How does the switch process received Flush packets of smart link

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After receiving Flush packets of Smart Link, the switch checks the password in the Flush packets. If the control VLAN and password in the Flush packets are the same as those configured on the interface, the switch deletes MAC address entries. If the control VLAN and password in the Flush packets are different from those configured on the interface, the switch discards the Flush packets. Different versions delete MAC address entries differently:

--V100R002 and V100R003: delete global MAC address entries.
--V100R005, V100R006, V200R001, and V200R002: delete only MAC address entries on the interface with the smart-link flush receive command configured.
--V200R003 and later versions: delete only MAC address entries on the interface where the smart-link flush receive command is configured and the control VLAN specified in the command is the same as the control VLAN in the Flush packets.

Other related questions:
How does an S series switches process received routing protocol packets
Q: How does an S series switches process received routing packets? A: After receiving a routing protocol packet, an S series switches sends it to the MPU. After calculation, the MPU delivers control messages to an LPU for routing information updates.

How does an S series switch process UDP packets when it functions as a Layer 2 switch
If an S series switch (except the S1700) functions as a Layer 2 switch, it does not identify UDP or TCP packets by default. The switch only forwards packets based on its original MAC address table.

How does a QinQ-enabled interface process a received packet that carries the non-C-VLAN tag
If the VLAN ID of the packet is within the configured QinQ C-VLAN range, the VLAN tag is added to the packet according to the configuration. If the VLAN ID of the packet is not within the configured QinQ C-VLAN range or the packet does not carry any tag, the packet is processed as follows: If the qinq vlan-translation miss-drop command is used, the packet is directly discarded. If the qinq vlan-translation miss-drop command is not used on the interface but the default VLAN ID is used, packets are tagged with the default VLAN ID before being forwarded.

Congestion management mechanism on an S series switch
On S series switches (except S1700), each physical port has eight sending queues numbered from 7 to 0 in descending order of priority. Queue 7 has the highest priority and queue 0 has the lowest priority. Sending ports support the following queue scheduling modes: PQ, WRR, DRR, PQ+WRR, and PQ+DRR. When PQ+WRR or PQ+DRR is used, packets in PQ queues are scheduled first. The PQ queue with the highest priority is scheduled preferentially and then PQ queues with lower priorities are scheduled in succession. After all PQ queues are scheduled, WRR or DRR queues are then scheduled. For WRR and DRR queues, the queues are scheduled to ensure bandwidth first and then scheduled based on weights. The S5720HI fixed switch and X series cards of S series modular switches do not support WRR and PQ+WRR scheduling.

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