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Configuring LAG

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CHAPTERS

1. LAG

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This guide applies to:

T1500G-8T v2 or above, T1500G-10PS v2 or above, T1500G-10MPS v2 or above, T1500-28PCT v3 or above, T1600G-18TS v2 or above, T1600G-28TS v3 or above, T1600G-28PS v3 or above, T1600G-52TS v3 or above, T1600G-52PS v3 or above, T1700X-16TS v3 or above, T1700G-28TQ v3 or above, T2500G-10TS v2 or above, T2600G-18TS v2 or above, T2600G-28TS v3 or above, T2600G-28MPS v3 or above, T2600G-28SQ v1 or above, T2600G-52TS v3 or above.

1LAG

1.1Overview

With LAG (Link Aggregation Group) function, you can aggregate multiple physical ports into a logical interface, increasing link bandwidth and providing backup ports to enhance the connection reliability.

1.2Supported Features

You can configure LAG in two ways: static LAG and LACP (Link Aggregation Control Protocol).

Static LAG

The member ports are manually added to the LAG.

LACP

The switch uses LACP to implement dynamic link aggregation and disaggregation by exchanging LACP packets with its peer device. LACP extends the flexibility of the LAG configuration.

2LAG Configuration

To complete LAG configuration, follow these steps:

1)Configure the global load-balancing algorithm.

2)Configure Static LAG or LACP.

Configuration Guidelines

Ensure that both ends of the aggregation link work in the same LAG mode. For example, if the local end works in LACP mode, the peer end should also be set as LACP mode.

Ensure that devices on both ends of the aggregation link use the same number of physical ports with the same speed, duplex, jumbo and flow control mode.

A port cannot be added to more than one LAG at the same time.

LACP does not support half-duplex links.

One static LAG supports up to eight member ports. All the member ports share the bandwidth evenly. If an active link fails, the other active links share the bandwidth evenly.

One LACP LAG supports multiple member ports, but at most eight of them can work simultaneously, and the other member ports are backups. Using LACP protocol, the switches negotiate parameters and determine the working ports. When a working port fails, the backup port with the highest priority will replace the faulty port and start to forward data.

For the functions like IGMP Snooping, 802.1Q VLAN, MAC VLAN, Protocol VLAN, VLAN-VPN, GVRP, Voice VLAN, STP, QoS, DHCP Snooping and Flow Control, the member pot of an LAG follows the configuration of the LAG but not its own. The configurations of the port can take effect only after it leaves the LAG.

The port enabled with Port Security, Port Mirror, MAC Address Filtering or 802.1X cannot be added to an LAG, and the member port of an LAG cannot be enabled with these functions.

2.1Using the GUI

2.1.1Configuring Load-balancing Algorithm

Choose the menu L2 FEATURES >Switching > LAG > LAG Table to load the following page.

Figure 2-1 Global Config

In the Global Config section, select the load-balancing algorithm (Hash Algorithm), then click Apply.

Hash Algorithm

Select the Hash Algorithm, based on which the switch can choose the port to forward the received packets. In this way, different data flows are forwarded on different physical links to implement load balancing. There are six options:

SRC MAC: The computation is based on the source MAC addresses of the packets.

DST MAC: The computation is based on the destination MAC addresses of the packets.

SRC MAC+DST MAC: The computation is based on the source and destination MAC addresses of the packets.

SRC IP: The computation is based on the source IP addresses of the packets.

DST IP: The computation is based on the destination IP addresses of the packets.

SRC IP+DST IP: The computation is based on the source and destination IP addresses of the packets.

Tips:

Load-balancing algorithm is effective only for outgoing traffic. If the data stream is not well shared by each link, you can change the algorithm of the outgoing interface.

Please properly choose the load-balancing algorithm to avoid data stream transferring only on one physical link. For example, Switch A receives packets from several hosts and forwards them to the Server with the fixed MAC address, you can set the algorithm as “SRC MAC” to allow Switch A to determine the forwarding port based on the source MAC addresses of the received packets.

