How does an S series switches process received routing protocol packets

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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.

Other related questions:
How does the S series switch receive the routing protocol message?
When the S-series and E-series switches receive the protocol packets, the main control board (CPU) and the main control board (CPU) complete the related calculation and send the control message to update the routing information of the service board

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 the switch process received Flush packets of smart link
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.

Prevent OSPF interfaces on S series switches from sending and receiving protocol packets
To prevent local OSPF routing information from being obtained by devices on other networks and prevent the local S series switch from receiving routing update information advertised by other devices on the same network, run the silent-interface command in the OSPF process view to forbid an OSPF interface on the local switch from sending and receiving OSPF packets. By default, an interface is allowed to receive OSPF packets. Disabling interfaces from receiving and sending OSPF packets is a method of preventing routing loops. After an OSPF interface is prevented from sending and receiving OSPF packets, the interface can still advertise its direct routes. Hello packets on the interface, however, cannot be forwarded. Therefore, no neighbor relationship can be established on the interface. This enhances the networking adaptability of OSPF and reduces system resource consumption. For example, disable VLANIF 200 from sending and receiving OSPF packets as follows: [HUAWEI] ospf 100 [HUAWEI-ospf-100] silent-interface vlanif 200

S series switches routing protocol priority problem
default: - Direct�? - OSPF�?0 - IS-IS�?5 - Static�?0 - RIP�?00 - OSPF ASE�?50 - OSPF NSSA�?50 - IBGP�?55 - EBGP�?55

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