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3.10. Configuring Link Aggregation
Overview
Function Introduction
This chapter contains a sample configuration of Link Aggregation Control Protocol (LACP) . LACP is based on the 802.3ad IEEE specification. It allows bundling of several physical interfaces to form a single logical channel providing enhanced performance and redundancy. The aggregated interface is viewed as a single link to each switch. The spanning tree views it as one interface. When there is a failure in one physical interface, the other interfaces stay up and there is no disruption. This implementation supports the aggregation of maximum 16 physical Ethernet links into a single logical channel. LACP enables our device to manage link aggregation group between other devices that conform to the 802.3ad protocol. By using the LACP, the switch learns the identity of partners supporting LACP and the capabilities of each port. It then dynamically groups ports with same properties into a single logical bundle link.
Reference to standard IEEE 802.3ad.
Principle Description
N/A
Configuration
Configure dynamic lacp
The configurations of Switch1 and Switch2 are as below:
step 1 Enter the configure mode
Switch# configure terminal
step 2 Set the global attributes of LACP
Set the dynamic lacp mode of aggregation groups.
Switch1 configuration:
Switch(config)# port-channel 1 lacp-mode dynamic
Switch2 configuration:
Switch(config)# port-channel 1 lacp-mode dynamic
step 3 Enter the interface configure mode and add the interface to the channel group
Switch(config)# interface eth-0-1
Switch(config-if)# no shutdown
Switch(config-if)# channel-group 1 mode active
Switch(config-if)# exit
Switch(config)# interface eth-0-2
Switch(config-if)# channel-group 1 mode active
Switch(config-if)# no shutdown
Switch(config-if)# exit
Switch(config)# interface eth-0-3
Switch(config-if)# channel-group 1 mode active
Switch(config-if)# no shutdown
Switch(config-if)# exit
step 4 Exit the configure mode
Switch(config)# end
step 5 Validation
Use the following command to display the information of the channel-group:
Switch# show channel-group summary
port-channel load-balance hash-arithmetic: xor
port-channel load-balance hash-field-select: macsa
Flags: s - suspend T - standby
D - down/admin down B - in Bundle
R - Layer3 S - Layer2
w - wait U - in use
Mode: SLB - static load balance
DLB - dynamic load balance
SHLB - self-healing load balance
RR - round robin load balance
Aggregator Name Mode Protocol Ports
---------------+----+--------+-----
agg1(SU) SLB LACP(Dynamic) eth-0-1(B) eth-0-2(B) eth-0-3(B)
Use the following command to display the information of the interface agg:
Switch1# show interface agg1
Interface agg1
Interface current state: UP
Hardware is AGGREGATE, address is cce3.33fc.330b (bia cce3.33fc.330b)
Bandwidth 3000000 kbits
Index 1025 , Metric 1 , Encapsulation ARPA
Speed - 1000Mb/s , Duplex - Full , Media type is Aggregation
Link speed type is autonegotiation, Link duplex type is autonegotiation
Input flow-control is off, output flow-control is off
The Maximum Frame Size is 1534 bytes
VRF binding: not bound
Label switching is disabled
No virtual circuit configured
ARP timeout 01:00:00, ARP retry interval 1s
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 2 bits/sec, 0 packets/sec
13 packets input, 1184 bytes
Received 0 unicast, 0 broadcast, 0 multicast
0 runts, 0 giants, 0 input errors, 0 CRC
0 frame, 0 overrun, 0 pause input
0 input packets with dribble condition detected
20 packets output, 2526 bytes
Transmitted 0 unicast, 0 broadcast, 0 multicast
0 underruns, 0 output errors, 0 pause output
Configure channel-group
The configurations of Switch1 and Switch2 are as below:
step 1 Enter the configure mode
Switch# configure terminal
step 2 Set the global attributes of LACP
Set the system priority of this switch. This priority is used for determining the system that is responsible for resolving conflicts in the choice of aggregation groups. A lower numerical value has a higher priority.Set the load balance mode. In this case we choose source MAC address for load balance.
