What are the working mechanism and usage scenario of fast leave

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The fast leave function is configured using the igmp-snooping prompt-leave command (for Layer 2 multicast) or the igmp prompt-leave command (for Layer 3 multicast). If this function is not configured, the switch sends a Group-Specific Query message in response to an IGMP Leave message to check whether there are other users in the group specified in the Leave message. After fast leave is configured, the switch directly deletes the interface that receives the IGMP Leave message from the multicast forwarding entry, and does not check whether there are still users in the group.

The fast leave function is applicable only to interfaces with only one user attached. If fast leave is configured on an interface connecting to multiple users, multicast traffic of all users under the interface is interrupted when one user switches to another channel.

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What are the working mechanism and usage scenario of fast leave
The fast leave function is configured using the igmp-snooping prompt-leave command (for Layer 2 multicast) or the igmp prompt-leave command (for Layer 3 multicast). If this function is not configured, the switch sends a Group-Specific Query message in response to an IGMP Leave message to check whether there are other users in the group specified in the Leave message. After fast leave is configured, the switch directly deletes the interface that receives the IGMP Leave message from the multicast forwarding entry, and does not check whether there are still users in the group. The fast leave function is applicable only to interfaces with only one user attached. If fast leave is configured on an interface connecting to multiple users, multicast traffic of all users under the interface is interrupted when one user switches to another channel.

Implementation and application of fast leave of S series switches
For an S series switch, the fast leave function is configured using the igmp-snooping prompt-leave command (for Layer 2 multicast) or the igmp prompt-leave command (for Layer 3 multicast). If this function is not configured, the switch sends a Group-Specific Query message in response to an IGMP Leave message to check whether there are other users in the group specified in the Leave message. After fast leave is configured, the switch directly deletes the interface that receives the IGMP Leave message from the multicast forwarding entry, and does not check whether there are still users in the group. The fast leave function is applicable only to interfaces with only one user attached. If fast leave is configured on an interface connecting to multiple users, multicast traffic of all users under the interface is interrupted when one user switches to another channel.

How do I configure fast leave of a member port on an S series switch
The prompt leave function enables the switch to delete the multicast forwarding entry of a multicast group from an interface immediately after the interface receives an IGMP Leave message for the group. This function saves bandwidth and system resources because the switch does not need to wait until the aging timer of the interface expires. For S series switches excluding the S1700, to enable fast leave of a member port in VLAN 10, perform the following configurations: [HUAWEI] igmp-snooping enable //Enable IGMP snooping globally. [HUAWEI] vlan 10 [HUAWEI-vlan10] igmp-snooping enable //Enable IGMP snooping in VLAN 10. [HUAWEI-vlan10] igmp-snooping prompt-leave //Enable fast leave of a member port in VLAN 10.

Working mechanism of IPSec on AR series routers
Huawei AR series routers support IPSec. Most data is transmitted in plain text on the Internet. This transmission mode has many potential risks. For example, bank account and password data may be intercepted or tampered, and user identities are used, and malicious attacks occur. After IPSec is deployed on the network, transmitted IP data is protected to reduce risks of information leakage. IPSec is a security protocol suite defined by the Internet Engineering Task Force (IETF). IPSec secures data transmission on the Internet through data origin authentication, data encryption, data integrity check, and anti-replay functions. For details, see Configuration Guide-VPN.

DNS proxy working mechanism on the USG6000
The working process of DNS proxy is as follows: 1.The DNS client sends a request packet to the DNS proxy. The DNS proxy IP address is the destination address of the request packet. 2.After receiving the request packet, the DNS proxy searches for DNS entries saved in the local domain name resolution tables. ?If mapping information exists, the DNS proxy sends a reply packet carrying the resolution result to the DNS client. ?If no mapping information exists, the DNS proxy sends the request packet to the DNS server for resolution. 3.After receiving the reply packet from the DNS server, the DNS proxy records the resolution result and forwards the reply packet to the DNS client.

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