ospf adjacency

[engreda22]

Dear all ,

please what is the correct answer of the below question

how to prevent OS PF adjacency issues can occur by mismatch interface type ?

1- enable MTU ignore feature

2- configure the environment as point -to-point network

3- enable capability-transit feature

4- increase or decrease the hello interval

[Deepak Kumar · Accepted solution]

Hi,

Your question header and actual question making confuse to reader. 

if your question is "how to prevent OS PF adjacency issues can occur by mismatch interface type ?"

Than My answer is point -to-point network (option 2).

or If

Your question belongs to MTU Ignore feature than

Enable MTU ignore feature is useful. The interface command ip ospf mtu-ignore disables this check of the MTU value in the OSPF DBD packets. Thus, use of this command allows the OSPF adjacency to reach the FULL state even though there is an interface MTU mismatch between two OSPF routers.

Regards,

Deepak Kumar

[Richard Burts · Accepted solution]

If you think about it the question asks about problems for OSPF mismatch interface types. MTU ignore does not deal with interface types. Neither does capability-transmit. The only option that deals with interface types is setting them as point to point. So 2 is the correct answer.

HTH

Rick

[engreda22]

thanks for your reply . what the benefit of applying this command and what is the related affect to the adjacency issue ?
first option can be applied any time and in any situation but the option you choose can applied only in loopback interfaces as i think . am i right ?

[Richard Burts]

Setting the interface type as point to point can be done on many types of interface and is not restricted to loopback interfaces.

HTH

Rick

[Deepak Kumar]

HI,

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@engreda22 wrote:
thanks for your reply . what the benefit of applying this command and what is the related affect to the adjacency issue ?
first option can be applied any time and in any situation but the option you choose can applied only in loopback interfaces as i think . am i right ?

---

I hope you are talking about Point-to-Point network..

This is the simplest form of the network types: Two devices (routers) are connected together with a single link. An example of a point-to-point link is a serial link connecting just two routers (using HDLC or PPP). With point-to-point links, OSPF does not select a DR or BDR. Also, hello packets are sent to the multicast address 224.0.0.5.

Regards,

Deepak Kumar