1 / 9

Packet Switch Architectures

Packet Switch Architectures. Packet Switches. Different types of packet switches: IP routers ATM switches MPLS switches Ethernet (LAN) switches Frame Relay All types of packet switches have very similar characteristics. Hardware components of a router: Network interfaces

vperry
Télécharger la présentation

Packet Switch Architectures

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Packet Switch Architectures ECE 1545

  2. Packet Switches • Different types of packet switches: • IP routers • ATM switches • MPLS switches • Ethernet (LAN) switches • Frame Relay • All types of packet switches have very similar characteristics ECE 1545

  3. Hardware components of a router: Network interfaces Interconnection network Processor with a memory and CPU Switch Components ECE 1545

  4. Basic Architectural ComponentsPer-packet processing Output Scheduling Routing Table Switch Fabric Routing Decision Routing Table Forwarding Decision Routing Table Forwarding Decision

  5. Functional Components Control Datapath: per-packet processing ECE 1545

  6. Routing and Forwarding Routing functions include: • route calculation • maintenance of the routing table • execution of routing protocols Forwarding is per-packet processing • On high-end packet switches routers, forwarding is highly parallelized, and most work is done on the interface cards ECE 1545

  7. IP Router • Lookup packet destination address in forwarding table. • If known, forward to correct port. • If unknown, drop packet. • Decrement TTL, update header checksum. • Forward packet to outgoing interface. • Transmit packet onto link. ECE 1545

  8. Virtual Circuit Switch • Look up VCI/VPI of cell in VC table. • Replace old VCI/VPI with new. • Forward cell to outgoing interface. • Transmit cell onto link. ECE 1545

  9. Ethernet Switch • Lookup frame destination address in forwarding table. • If known, forward to correct port. • If unknown, broadcast to all ports. • Learn source address of incoming frame. • Forward frame to outgoing interface. • Transmit frame onto link. ECE 1545

More Related