OSPF Exercise

 

Working groups (WG) will be the following:

WG1- Row 1&2

WG2 – Row 3&4

WG3 – Row 5&6

WG4 – Row 7&8

Each Working group will have four routers and they will use an IP C Class:

WG1 – 10.0.1.0

WG2 – 10.0.2.0

WG3 – 10.0.3.0

WG4 – 10.0.4.0

Part 1 – each working group is working separately

Connect the routers and networks as shown on the Working group interconnection map.

  1. Make the addressing plan saving the address space.
  2. Draw a table with the link state database. Draw the routing table for one of the routers.
  3. Make the connections according to the picture.
  4. Configuring OSPF on all router interfaces, using only area 0.
  5. Check if the connectivity is established.
  6. Remove the link between the router R3 and the router R4 and see if an alternative route has been found. Measure the time needed for that.

 

Part 2 – working groups are collaborating
  1. Connect router R1 as it is shown on the interconnection map for part 2. The interfaces offering interconnection between WGs will be part of Area 0. The rest of the routers will be members of the areas defined by the number of the working group. Define the new Network IP Class for Area 0 and decide how many areas you will have and which routers will belong to which area.

How many different link state databases will be obtained? Draw the table for these databases

 

 

 

 

 

OSPF Configuration Commands (List of some of them)

Enable OSPF routing, which places you in router configuration mode

router ospf <process-id>

Define an interface on which OSPF runs and define the area ID for that interface

network <address> <mask> area <area-id>

Explicitly specify the cost of sending a packet on an OSPF interface

ip ospf cost <cost>

Specify the number of seconds between link state advertisement retransmissions for adjacencies belonging to an OSPF interface.

ip ospf retransmit-interval <seconds>

Set the estimated number of seconds it takes to transmit a link state update packet on an OSPF interface.

ip ospf transmit-delay <seconds>

Set priority to help determine the OSPF designated router for a network

ip ospf priority <number>

Specify the length of time, in seconds, between the hello packets that the Cisco IOS software sends on an OSPF interface

ip ospf hello-interval <seconds>

Assign a specific password to be used by neighboring OSPF routers on a network segment that is using OSPF’s simple password authentication.

ip ospf authentication-key <key>

Configure the OSPF network typoe for a specified interface

ip ospf network {broadcast|non-broadcast|point=to-multipoint}

Configure routers or access servers interconnecting to nonbroadcast networks

neighbour IP-address [priority <number>] [poll-interval <seconds>]

The complete guide of configuring OSPF on Cisco’s routers is given in:

http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121cgcr/ip_c/ipcprt2/1cdospf.htm

The complete list of OSPF commands reference is presented at:

http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121cgcr/ip_r/iprprt2/1rdospf.htm

 

 

Working Group Nr X (WGX) Interconnection Map

(Part 1)

 

 

 

 

 

 

 

 

 

 

 

Interconnection Map

(Part 2)