Version 4.1. Configuring Network Devices
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1 Version 4.1 Configuring Network Devices
2 Objectives Configure a router with an initial configuration. Use Cisco SDM to configure a Cisco ISR with LAN connectivity, Internet connectivity and NAT. Configure a Cisco router for LAN connectivity, Internet connectivity and NAT using the Cisco IOS CLI. Configure a WAN connection from customer premises to an ISP. Describe, setup and configure a standalone LAN switch.
3 Initial ISR Router Configuration ISR (Integrated Services Router combines routing, LAN switching, security, voice, & WAN connectivity features. Ideal for small to medium-sized businesses & ISP managed customers.
4 Initial ISR Router Configuration Cisco IOS offered in modules called images IP Base image: entry-level Cisco IOS Images are specific to models of devices
5 Cisco 1841 Modular router Table 1 Memory Requirements for Cisco 1841 Modular Router Flash RAM Platform Feature Set Image Memory 1 Memory Cisco 1841 IP Base c1841-ipbase-mz 64 MB 128 MB IP Voice c1841-ipvoice-mz 64 MB 192 MB Enterprise Base c1841-entbase-mz 32 MB 128 MB Advanced Security c1841-advsecurityk9- mz 64 MB 192 MB SP Services c1841-spservicesk9-mz 64 MB 192 MB Enterprise Services Advanced IP Services Advanced Enterprise Services c1841-entservicesk9- mz c1841-advipservicesk9- mz c1841-adventerprisek9- mz 64 MB 192 MB 64 MB 192 MB 64 MB 192 MB
6 CISCO IOS Image: Types of Images Two main types of image your router may use: 1. System image - complete Cisco IOS software. This image is loaded when your router boots and is used most of the time. On most platforms, the image is located in Flash memory. 2. Boot image - A subset of the Cisco IOS software. This image is used to perform network booting or to load Cisco IOS images onto the router. This image is also used if the router cannot find a valid system image. Depending on your platform, this image may be called xboot image, rxboot image, bootstrap image, or boot loader/helper image. On some platforms, the boot image is contained in ROM. In others, the boot image can be stored in Flash memory. On these platforms, you can specify which image should be used as the boot image using the boot bootldr global configuration command. Refer to your hardware documentation for information about the boot image used on your router.
7 Image Naming Convention You can identify the platform, features and image location by the image name. Naming convention is: platform features type Example: c2600-js-l_121-3.bin c hardware platform js - features set (enterprise) l - file format (relocatable, not compressed) version & release # (version 12.1 release 3)
8 Image Naming Convention - continued Platform variable platform that can use image For example c1700, c2600, c7000 Features feature sets supported by image. Type can contain following characters f The image runs from Flash memory. m The image runs from RAM. r The image runs from ROM. l The image is relocatable. z The image is zip compressed. x The image is mzip compressed.
9 Initial ISR Router Configuration Tools and equipment required for setup:
10 Initial ISR Router Configuration Three-stage bootup process: Power-on self test (POST) Locate and load Cisco IOS Locate startup configuration file or enter setup mode
11 Bootup Process - contd POST (Power On Self Test) test hardware After POST, the bootstrap program is loaded Bootstrap locates IOS and loads it into RAM IOS can be located flash memory, TFTP server, or another location By default, IOS loads from flash After IOS is loaded, bootstrap locates startup configuration file in NVRAM (non-volatile random access memory) Startup configuration when loaded into RAM (working memory), it become the running configuration.
12 Loading Cisco IOS Get default IOS from FLASH Flash empty Get IOS from TFTP Server TFTP Server empty Get limited Cisco IOS from ROM
13 Show version command output Router>show version IOS version Bootstrap program stored in ROM Complete filename of IOS Type of CPU; amount of RAM Number & type of interfaces Amount of NVRAM (used to store startup config) Amount of Flash (used to store IOS Configuration register in hex
14 Configuration register Default setting 0x2102 (remember this?) Loads IOS from flash Loads startup-config from NVRAM Most common settings 0x2142 ignores contents of NVRAM/configuration 0x2120 The router into ROMmon mode 3/products_tech_note09186a f.shtml **Go to Configuration Register Values & Their Meaning.
