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Port aggregation is to aggregate multiple physical ports together to form an aggregation group to implement load balancing and redundant backup of links.

The basic configuration of the ports in an aggregation group must be consistent. The basic configuration includes STP, VLAN, port attributes and so forth.

STP configurations include STP enable / disable, STP priority, and STP cost.

VLAN configurations include: the port which is allowed to pass the VLAN, port PVID. The configuration of the port attributes is as follows: port speed, duplex mode (must be full duplex), and link type (that is, trunk, hybrid, and access) should be corresponding.

On the same OLT, if these attributes of a port in an aggregation group are modified, the remaining ports in the same aggregation group are automatically synchronized.

According to different aggregation modes, port aggregation can be classified into static aggregation and dynamic LACP aggregation.

There are three types of LACP protocol models: Static mode (on): Does not run LACP protocol

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Dynamic active mode: In active mode, the port automatically initiates LACP negotiation Dynamic passive mode: In passive mode, a port only responds to LACP negotiation

When docking with another device, static can only dock with static, active can dock with active or passive, passive can only dock with activate.

3.2.2

Configure the Aggregation Group ID

The same port cannot join multiple ch-id at the same time. If a member exists in an aggregation group, you cannot directly delete the aggregation group. You must remove the member from the aggregation group firstly.

You can directly create an aggregation id under global configuration mode or automatically create when adding a port to an aggregation group.

Lacp id Configuration

operation command remark

Enter global

configuration mode configure terminal -

Configure the

aggregation group ID [ no] channel-group ch-id optional

3.2.3

Configure the Aggregation Group

Port aggregation includes static and dynamic. “ON” refers to static aggregation while the “active” or “passive” refers to dynamic aggregation. Dynamic aggregation needs to negotiate with the other side via the lacp protocol while static aggregation does not.

A static aggregation group can have up to eight port members.

A dynamic LACP can contain up to 12 members, 8 of which are in bandl state, and the other four are in the backup state. Only members with bandl status will forward normal traffic. When the members of the bandl state linkdown, the backup member with the highest port priority becomes the bandl state.

operation command remark

Enter the interface

configuration mode interface ethernet port-number -

Add a port to an

aggregation group channel-group ch-id mode {on | active | passive } required Remove the port from the

aggregation group no channel-group ch-id optional

Display the information

of the aggregation group show lacp internal [ ch-id ]

optional Display the neighbor

information of the aggregation group

show lacp neighbor [ ch-id ] optional

3.2.4

Configure the Load Balancing Policy

After the aggregation group takes effect, it will forward the service flow among LACP members according to certain policies. The default load balancing uses the src-mac and it can be modified. There is no command to view the load policy separately. You can find the configuration information via show lacp internal [ch-id].

Configure the load balancing policy

operation command remark

Enter global

configuration mode

configure terminal -

Configure the load balancing policy (all groups)

channel-group load-balance {src-mac | dst-mac | src-dst-mac | src-dst- ip | src-ip | dst-ip }

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balancing policy (one

certain group) src-dst-ip | src-ip | dst-ip } Restore the default load

policy no channel-group load-balance

optional

3.2.5

Configure the System Priority

In dynamic LACP mode, the master OLT and slave OLT are selected according to the system ID. System ID is determined by the system priority and the local MAC address. When select the master OLT and slave OLT, compare the priority firstly, the smaller value wins; the same priority, compared MAC, the smaller MAC value wins.

The default system priority is 32768.

Configure the System Priority

operation command remark

Enter global

configuration mode

configure terminal -

Configure the priority of

the system lacp system-priority value

optional Restore the default

configuration no lacp system-priority

optional Display the system

priority configuration show lacp sys-id optional

3.2.6

Configure the Port Priority

When a dynamic LACP is running, the master OLT selects the logical port according to the port ID which consists of port priority and port number. The logical port in Lacp is used to forward protocol packets, such as stp.

When the master OLT selects the logic port: Compare the priority firstly, the smaller value wins; If the priority is the same, then compare the port number, the smaller value wins. By default, ports priorities are the same, and the value is equal to 128. However, the port priority value can be modified. Moreover, the priority needs to be a multiple of 16, if the input value N is not an integer multiple of 16, it will automatically use the result of N divisible by 16. For example, if you set the port priority as 17, the actual success is issued 17 \ 16 = 1.

The logical port on the OLT does not need to be selected, and directly uses the LACP member port which connected to the master OLT 's logical port.

Configure the Port Priority

operation command remark

Enter interface configuration mode

interface ethernet port-number -

Configure interface

priority lacp port-priority value optional

Restore default priority no lacp port-priority optional

3.2.7

LACP Configuration Example

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sketch map of LACP 2. Configuration steps

#SW1 CONFIGURATION: SW1(config)#channel-group 10

SW1(config)#interface range ethernet 0/1 to ethernet 0/12 SW1(config-if-range)#channel-group 10 mode active # SW2 CONFIGURATION:

SW2(config)#interface range ethernet 0/1 to ethernet 0/12 SW2(config-if-range)#channel-group 2 mode active 3. Result validation

# After the dynamic LACP negotiation succeeds, the information is displayed SW1(config)#show lacp internal

load balance: src-mac

Channel: 10, dynamic channel

Port State A-Key O-Key Priority Logic-port Actor-state e0/1 bndl 11 11 128 1 10111100 e0/2 bndl 11 11 128 1 10111100 e0/3 bndl 11 11 128 1 10111100 e0/4 bndl 11 11 128 1 10111100 e0/5 bndl 11 11 128 1 10111100 e0/6 bndl 11 11 128 1 10111100 e0/7 bndl 11 11 128 1 10111100 e0/8 bndl 11 11 128 1 10111100 e0/9 standby 11 11 128 9 10110000 e0/10 standby 11 11 128 10 10110000 e0/11 standby 11 11 128 11 10110000 e0/12 standby 11 11 128 12 10110000 actor-state: activity/timeout/aggregation/synchronization collecting/distributing/defaulted/expired

3.3 Port Isolation Configuration