Enterprise Networking

Brandon Wagner

BYU OIT Network Engineer

Who Am I? IT Major – Graduate in August 2010

Worked for BYU OIT for 4 ½ years (2 part-time, 2 ½ full-time)

Primary Responsibilities Cisco NAC Packetshaping Packet Analysis Data Center Design New Construction Design

Secondary Responsibilities Firewalls Routing/Switching QoS Network Security

Lecture Outline

How do you build a scalable, efficient, and service oriented campus/enterprise network?

What specific technologies are implemented at each layer of the campus/enterprise network (specifically BYU)?

Network Design

Things to Consider:

Security

Bandwidth

Cost

Resilience

Services

What do you need?

How much of it do you need?

Does your planning meet the need?

The Setup

Switch (Layer 2) MAC Address to Port Number

(MAC/CAM Table)

Router/Switch (Layer 2.5) Maps MAC Address to IP

Address (ARP Table)

Router function (Layer 3) IP Routes (Routing Table)

Enterprise Network Architecture

Edge/Access Main Function

Connect end user devices to the network. Only place in network that is NOT redundant.

Services IP Phones Access Points End User Connections DHCP Snooping VLANs Port Security (MAC Address limiting)

Equipment Layer 2 switches with managed service that run in “hardware”

Edge/Access Layer Cont’d

Cost: $26,000

DHCP Snooping

JKB Access Closet

Distribution Main Function

Bridge Core and Edge devices (Layer 2.5) Provide redundancy to minimize failure recovery time

Services Firewalls QoS Policing Route between edge VLANs ACL’s Anti-spoof Route Summarization

Equipment: Layer 2/3 Switches

Distribution Cont’d

Cost: $76,000

TNRB Distribution Closet

EIGRP Routing

Core – High Speed Switching Main Function

Connect distribution points All Layer 3 High availability, adapts quickly to change, no packet manipulation.

Services: IGP (EIGRP, IGRP) IS-IS OSPF

Equipment Very Fast Layer 3 Switching (360Gb/sec to 15Tbps/sec) in

“hardware” BYU: 496,000 packets/sec average, 960,000 packets/sec peak in

Core

Core – Cont’d

Cost: $150,000

BYU Campus Architecture

Other Implementations

Data Center Design Router Core Row End Top of Rack

Service Provider Router Core Metro Area Customer

Edge

Enterprise Edge Provider Edge Campus Campus

Core

Case Study: XO Communications

Enterprise Edge

Distribution EdgeCore

Pro’s and Con’s to the Enterprise Model Pro’s

Resilient to problems, change Easier to Manage

Con’s Expensive More time in the planning phase

Others?

Layer 1 - Cabling Fiber

Single Mode Multi Mode SC connector LC connector

Copper Cat5E Cat6

Questions?