Figure 2-2 Hash Algorithm Configuration

2.1.2Configuring Static LAG or LACP

For one port, you can choose only one LAG mode: Static LAG or LACP. And make sure both ends of a link use the same LAG mode.

Configuring Static LAG

Choose the menu L2 FEATURES > Switching > LAG > Static LAG to load the following page.

Figure 2-3 Static LAG

Follow these steps to configure the static LAG:

1)Select an LAG for configuration.

Group ID

Select an LAG for static LAG configuration.

Description

Displays the LAG mode.

2)Select the member ports for the LAG. It is multi-optional.

3)Click Apply.

Note:

Clearing all member ports will delete the LAG.

Configuring LACP

Choose the menu L2 FEATURES > Switching > LAG > LACP to load the following page.

Figure 2-4 LACP Config

Follow these steps to configure LACP:

1)Specify the system priority for the switch and click Apply.

System Priority

Specify the system priority for the switch. A smaller value means a higher priority.

To keep active ports consistent at both ends, you can set the system priority of one device to be higher than that of the other device. The device with higher priority will determine its active ports, and the other device can select its active ports according to the selection result of the device with higher priority. If the two ends have the same system priority value, the device with a smaller MAC address has the higher priority.

2)Select member ports for the LAG and configure the related parameters. Click Apply.

Group ID

Specify the group ID of the LAG. Note that the group ID of other static LAGs cannot be set as this value.

The valid value of the Group ID is determined by the maximum number of LAGs supported by your switch. For example, if your switch supports up to 14 LAGs, the valid value ranges from 1 to 14.

Port Priority

(0-65535)

Specify the Port Priority. A smaller value means a higher port priority.

The port with higher priority in an LAG will be selected as the working port to forward data, and at most eight ports can work simultaneously. If two ports have the same priority value, the port with a smaller port number has the higher priority.

Mode

Select the LACP mode for the port.

In LACP, the switch uses LACPDU (Link Aggregation Control Protocol Data Unit) to negotiate the parameters with the peer end. In this way, the two ends select active ports and form the aggregation link. The LACP mode determines whether the port will take the initiative to send the LACPDU. There are two modes:

Passive: The port will not send LACPDU before receiving the LACPDU from the peer end.

Active: The port will take the initiative to send LACPDU.

Status

Enable the LACP function of the port. By default, it is disabled.

2.2Using the CLI

2.2.1Configuring Load-balancing Algorithm

Follow these steps to configure the load-balancing algorithm:

Step 1

configure

Enter global configuration mode.

Step 2

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

Select the Hash Algorithm. The switch will choose the ports to transfer the packets based on the Hash Algorithm. In this way, different data flows are forwarded on different physical links to implement load balancing.

src-mac: The computation is based on the source MAC addresses of the packets.

dst-mac: The computation is based on the destination MAC addresses of the packets.

src-dst-mac: The computation is based on the source and destination MAC addresses of the packets.

src-ip: The computation is based on the source IP addresses of the packets.

dst-ip: The computation is based on the destination IP addresses of the packets.

src-dst-ip: The computation is based on the source and destination IP addresses of the packets.

Step 3

show etherchannel load-balance

Verify the configuration of load-balancing algorithm.

Step 4

end

Return to privileged EXEC mode.

Step 5

copy running-config startup-config

Save the settings in the configuration file.

The following example shows how to set the global load-balancing mode as src-dst-mac:

Switch#configure

Switch(config)#port-channel load-balance src-dst-mac

Switch(config)#show etherchannel load-balance

EtherChannel Load-Balancing Configuration: src-dst-mac

EtherChannel Load-Balancing Addresses Used Per-Protocol:

Non-IP: Source XOR Destination MAC address

IPv4: Source XOR Destination MAC address

IPv6: Source XOR Destination MAC address

Switch(config)#end

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Switch#copy running-config startup-config

2.2.2Configuring Static LAG or LACP

You can choose only one LAG mode for a port: Static LAG or LACP. And make sure both ends of a link use the same LAG mode.

