How do S series switches process CDP packets

23

Huawei S series switches (except the S1700) transparently transmit Cisco Discovery Protocol (CDP) packets.

Other related questions:
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.

With IPSG enabled, how will an S series switch process IP packets that do not match the binding table?
With IPSG enabled, an S series switch (except the S1700) checks IP packets against a DHCP snooping dynamic binding table or static binding table. Before the switch forwards an IP packet, it compares the source IP address, source MAC address, interface, or VLAN information in the IP packet with entries in the binding table. If a matching entry is found, the switch considers the IP packet as a valid packet and forwards it. Otherwise, the switch considers the IP packet as an attack packet and discards it. Whether an IP packet sent from a terminal connected to a port matches a binding entry or not has no effect on the status of the port (for example, the port will not change from the up state to the shutdown or error-disable state).

Is LLDP compatible with CDP on S series switches
On Huawei S series switches (except the S1700), LLDP is compatible with similar protocols from other vendors to obtain status information about non-Huawei devices. For example, LLDP is compatible with CDP. The configuration procedure is as follows: 1. Enable LLDP globally. [HUAWEI] lldp enable 2. Configure CDP-compatible LLDP on an interface. [HUAWEI] interface GigabitEthernet 0/0/1 [HUAWEI-GigabitEthernet0/0/1] lldp compliance cdp receive

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.

If you have more questions, you can seek help from following ways:
To iKnow To Live Chat
Scroll to top