Setting up RSTP and Sonicwall TZ300.

Hi, could use some direction here, as I have no experience with the Sonicwall.

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Currently, the customer has a flat network, with two ports being used in the Sonicwall, WAN, and LAN.

There are currently 3 cabs.

Core Cab:

- 2 x Leased Lines

- 1 x Sonicwall TZ300

- 2 x GS1920HP Switch (1 directly plugged into LAN port & the other is used for a wireless network within the warehouse)

Cab 1:

5 x Cisco SF300

Cab 2:

5 x Zyxel GS1920HP

Idea:

Setup RSTP, give core switch lowest priority, followed by 1 x Cisco SF300 in Cab 1, then the others. However, i wanted to see if it was possible to configure one of the other ports on the Sonicwall to act as a LAN port should the main line into the core switch fail.

It's been some time since i've done any kind of networking, so just a few more opinions would really help.

Thanks.