Which CPU process is relevant to NAT

1

In the display cpu-usage command output, the VALP process is relevant to NAT. The CPU usage of the VALP process is high because the device enabled with NAT ALG sends packets to the control plane. To reduce the CPU usage, delete unnecessary ALG configuration.

Other related questions:
What is the meaning of each process that occupies CPU resources on S series switches
On S series switches (except the S1700), run the display cpu-usage command to view the CPU usage of each process. For meanings of common processes, see the following details: - For the S12700, see "High CPU Usage" in S12700 Troubleshooting - Preliminary. - For the S7700 and S9700, see "High CPU Usage" in S7700&S9700 Troubleshooting - Preliminary. - For the S1720, S2700, S3700, S5700, and S6700, see "High CPU Usage" in S1720&S2700&S3700&S5700&S6700 Troubleshooting - Preliminary. - For the S9300, see "High CPU Usage" in S9300 Troubleshooting - Preliminary. - For the S600-E, see "High CPU Usage" in S600-E Troubleshooting - Preliminary.

Meaning of VRPI process in CPU usage on S series switches
On S series switches, the VRPI process loads configurations. When a switch starts, you need to load the configuration, which causes high CPU usage of this process. After the configuration is loaded, the CPU usage is restored to normal state.

Which interfaces support NAT
The following interfaces support NAT: -Physical interfaces Layer 3 Ethernet interface, Layer 3 GE interface, G.SHDSL interface, VDSL interface, PON interface, serial interface, POS interface, asynchronous interface, ATM interface, BRI interface, and cellular interface -Logical interfaces Dialer interface, tunnel interface, Layer 3 Eth-Trunk interface, VE interface, VT interface, MP-group interface, MFR interface, and IMA-Group interface -Sub-interfaces Ethernet sub-interface, Eth-Trunk sub-interface, ATM sub-interface, serial sub-interface, MFR sub-interface, IMA-Group sub-interface, and POS sub-interface

Whether the NAT ALG supports the fragmented packet processing
The NAT ALG does not support the fragmented packet processing.

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