how to compare performance after tune OSPF network

[Maivoko]

besides fast convergence time and least number of topology change

which command and in which content can compare performance after tune OSPF network

[Flavio Miranda]

Hi,

 Try to transfer  files using iPerf.  Would be better if you had transfered something before for comparison.

[Maivoko]

If in packettracer or gns3,

how to compare ?

[Flavio Miranda]

GNS3 you can integrate with VMs. Packetracert is more limited.

[Georg Pauwen · Accepted solution]

Hello,

which OSPF parameters have you changed, and what does your topology look like ? Below is a list of all the OSPF debug commands:

Router#debug ip ospf ?
adj OSPF adjacency events
database-timer OSPF database timer
events OSPF events
flood OSPF flooding
hello OSPF hello events
lsa-generation OSPF lsa generation
mpls OSPF MPLS
nsf OSPF non-stop forwarding events
packet OSPF packets
retransmission OSPF retransmission events
spf OSPF spf
tree OSPF database tree

[Maivoko]

Ispf level 1 and timer throttle spf and hello timer

is there more parameters that can improve ospf?

moreover, I see timer throttle spf use topology change time just more than it little

where can find this change time?

i know spanning tree topology change

but where is ospf topology change time for timer throttle spf?

[Joseph W. Doherty]

Cisco has a info on tuning both OSPF or EIGRP. See if you can find in on their main site.

[Maivoko]

If there is one path from one area and another area and near no topology change 

can we adjust hello timer to maximum time?

[Joseph W. Doherty]

Yea, you could, but the whole point it to catch the loss ASAP. Otherwise you might black hole traffic for the duration of the hello timer timeout.

[Maivoko]

What do it mean to catch the loss?

how to find this loss?

why do no topology change have loss?

[Joseph W. Doherty]

For "catch the loss" I have in mind the loss of a link.  However it could also be the addition of link, but adding links often doesn't have the impact to traffic that losing a link does.

Finding the link loss (or addition) would be by monitoring the route table and/or OSPF database.

A topology change would cause a loss (or addition), but neither might not impact traffic.

[Maivoko]

How to simulate this loss or reproduce this loss situation?

[Joseph W. Doherty]

Manually remove or add a network to the topology.

[Maivoko]

If there is no addition or remove link in bank network

where is the smallest number of topology change come from? 

[Joseph W. Doherty]

If there is no change to topology, you shouldn't be receiving topology changes.