Configuring Static LAG

Follow these steps to configure static LAG:

Step 1

configure

Enter global configuration mode.

Step 2

interface {fastEthernet port | range fastEthernet port-list | gigabitEthernet port | range gigabitEthernet port-list | ten-gigabitEthernet port | range ten-gigabitEthernet port-list ]

Enter interface configuration mode.

Step 3

channel-group num mode on

Add the port to a static LAG.

num: The group ID of the LAG.

Step 4

show etherchannel num summary

Verify the configuration of the static LAG.

num: The group ID of the LAG.

Step 5

end

Return to privileged EXEC mode.

Step 6

copy running-config startup-config

Save the settings in the configuration file.

The following example shows how to add ports1/0/5-8 to LAG 2 and set the mode as static LAG:

Switch#configure

Switch(config)#interface range gigabitEthernet 1/0/5-8

Switch(config-if-range)#channel-group 2 mode on

Switch(config-if-range)#show etherchannel 2 summary

Flags: D - down P - bundled in port-channel U - in use

I - stand-alone H - hot-standby(LACP only) s - suspended

R - layer3 S - layer2 f - failed to allocate aggregator

u - unsuitable for bundling w - waiting to be aggregated d - default port

Group Port-channel Protocol Ports

----- --------- ------- -------------------------------

2 Po2(S) - Gi1/0/5(D) Gi1/0/6(D) Gi1/0/7(D) Gi1/0/8(D)

Switch(config-if-range)#end

Switch#copy running-config startup-config

Configuring LACP

Follow these steps to configure LACP:

Step 1

configure

Enter global configuration mode.

Step 2

lacp system-priority pri

Specify the system priority for the switch.

To keep active ports consistent at both ends, you can set the priority of one device to be higher than that of the other device. The device with higher priority will determine its active ports, and the other device can select its active ports according to the selection result of the device with higher priority. If the two ends have the same system priority value, the end with a smaller MAC address has the higher priority.

pri: System priority. The valid values are from 0 to 65535, and the default value is 32768. A smaller value means a higher device priority.

Step 3

interface {fastEthernet port | range fastEthernet port-list | gigabitEthernet port | range gigabitEthernet port-list | ten-gigabitEthernet port | range ten-gigabitEthernet port-list ]

Enter interface configuration mode.

Step 4

channel-group num mode { active | passive }

Add the port to an LAG and set the mode as LACP.

num: The group ID of the LAG.

mode: LAG mode. Here you need to select LACP mode: active or passive.

In LACP, the switch uses LACPDU (Link Aggregation Control Protocol Data Unit) to negotiate the parameters with the peer end. In this way, the two ends select active ports and form the aggregation link. The LACP mode determines whether the port will take the initiative to send the LACPDU.

passive: The port will not send LACPDU before receiving the LACPDU from the peer end.

active: The port will take the initiative to send LACPDU.

Step 5

lacp port-priority pri

Specify the Port Priority. The port with higher priority in an LAG will be selected as the working port. If two ports have the same priority value, the port with a smaller port number has the higher priority.

pri: Port priority. The valid values are from 0 to 65535, and the default value is 32768. A smaller value means a higher port priority.

Step 6

show lacp sys-id

Verify the global system priority.

Step 7

show lacp internal

Verify the LACP configuration of the local switch.

Step 8

end

Return to privileged EXEC mode.

Step 9

copy running-config startup-config

Save the settings in the configuration file.

