Unanswered Question
Oct 11th, 2009

Hi Experts,

Can someone explain me about below two questions those are..

1. What is the OSPF states and process?

2. What we have to check step by step for one new switch if want to connect in a existing VTP enabled LAN.



I have this problem too.
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Giuseppe Larosa Sun, 10/11/2009 - 22:40

Hello Naidu,

2) before connecting a new switch to production network you need to be sure you have zero-ed the VTP revision number. To do this you can use:

changing vtp domain name to a dummy name

changing vtp mode to transparent.

change vtp domain name to production name

change vtp mode to desired one client or server.

check vtp revision number with

sh vtp status

it should be zero.

Notice that contrary to common belief also connecting a new client switch requires care.


this question is really too broad.

I would suggest you to read




OSPF process =

an OSPF instance running on the router it is associated to a node unique process-id (and integer)

multiple OSPF processes with different process-ids (and different router-ids) can run on a router.

OSPF states =

one possible meaning is a reference to OSPF neighbor stare machine

OSPF doesn't send or accept routing updates from devices that haven't reached a certain state.

normal states are:

FULL/- on a serial or point -to point link

FULL/DR or FULL/BDR full adiacency on a LAN.

2way/DRother normal between two devices that are not DR or BDR on the segment.

OSPF makes a clear distinction between:

neighbors devices in a common subnet with matching OSPF parameters (area-id, area flags, timers)

adjacent, fully adjacent devices: devices that have really exchanged and synchronized the OSPF database for the area the link belongs to.

on a LAN segment all devices sync with DR and BDR in an effort to reduce protocol activity.

Hope to help


ilnaiduccna Sun, 10/11/2009 - 23:33

Hi Giuseppe,

Thanks for your quick response and help full explaination.




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