The Alcatel-Lucent 7450 Ethernet Service Switch Group in .NET

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The Alcatel-Lucent 7450 Ethernet Service Switch Group
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Both the Alcatel-Lucent 7750 SR and 7450 Ethernet Service Switch (ESS) share the same robust service management, troubleshooting, and billing features. The 7450 ESS is based on the same technology foundation as the 7750 SR, but there are key differences between the two products. For example, the MDAs, IOMs, and fabric modules are not interchangeable between the two systems. The two product families
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C h a p t e r 2 n t h e a l Cat e l - luC e n t 7750 S r a n d 7450 e S S C o m p on e n t S
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have completely different chassis and modules, separate part numbers and list prices, distinct product feature roadmaps, and separate software loads. The Alcatel-Lucent 7450 ESS capabilities are focused on enabling the delivery of metro Ethernet services only and do not support Layer 3 services such as MPLS/BGP vPns and multicast. The 7450 ESS is also missing key functionality and scalability attributes such as BGP4 that are required in an edge router. Because of the differences in hardware architecture, there is no upgrade path to the Alcatel-Lucent 7750 SR or to a Provider Edge (PE) router. Like the Alcatel-Lucent 7750 SR series, the Alcatel-Lucent 7450 ESS series has a variety of form factors that allows for deployment in diverse scenarios depending on the exact port density and aggregation technologies that are required. There are four different form factors in the Alcatel-Lucent ESS family. The 7450 ESS-12 (shown in Figure 2.4) is the largest and has a total of 12 front access card slots. Two card slots are dedicated for SF/CPM cards, and the remaining 10 slots can be used for any combination of IOM cards, just as with the 7750 SR-12.
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Figure 2.4 The Alcatel-Lucent 7450 ESS-12. Two slots are dedicated for SF/CPM control cards; the other 10 slots are available for I/O Modules that provide network interfaces.
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ESS 12
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The Alcatel-Lucent 7450 ESS-7 and ESS-6 (shown in Figure 2.5) similarly provide two dedicated slots for the SF/CPM cards and five and four remaining slots for IOM cards, respectively. The ESS-7 and ESS-6 also have an integrated switching system with 100 Gbps and 80 Gbps (full-duplex) of throughput, respectively. There is also an Alcatel-Lucent 7450 ESS-1 that is similar to the Alcatel-Lucent 7750 SR-1: it has the management, switch fabric, and one IOM base board integrated into the chassis. As with the 7750 SR-1, the IOM base board can accommodate two MDAs for physical interfaces and has an integrated switching system with 20 Gbps (full-duplex) of throughput.
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2.1 T h E A L CAT E L -LuC E n T 7750 S E Rv IC E ROu T E R FA M I LY
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Figure 2.5 The Alcatel-Lucent 7450 ESS-7 and ESS-6. Two slots are dedicated for SF/CPM control cards for both models. The other slots are available for I/O Modules that provide network interfaces.
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The differences between the Alcatel-Lucent 7750 SR series and the Alcatel-Lucent 7450 ESS series are summarized in Table 2.1.
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Table 2.1 Differences between the Alcatel-Lucent 7750 SR Series and 7450 ESS Series
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Type Purpose Platforms Redundancy Pwr/Control MDA
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7450 Ethernet Service Switch Primarily designed to support Ethernet aggregation services ESS-1, ESS-6, ESS-7, and ESS-12 ESS-6, ESS-7, and ESS-12 Ethernet, POS
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7750 Service Router Supports Ethernet, ATM, FrameRelay, and VPRN services. SR-1, SR-7, and SR-12 SR-7 and SR-12 All Ethernet, ATM, POS, DS3/OC3 channelized
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Control Plane versus Data Plane
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One important architectural feature of the Alcatel-Lucent 7750 SR and 7450 ESS is the separation of control functions and data functions. Data functions involve the reception, processing, and forwarding of user application traffic. Data coming in from the remote network/customer site ingresses through the Media Dependent Adapters (MDAs), where the data is formatted (internal format). The data is then processed in the I/O Module, where the decision to switch happens (L2/L3 Forwarding information lookup) and the data packets are sent to the switch fabric (SF/CPM card). The switch fabric then forwards the data to the appropriate IOM, where it is sent to the appropriate egress MDA. Data plane operations happen only after the control plane has built the forwarding information and stored it in the IOM.
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