The following example shows how to specify the system priority of the switch as 2:

Switch#configure

Switch(config)#lacp system-priority 2

Switch(config)#show lacp sys-id

2, 000a.eb13.2397

Switch(config)#end

Switch#copy running-config startup-config

The following example shows how to add ports 1/0/1-4 to LAG 6, set the mode as LACP, and select the LACPDU sending mode as active:

Switch#configure

Switch(config)#interface range gigabitEthernet 1/0/1-4

Switch(config-if-range)#channel-group6 mode active

Switch(config-if-range)#show lacp internal

Flags: S - Device is requesting Slow LACPDUs

F - Device is requesting Fast LACPDUs

A - Device is in active mode

P - Device is in passive mode

Channel group 6

Port Flags State LACP Port Priority Admin Key Oper Key Port Number Port State

Gi1/0/1 SA Up 32768 0x6 0x4b1 0x1 0x7d

Gi1/0/2 SA Down 32768 0x6 0 0x2 0x45

Gi1/0/3 SA Down 32768 0x6 0 0x3 0x45

Gi1/0/4 SA Down 32768 0x6 0 0x4 0x45

Switch(config-if-range)#end

Switch#copy running-config startup-config

3Configuration Examples

3.1Example for Static LAG

3.1.1Network Requirements

As shown below, hosts and servers are connected to switch A and switch B, and heavy traffic is transmitted between the two switches. To achieve high speed and reliability of data transmission, users need to improve the bandwidth and redundancy of the link between the two switches.

Figure 3-1 Network Topology

3.1.2Configuration Scheme

LAG function can bundle multiple physical ports into one logical interface to increase bandwidth and improve reliability. In this case we can configure static LAG to meet the requirement.

The overview of the configuration is as follows:

1)Considering there are multiple devices on each end, configure the load-balancing algorithm as ‘SRC MAC+DST MAC’.

2)Add ports 1/0/1-8 to a static LAG.

Demonstrated with T2600G-28TS, the following sections provide configuration procedure in two ways: using the GUI and using the CLI.

3.1.3Using the GUI

The configurations of switch A and switch B are similar. The following introductions take switch A as an example.

1)Choose the menu L2 FEATURES > Switching > LAG > LAG Table to load the following page. Select the hash algorithm as ‘SRC MAC+DST MAC’.

Figure 3-2 Global Configuration

2)Choose the menu L2 FEATURES > Switching > LAG > Static LAG to load the following page. Select LAG 1 and add ports 1/0/1-8 to LAG 1.

Figure 3-3 System Priority Configuration

3)Click to save the settings.

3.1.4Using the CLI

The configurations of switch A and switch B are similar. The following introductions take switch A as an example.

1)Configure the load-balancing algorithm as “src-dst-mac”.

Switch#configure

Switch(config)#port-channel load-balance src-dst-mac

2)Add ports 1/0/1-8 to static LAG 1.

Switch(config)#interface range gigabitEthernet 1/0/1-8

Switch(config-if-range)#channel-group 1 mode on

Switch(config-if)#end

Switch#copy running-config startup-config

Verify the Configuration

Switch#show etherchannel 1 summary

Flags: D - down P - bundled in port-channel U - in use

I - stand-alone H - hot-standby(LACP only) s - suspended

R - layer3 S - layer2 f - failed to allocate aggregator

u - unsuitable for bundling w - waiting to be aggregated d - default port

Group Port-channel Protocol Ports

----- --------- ------- -------------------------------

1 Po2(S) - Gi1/0/1(D) Gi1/0/2(D) Gi1/0/3(D) Gi1/0/4(D)

Gi1/0/5(D) Gi1/0/6(D) Gi1/0/7(D) Gi1/0/8(D)

3.2Example for LACP

3.2.1Network Requirements

As shown below, hosts and servers are connected to switch A and switch B, and heavy traffic is transmitted between the two switches. To achieve high speed and reliability of data transmission, users need to improve the bandwidth and redundancy of the link between the two switches.

Figure 3-4 Network Topology

3.2.2Configuration Scheme

LAG function can bundle multiple physical ports into one logical interface to increase bandwidth and improve reliability. We can configure LACP to meet the requirement.

The overview of the configuration is as follows:

1)Considering there are multiple devices on each end, configure the load-balancing algorithm as ‘SRC MAC+DST MAC’.

2)Specify the system priority for the switches. Here we choose switch A as the dominate device and specify a higher system priority for it.

3)Add ports 1/0/1-10 to the LAG and set the mode as LACP.

