OSPF md5 authentication

[spyoung]

Hi,

I have a question about the impact of activating md5 authentication.

I would like to activate md5 authentication across a single area. If I change only 2 adjacent routers from the 8 or so in the whole area, they refresh their neighbor and adjacency relationship, re-synchronise and continue as before but working with md5 now.

What about the remaining routers in that area - will they continue to exchange updates as before with each other - but no longer with the adjacent two running md5, until all arouters in that area are using md5?

My point is, can I phase the activation of md5 authentication, or will I have to do the whole area in a single instance to avoid a broken opsf area?

[smif101]

What you can do is enter the MD5 command under the OSPF process of all the routers first. This should still keep everything up and running. Then you can start adding the authentication commands under the interfaces one network at a time.

[dre7779]

I am new at this and I need to know commands for enabling OSPF and EIGRP and redistibute on the 4006 and the 6509 Cat switch can you help me.