1 / 12

Routing

Routing. Routing Basics Distance Vector Routing Link-State Routing Comparisons of Routing Protocols. Network Layer. Addressing, Routing, & Switching Best effort delivery of packets Routed Protocols Routing Protocols maintain routing tables path selection limit broadcasts.

sonia-mosley
Download Presentation

Routing

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. Routing • Routing Basics • Distance Vector Routing • Link-State Routing • Comparisons of Routing Protocols

  2. Network Layer • Addressing, Routing, & Switching • Best effort delivery of packets • Routed Protocols • Routing Protocols • maintain routing tables • path selection • limit broadcasts

  3. Static Routes • Determined by admin • Reveals only information that you want to show about your network • Less overhead on network • Good for stub networks that only have one connection • What happens if route fails??

  4. Dynamic Routes • Routing protocol makes automatic adjustments on routes based on traffic, topology and other metrics • Reveals information about your network - security? • Less involvement by admin • Depend on timely updates of configuration to routing tables

  5. Default Route • A routing table entry that sends data to next hop when that entry is not specified in the routing table • Can be used to reach any unknown destination

  6. Bandwidth delay load reliability hop count ticks cost Metrics used by routers

  7. Routing Protocols • Distance Vector • Link State • Convergence

  8. Distance Vector • Each router gets routing tables from its neighbors • Routers determine best path based on info from their neighbors – accumulated distance – hops • Convergence – time for tables to update after change in topology

  9. Errors in Routing • Routing Loops • Count to infinity • Solution • Define a maximum – 15 hops • Split Horizon • Hold Down timers – inaccessible routes marked with timers

  10. Link State Routing • Shortest Path First • Full knowledge of distant routers • LSAs • Topology Database • SPF Algorithm • Routing tables • Designated Routers

  11. Two Link State Concerns • CPU Usage & RAM • Bandwidth • Also - Unsynchronized LSAs lead to inconsistent path decisions amongst routers

  12. Different Routing Protocols • Distance Vector vs. Link-State • Hybrids • EIGRP and IS-IS • DV metrics, LS topology change • LAN-LAN & LAN-WAN

More Related