4)Specify a lower port priority for ports 1/0/9-10 to set them as the backup ports. When any of ports 1/0/1-8 is down, the backup ports will automatically be enabled to transmit data.

Demonstrated with T2600G-28TS, the following sections provide configuration procedure in two ways: using the GUI and using the CLI.

3.2.3Using the GUI

The configurations of switch A and switch B are similar. The following introductions take switch A as an example.

1)Choose the menu L2 FEATURES > Switching > LAG > LAG Table to load the following page. Select the hash algorithm as ‘SRC MAC+DST MAC’.

Figure 3-5 Global Configuration

2)Choose the menu L2 FEATURES > Switching > LAG > LACP Config to load the following page. In the Global Config section, specify the system priority of Switch A as 0 and Click Apply. Remember to ensure that the system priority value of Switch B is bigger than 0.

Figure 3-6 System Priority Configuration

3)In the LACP Config section, select ports 1/0/1-10, and respectively set the status, group ID, port priority and mode for each port as follows.

Figure 3-7 LACP Configuration

4)Click to save the settings.

3.2.4Using the CLI

The configurations of switch A and switch B are similar. The following introductions take switch A as an example.

1)Configure the load-balancing algorithm as “src-dst-mac”.

Switch#configure

Switch(config)#port-channel load-balance src-dst-mac

2)Specify the system priority of Switch A as 0. Remember to ensure that the system priority value of Switch B is bigger than 0.

Switch(config)#lacp system-priority 0

3)Add ports 1/0/1-8 to LAG 1 and set the mode as LACP. Then specify the port priority as 0 to make them active.

Switch(config)#interface range gigabitEthernet 1/0/1-8

Switch(config-if-range)#channel-group 1 mode active

Switch(config-if-range)#lacp port-priority 0

Switch(config-if-range)#exit

4)Add port 1/0/9 to LAG 1 and set the mode as LACP. Then specify the port priority as 1 to set it as a backup port. When any of the active ports is down, this port will be preferentially selected to work as an active port.

Switch(config)#interface gigabitEthernet 1/0/9

Switch(config-if)#channel-group 1 mode active

Switch(config-if)#lacp port-priority 1

Switch(config-if)#exit

5)Add port 1/0/10 to LAG 1 and set the mode as LACP. Then specify the port priority as 2 to set it as a backup port. The priority of this port is lower than port 1/0/9.

Switch(config)#interface gigabitEthernet 1/0/10

Switch(config-if)#channel-group 1 mode active

Switch(config-if)#lacp port-priority 2

Switch(config-if)#end

Switch#copy running-config startup-config

Verify the Configuration

Verify the system priority:

Switch#show lacp sys-id

0, 000a.eb13.2397

Verify the LACP configuration:

Switch#show lacp internal

Flags: S - Device is requesting Slow LACPDUs

F - Device is requesting Fast LACPDUs

A - Device is in active mode

P - Device is in passive mode

Channel group 1

Port Flags State LACP Port Priority Admin Key Oper Key Port Number Port State

Gi1/0/1 SA Down 0 0x1 0 0x1 0x45

Gi1/0/2 SA Down 0 0x1 0 0x2 0x45

Gi1/0/3 SA Down 0 0x1 0 0x3 0x45

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Gi1/0/4 SA Down 0 0x1 0 0x4 0x45

Gi1/0/5 SA Down 0 0x1 0 0x5 0x45

Gi1/0/6 SA Down 0 0x1 0 0x6 0x45

Gi1/0/7 SA Down 0 0x1 0 0x7 0x45

Gi1/0/8 SA Down 0 0x1 0 0x8 0x45

Gi1/0/9 SA Down 1 0x1 0 0x9 0x45

Gi1/0/10 SA Down 2 0x1 0 0xa 0x45

4Appendix: Default Parameters

Default settings of Switching are listed in the following tables.

Table 4-1Default Settings of LAG

Parameter

Default Setting

LAG Table

Hash Algorithm

SRC MAC+DST MAC

LACP Config

System Priority

32768

Admin Key

0

Port Priority

32768

Mode

Passive

Status

Disable

Objective

This article explains how Link Aggregation (LAG) load balancing works on Cisco 350 and 550 series switches and how to configure load balancing on your switch.

