LACP In Cisco Switch
Active Mode
To configure a port channel group with LACP and trunking with VLAN 2 as the native VLAN on ports Gigabit Ethernet 45-48, you can follow the steps below:
1. Enter global configuration mode by typing the command:
code
configure terminal2. Create a new port channel group by typing the command:
code
interface Port-channel 1Note:
This will create a new port channel interface named Port-channel 1.
3.Add the range of interfaces GigabitEthernet 2/0/45-48 to the new port channel group and configure it to use LACP mode "active" by typing the command:
code
interface range GigabitEthernet 2/0/45-48
channel-group 1``mode activeThis will add the range of interfaces to the new Port-channel 1 interface and configure it to use LACP mode "active".
Set the LACP system priority and port priority for the new Port-channel interface by typing the command:
code
lacp system-priority 65535
lacp port-priority 32768
interface Port-channel 1
lacp mode activeThis will configure the new Port-channel 1 interface to use LACP mode "active" with a system priority of 65535 and a port priority of 32768.
Set the new Port-channel interface to be a trunk with VLAN 2 as the native VLAN by typing the command:
code
interface Port-channel 1
switchport mode trunk
switchport trunk native vlan 2This will configure the new Port-channel 1 interface to be a trunk port with VLAN 2 as the native VLAN.
Save the configuration by typing the command:
code
write memoryThis will save the configuration to the non-volatile memory of the switch, which will ensure that the configuration persists across reboots.
That's it! Your Cisco Catalyst 3650 switch should now have a Port-channel interface named Port-channel 1 with Gigabit Ethernet ports 45-48 configured as a trunk port with VLAN 2 as the native VLAN.
To configure Gigabit Ethernet ports 43-44 on another Port-channel interface with the same configuration as the first Port-channel, you can follow these steps:
Create a new Port-channel interface by typing the command:
code
interface Port-channel 2This will create a new Port-channel interface named Port-channel 2.
Add the range of interfaces GigabitEthernet 2/0/43-44 to the new Port-channel interface by typing the command:
code
interface range GigabitEthernet 2/0/43-44
channel-group 2
mode activeThis will add the range of interfaces to the new Port-channel 2 interface and configure it to use LACP mode "active".
Set the LACP system priority and port priority for the new Port-channel 2 interface by typing the command:
code
lacp system-priority 65535
lacp port-priority 32768
interface Port-channel 2
lacp mode activeThis will configure the new Port-channel 2 interface to use LACP mode "active" with a system priority of 65535 and a port priority of 32768.
Set the new Port-channel 2 interface to be a trunk with VLAN 2 as the native VLAN by typing the command:
code
interface Port-channel 2
switchport mode trunk
switchport trunk native vlan 2This will configure the new Port-channel 2 interface to be a trunk port with VLAN 2 as the native VLAN.
Save the configuration by typing the command:
code
write memoryThis will save the configuration to the non-volatile memory of the switch.
To configure Gigabit Ethernet ports 41-42 on another Port-channel interface with the same configuration as the other two Port-channels, you can follow the same steps as above, but use different Port-channel and interface numbers. For example, to create a new Port-channel 3 interface with Gigabit Ethernet ports 41-42, you would use the following commands:
Create a new Port-channel interface by typing the command:
code
interface Port-channel 3Add the range of interfaces GigabitEthernet 2/0/41-42 to the new Port-channel interface by typing the command:
code
interface range GigabitEthernet 2/0/41-42 channel-group 3 mode activeSet the LACP system priority and port priority for the new Port-channel 3 interface by typing the command:
code
lacp system-priority 65535 lacp port-priority 32768 interface Port-channel 3 lacp mode active
Set the new Port-channel 3 interface to be a trunk with VLAN 2 as the native VLAN by typing the command:
code
interface Port-channel 3 switchport mode trunk switchport trunk native vlan 2
Save the configuration by typing the command
code
write memoryThis will save the configuration to the non-volatile memory of the switch.
