Which Forwarding Modes Does ELB Support?

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ELB supports the following forwarding modes:



  • Round robin: sends requests to backend ECSs in polling mode. This forwarding rule applies to short-connection services, such as the HTTP service.

  • Least connections: preferentially sends requests to the backend ECS with the least connections. This forwarding rule applies to long-connection services, such as the database service.

  • Source IP address: calculates the hash value of the request source IP address and sends requests to a matched ECS. This forwarding rule ensures that requests initiated from the same source IP addresses are sent to a fixed ECS. This rule applies to TCP connections of load balancers that do not use cookies.



Other related questions:
Which forwarding mode does the AR support when it functions as an AC
The AR supports local forwarding but not centralized forwarding to transmit service data packets.

Data forwarding mode
Data forwarding mode: - Centralized forwarding (also called tunnel forwarding): APs set up control tunnels and data tunnels with an AC. Control data between the AP and AC and service data from WLAN users are encapsulated in the control tunnel and data tunnel, respectively. After the service data reaches the APs, it must be sent to the AC through the data tunnel first and then be forwarded at L2 and L3. - Direct forwarding (also called local forwarding): APs only set up control tunnels with an AC. After the service data reaches the APs, it directly enters the wired network through the switch that connects to the APs and then be forwarded at L2 and L3. In summary, tunnel forwarding facilitates centralized management and control, and service data must be forwarded through an AC, reducing packet forwarding efficiency and burdening the AC. For direct forwarding, packet forwarding efficiency is high. You can select either of the forwarding mode as required. AC deployment - Bypass mode ACs are directly connected to aggregation switches or core switches in bypass mode. If two ACs provide 1+1 backup, they connect to the aggregation switch or core switch. - Establish an independent AC management area that connects to the core switch in bypass mode. In actual networking, an aggregation switch is connected to the core switch in bypass mode, and all the ACs are connected to the aggregation switch. Verify the forwarding mode by checking that an AC serves as the gateway or running the display forward-type service xx command.

Which aging modes does an SA support
A security association (SA) supports the following types of lifetimes: -The time-based lifetime: the period of time an SA can exist after it is established. -The traffic-based lifetime: the maximum traffic volume that an SA can process. When the specified time or traffic volume is reached, the SA becomes invalid. When the SA is about to expire, IKE will negotiate a new SA for IPSec. In this manner, a new SA is established when the old SA becomes invalid. Before the new SA is established, the two ends use the old SA to protect data flows. When the new SA is established, the two ends immediately use the new SA.

Which upgrade modes does an AP support
Currently, an AP can be upgraded using the AC, FTP, or SFTP. - AC loading: The target version file of the AP is saved on the AC. During loading, the AC sends the target version file to the AP using CAPWAP. - FTP loading: The target version file of the AP is saved on the FTP server. During loading, the AP logs in to the FTP server and obtains the target version file. - SFTP loading: The target version file of the AP is saved on the SFTP server. During loading, the AP logs in to the SFTP server and obtains the target version file. For information about how to configure AP upgrade modes, see "How do I configure an AP's upgrade mode."

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