In inter-board link aggregation, one or more ports on two boards are added to
a LAG. Inter-board link aggregation provides protection for boards configured
with aggregated links. In single homing, only one upstream device is available,
without differentiating between primary and slave devices.
Board-level protection must be implemented in the LAG. If one board becomes faulty, services are not interrupted.
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Service Requirements
The bandwidth between the access device(such as Huawei MA5683T) uplink ports and the upper-layer switch (such as S5720-36C-PWR-EI-AC)is required to increase in load sharing mode. In addition, link protection is required. If one link becomes faulty, the upstream bandwidth is decreased, and the Internet access rate is reduced. However, the Internet access service must not be interrupted, and the access rate reduction slightly degrades user experience.Board-level protection must be implemented in the LAG. If one board becomes faulty, services are not interrupted.
Networking
single-homed inter-board link aggregation: Two GIU boards on the access device are used for upstream transmission(such as Huawei OSN3500), and the access device is interconnected with another device. One LAG is configured on the two GIU boards of the access device, and the other LAG is configured on two boards of the interconnected device.Prerequisite
- Interconnected devices, hardware, and ports support LAGs.
- The two aggregated ports do not have a static MAC address. To check whether an aggregated port has a static MAC address, run the display mac-address command.
Data Plan
Table 1 lists data plan for configuring single-homed inter-board link aggregation.| Item | Data | Remarks |
|---|---|---|
| LAG member port |
|
|
| Aggregation type | LACP aggregation | When the access device connects to a device supporting LACP, the LACP aggregation mode is recommended. When the access device connects to a device not supporting LACP, only manual aggregation can be configured. |
| Load sharing type | Load sharing | A LAG works in load sharing mode by default. |
Procedure
- (Mandatory) Create a LAG and select an aggregation type.
Run the link-aggregation command to add multiple uplink
Ethernet ports to the same LAG to protect ports and share load between the
ports. The port with the smallest port ID is the master port.
- (Optional) Add a LAG member port.
Perform this step when the LAG bandwidth or link reliability is required to
improve. To do so, run the link-aggregation add-member command
to add an Ethernet port to a LAG.
NOTE:
When adding a port to or deleting a port from a LAG, if this port has connected to the peer device, run the shutdown(Ethernet) command to deactivate this port or disconnect the optical fiber from this port to prevent a link loop.
- (Optional) Select a load bearing type.
This step is required only when the LAG works in LACP aggregation mode.
Configuring the maximum active links in a LAG implements traffic allocation in load non-sharing mode. For example, M+N links have been configured in a LAG. Then, run the link-aggregation max-link-number command to specify N active links. The remaining M links are standby ones. If an active link is interrupted, a standby link automatically changes to the active one.
- (Optional) Set the system priority and port priority.
This step is required only when the LAG works in LACP aggregation mode.
- LACP system priority: Run the lacp priority system command to set the LACP system priority of the access device.
- LACP port priority: LACP port priority must be used with the maximum number of links. If a port is required preferentially for carrying services, set its priority higher. Run the lacp priority port command to change the link priority so that the standby link and the active link can be switched over.
- (Optional) Select a link revertive mode.
This step is required only when the LAG works in LACP aggregation mode. Run
the lacp preempt command to set whether traffic is switched
back to the original link when the original link recovers.
- (Optional) Query LAG information.
Run the display link-aggregation command to query the LAG
information, including the master port, number of links, aggregation type
(manual or LACP aggregation), and maximum number of links.
Result
The bandwidth between the access device uplink ports and the upper-layer
switch is increased in load sharing mode. In addition, link protection is
implemented. If one board in the LAG becomes faulty, services are not
interrupted.
Example
The following configurations are used as an example to configure
single-homed inter-board link aggregation:
- The access device transmits data upstream using two GIU boards.
- Uplink ports 0/19/0 and 0/20/0 on the active and standby GIU boards, respectively, are added to an inter-board LAG.
- Packets are forwarded to these ports based on source and destination MAC addresses.
- The LAG works in LACP aggregation mode.
huawei(config)#link-aggregation 0/19 0 0/20 0 egress-ingress workmode lacp-static huawei(config)#display link-aggregation all ------------------------------------------------------------------------- Master port Link aggregation mode Port NUM Work mode Max link number ------------------------------------------------------------------------- 0/19/0 egress-ingress 4 lacp-static - ------------------------------------------------------------------------- Total: 1 link aggregation(s)
Configuration File
link-aggregation 0/19 0 0/20 0 egress-ingress workmode lacp-static
More related:
When Service Interruption on 100G and 40G Boards in WDM Products
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