Disabling the IP Packet Checking Function

Context

When the link type of an interface is QinQ or the VLAN mapping or VLAN stacking function is configured on the interface, the system checks IP packets so that the switch cannot transparently transmit IP error packets. In addition, during Layer 2 forwarding, devices cannot transparently transmit packets with the same source and destination IP addresses. To enable the switch to transparently transmit IP error packets, you can disable the IP packet checking function.

Only the S2720-EI, S5720I-SI, S5720-LI, S5720S-LI, S5720S-SI, and S5720-SI support this function.
When the IP packet checking function is disabled, the IP subnet-based VLAN assignment, policy-based VLAN assignment, and IPv6 over IPv4 tunnel functions do not take effect. Therefore, confirm your action before disabling this function.

Procedure

Run system-view
The system view is displayed.
Run interface interface-type interface-number
The interface view is displayed.
Run ip error-packet-check disable
The IP packet checking function is disabled.

By default, the IP packet checking function is enabled.