Configuring the Router Component

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Configuring the Router Component

• Chaminade University
• Department of Computer Science
• Prof. Martins

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Router Configuration

• Cisco AGS
• Two Ethernet Ports
• Two Serial Ports
• WAN
• Console

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Types of Commands

• Global Commands apply to the router as a whole
  (e.g. hostname)
• Interface Commands Apply to the configuration
  of interface (e.g. Ethernet Interface)
• Line Commands Apply to the configuration of
  serial ports
• Router Commands apply to different routing
  protocols (e.g. RIP, OSPF)

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Levels of User Access

• Hostname gt provide access to a restricted set of
  commands no password required
• Hostname provide access to all router commands
  require password

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Protocols to be configured

• IP Internet Protocols
• RIP Routing Information Protocol
• OSPF Open shortest Path First
• BGP Border Gateway Protocol

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Global Commands

• Host Name router 1
• Enable password martins
• Enter virtual terminal password martins
• Configure SNMP Network Management no
• Configure IP? yes
• Configure IGRP routing? no
• Configure RIP routing? yes
• Configure DECnet? no
• Configure Novell? no
• Configure Apollo? no
• Configure AppleTalk? no

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Interface Commands

• Interface Ethernet 0 is the router interface on
  subnet 0.
• IP address 192.192.192.234
• bits in subnet field 5
• Class C network 192.192.192.0
• Mask 255.255.255.248

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Interface Commands

• Interface Ethernet 1 is the router interface on
  subnet 2.
• IP address 192.192.192.243
• bits in subnet field 5
• Class C network 192.192.192.0
• Mask 255.255.255.248

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Interface Serial 0

• Not being used.

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Interface Serial 1

• This is the console interface
• Can be configured from the router main menu

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Write Memory

• Global configuration can be saved in non-volatile
  RAM
• Hostname write memory
• Hostname write erase

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Command-Line Configuration

• Allow specification of more configuration details
• Open Hyperterminal connection to the console port
  on the router
• Press Enter and get the prompt router 1gt
• Press Enter and get the password prompt
• Get prompt router 1

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Erasing Non-Volatile RAM

• It is necessary so that we can start
  configuration with a clean state
• Type Write Erase at the router 1 prompt
• Then type configure

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Global Configuration Commands

• IP Domain Name raleigh
• IP Name Server 192.192.192.242

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Interface Ethernet 0

• IP address 192.192.192.234
• Mask 255.255.255.248
• Encapsulation arpa
• Arp timeout 1800

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Encapsulation ARPA

• Specifies that the router is going to use
  Ethernet II frames
• The other choice would be ISO1.
• ISO1 specifies the use of IEEE 802.3 frames.

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ARP timeout 1800

• Specifies that the ARP protocol will retain
  Ethernet-IP mappings for 1800 seconds (30 min).
• The default value is 4 minutes.

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Ethernet Interface 1

• Similar to Ethernet Interface 0

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Configuring Routing Protocols

• There are two protocols to consider
• Routing Information Protocol (RIP)
• Open Shortest Path First Protocol (OSPF)

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Configuring RIP

• Use command router rip
• Subcommand network specifies the attached
  networks to which RIP will send the routing table
• There are no other routers in this network
• We specify the address of our class C network.

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Configuring OSPF

• Use command router ospf 1

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Interior Routing Protocols
IRP
OSPF
RIP
OSPF is more efficient than the RIP OSPF sends
the routing tables whenever changes occur. RIP
sends the routing table every 30 seconds.
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Some definitions .

• Autonomous Systems (AS)
• A system under one administration
• Networks use the same routing protocols
• Have one or more areas connected
• Areas are connected by Area Border Routers (ABR)
• Area border routers use the Border Gateway
  Protocol (BGP)

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Some definitions

• A router can be classified as
• Area border router connect two or more areas
  inside the AS
• Area boundary router connect to a router in
  another AS

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Autonomous System (AS)
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Router ospf 1
Subcommand Network

• Network 192.192.192.232 0.0.0.1 area
  192.192.192.232
• area 192.192.192.232 is an area of a AS we are
  making subnet 1 this area
• Network 192.192.192.232 This router will
  advertise to other routers that it has access to
  addresses in the range 192.192.192.233 to
  192.192.192.239

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WildCard Mask

• 0.0.0.1 is a wildcard
• Similar to an IP maks
• Meaning The last digit in the last field of the
  IP address can be anything in the allowed device
  addresses.
• The other decimal digits are fixed.

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Subcommand Network
Router OSPF 1

• Network 0 255.255.255.255 Area 0

Area 0 Router
Area
Area
Backbone Area
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Backbone Area

• A Backbone area
• Must be specified for any Autonomous System
• Is the network that provides the inter-area
  connectivity
• The router being configured is in the backbone
  area.

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Backbone Area (Figure)
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Backbone Area

• The backbone area contain border routers that
  connect areas to the backbone
• The router being configured is an Area border
  router.

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WildCard Parameter

• 255.255.255.255
• Means that the router will advertise all devices
  in the backbone area
• There is only one device in the backbone area
  the router.
• Therefore, there is nothing to be advertised.

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Subcommand Network

• Network 192.192.192.240 0.0.0.1 Area
  192.192.192.240
• Area 192.192.192.240 This is an area of the
  Autonomous system it corresponds to subnet 2
• Network 192.192.192.240 0.0.0.1 The router will
  advertise that it has access to addresses in the
  range 192.192.192.241 to 192.192.192.192.249 to
  all other routers

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Router BGP1

• Starts the BGP routing process
• 1 is used to identify this router to BGP routers
  on other AS and tag information sent.

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Subcommand Network

• Network 192.192.192.0 advertises that network
  192.192.192.0 is in Autonomous System 1

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Serial Interface

• Connect to a Modem
• Command Interface serial 0
• See page 141 for more details

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