2910al static route ECMP

[Golob]

Hello all,

I have a question regarding the operation of ECMP on static routes on the 2910. In the manual, it says to refer to the OSPF-ECMP part of the manual for details, but it appears that OSPF uses ip load-sharing setting to load share entire subnets. How does the static route ECMP work? Is it supposed to work like this:

(presume locally attached 10.0.0.0/24 network, .1 is the 2910, .2 and .3 are two next hop routers)

ip route 10.0.1.0/24 10.0.0.2

ip route 10.0.1.0/24 10.0.0.3

ip route 10.0.2.0/24 10.0.0.2

ip route 10.0.2.0/24 10.0.0.3

and in this case 2910 picks 10.0.1.0/24 to be routed to i.e. 10.0.0.2, while 10.0.2.0/24 to 10.0.0.3? In this case, having ECMP for a default route (ip route 0.0.0.0/0 10.0.0.2 and ip route 0.0.0.0/0 10.0.0.3) would result in no load sharing at all?

Regards,

Boštjan

[Oleg Sukharev]

Hi Golob,

I guess second route will replace first route to the same destination. So no balancing will be possible.

Can you please provide a link about ECMP for static routes on 2910al?

Regards,
Oleg

[Golob]

Hello,

it is written on the features page of the 2910al switch. Also, the ip load-sharing command is present.

Regards,
Boštjan