Wednesday, July 10, 2019

Stratix switches - InterVLAN routing not working properly

I'm running into an interesting issue when I set up VLANs on a couple L2 switches.

I have one purely L2 switch (the Allen-Bradley Stratix 2500) that I configured one VLAN on and a Stratix 5700 that is capable of InterVLAN routing (which works if both devices are plugged into the switch, even if they're on different VLANs). [Btw, Stratix switches are made by Allen-Bradley and sold by Rockwell Automation and the 5700 runs full Cisco IOS BUT there is a web interface called the Device Manager that controls engineers will use, not CLI]

What I have set up: purely L2 managed switch, has an IP address of 10.10.10.90/24 on the default VLAN 1 and a device with IP address 10.10.25.100/24 on VLAN 25. VLAN 25 was added and given a description, but no IP address (SVI). There is a link that connects the 2500 to a 5700 via trunk ports (configured on both ends as Trunk with all VLANs allowed). The 5700 is a beefier switch that is not L3 but allows for InterVLAN routing, which works, like I said, when the devices are plugged straight into the 5700. On the 5700 side, I have a trunk port configured to allow all VLANs connected to the 2500, and configured a VLAN 25 with the same name as on the 2500, but I also added an interface IP for VLAN 25 of 10.10.25.1/24.

I have two devices on VLAN 25. The one that plugs directly into the 5700 has full visibility, including the 2500 default VLAN IP address (10.10.10.90) but not 10.10.25.100. The device plugged into the 2500 on VLAN 25 can't see anything.

The host configuration is as follows: the device that connects to the 5700 has IP 10.10.25.200/24 with gw 10.10.25.1 and the host that connects to the 2500 has IP 10.10.25.100/24 with gw of 10.10.25.1. <---- What should the gateway be for the device that connects to the 2500? There is no interface IP configured on the purely L2 switch, as I want the switch capable of InterVLAN routing to do those functions. Or do I still need a local interface IP for VLAN 25?

[[[ When I set up this topology in Packet Tracer w/ 2960 and 3650, I have full communication. The switches I am using are comparable to those models. Also, I can probably configure the topology through CLI but I want electricians and controls people to be able to do this through the web interface ]]]

Here is a sample topology: https://ibb.co/XJ0XJsW



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