Why resources are insufficient after N:1 VLAN mapping is configured

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In V100R003 and later versions, the reverse traffic of VLAN mapping matches the mapped VLAN and source MAC address of original packets. The system delivers ACL rules and replaces the VLAN ID of original packets, consuming too many ACL resources.

Other related questions:
Why are services unavailable after N:1 VLAN-MAPPING is configured for a port
The N:1mapping backward traffic does not support the broadcasting, unknown unicast, and reserved multicast. Therefore, you must first ping the peer device on the N side. If you cannot first ping a downstream device on the peer device. This has huge impact on services. Therefore, do not use this function in networking.

Resource mapping creation on OceanStor ReplicationDirector
If the protected object is a FusionSphere VM, then map virtualization resources from the protected site to the disaster recovery site so that the VM can be recovered at the disaster recovery site based on the target attributes specified during resource mapping. For FusionSphere VMs, different resource mappings must be created due to differences in disaster recovery methods and applicable cloud platforms. 1. Storage replication disaster recovery For VMs built on the FusionCompute cloud platform, you must create resource mappings for port groups and clusters/hosts. For VMs built on the FusionManager cloud platform, you must create resource mappings for clusters and networks. Resource mappings for security groups are optional. If the VMs that require disaster recovery have been added into a security group, you must create resource mappings for that security group. 2. Host replication disaster recovery: For VMs built on the FusionCompute cloud platform, you must create resource mappings for clusters/hosts, port groups, data stores, and Virtual Replication Gateways (VRGs). For VMs built on the FusionManager cloud platform, you must create resource mappings for clusters, networks, and VRGs. Resource mappings for security groups are optional. If the VMs that require disaster recovery have been added into a security group, you must create resource mappings for that security group. One resource at the production site or disaster recovery site can be mapped to only one resource of the same type. In remote disaster recovery mode, this operation must be performed at the production site.

Calculate the number of PFC frames required to enable full backpressure on an interface
Priority-based Flow Control (PFC) is a flow control mechanism based on priority. After the data center bridging (DCB) function is enabled on a switch and negotiation succeeds, the switch stops sending packets in the corresponding priority queue when it receives PFC frames. Number of required PFC frames = Interface bandwidth/[512 x Time(n)] Time(n) indicates the backpressure timer value. The unit is the time an interface uses to send 521 bits.

An error message is displayed during the mirroring configuration on an S series switch
If an error message similar to the following is displayed when you configure the mirroring function on an S series switch: Error: Insufficient observe-port resource. It indicates that the number of configured observing ports has reached the upper limit. To perform new mirroring configuration, delete unnecessary mirroring configurations or other service configurations that use observing port resources. For example, MPLS OAM or BFD configuration consumes observing port resources on some devices. Alternatively, use other features to implement traffic monitoring.

Why inner tags are removed when the VLAN-Mapping transparently transmits double-tagged packets after the VLAN-Stacking is configured
In S2752, S3752, S5752EI V100R003, and subsequent versions, after the VLAN-Stacking and VLAN-Mapping are configured on outbound ports, inner tags are removed when cross-chip double-tagged packets are transparently transmitted, interrupting services. During the configuration, set the two ports for forwarding to the same chip.

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