Hello all
For a project I am working on we have the setup as is shown in the picture 1. Since P300 doesn't transmit BPDU messages the idea here is to have two Layer3 links over both of them and static routes. Cisco L3 switches are used because in case one link fails the route gets taken out from the route table and all traffic is redirected through one link (for more robustnes we can also use SLAs). Currently I am looking for a confirmation or a PoC that such a setup can work. Unfortunatelly I don't have the equipment to test it myself since the project is still in early stage. What I did is I tried to simulate the setup but I am stuck. I have two clients connected to normal L2 switch which is connected to L3 switch via trunk port on both sides so I can simulate trunk connections. Used vlans are VLAN 10 and VLAN 20 with each client in his vlan. The L3 switches are connected with two physical links on g0/1-2 interfaces. I use no switchport and assaign ip addreses to both interfaces (for example 192.168.40.0/30 for one link and 192.168.50.0/30 for the other). Then I have created SVI interfaces on L3 switches for each VLAN. I use ip route 0.0.0.0 0.0.0.0 next-hop ip for both links on both L3 swithces. And here it stops. I have connectivity from clientA to L3A switch on one side, but I do not recieve replays from the interface on the other L3B switch. The second picture shows my ip route on L3A route.
The problem I am facing or I am having is with connecting the same networks over L3 link. Since trunk port has many Vlans, I have to reroute them over L3 link to the other side with the same network and vice versa. Is this even possible since both swithces have directly connected networks and if a packet form side A comes to L3SA it just sends it back since in the routing table network A is directly connected?
picture 1: http://imgur.com/a/4crKV
picture 2: http://imgur.com/a/KQnAb