By following these steps, you can create multiple Port-channel interfaces with the same configuration on your Cisco Catalyst 3650 switch.
"Passive Mode"
In Link Aggregation Control Protocol (LACP), there are two modes that can be configured on the switch interface: "active" and "passive".
When a switch interface is configured in "active" mode, it initiates the LACP negotiation process by sending LACP packets to the other end of the link. This means that the interface actively participates in the creation of the link aggregation group.
On the other hand, when a switch interface is configured in "passive" mode, it does not initiate the LACP negotiation process. It simply responds to LACP packets sent by the other end of the link. This means that the interface passively participates in the creation of the link aggregation group.
In general, it is recommended to configure all interfaces in the same link aggregation group with the same LACP mode (either active or passive). If you configure one interface in active mode and another interface in passive mode, there may be a delay in the creation of the link aggregation group, as one interface will be waiting for the other to initiate the LACP negotiation process.
In the example I provided earlier, I configured the physical interfaces to use LACP mode "active" using the command channel-group 1 mode active. However, if you want to configure the interfaces to use LACP mode "passive", you can replace "active" with "passive" in the command, like this:
code
interface range GigabitEthernet 2/0/41-44 channel-group 1 mode passiveThis will configure the physical interfaces to use LACP mode "passive" and add them to the Port-channel 1 interface.
LACP IEEE 802.3ad to bundle the four Gigabit Ethernet ports (45-48) together, you will need to create a port channel group and then configure LACP on the port channel interface.
Here are the steps to create a port channel group and enable LACP on the port channel interface:
Enter global configuration mode by typing the command:
code
configure terminal
Create a port channel group by typing the command:
code
interface Port-channel 1
This will create a new port channel interface named Port-channel 1.
Add the Gigabit Ethernet ports to the port channel group by typing the command:
code
interface range GigabitEthernet 45-48
channel-group 1
mode activeThis will add the four Gigabit Ethernet ports to the Port-channel 1 interface and configure them to use LACP mode "active".
Save the configuration by typing the command:
code
write memoryThis will save the configuration to the non-volatile memory of the switch, which will ensure that the configuration persists across reboots.
That's it! Your Cisco Catalyst 3650 switch should now have a new port channel interface with LACP enabled on Gigabit Ethernet ports 45-48.
To create another port channel group for Gigabit Ethernet ports 43-44 with the same configuration as the existing Port-channel 1, you can use the following steps:
Enter global configuration mode by typing the command:
code
configure terminalCreate a new port channel group by typing the command:
code
interface Port-channel 2This will create a new port channel interface named Port-channel 2.
Add Gigabit Ethernet ports 43-44 to the new port channel group and configure them to use LACP mode "active" by typing the command:
code
interface range GigabitEthernet 43-44
channel-group 2
mode activeThis will add Gigabit Ethernet ports 43-44 to the new Port-channel 2 interface and configure them to use LACP mode "active".
Set the LACP system priority and port priority for the new Port-channel interface to the same values as Port-channel 1 by typing the command:
code
lacp system-priority 65535
lacp port-priority 32768
interface Port-channel 2
lacp mode activeThis will configure the new Port-channel 2 interface to use LACP mode "active" with the same system priority and port priority as the existing Port-channel 1 interface.
Set the new Port-channel interface to be a trunk with VLAN 2 as the native VLAN by typing the command:
code
interface Port-channel 2
switchport mode trunk
switchport trunk native vlan 2This will configure the new Port-channel 2 interface to be a trunk port with VLAN 2 as the native VLAN.
Save the configuration by typing the command:
code
write memoryThis will save the configuration to the non-volatile memory of the switch, which will ensure that the configuration persists across reboots.
That's it! Your Cisco Catalyst 3650 switch should now have two Port-channel interfaces: Port-channel 1 with Gigabit Ethernet ports 45-48 and Port-channel 2 with Gigabit Ethernet ports 43-44. Both Port-channel interfaces should have the same LACP configuration and should be configured as trunk ports with VLAN 2 as the native VLAN.
