Westermo MDI-112-F4G - Manual (Page 83)

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incoming frames belong to the VLAN they claimed or not. Then the port
determines if the frames can be processed or not. For example, if a tagged frame
from Engineer VLAN is received, and Ingress Filtering is enabled, the switch will
determine if the port is on the Engineer VLAN’s Egress list. If it is, the frame can
be processed. If it’s not, the frame would be dropped.