Introduction

Link Aggregation Control Protocol (LACP) is part of the IEEE specification (802.3az) that enables you to bundle several physical ports together to form a single logical channel called a LAG. LAGs increase bandwidth while maintaining redundancy between two devices.

Traffic forwarded to a LAG is load-balanced across the active member ports, thus achieving an effective bandwidth close to the aggregate bandwidth of all the active member ports of the LAG.

Traffic load balancing over the active member ports of a LAG is managed by a hash-based distribution function that distributes unicast and multicast traffic based on Layer 2 or Layer 3 packet header information.

The device supports two modes of load balancing:

  • By Media Access Control (MAC) Addresses—Based on the destination and source MAC addresses of all packets.
  • By Internet Protocol (IP) and MAC Addresses—Based on the destination and source IP addresses for IP packets, and destination and source MAC addresses for non-IP packets.

Applicable Devices

  • SG350
  • SF350
  • SG350X
  • SG350XG
  • SF550X
  • SG550X
  • SX550X
  • SG550XG

Software Version

  • 2.5.0.83

LAG Management

In general, a LAG is treated by the system as a single logical port. In particular, the LAG has port attributes similar to a regular port, such as state and speed.

The 350 family of devices support up to 8 LAGs. The 550 family of devices support up to 32 LAGs. All devices support up to 8 ports in a LAG group.

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Every LAG has the following characteristics:

  • All ports in a LAG must be of the same media type, such as Ethernet cable connectivity.
  • Ports in a LAG must not be assigned to another LAG.
  • No more than 8 ports are assigned to a static LAG and no more than 16 ports can be candidates for a dynamic LAG.
  • When a port is added to a LAG, the configuration of the LAG is applied to the port. When the port is removed from the LAG, its original configuration is reapplied.
  • Protocols, such as Spanning Tree, consider all the ports in the LAG to be one port.

Topology

Two switches connected via LAG using 2 ports only and load balance algorithm MAC Address vs MAC/IP address. Additionally, 4 clients connected to one switch, 4 servers connected to the second switch.

How LAG Load Balancing Works on Cisco 350 and 550 Series Switches

Please note that Cisco 350 and 550 series switches use the Exclusive OR (XOR) method to choose the interface which is forwarding traffic. These switches provide load balance between LAG ports using XOR on MAC address (destination and source) or combination MAC/IP address (destinations and sources). This means that for specific packets with the same MAC and/or IP addresses, traffic will be sent via one specific port and not two or three at the same time. This implies that one client to server connection would not be able to exceed one port throughput no matter how many ports are in a LAG. It is purely based on header information on the packet. If those remain unchanged, there will not be any difference in the algorithm behavior.

We will compare algorithm mode MAC Address with MAC/IP address. Since we are using 2 ports for LAG we can have only two different results from XOR, either 0 or 1. That means we need to use only last bit of the address for XOR comparison so we could have 0 or 1. If XOR results are 0, the traffic will go via the 1st port of the LAG and if result will be 1 it will go via the 2nd port of the LAG.

  • 0 > Port 1
  • 1 > Port 2

If we use 3 or 4 ports, we could receive a minimum of 3-4 different results of XOR. We would need to use 2 bits for comparison, so we could have 4 different combinations.

  • 00 > Port 1
  • 01 > Port 2
  • 10 > Port 3
  • 11 > Port 4

If we use 5-8 ports, we could receive a minimum of 5-8 different results of XOR and we would need to use 3 bits for comparison so we could have 8 different combinations like 000, 001, 010, 011, 100, 101, 110 and 111. And the mechanism of choosing port would be similar as above but with more options.

  • 000 > Port 1
  • 001 > Port 2
  • 010 > Port 3
  • 011 > Port 4
  • 100 > Port 5
  • 101 > Port 6
  • 110 > Port 7
  • 111 > Port 8

Example of a Two Port LAG with IP/MAC Address Load Balancing

In this example, we focus on 2 ports for the LAG. Therefore, we only have to take the last bit of the binary form of the MAC and IP address into consideration for the XOR operation.

