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5: Configuring Network Devices

5: Configuring Network Devices. Working at a Small-to-Medium Business or ISP. Objectives. ISR. What’s an ISR? One device that combines features LAN/WAN connectivity Security Wireless And more…. 1841 ISR. The IOS. Internetwork Operating System Describe what an OS does?

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5: Configuring Network Devices

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  1. 5: Configuring Network Devices Working at a Small-to-Medium Business or ISP

  2. Objectives

  3. ISR • What’s an ISR? • One device that combines features • LAN/WAN connectivity • Security • Wireless • And more…

  4. 1841 ISR

  5. The IOS • Internetwork Operating System • Describe what an OS does? • IOS is offered in images • Each image supports different features

  6. What’s In The Box? • Router • Power Cable • Serial Port Adapter • Blue Console Cable • Documentation

  7. Setting Up the Router

  8. Lab 5.1.2.4 • Connect to the Router • HyperTerminal Settings • 9600 baud • 8 data bits • No parity • 1 stop bit • No flow control

  9. Configuration • Out-of-band management • Initial configuration • Console or AUX direct connection • HyperTerminal • In-band management • Configuration changes over network/Internet • HTTP or Telnet from outside of network • One port must be active on router

  10. Configuration Programs-CLI • Command Line Interface • Looks similar to DOS commands • On ALL Cisco routers • In or out-of-band management

  11. Configuration Programs-SDM • Security Device Manager • GUI • In-band management ONLY • Configure additional LAN and WAN connections • Create firewalls • Configure VPN connections • Perform security tasks

  12. SDM Express • SDM Express • Initial router config

  13. Activity • CLI or SDM? • Web-based? • Text-based commands? • Command-prompt based? • Don’t need to know CLI commands? • Step-by-step config process?

  14. Startup-Config File • Saved file that starts up • Stored in NVRAM • Loads into RAM

  15. Running-Config File • Current config running • Stored in RAM • Goes away when shut down (unless saved) • If you make a config change, it MUST be saved • Copy running-config startup-config • Copy run start

  16. Packet Tracer Lab • 5.1.5.2 • Exploring the Running & Startup Configuration Files

  17. Review • Which port connects to your PC serial port & is used for initial configuration of a router? • Console • Which band management method is this? • Out-of-band • Your network MUST be working in order to connect & monitor/make changes to the config file. What 2 methods can be used? • HTTP/Telnet • SDM

  18. Review • Other than the console port, which other port can be used with a modem for initial configuration? • AUX • Which connection method is used for in-band management from a remote location? • Telnet • Which memory type keeps its contents when there is no power? • NVRAM

  19. Review • Where is the running-config stored? • RAM • Where is the startup-config stored? • NVRAM • Which mode is displayed when you log into the router? • User EXEC mode

  20. Config Using SDM Express • Like a wizard install • DOCUMENT! • Overview • Basic Configuration • LAN IP Address • DHCP • Internet (WAN) • Firewall • Security Settings • Summary

  21. SDM Express- Basic Config

  22. SDM Express- LAN IP Addresses

  23. SDM Express- DHCP

  24. Activity

  25. Configuring the WAN Connection • Serial connection to a WAN • Serial connection is slower than Ethernet • 100 Mbps- Ethernet • 1.544 Mbps- T1 • Both serial connections MUST be the same • Encapsulations (Layer 2 of OSI) • High-Level Data Link Control (HDLC) • Frame Relay • Point-to-Point Protocol (PPP)

  26. Getting the Serial IP Address • HDLC, Frame Relay, PPP • Static IP Address • Automatic IP Negotiated • Auto IP assignment through PPP encapsulation • Easy IP

  27. Lab 5.2.3 • Configuring the Router with SDM Express

  28. Review • Which 3 encapsulations can be on the serial interface using SDM Express? • HDLC • PPP • Frame Relay • On the 1st (basic) config screen of SDM Express, which can you configure? Host name Ethernet IP Address DHCP Enable Secret Password NAT DNS Domain Name Your Name

  29. Review • SDM & CLI. • Which is GUI? • SDM • Which is used for in & out-band management? • CLI • Which service translates names to IP addresses? • DNS • Which memory stays, even with no power? • NVRAM

  30. NAT using SDM & Lab 5.2.5 • Use Basic NAT (Dynamic) • Inside Locals share the WAN IP address (Inside Global) • Must tell it which address will share

  31. CLI Command Modes • User Mode • Limited commands like Ping & Traceroute • Type enable to enter privileged mode • Privileged Mode • Can alter router operation

  32. Interface & Other Modes • After privileged mode, you can configure • Type configure terminal OR config t • Once here, commands entered take effect immediately!

  33. E-Lab 5.3.1 • Step 3: int s0 • Step 5: router rip • Step 6: end • You can use Ctrl-Z in a real router, too • Step 9: line con 0

  34. Getting Help in CLI • Help or ?

  35. Oops… I goofed!

  36. Oops… I forgot! • Command History • Last 10 by default • Max 256 • Previous command • Ctrl-P or ↑ • Recent Command • Ctrl-N or ↓ • Tab • Completes command entry

  37. Activity & PT 5.3.2

  38. Show Commands & PT 5.3.3.3 • show running-config • show interfaces • show arp • show ip route • show users • show version

  39. Configuring w/ CLI & PT 5.3.4.4

  40. Configuring an Interface • Serial & Ethernet are common • Serial (WAN) • Your router is a DTE • CSU/DSU is the DCE • DCE provides a clocking rate

  41. Labs, Labs, & More Labs • E-Lab 5.3.5.3 • Packet Tracer 5.3.5.4 • Lab 5.3.5.5

  42. Configuring a Default Route • Router forwards packet to destination net • Looks at routing table to see which port to go out • Can set a default route to go out if not in routing table

  43. Labs…Yup! • Only one this time • Packet Tracer 5.3.6.2

  44. Configuring DHCP & PT 5.3.7.2 • Create DHCP Address Pool • Specify the Subnet • Exclude any IP Addresses • Specify the Domain Name- optional • DNS Server IP Address- 1 or 2 usually • Set the Default Gateway Address to be sent • Set the Lease Duration- default one day

  45. Configuring Static NAT • Inside server needs to be accessed from Internet • Must translate the private IP to the SAME public IP

  46. Configuring Static NAT • Packet Tracer 5.3.8.2 • Lab 5.3.8.3

  47. Backing Up the Config File • TFTP • Copy start tftp • To restore it: • Copy tftp run PT 5.3.9.2

  48. Switches- 2960 • OSI Layer? • TCP/IP Layer? • 3-Layer Model Layer? • Uses the destination ____ to forward frames. • Use CLI or Cisco Network Assistant (GUI)

  49. LEDs • SYST • Working or not • Green or Amber • RPS • Redundant power supply • STAT (Port Status) • Green- Link • Blinking Green- Tx/Rx • Amber- error

  50. Speed of Ports • 10/100/1000 • Half-Duplex • Full-Duplex • Port & device MUST be set same • Auto-negotiate (by default on Cisco) • MUST be on both devices or else collisions

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