1 / 16

Frame Relay Congestion Control

Frame Relay Congestion Control. ENTC 345 Dr. Ana Goulart Assistant Professor. Announcements. Reading: Stallings Chapter 10 and 13 Lab #2 tomorrow (please take the Lab Manual) TA: Aninda@neo.tamu.edu Office hours: Mondays 5 to 8 pm (T 101) Hw # 2 due Friday. Review.

marlow
Download Presentation

Frame Relay Congestion Control

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. Frame Relay Congestion Control ENTC 345 Dr. Ana Goulart Assistant Professor

  2. Announcements • Reading: Stallings • Chapter 10 and 13 • Lab #2 tomorrow (please take the Lab Manual) • TA: Aninda@neo.tamu.edu • Office hours: Mondays 5 to 8 pm (T 101) • Hw # 2 due Friday

  3. Review • Problem on Packet Switching – we’ve underestimated the delays for PS

  4. Review • Problem on Packet Switching • Frame Relay • What is a DLCI? • Difference between X.25 and FR protocols? • Call control signaling: in-band or out-of-band? • Congestion control mechanisms

  5. Frame Relay Definition: a connection-oriented public packet-switched service offered by the phone company (defines only layer 2) Packet switching Network Virtual circuits (called Data Link Connections) Connection-oriented network

  6. Frame Relay Connection-oriented: a connection between the communicating parties is set up before the actual data transmission Two types of virtual circuits: - Permanent Virtual Circuit (PVC): permanent established VC for frequent data transfer between end points (no call setup) - Switched Virtual Circuit (SVC) : a new VC for every connection

  7. Protocol Architecture – Layer 2

  8. User Plane – LAPF frames Packet format 1 Flag Variable length Data 2 checksum 1 Flag 2 – 4 octets Address + Control Congestion notification Discard Eligibility

  9. Congestion Control

  10. FR Congestion Control • CIR – Committed Information Rate

  11. FR Congestion Control • Access Rate = physical data rate across the user-network interface ΣCIRi,j ≤ Access Rate j i Contract Parameters: • Committed Information Rate (CIR) • Committed Burst Size (Bc) • Excess Burst Size (Be)

  12. FR Congestion Control

  13. FR Congestion Control

  14. Opnet Models for Frame Relay • FR-enabled clients and servers for direct access to FR network • FR-capable routers with at least one interface supporting FR • FR switches for constructing the core of the FR network

  15. Opnet Models for Frame Relay (cont.) • FR clouds, providing an abstract way to specify the FR network core • FR-PVC-Config Object, to facilitate PVC configuration

  16. Opnet Models for Frame Relay FRAD = Frame Relay Access Device

More Related