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Configuring I/O Modules

Extreme Networks Consolidated Hardware Guide 263

Figure 133: Showing the components and LEDs of the MPLS module

Summary of Features

The MPLS module includes the following features:

• MPLS

• IP unicast forwarding (with selective longest prefix match)

• Destination-sensitive accounting

MPLS. MultiProtocol Label Switching (MPLS) is a forwarding algorithm that uses short, fixed-length

labels to make next-hop forwarding decisions for each packet in a stream.

MPLS is a technology that allows routers to make protocol-independent forwarding decisions based on

fixed-length labels. The use of MPLS labels enables routers to avoid the processing overhead of delving

deeply into each packet and performing complex route lookup operations based upon destination IP

addresses.

In an MPLS environment, incoming packets are initially assigned “labels” by a Label Edge Router

(LER). The labels allow the packets to be more efficiently handled by MPLS-capable routers at each

point along the forwarding path.

An MPLS label essentially consists of a short fixed-length value carried within each packet header and

that identifies a Forwarding Equivalence Class (FEC). The FEC tells the router how to handle the

packet. An FEC is defined to be a group of packets that are forwarded in the same manner. Examples of

FECs include an IP prefix, a host address, or a VLAN ID. The label concept in MPLS is analogous to

other connection identifiers, such as an ATM VPI/VCI or a Frame Relay DLCI.

PoS_002

MPLS_15

Ejector/injector

handle

Service ports

Module status LED

General Purpose Processor (GPP)

Module diagnostics LED

Captive

retaining screw

Network processors

and heat sinks

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Extreme Networks WM-4T1i Spezifikationen Seite 263