No relevant resource is found in the selected language.

This site uses cookies. By continuing to browse the site you are agreeing to our use of cookies. Read our privacy policy>Search

Reminder

To have a better experience, please upgrade your IE browser.

upgrade

Configuration Guide - Device Management

S1720, S2700, S5700, and S6720 V200R011C10

This document describes the principles and configurations of the Device Management features, and provides configuration examples of these features.
Rate and give feedback:
Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Inter-Device Link Aggregation and Local Preferential Forwarding

Inter-Device Link Aggregation and Local Preferential Forwarding

Inter-Device Link Aggregation

A stack supports inter-device link aggregation through Eth-Trunks between devices. You can bundle physical Ethernet interfaces on different member switches into an Eth-Trunk interface and connect the stack to an upstream or downstream device through the Eth-Trunk link. If a member link of the Eth-Trunk or a member switch fails, traffic on the link or switch can be distributed to other member links through the stack cables connecting the member switches. Inter-device link aggregation implements link backup and device backup to ensure reliable data traffic transmission.

As shown in Figure 9-17, traffic sent to the core device on the network is equally distributed to member links of an Eth-Trunk set up between stack member switches. When a member link fails, traffic on this link is distributed to the other link through the stack cables connecting the member switches. This link backup mechanism improves network reliability.

Figure 9-17  Implementing link backup through inter-device Eth-Trunk

As shown in Figure 9-18, traffic sent to the core device on the network is equally distributed to member links of an Eth-Trunk set up between stack member switches. When a member switch fails, traffic toward this switch is distributed to the other switch. This device backup mechanism improves network reliability.

Figure 9-18  Implementing device backup through inter-device Eth-Trunk

Local Preferential Forwarding

Inter-device link aggregation implements reliable data traffic transmission and backup between member switches. Because a stack cable provides limited bandwidth, inter-device forwarding increases the load on stack cables and reduces forwarding efficiency. To improve the forwarding efficiency and reduce traffic on stack cables, the switch provides the local preferential forwarding feature. After this feature is enabled on the device, traffic reaching the local switch is preferentially forwarded through a local interface. If the local device has not outbound interface or all the outbound interfaces fail, traffic is forwarded through an interface on the other member switch.

As shown in Figure 9-19, SwitchA and SwitchB form a stack, and their uplink and downlink interfaces are bundled to Eth-Trunk interfaces. If local preferential forwarding is not configured, traffic reaching SwitchA is load balanced between the Eth-Trunk member links. Some traffic is forwarded from SwitchA to SwitchB through the stack cables and is sent out from a physical interface on SwitchB. If local preferential forwarding is configured, traffic reaching SwitchA is forwarded through a local physical interface and does not pass through the stack cables. By default, the local preferential forwarding function is enabled on the device.

Figure 9-19  Local preferential forwarding
Translation
Download
Updated: 2019-03-28

Document ID: EDOC1000178167

Views: 197332

Downloads: 944

Average rating:
This Document Applies to these Products
Related Documents
Related Version
Share
Previous Next