Best path selection for EIGRP

[sarabjeetg]

                   I have a lab setup for eigrp R1 has 5 equal links to reach R7 , with same bandwidth, On what cretirea it will select best 4 next hops to reach R7.

[Mir Navazish Ali]

Hi Sarabjeet,

the cost calculation for EIGRP would also include the delay as well, If you are using a different media then the cost would vary due to the :"delay" component in the cost calculation, however if you are using the same media and the same cost then it should load balance.

Thanks

Mir

[sarabjeetg]

Thanks Mir for your response, I am using the same media, by defult on 4 routes will be loadbalnced  and i will learn route s from 4 routers  on R1, so what will be creitiera thet it will select which 4 routers, if all parameters are same..

[Mir Navazish Ali]

It will load balance if the cost are the same all the 4 paths would be seen in the RIB. However. the actual traffic would be forwared based on the per-destination. Like if you have a single destination route it would not load balance the traffic to the same destination over the 4 links, it would use only a single link based on which CEF decides as oer per-destination load balancing.

Regards,

Mir

[sarabjeetg]

Agree Mir with You, If i see Topology table on R1 it will show me all 5 paths to R 7 and in routing table it will take 4 paths out of 5 path . what will be cretireia that R1 routing table will take these four path in routing table or 4 routes .

[Mir Navazish Ali]

Based on first come first serve(logically)

[Joseph W. Doherty]

Disclaimer

The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.

Liability Disclaimer

In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.

Posting

If this isn't clearly documented, I would suggest assuming it's indeterminate and not depend on what paths might be chosen.