15 Initial ISR Router Configuration Verifying and troubleshooting bootup process: View output from the show version command Use dir flash: and boot flash: in ROMmon mode View boot system commands [see miage below on next slide]
16 Initial ISR Router Configuration (continued)
17 Initial ISR Router Configuration (continued) Out-of-band management for initial configuration In-band management over a network connection In-Band Out-of-Band Terminal emulation HTTP or Telnet
18 Initial ISR Router Configuration (continued) Command Line Interface (CLI): textbased program Can be used in both in-band or out-ofband Extensive help system on next slide] [see image below
19 Initial ISR Router Configuration (continued)
20 SDM Security Device Manager (SDM): web-based GUI In-Band only SDM Express (Basic) or Full package (Advanced configuration) Comes preinstalled in flash
21 CLI vs. SDM CLI SDM User Interface Term Emulation software Web-based browser Telnet Configuration Method Text-based Cisco commands GUI buttons & text boxes Expertise in Cisco Device Config. Depends on the config task Do not need knowledge of CLI commands Help Features Command-prompt based GUI based online help & tutorials Flash Requirements Covered by IOS requirements 6MB of free memory Availability ALL Cisco devices Cisco 830 series thru Cisco 7301 What It s Used When device does not support SDM Initial config of SDM equipped device
22 Using Cisco SDM Express and SDM Follow best practices for installing a new device to ensure correct functions
23 Using Cisco SDM Express and SDM Eight SDM Express configuration screens: Overview Basic configuration LAN IP address DHCP Internet (WAN) Firewall Security settings Summary
24 Using Cisco SDM Express and SDM Use Basic NAT Wizard to configure dynamic NAT with PAT
25 Configuring a Router Using IOS CLI CLI command modes: two levels of access
26 Configuring a Router Using IOS CLI Configuration modes can alter the operation of the device
27 Configuring a Router Using IOS CLI Help features: Command completion Error indicators Command history Enabled by default Records 10 command Max 256 commands history size command Arrow and function keys
28 Configuring a Router Using IOS Show commands display configuration and operation information R#show run R#show interfaces R#show ip route R#show protocols CLI
29 Configuring a Router Using IOS CLI Use Cisco IOS CLI to perform an initial router configuration
30 Configuring a Router Using IOS CLI Configure serial and Ethernet interfaces on a router (DTE) Data Terminal Equipment endpoint of user s device on the WAN link; Cisco routers (DCE) Data Communications Equipment; provides clock rate; modem; converts data from router to acceptable format to cross the WAN If back-to-back router scenario, one of the routers will be DCE and one DTE.
31 Configuring a Router Using IOS CLI Configure a default route for the Cisco router Default route used when router does not know where to send a packet. IP address of next-hop router Or port number
32 Configuring a Router Using IOS CLI Configure a Cisco router to function as a DHCP server
33 Configuring a Router Using IOS CLI Configure static NAT on a Cisco router to enable Internet access for an internal server
34 Configuring a Router Using IOS CLI Back up and restore configuration files using a TFTP server
35 Configuring a Router Using IOS CLI Capture and save configuration file output from a terminal session
36 Connecting the CPE to the ISP Customer Premise Equipment (CPE) network devices installed at customer location. Configuration checklists ensure that all configuration requirements are met
37 Connecting the CPE to the ISP Use inventory and configuration checklists and an installation plan to ensure successful installation
38 Connecting the CPE to the ISP Documentation includes diagrams, checklists, and activity logs
39 Connecting the CPE to the ISP Types of customer connections over a WAN: Point-to-point: often called leased lines; typically most expensive; price based on bandwidth & distance between 2 points Circuit-switched similar to a phone call made over a phone network; example is ISDN or dialup connection; physical circuit reserved from source to destination Packet-switched each customer has a virtual circuit; example is Frame Relay
40 Customer Connections over WAN Bandwidth and cost influence WAN choices
41 Connecting the CPE to the ISP Clock rate and serial encapsulation are needed when configuring serial WAN connections Clock rate is set by DCE DTE accepts clock rate Leased WAN connections use serial connection & require Channel Service Unit/Data Service Unit (CSU/DSU DCE DTE
42 Initial Cisco 2960 Switch Configuration Fixed-configuration, standalone devices does not use modules or flash card slots. Physical configuration can t be changed. Layer 2 device that directs stream of message coming in from one port, our of another based on destination MAC address. Configured using GUI or CLI
43 Cisco 2960 switch Comes preconfigured Needs to be assigned basic security info Basic commands (ex: hostname, passwords) sames as ISR switch. Configure management IP address One virtual local area network, VLAN 1 is preconfigured to provide access to management functions.
44 Initial Cisco 2960 Switch Configuration Switch settings can be configured using the Cisco IOS CLI Assign an IP address to the default management virtual local area network, VLAN1
45 Initial Cisco 2960 Switch Configuration Check switch components Connect cables to the switch Power up the switch and observe POST
46 Initial Cisco 2960 Switch Configuration Connect the stand-alone LAN switch to the router and verify connectivity Configure port security to prevent unauthorized use Shut down unused ports
47 Switch port security Port security limits the # of MAC addresses allowed per port. Set port to access mode using switchport mode access command 3 ways to configure port security: Static MAC addresses are manually assigned using switchport port-security mac-address [mac-address] interface config command. S1# configure terminal S1(config-if)#interface fastethernet 0/20 S1(config-if)#switchport mode access S1(config-if)#switchport port-security mac-address S1(config-if)#end
48 Switch port - contd Dynamic MAC addresses are dynamically learned & stored in address table # of addresses stored can be controlled; default is one address. If port is shut down or switch is restarted, address learned are cleared from the table S1# configure terminal S1(config-if)#interface fastethernet 0/20 S1(config-if)#switchport mode access S1(config-if)#switchport port-security S1(config-if)#end
49 Switch port - contd Sticky similar to dynamic Addresses learned are saved to the running-config S1# configure terminal S1(config-if)#interface fastethernet 0/20 S1(config-if)#switchport mode access S1(config-if)#switchport port-security S1(config-if)#switchport port-security maximum 50 S1(config-if)#switchport port-security mac-address sticky S1(config-if)#end
50 Initial Cisco 2960 Switch Configuration Cisco Discovery Protocol (CDP) gathers information about directly-connected Cisco network devices Two Cisco devices directly connected on the same local network are called neighbors
51 Summary The Integrated Services Router (ISR) is a good choice for small to medium businesses and ISP-managed customers. ISRs can be initially configured using SDM or the router IOS CLI. When using the CLI, show commands verify configuration elements. An installation plan can minimize disruption to a network when new devices are being added.
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