In 802.1Q trunking, the native vlan is not tagged. Only non-native VLANs are tagged. This allows you to connect a non-trunk device into a dot1q trunk port and still function properly on the native VLAN. Other than that, it does not serve a function. Yes, it must match on both sides of a trunk, because both switches must agree on what VLAN untagged packets belong. I beleive that ISL tags all packets and does not have a native VLAN.
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