As title, layer 3 switches the hardware routing table and what is the difference between software routing table? Why not to query in the hardware routing table to software query in the routing table? Hardware and software routing table is not the content of the routing table is consistent?

CodePudding user response:

Although I don't really understand, but as far as I can understand roughly, said if wrong, please forgive me
Because the main function of layer 3 switches is still the data exchange, so it is usually an easy routing functions, you say the hardware should be the MAC address table is the MAC address and switches the logical relationship of the interface table, is responsible for the 2 data forwarding, and the software is the routing table is a list of IP address can reach range, the equivalent network maps, in charge of three layer data forwarding; MAC is fixed, but the IP can be changeable

CodePudding user response:

reference 1st floor laiang8283 response:

although I don't really understand, but as far as I can understand roughly, said if wrong, please forgive me
Because the main function of layer 3 switches is still the data exchange, so it is usually an easy routing functions, you say the hardware should be the MAC address table is the MAC address and switches the logical relationship of the interface table, is responsible for the 2 data forwarding, and the software is the routing table is a list of IP address can reach range, the equivalent network maps, in charge of three layer data forwarding; MAC is fixed, but the IP can be changeable

long horizons

CodePudding user response:

ASIC chip in the storage at the same time of layer 3 switches turn CAM table and three layers on the second floor, the routing table and the ARP table stored in the memory software, by the CPU calls, both using high-speed switching performance of hardware module, and use of the flexibility of software modules, ASIC internal contain used for forwarding the MAC address table on the second floor and turn three layers published for IP forwarding, CPU is mainly used to control the forwarding, routing table maintenance software and software ARP table, and according to the software table of forwarding information to configure the ASIC hardware published three layers turn,
The hardware routing table is based on software to configure the routing table
With reference to the king of the "deep understanding of the computer network" on page 387