what element affect ospf MD5 result!

[fly]

customer replaced a chassis of gsr, and forgot ospf md5 key.  he use encrypt password from config to config ospf neighbor. he found some neighbor is up.

but some ospf neighbor can't get up.

what affect ospf MD5 comute result!

  thank you!

Tom

[cadet alain]

Hi,

if you are doing authentication in OSPF then your password must match on both ends otherwise your adjacency will go down, the authentication type must also be the same.When no key is configured on the interface then the router assumes this is the NULL key.

I don't know if GSR uses the IOS and/or same syntax as on other devices but if so then you can issue the following commands:

-sh run | s router ospf

-sh run interface

-sh ip ospf nei

and then for each neighbour do the 2 first commands.

you could also do a debug ip ospf adjacency so you'll know why the neighbours don't come up.

Regards.

Alain.

[fly]

Hi Alain

     thank you!

     ios will comupte MD5 value for ospf , i want to know how router computer md5 for ospf.

      customer using encrypt password from backup configration file to config md5 after replace the RP and chassis, not using key, because customer forgot key.

    customer found some neighbor is up, some neighbor is down. but the interface ,config ,ios ver is same as old chassis.

    i want to know what element can affect router compute md5 result.

    thank you!

Tom

[fly]

Hi

    from another aspect.

    step 1 we config ospf md5 authentication for one ospf neighbor,the neighbor is up. we got a md5 string.

    step 2 if we delete this config, and reconfig ospf md5 authentication , everthing has not  changed, only reconfig. what md5 string we got, i think it is same as step 1 is that right.

     thank you!

Tom

[cadet alain]

Hi,

maybe this should help even if I don't totally understand your problem.

http://tools.ietf.org/html/draft-ietf-ospf-md5-02

and yes nothing has changed if you still use the same config.

fly a écrit:
customer using encrypt password from backup configration file to config  md5 after replace the RP and chassis, not using key, because customer  forgot key.

what you mean by that? type 7 can be decrypted on the router.

Regards.

Alain.