1. Network Overview

2. Contents Jones network basics and topology
Current network technologies
LAN and Ethernet
Circuit based WAN – ATM and Frame Relay
The future – GBN, GTS, etc.

3. Jones Network History 'The Flat' – LAN, layer 2 based network
Layer 2 – Ethernet level switching
Limited expandability
Single-vendor: Cabletron
Also provided management solution, Cabletron Spectrum

4. LAN/Layer 2 Local Area Networks “Layer 2” of the seven-layer OSI model
Computer-to-computer, hardware level
Hubs and switches
Collision and broadcast domains
Controlled by the Spanning Tree Protocol
Reconvergence problems
Broadcast storms

5. Jones Campus Network Today
Hierarchical
Core, Distribution and Access routers
Core routers connect all areas
Distribution router pairs handle communication and routing
Access routers handle port-intensive end-device interfacing
Layer 3 based
IP Routing
Segregates areas, IP routing protocols provide fault tolerance, in combination with hardware redundancy
SVAS
WADS
SVDS
SCDS
Core
CLDS
BUDS
BRDS
CLAS

6. Layer 3/IP ISO Model, layer 3 Network layer Routing protocols
Protocols: IP, IPX, XNS, etc.
Higher level addressing and routing functions
Provides isolation and routing between LANs
IP: Hierarchical addressing, a.b.c.d style
Subnetting and Subnet Masks
Today: Layer 3=IP
Routing protocols
BGP, IGRP
Provide similar function to STP on the IP level
Similar problems, but less widespread

7. Jones Campus Details Distribution routers in pairs
Connect to access switches
Closet Distribution
Connects to pairs of Closet Access switches
Where (most) desktops connect
Server Distribution
Wide-Area Distribution
And WAN ATM
Branch Distribution
Backup Distribution
SOC Distribution
An ‘Island’ for the SOC, with SCAS swtich

8. Jones WAN Technologies
Fiber-optic connections to all areas
Fiber ring connects all three St. Louis campuses
Fiber links to Tempe (now Gigabit Ethernet), UK, Canada
Direct from ATM area to cores
Used as an access path for other circuits
Breaks out into individual links
Serial links pass through matrix switches, DSU
May go to SNA/Mainframe network directly or to IP WAN
IBM 3745, SNA links
IP WAN Tier 1: Standard vendor links
Tier 2: Jones terminals at remote sites
Tier 3: Trusted networks, Boone, Frame-Relay WAH

9. Circuit-based WAN Protocols
PVC concept
Permanent Virtual Circuit
Divide one connection into many concurrent ones
ATM
Frame Relay

10. ATM Asyncronous Transfer Mode
The “Network of the Future” - in the ‘90’s
Typically used for high-capacity WAN circuits
Small packets (cells) of 64 bytes each
Provides Quality of Service
Time-sensitive data/PVC gets priority
Voice, video and data can be carried together
Out of style for many duties
Ethernet now provides speed and QoS

11. Frame-Relay ATM’s lower-tech counterpart
Used as a sort of layer 2 Internet
Each end of a PVC gets an identifying number
DLCI - Data Link Connection Identifier
Links have two bandwidth numbers
CIR - Committed Information Rate
Full link rate
Commonly used for low-bandwidth connections
Point-to-multipoint
HQ to branch-style connections
To be replaced (maybe) by MPLS
Used for vendor, WAH, UK Branch connections

12. GBN Network Design Large point-to-multipoint network Evolving Design
MPLS to varied branch access circuits
ADSL, SDSL, T1…
Any technology that can be attached to the MPLS cloud
Provides one link and redundency at lower cost than Frame
Head-end routers
St. Louis and Tempe
Using DS3 (45mbit serial) for now
Branch components
Router, local switch, and UPS monitored at this time
Final configuration to be determined.

13. GBN Logical Network Uses MPLS VPN Technology
MPLS - Multiprotocol Label Switching
“Layer 2.5” add-on tunneling protocol
Can be encapsulated and deencapsulated (pushed and popped) multiple times for security or design flexibility
Is designed to be more flexible than Frame-Relay with larger packet sizes and less total overhead than ATM
VPN (Virtual Private Network)
Typically refers to encrypted encapsulation
Carries IP traffic (IPSec VPN) or can be used with MPLS
Provides secure traffic transmission
Allows for use of a cheaper, provider-run ‘insecure’ network