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Copyright © 1997 Cisco Systems, Inc.
6-31CSE: Networking Fundamentals — WAN Basics
© 1999, Cisco Systems, Inc.
www.cisco.com
Administrative Distance
Administrative Distance
–Administrative distance is a selection
method for IP routing protocols
–The lower the administrative distance, the
more trusted the learning mechanism
•Manually entered routes are preferred to
dynamically learned routes
•Routing protocols with sophisticated
metrics are preferred over protocols with
simple metric structures
6-32CSE: Networking Fundamentals — WAN Basics
© 1999, Cisco Systems, Inc.
www.cisco.com
Administrative Distance
Comparison Chart
Administrative Distance
Comparison Chart
Connected interface 0
Static route out an interface 0
Static route to a next hop 1
EIGRP summary route 5
External BGP 20
Internal EIGRP 90
IGRP 100
OSPF 110
IS-IS 115
RIP v1, v2 120
EGP 140
External EIGRP 170
Internal BGP 200
Unknown 255
Connected interface 0
Static route out an interface 0
Static route to a next hop 1
EIGRP summary route 5
External BGP 20
Internal EIGRP 90
IGRP 100
OSPF 110
IS-IS 115
RIP v1, v2 120
EGP 140
External EIGRP 170
Internal BGP 200
Unknown 255
Route Source
Route SourceRoute Source
Default Distance
Default DistanceDefault Distance
- Introduction 1
- WAN Devices 2
- WAN Terminating Equipment 2
- Circuit Switching 3
- Packet Switching 3
- WAN Virtual Circuits 4
- WAN Protocols 4
- Transmission 5
- Transmission Options or WAN 6
- Services 6
- POTS Using Modem Dialup 6
- Integrated Services Digital 7
- Network (ISDN) 7
- Leased Line 8
- Frame Relay 8
- Asynchronous Transfer Mode 9
- Wide-Area Network 10
- Requirements 10
- Manage Bandwidth to 11
- Control Cost 11
- Dial-on-Demand Routing 11
- Compression 12
- Dial Backup 13
- Fundamentals 14
- Routing 14
- Routing Requirements 15
- Routing Information 15
- © 1999, Cisco Systems, Inc 16
- Routing Decisions 17
- RIP Routing Metrics 17
- IGRP Routing Metrics 18
- Routers Forward Traffic 18
- EIGRP Convergence 20
- OSPF Convergence 20
- IP Addressing 21
- Issues with IP Addressing 22
- IP Addressing Solutions 22
- Subnetting Overview 23
- IP Address Classes 23
- Virginia? 24
- What Is Route 25
- Summarization? 25
- Cisco Router 26
- Architecture 26
- Routers (Operationally) 27
- Cisco Family of 27
- Cisco 800 Series 28
- Cisco 1000 Series 28
- Cisco 1600 Series 29
- Cisco 1700 Series 29
- Cisco 2500 Series 30
- Cisco 2600 Series 31
- Cisco 2600 Modules 32
- Cisco 3600 Series 32
- Cisco 3600 Modules 33
- AS5x00 Series 33
- Cisco 4000 Series 34
- Cisco 4500/4700 Modules 34
- Cisco 3600 and 4000 35
- Positioning 35
- Cisco Core Router Platforms 35
- Cisco 7500 Series 36
- VIPs and Port Adapters 37
- VIP2 Models 37
- Cisco 7200 and 7500 Network 38
- Interfaces 38
- Scalable Feature 38
- Performance 38
- Cisco 12000 Series GSR 39
- Enterprise WAN Family 39
- Cisco IOS 40
- IP Network Services 40
- Example: Audio Streaming 41
- Infrastructure 43
- Applications 43
- Traffic Is Grouped into SLAs 45
- Step 1: Identify Traffic and 46
- IP Packet 47
- When there is 48
- Benefits: 50
- Cisco’s Complete Network 52
- Security Solutions 52
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