Listed below is a conversion of IP and MAC addresses to binary as well as XOR on those sources and destinations.

Sources:

NameIP addressBinary form of IP (last octet only)MAC address (Last 6 digits only)Binary form of MAC (last digit)XOR output
Client 1192.168.46.10001100100:06:41:430100 00110 XOR 1 = 1
Client 2192.268.46.10101100101:06:41:420100 00101 XOR 0 = 1
Client 3192.168.46.10201100110:06:3e:af1010 11110 XOR 1 = 1
Client 4192.168.46.10301100111:06:3e:ae1010 11101 XOR 0 = 1

Destinations:

NameIP addressBinary form of IP (last octet only)MAC address (Last 6 digits only)Binary form of MAC (last digit)XOR output
Server 1192.168.46.12001111000:06:62:0f0000 11110 XOR 1 = 1
Server 2192.268.46.12101111001:06:62:0e0000 11101 XOR 0 = 1
Server 3192.168.46.12201111010:06:3b:f71111 01110 XOR 1 = 1
Server 4192.168.46.12301111011:06:3b:f61111 01101 XOR 0 = 1

XOR done on all the destination and source MAC and IP addresses gives the same value 1. That would mean that all traffic would utilize only port 2 of the LAG. Port 1 would not be used for connections from any of the clients to any of the servers and it means that MAC/IP Address mode is not optimal.

Example of a Two Port LAG with only MAC Address Load Balancing

Now we will analyze the load balancing based only on the MAC address.

NameMAC address (Last 6 digits only)Binary form of MAC (last digit)Last digit of the binary output
Client 1:06:41:430100 00111
Client 2:06:41:420100 00100
Client 3:06:3e:af1010 11111
Client 4:06:3e:ae1010 11100
NameMAC address (last 6 digits only)Binary form of MAC (last digit)Last digit of the binary output
Server 1:06:62:0f0000 11111
Server 2:06:62:0e0000 11100
Server 3:06:3b:f71111 01111
Server 4:06:3b:f61111 01100

This time XOR done for each MAC address is different.

  • If we take packet from client 1 to server 1, we would do 1 XOR 1 > 0 using port 1.
  • If we take packet from client 1 to server 2, we would do 1 XOR 0 > 1 using port 2.
  • If we take packet from client 2 to server 2, we would do 0 XOR 0 > 0 using port 1.
  • If we take packet from client 2 to server 1, we would do 0 XOR 1 > 1 using port 2.

Now we would achieve optimal load balance and port utilization would be fairly equal.

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Note: While using the IP/MAC Address algorithm, in some cases we may achieve the optimal output by changing the IP address only on the source or destination side as MAC address of the device will remain the same.

Configure LAG Load Balance Algorithm on the Switch

Step 1. Log in to the Cisco switch by entering the Username and Password. Click Log In. By default the username and password are cisco, but since you are working on an existing network, you should have your own username and password. Enter those credentials instead.

Note: By default, the Application window shows the Switch Management option selected, and should be left alone.

Step 2. Navigate to Port Management > LAG Management and select the Load Balance Algorithm option. You can select either MAC Address, or IP/MAC Address. Click Apply.

Note: By default, MAC Address is the option selected for Load Balance Algorithm.

Step 3. Now you will be able to see the Success notification on the screen. Click File Operations to save the configuration on the switch to startup configuration.

Note: Alternatively, you can just click on the icon to save the configuration.

Step 4. The File Operations page will open. Verify that the Source File Name is selected as Running Configuration and Destination File Name is selected as Startup Configuration. Click Apply to save the configuration.

Conclusion

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You now have a better understanding of LAG load balancing and how to configure it on your 350 or 550 series switches. You have also learned that if you select the IP/MAC address load balance, in certain topologies, there is a chance that load balancing may not work effectively.

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