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VLAN and 2nd WAN port, SBCS

ambleside
Level 1
Level 1

I wanted to run this plan by some others before I screw something up.

Client is adding 2nd WAN link via wireless.  There is not additional cabling from the wireless location down to the control room but there is a switch nearby.  All switches are ESW-540's - the closet switches are the 8 port, the aggregation switch is a 24 port.

My primary worry is that on the LAN side, the SA540 bridges the ports - there isn't a true VLAN. 

I expect if the WAN interface is only tagged traffic and the router has no knowledge of VLAN 400 - just another cable from the agg switch - that I won't have VLAN1 traffic hitting the optional wan port.  But I'm worried. Diagram is below.  Comments welcome.  Coastnet is current ISP, Skyline is new addition.

Thanks,

Aaron

http://www.gliffy.com/pubdoc/2914001/L.png

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