Detailed explanation of switch link aggregation [Huawei eNSP]

I. Preface

"The main function of link aggregation is to increase link bandwidth and achieve mutual backup of links. Its specific function is to stop sending data packets on one of the member ports when the switch detects a link failure on this port., recalculates the sending port of messages in the remaining links according to the load sharing policy, and acts as the sending port version again after the faulty port recovers."

(1) Manual mode

In manual mode, the establishment of eth relays and the connection of member interfaces are manually configured, and LACP is not used for negotiation between systems.Under normal circumstances, all links are active links.All active links participate in data forwarding and share traffic equally.If one active link fails, the link aggregation group will automatically share traffic evenly among the remaining active links.In manual mode, in order for the link aggregation interface to work normally, it must be ensured that the peer interfaces of all member interfaces in the local link aggregation interface are connected through the same device; there is no message exchange between devices, and only the administrator can manually confirm;Whether the peer interface is working properly can only be judged by the state of the physical layer.

(2) LACP mode

LACP mode is a link aggregation mode using the LACP protocol.Devices interact through Link Aggregation Control Protocol Data Units (lacpdu), and through protocol negotiation ensures that the other end is a member interface of the same device and the same aggregated interface.Lacpdu messages contain system priorities such as device priority, MAC address, interface priority, and interface number.In LACP mode, the number of active interfaces selected by the devices at both ends must be the same, otherwise a link aggregation group cannot be established.At this time, one end can become the active end, and the other end (passive end) can select the active interface according to the active end.

This note records link aggregation, which is relatively simple, with only a few simple commands.
Requirements:

6. Link aggregation needs to be done between the two aggregation switches to increase the bandwidth. Considering the security issues of the Layer 2 network and the occupancy of network resources, it is necessary to implement Layer 2 isolation between different departments.

Manual link aggregation: increase bandwidth, link backup
Guaranteed reliability and increased bandwidth
Note: 1. The interfaces on both ends must be the same
2. No configuration is allowed under the interface

II. Experiment process

We first create two new switches, as shown in the figure below: The link ensures that the ports on both ends are the same.

Enter SLW9:
Create Logical Interface Group

Interface Eth-Trunk 1

Add physical interface g1:

trunkport g0/0/1

Add physical interface g2:

trunkport g0/0/2

Add physical interface g3 port:

trunkport g0/0/3

Check out the eth-trunk interface:

display eth-trunk 1

Enter SLW10:
Repeat the above steps.
Mainly to ensure that the interface corresponds.Configure as follows

View aggregated link bandwidth: 3G

display interface Eth-Trunk 1

PS:

Configuration command shortcut:

interface Eth-Trunk 1trunkport g0/0/1trunkport g0/0/2trunkport g0/0/3

View eth-trunk interface:

display eth-trunk 1

View the aggregated link bandwidth: 3G

display interface Eth-Trunk 1