static route

amansoi_5 · ‎04-04-2007

Dear All,

Do we need to have same AD while configuring static routes?

Also, if they are different , does it affect ?

aman

ankbhasi · ‎04-04-2007

Hi Aman,

By default the static routes pointing to next hop ip address have AD as 1 and static routes pointing to exit interface has AD as 0 but it is not mandatory that you define AD with all static routes.

If you want to define some AD other than default one then it is called as floating static routes. Its optional and depends on your requirement and network needs.

By default static routes are preferred over any routing protocols because all routing protocols have higher admin distance but if you want that your routing protocol should be preferred first and then static routes you can define a static route with higher admin distance then your routing protocol.

HTH

Ankur

*Pls rate all helpfull post

spremkumar · ‎04-04-2007

Hi

If you think off having load balancing between multiple links connecting to the same destination then you dont need an AD attached to the routes defined.

If you need fail over/redundancy functionality then you will need to have an AD attached to the route which you prefer to use as a secondary link..

regds

amansoi_5 · ‎04-04-2007

Sir,

suppose we take a case where Leased line is primary link & ISDN is Secondary. In case of failure of Leased, we have configured ISDN but with different ADs at dialing & receiving end.

will have this any effect?

aman

spremkumar · ‎04-04-2007

Hi Aman

If you have LL and ISDN and want to have active/standby concept with the resources then you need to make use of AD to the route pointing via the BRI interface.

regds

ankbhasi · ‎04-04-2007

Hi Aman,

I believe you must be running some routing protocol over your lease lines and you do not want routing protocol to be running for your isdn?

Its perfectly fine because when your lease line will go down the only way to go out will be your isdn and you need to have some static route with higher admin distance to take care of the same.

If you do not keep static route admin distance as higher then all your routes traffic will follow your ISDN line even when your lease line is UP which is not preferred.

So in this case static route with admin distance is required for standby purpose incase you lease line goes down.

HTH

Ankur