Example Config of a Cisco Catalyst Switch with Link Aggregations:
M4P-SW01-5th-CORE#show running-config
Building configuration...
Current configuration : 10325 bytes
!
! Last configuration change at 21:48:30 UTC Thu Mar 16 2023
!
version 16.3
no service pad
service timestamps debug datetime msec
service timestamps log datetime msec
no platform punt-keepalive disable-kernel-core
!
hostname M4P-SW01-5th-CORE
!
!
vrf definition Mgmt-vrf
!
address-family ipv4
exit-address-family
!
address-family ipv6
exit-address-family
!
!
no aaa new-model
switch 2 provision ws-c3650-48ps
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
license boot level lanbasek9
diagnostic bootup level minimal
spanning-tree mode rapid-pvst
spanning-tree extend system-id
!
!
!
redundancy
mode sso
!
!
!
class-map match-any system-cpp-police-topology-control
description Topology control
class-map match-any system-cpp-police-sw-forward
description Sw forwarding, SGT Cache Full, LOGGING
class-map match-any system-cpp-default
description DHCP snooping, show forward and rest of traffic
class-map match-any system-cpp-police-sys-data
description Learning cache ovfl, Crypto Control, Exception, EGR Exception, NFL SAMPLED DATA, Gold Pkt, RPF Failed
class-map match-any system-cpp-police-punt-webauth
description Punt Webauth
class-map match-any system-cpp-police-forus
description Forus Address resolution and Forus traffic
class-map match-any system-cpp-police-multicast-end-station
description MCAST END STATION
class-map match-any system-cpp-police-multicast
description Transit Traffic and MCAST Data
class-map match-any system-cpp-police-l2-control
description L2 control
class-map match-any system-cpp-police-dot1x-auth
description DOT1X Auth
class-map match-any system-cpp-police-data
description ICMP_GEN and BROADCAST
class-map match-any system-cpp-police-control-low-priority
description ICMP redirect and general punt
class-map match-any system-cpp-police-wireless-priority1
description Wireless priority 1
class-map match-any system-cpp-police-wireless-priority2
description Wireless priority 2
class-map match-any system-cpp-police-wireless-priority3-4-5
description Wireless priority 3,4 and 5
class-map match-any non-client-nrt-class
class-map match-any system-cpp-police-routing-control
description Routing control
class-map match-any system-cpp-police-protocol-snooping
description Protocol snooping
!
policy-map port\_child\_policy
class non-client-nrt-class
bandwidth remaining ratio 10
policy-map system-cpp-policy
class system-cpp-police-data
police rate 200 pps
class system-cpp-police-sys-data
police rate 100 pps
class system-cpp-police-sw-forward
police rate 1000 pps
class system-cpp-police-multicast
police rate 500 pps
class system-cpp-police-multicast-end-station
police rate 2000 pps
class system-cpp-police-punt-webauth
class system-cpp-police-l2-control
class system-cpp-police-routing-control
police rate 1800 pps
class system-cpp-police-control-low-priority
class system-cpp-police-wireless-priority1
class system-cpp-police-wireless-priority2
class system-cpp-police-wireless-priority3-4-5
class system-cpp-police-topology-control
class system-cpp-police-dot1x-auth
class system-cpp-police-protocol-snooping
class system-cpp-police-forus
class system-cpp-default
!
!
!
!
!
!
!
!
!
!
!
!
