Campus OSPF configuration

[swilk]

Greetings .... I manage a small/medium sized campus network consisting of 4 Cisco 6500 series chassis (each with SUP720's) and a couple hundred Cisco 3550/3560/2960 edge switches. We recently completed a new leg of fiber that will make a completed loop between all of the 6500's .... before I make the pyhsical connection I need to figure out my OSPF entries on each 6500 switch.

I have done some research and am still a bit fuzzy on exactly what I should do.

Looks like I will enable the ospf on each SUP720 (router ospf) and then I can configure each interface to be used in the loop??

I should end up with 2 interfaces per 6500 running in the loop .....

Am I on the right track? A sample list of commands would be helpful if someone can point me in the right direction.

[Alessio Andreoli]

Hi Swilk,

no loop will be in place. Run OSPF in all of them and enable all the 6500 interfaces to understand OSPF area 0 and then you will be able to check and modify the topology whenever you want without massive impact. before anything , of course, design your solution and your needs/requirements.

Alessio

PS: keep in mind that all the areas you have defined in your domain should be able to run across this 4x6500 core....

[swilk]

"no loop will be in place"...... but there will be a ring? Correct?

Under normal circumstances the data will travel whichever leg has the shortest time to destination. In the event of a fiber break the traffic will automatically go to the remaining path.

when I go into "config t" and enter "router ospf ?" it comes up with "Process ID". Does it matter which value I enter there? Will the process ID be the same for each sup engine?

[swilk]

After some more reading ....

Do I assugn each interface an IP address .... then add that IP address to the "router ospf" command?

Something like this?

interface gig 1/1

ip address 192.168.1.1 255.255.255.0

interface gig 1/2

ip address 192.168.1.2 255.255.255.0

router ospf 100

network 192.168.0.0 0.0.255.255 area 0

[swilk]

Will assigning NAT addresses to the interfaces effect anything? We own a public class B so all my other addresses are public.

Is there a way to add interfaces to the OSPF network without assigning IP addresses to them?