单选题
发布日期:2020-04-13
QoS preclassification is only supported on generic routing encapsulation (GRE) and IPsec VPNs
QoS preclassification is not required in Layer 2 Tunneling Protocol (L2TP), Layer2 Forwarding (L2F), and Point-to-Point Tunneling Protocol (PPTP) VPNs
QoS preclassification is supported on IPsec AH VPNs, but not on IPsec ESP VPNs
the QoS-for-VPNs feature (QoS preclassification) is designed for VPN transport interfaces
with IPsec tunnel mode, the type of service (ToS) byte value is copied automatically from the original IP header to the tunnel header
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