Transcript Advanced Networks

Advanced Network
Architectures
Yasaman Motakef
([email protected])
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Overview:
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IP Forwarding Architectures
Switched Forwarding
Classical IP Over ATM (CLIP)
LAN Emulation (LANE)
Next Hop Resolution Protocol (NHRP)
Multi Protocol Over ATM (MPOA)
Multi Protocol Label Switching (MPLS)
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IP Forwarding Architectures
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Switched Forwarding
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Overlay Model
CLIP (Classical IP Over ATM)
 MPOA (Multi Protocol Over ATM)
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Peer Model
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MPLS (Multi Protocol Label Switching)
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Classical IP Over ATM (CLIP)
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Classical IP Over ATM Model
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LAN Emulation (LANE)
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Legacy LAN and LANE Protocol Stacks
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LANE Components
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LEC (LAN Emulation Client)
LES (LAN Emulation Server)
BUS (Broadcast and Unknown Server)
LECS (LAN Emulation Configuration Server)
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LANE Configuration
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Next Hop Resolution Protocol
(NHRP)
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NHRP Components
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NHC (Next Hop Client)
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NHS (Next Hop Server)
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NHRP and CLIP Compared
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While waiting for the NHRP resolution
reply, S has three options:
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Drop the data packet.
Retain the packet until the reply
comes back.
Forward the packet along the routed
path toward node D.
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Multi Protocol Over ATM
(MPOA)
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MPOA Components
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ED (Edge Devices)
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MPC (MPOA Client)
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MPS (MPOA Server)
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Example of Network Topology
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Request Process
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Reply Process
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Data Transfer Through Shortcut VCC
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Multi Protocol Label Switching
(MPLS)
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Label Switching Provides:
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Low-cost hardware implementation.
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Scalability to very high speeds.
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Flexibility in the management of traffic
flows.
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MPLS Separates Control and
Forwarding Components
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Fundamentals of Labels
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A label identifies a virtual circuit between
two neighboring LSRs.
The meaning of a label is significant only
between the two neighboring LSRs.
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Fundamentals of Labels cntd.
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A sequence of LSRs that is to be
followed by a packet is called a labelswitched path (LSP).
A group of packets that are forwarded
in the same manner are said to belong
to the same forwarding equivalence
class(FEC).
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MPLS labels in ATM and
PPP/LAN
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Label Assignment Process
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Control traffic:
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Topology driven label assignment.
Request driven label assignment.
Data traffic:
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Traffic-driven label assignment.
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Label Stack
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VC Merging
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Output streams for VC
merging and non-VC merging
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Label Distribution Protocol
(LDP)
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Downstream-on-demand mode
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Explicit Routing for Traffic
Engineering
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MPLS Support for Virtual
Networks
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MPLS allows service providers to
configure LSPs to create virtual
networks that support particular
classes of traffic flows.
MPLS can also be used to create
Virtual Private Networks (VPNs).
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Thanks for notice.
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