Switch1 configuration:
Switch(config)# lacp system-priority 2000
Switch(config)# hash-field port-channel
Switch(config-hash-field)# l2 macsa
Switch2 configuration:
Switch(config)# lacp system-priority 1000
Switch(config)# hash-field port-channel
Switch(config-hash-field)# l2 macsa
step 3 Enter the interface configure mode and add the interface to the channel group
Switch(config)# interface eth-0-1
Switch(config-if)# no shutdown
Switch(config-if)# channel-group 1 mode active
Switch(config-if)# exit
Switch(config)# interface eth-0-2
Switch(config-if)# channel-group 1 mode active
Switch(config-if)# no shutdown
Switch(config-if)# exit
Switch(config)# interface eth-0-3
Switch(config-if)# channel-group 1 mode active
Switch(config-if)# no shutdown
Switch(config-if)# exit
step 4 Exit the configure mode
Switch(config)# end
step 5 Validation
Use the following command to display the information of the channel-group:
Switch# show channel-group summary
port-channel load-balance hash-arithmetic: xor
port-channel load-balance hash-field-select: macsa
Flags: s - suspend T - standby
D - down/admin down B - in Bundle
R - Layer3 S - Layer2
w - wait U - in use
Mode: SLB - static load balance
DLB - dynamic load balance
SHLB - self-healing load balance
RR - round robin load balance
Aggregator Name Mode Protocol Ports
----------------+---+--------+--------------------------
agg1(SU) SLB LACP eth-0-1(B) eth-0-2(B) eth-0-3(B)
Use the following command to display the information of the interface agg:
Switch1# show interface agg1
Interface agg1
Interface current state: UP
Hardware is AGGREGATE, address is cce3.33fc.330b (bia cce3.33fc.330b)
Bandwidth 3000000 kbits
Index 1025 , Metric 1 , Encapsulation ARPA
Speed - 1000Mb/s , Duplex - Full , Media type is Aggregation
Link speed type is autonegotiation, Link duplex type is autonegotiation
Input flow-control is off, output flow-control is off
The Maximum Frame Size is 1534 bytes
VRF binding: not bound
Label switching is disabled
No virtual circuit configured
ARP timeout 01:00:00, ARP retry interval 1s
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 2 bits/sec, 0 packets/sec
13 packets input, 1184 bytes
Received 0 unicast, 0 broadcast, 0 multicast
0 runts, 0 giants, 0 input errors, 0 CRC
0 frame, 0 overrun, 0 pause input
0 input packets with dribble condition detected
20 packets output, 2526 bytes
Transmitted 0 unicast, 0 broadcast, 0 multicast
0 underruns, 0 output errors, 0 pause output
Configuring Static-channel-group
The configurations of Switch1 and Switch2 are as below:
step 1 Enter the configure mode
Switch# configure terminal
step 2 Enter the interface configure mode and add the interface to the channel group
Switch(config)# interface eth-0-1
Switch(config-if)# no shutdown
Switch(config-if)# static-channel-group 1
Switch(config-if)# exit
Switch(config)# interface eth-0-2
Switch(config-if)# static-channel-group 1
Switch(config-if)# no shutdown
Switch(config-if)# exit
Switch(config)# interface eth-0-3
Switch(config-if)# static-channel-group 1
Switch(config-if)# no shutdown
Switch(config-if)# exit
step 3 Exit the configure mode
Switch(config)# end
step 4 Validation
Use the following command to display the information of the channel-group:
Switch1# show channel-group summary
port-channel load-balance hash-arithmetic: xor
port-channel load-balance hash-field-select: macsa
Flags: s - suspend T - standby
D - down/admin down B - in Bundle
R - Layer3 S - Layer2
w - wait U - in use
Mode: SLB - static load balance
DLB - dynamic load balance
SHLB - self-healing load balance
RR - round robin load balance
Aggregator Name Mode Protocol Ports
---------------+----+---------+------------------------------
agg1(SU) SLB Static eth-0-1(B) eth-0-2(B) eth-0-3(B)
Use the following command to display the information of the interface agg:
Switch1# show interface agg 1
Interface agg1
Interface current state: UP
Hardware is AGGREGATE, address is cce3.33fc.330b (bia a876.6b2c.9c01)
Bandwidth 3000000 kbits
Index 1025 , Metric 1 , Encapsulation ARPA
Speed - 1000Mb/s , Duplex - Full , Media type is Aggregation
Link speed type is autonegotiation, Link duplex type is autonegotiation
Input flow-control is off, output flow-control is off
The Maximum Frame Size is 1534 bytes
VRF binding: not bound
Label switching is disabled
No virtual circuit configured
ARP timeout 01:00:00, ARP retry interval 1s
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 140 bits/sec, 0 packets/sec
0 packets input, 0 bytes
Received 0 unicast, 0 broadcast, 0 multicast
0 runts, 0 giants, 0 input errors, 0 CRC
0 frame, 0 overrun, 0 pause input
0 input packets with dribble condition detected
1080 packets output, 60614 bytes
Transmitted 0 unicast, 0 broadcast, 0 multicast
0 underruns, 0 output errors, 0 pause output
Application cases
N/A