFP) slots supporting short wavelength (SX) and long wavelength (LX) optical modules. The ML100T-12 and the ML1000-2 use the same hardware and software base and offer the same feature sets. For detailed card specifications, refer to the "Ethernet Cards" chapter of the Cisco ONS 15454 Reference Manual or the Cisco ONS 15454 SDH Reference Manual.
The ML-Series card features two virtual Packet-over-SONET/SDH (POS) ports, which function in a manner similar to OC-N card ports. The SONET/SDH circuits are provisioned through CTC in the same manner as standard OC-N card circuits. The ML-Series POS ports supports virtual concatenation (VCAT) of SONET/SDH circuits and a software link capacity adjustment scheme (SW-LCAS).
ML-Series Feature List
The ML100T-12 and the ML1000-2 cards have the following features:
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Key ML-Series Features
This section describes selected key features and their implementation on the ML-Series cards.
Cisco IOS
Cisco IOS controls the data functions of the ML-Series cards and comes preloaded on the ONS 15454 SONET/SDH Advanced Timing, Communications, and Control (TCC2) card and Advanced Timing, Communications, and Control Plus (TCC2P) card. Users cannot update the ML-Series Cisco IOS image in the same manner as the Cisco IOS system image on a Cisco Catalyst Series. An ML-Series Cisco IOS image upgrade is accomplished only through the ONS 15454 SONET/SDH CTC, and Cisco IOS images for the ML-Series cards are available only as part of an ONS 15454 SONET or SDH software release. This Cisco IOS image is included on the standard ONS 15454 SONET/SDH System Software CD under the package file name M_I.bin and full file name ons15454m-i7-mz. The images are not available for download or shipped separately.
GFP-F Framing
GFP defines a standard-based mapping of different types of services onto SONET/SDH. The ML-Series and CE-Series support frame-mapped GFP (GFP-F), which is the PDU-oriented client signal adaptation mode for GFP. GFP-F maps one variable length data packet onto one GFP packet.
GFP is composed of common functions and payload specific functions. Common functions are those shared by all payloads. Payload-specific functions are different depending on the payload type. GFP is detailed in the ITU recommendation G.7041.
DRPRI
The bridge-group protocol DRPRI is an RPR mechanism that interconnects rings for protection from ONS node failure. The protocol provides two parallel connections of the rings linked by a special instance of RSTP. One connection is the active node and the other is the standby node. During a failure of the active node, link, or card, a proprietary algorithm detects the failure and causes a switchover to the standby node. DRPRI provides a less than 200-msec recovery time for Layer 2 bridged traffic when the ML-Series cards use the enhanced microcode image. The Layer 2 recovery time is up to 12 seconds for other microcode images. The recovery time for Layer 3 unicast and multicast traffic also depends on the convergence time of the routing protocol implemented regardless of the microcode image used.
EoMPLS
EoMPLS provides a tunneling mechanism for Ethernet traffic through an MPLS-enabled Layer 3 core. It encapsulates Ethernet protocol data units (PDUs) inside MPLS packets and using label stacking forwards them across the MPLS network. EoMPLS is an Internet Engineering Task Force (IETF) standard-track protocol based on the Martini draft. EoMPLS allows service providers to offer customers a virtual Ethernet line service or VLAN service using the service provider's existing MPLS backbone.
Link Aggregation (FEC, GEC, and POS)
The ML-Series offers Fast EtherChannel, Gigabit EtherChannel, and 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 POS channel. 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.
RMON
The ML-Series card features remote monitoring (RMON) that allows network operators to monitor the health of the network with a network management system (NMS). The ML-Series card Ethernet interfaces support RMON for statistics, utilization, and history.For general information about using Cisco IOS to manage RMON, refer to the "Configuring RMON Support" chapter of the Cisco IOS Configuration Fundamentals Configuration Guide.
The MIBs supported are:
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RPR
RPR is an emerging network architecture designed for metro fiber ring networks. This new MAC protocol is designed to overcome the limitations of STP, RSTP, and SONET in packet-based networks. RPR convergence times are comparable to SONET and much faster than STP or RSTP. RPR operates at the Layer 2 level and is compatible with Ethernet and protected or unprotected SONET circuits.
SNMP
Both the ONS 15454 SONET/SDH and the ML-Series cards have SNMP agents and support SNMP Version 1 (SNMPv1) and SNMP Version 2c (SNMPv2c) sets and traps. The ONS 15454 SONET/SDH accepts, validates, and forwards get/getNext/set requests to the ML-Series through a proxy agent. The ML-Series requests contain the slot identification of the ML-Series cards to distinguish the request from a general ONS 15454 SNMP request. Responses from the ML-Series are relayed by the ONS 15454 to the requesting SNMP agents.
The ML-Series card SNMP support includes:
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TL1
TL1 on the ML-Series cards can be used for card inventory, fault or alarm management, card provisioning, and retrieval of status information for both data and SONET ports. TL1 can also be used to provision SONET STS circuits and transfer a Cisco IOS startup configuration file to the TCC2/TCC2P card memory. For specific TL1 commands and general TL1 information, refer to the Cisco ONS SONET TL1 Command Guide.
VRF Lite
VPN Routing/Forwarding Lite (VRF Lite) is an ML-Series card-specific implementation of a VPN routing/forwarding instance (VRF). Unlike standard VRF, VRF Lite does not contain Multi-Protocol internal BGP (MP-iBGP).
Standard VRF is an extension of IP routing that provides multiple routing instances and separate IP routing and forwarding tables for each VPN. VRF is used in concert with internal MP-iBGP. MP-iBGP distributes the VRF information between routers to provide Layer 3 MPLS-VPN.
VRF Lite stores VRF information locally and does not distribute the VRF information to connected equipment. VRF information directs traffic to the correct interfaces and subinterfaces when the traffic is received from customer routers or from service provider router(s).
VRF Lite allows an ML-Series card, acting as customer equipment, to have multiple interfaces and subinterfaces with service provider equipment. The customer ML-Series card can then service multiple customers. Normal customer equipment serves a single customer.
Posted: Mon Dec 3 03:10:27 PST 2007
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