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[Q&A]The member of Eth-trunk interfaces don’t load balance

Latest reply: Oct 27, 2018 14:00:08 1147 14 10 0

The network topology like below:[Q&A]The member of Eth-trunk interfaces don’t load balance-2775899-1

[Q&A]The member of Eth-trunk interfaces don’t load balance-2775899-2
The issue is that the member of eth-trunk interfaces don't load balance, the Utilization of interface G0/0/1 is about 80%, and the Utilization of interface G1/0/1 is about 40%, and the Utilization of interface G2/0/1 is about 10%.
Checking the configuration of the eth-trunk interface, it configured with mode lacp.Checking the utilization of all interface, and found that most of traffic is coming from slot0, and a party of tarffic is coming from slot1, and only a litte traffic is coming from slot2.Due to on a network where a stack and an Eth-Trunk are used, it is default configuring the Eth-Trunk to preferentially forward local traffic increases bandwidth use efficiency between devices in the stack and improves traffic forwarding efficiency.It indicates that the most of traffic is coming from slot0 and will be forwarding to G0/0/1 due to local preference forwarding.So there are two ways solve this issue:1. disable the function of local preference forwarding function on this eth-trunk interface;interface eth-trunk 1undo local-preference enable2. change all the member of eth-trunk interfaces to one slot.
ATTN: If disable the function of local preference forwarding, it will increase the traffic on stack port;If change all the member of eth-trunk interface to on slot, it will increase the security issue, if this slot fault,  all traffic will be impacted.

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No.9527
Created Oct 15, 2018 00:56:59 Helpful(0) Helpful(0)

To ensure proper load balancing between physical links of an Eth-Trunk and avoid link congestion, use the load-balance command to set the load balancing mode of the Eth-Trunk.
Load balancing is valid only for outgoing traffic; therefore, the load balancing modes for the interfaces at both ends of the link can be different and do not affect each other.
You can set the load balancing mode based on traffic models. When a parameter of traffic changes frequently, you can set the load balancing mode based on this parameter to ensure that the traffic is load balanced evenly. For example, if IP addresses in packets change frequently, use the load balancing mode based on dst-ip, src-ip, or src-dst-ip so that traffic can be properly load balanced among physical links. If MAC addresses in packets change frequently and IP addresses are fixed, use the load balancing mode based on dst-mac, src-mac, or src-dst-mac so that traffic can be properly load balanced among physical links. This post was last edited by No.9527 at 2018-10-31 06:40.
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w1
Created Oct 15, 2018 06:23:54 Helpful(0) Helpful(0)

it is very useful case for troubleshooting the eth-trunk issue. for the eth-trunk port's bandwidth usage, the load-balance performance is very important
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Torrent
Created Oct 15, 2018 06:30:39 Helpful(0) Helpful(0)

Checking the configuration of the eth-trunk interface, it configured with mode lacp.Checking the utilization of all interface, and found that most of traffic is coming from slot0, and a party of tarffic is coming from slot1, and only a litte traffic is coming from slot2.Due to on a network where a stack and an Eth-Trunk are used, it is default configuring the Eth-Trunk to preferentially forward local traffic increases bandwidth use efficiency between devices in the stack and improves traffic forwarding efficiency.It indicates that the most of traffic is coming from slot0 and will be forwarding to G0/0/1 due to local preference forwarding.So there are two ways solve this issue:1. disable the function of local preference forwarding function on this eth-trunk interface;interface eth-trunk 1undo local-preference enable2. change all the member of eth-trunk interfaces to one slot.

thanks for sharing!!!!
This post was last edited by Torrent at 2018-10-31 07:33.
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littlestone
Created Oct 15, 2018 06:33:51 Helpful(0) Helpful(0)

useful case for troubleshooting the eth-trunk issue
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NoOneNoWhere
Admin Created Oct 15, 2018 07:26:35 Helpful(0) Helpful(0)

It is a pretty nice case which shows how to troubleshoot eth-trunk issue on Huawei devices.
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Mark.hu
Created Oct 15, 2018 07:32:15 Helpful(0) Helpful(0)

The FW supports two modes: active/standby backup and load balancing mode. In different modes, the FW is different from the upstream and downstream devices in networking and configuration. However, the dual-machine working mode does not have a separate command to be directly configured, but is determined by multiple configurations such as VRRP configuration or hrp standby-device. To reduce the configuration difficulty, the web interface provides configuration items for dual-machine running mode guidance. The corresponding command is the hrp load balance device command. This post was last edited by Mark.hu at 2018-10-31 06:59.
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yjhd
Created Oct 15, 2018 07:32:58 Helpful(0) Helpful(0)

sorry, i can not see the topology pic, can you share it again? i think it should be very useful. This post was last edited by yjhd at 2018-10-31 09:10.
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GongXiaochuan
Created Oct 15, 2018 08:41:29 Helpful(0) Helpful(0)

with the PIC we can easily to know everything , very good

This post was last edited by GongXiaochuan at 2018-10-30 02:45.
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Good Good Study Day Day Up
lizhi94
Created Oct 15, 2018 08:56:47 Helpful(0) Helpful(0)

The post is useful to me .
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