The "behave like they are connected to SSID" function dictates what SSID and therefore the associated VLAN it's configured for is mapped to the ethernet port of the repeater. So, this port specifically. In this example I show standard mesh (not multi VLAN mesh like shown above) and the config maps to a SSID that is configured for VLAN 80. This means the repeater ethernet port is in VLAN 80 and subsequently everything connected to it will also be in VLAN 80. In standard mesh the "behave like" config is important in order to make sure all connected things downstream of the repeater's wired port are on the correct VLAN. With multi VLAN mesh the "behave like" setting is slightly less relevant because now the wireless mesh link is a trunk and can carry all VLANs. So regardless of what SSID the "behave like" setting points to it's now carrying all VLANs so you can configure whatever you want for the repeater side switch mgmt IP, client VLANs, etc.
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