Static Route problem

[reidd7]

I'm not sure if this is a problem or a misconfiguration but I could do with some help please.

We have a A5120 SI 3 layer switch setup with 2 Vlans,  Vlan 1 172.18.4.2/23 and Vlan 2  172.18.20.2/22 the switch trunks to a Sonicwall TZ210 for internet access. 

The Sonicwall has two subinterfaces 172.18.4.1/23 and 172.18.20.1/22 for both subnets and I can ping the switch and Sonicwall subinterfaces from the clients.

The problem I'm having is with the default route for internet access. What should this be??

If I add the following 2 routes only one route shows as active and that Vlan has Internet access, if I remove one off the static routes then the remaining route becomes active. What I need is both routes to be active so both Vlans can access the internet at the same time.

Static routes

0.0.0.0 0.0.0.0 172.18.4.1 

0.0.0.0 0.0.0.0 172.18.20.1

I tried adding one static route to the primary interface but the switch couldn't see the network I assume the Sonicwall is dropping the packets. 

Any help/advise would be grateful as to how i can get both Vlans to share an internet connection.

Thanks

[manuel.bitzi]

Hi reidd

The A5210-SI does not support ECMP (multiple routes to the same destination). I could not understand why to use it on a switch like this (no dyn routing). And I dont understand your application nor network topology.

br

Manuel