!
interface Port-channel1
switchport trunk native vlan 5
switchport trunk allowed vlan 2,4,5
switchport mode trunk
lacp max-bundle 4
!
interface Port-channel2
switchport trunk native vlan 5
switchport trunk allowed vlan 2,4,5
switchport mode trunk
lacp max-bundle 2
!
interface Port-channel3
!
interface GigabitEthernet0/0
vrf forwarding Mgmt-vrf
no ip address
negotiation auto
!
interface GigabitEthernet2/0/1
switchport access vlan 2
switchport mode access
!
interface GigabitEthernet2/0/2
switchport access vlan 2
switchport mode access
!
interface GigabitEthernet2/0/3
switchport access vlan 2
switchport mode access
!
interface GigabitEthernet2/0/4
switchport access vlan 2
switchport mode access
!
interface GigabitEthernet2/0/5
switchport access vlan 2
switchport mode access
!
interface GigabitEthernet2/0/6
switchport access vlan 2
switchport mode access
!
interface GigabitEthernet2/0/7
switchport access vlan 2
switchport mode access
!
interface GigabitEthernet2/0/8
switchport access vlan 2
switchport mode access
!
interface GigabitEthernet2/0/9
switchport access vlan 2
switchport mode access
!
interface GigabitEthernet2/0/10
switchport access vlan 2
switchport mode access
!
interface GigabitEthernet2/0/11
switchport access vlan 2
switchport mode access
!
interface GigabitEthernet2/0/12
switchport access vlan 2
switchport mode access
!
interface GigabitEthernet2/0/13
switchport access vlan 2
switchport mode access
!
interface GigabitEthernet2/0/14
switchport access vlan 2
switchport mode access
!
interface GigabitEthernet2/0/15
switchport access vlan 2
switchport mode access
!
interface GigabitEthernet2/0/16
switchport access vlan 2
switchport mode access
!
interface GigabitEthernet2/0/17
switchport access vlan 2
switchport mode access
!
interface GigabitEthernet2/0/18
switchport access vlan 2
switchport mode access
!
interface GigabitEthernet2/0/19
switchport access vlan 2
switchport mode access
!
interface GigabitEthernet2/0/20
switchport access vlan 2
switchport mode access
!
interface GigabitEthernet2/0/21
switchport access vlan 2
switchport mode access
!
interface GigabitEthernet2/0/22
switchport access vlan 2
switchport mode access
!
interface GigabitEthernet2/0/23
switchport access vlan 2
switchport mode access
!
interface GigabitEthernet2/0/24
switchport access vlan 2
switchport mode access
!
interface GigabitEthernet2/0/25
switchport access vlan 2
switchport mode access
!
interface GigabitEthernet2/0/26
switchport access vlan 2
switchport mode access
!
interface GigabitEthernet2/0/27
switchport access vlan 2
switchport mode access
!
interface GigabitEthernet2/0/28
switchport access vlan 2
switchport mode access
!
interface GigabitEthernet2/0/29
switchport access vlan 2
switchport mode access
!
interface GigabitEthernet2/0/30
switchport access vlan 2
switchport mode access
!
interface GigabitEthernet2/0/31
switchport access vlan 2
switchport mode access
!
interface GigabitEthernet2/0/32
switchport access vlan 2
switchport mode access
!
interface GigabitEthernet2/0/33
switchport access vlan 2
switchport mode access
!
interface GigabitEthernet2/0/34
switchport access vlan 2
switchport mode access
!
interface GigabitEthernet2/0/35
switchport access vlan 2
switchport mode access
!
interface GigabitEthernet2/0/36
switchport access vlan 2
switchport mode access
!
interface GigabitEthernet2/0/37
switchport trunk native vlan 5
switchport mode trunk
!
interface GigabitEthernet2/0/38
!
interface GigabitEthernet2/0/39
!
interface GigabitEthernet2/0/40
!
interface GigabitEthernet2/0/41
switchport trunk native vlan 5
switchport trunk allowed vlan 2,4,5
switchport mode trunk
channel-group 3 mode active
!
interface GigabitEthernet2/0/42
switchport trunk native vlan 5
switchport trunk allowed vlan 2,4,5
switchport mode trunk
channel-group 3 mode active
!
interface GigabitEthernet2/0/43
switchport trunk native vlan 5
switchport mode trunk
channel-protocol lacp
channel-group 2 mode active
!
interface GigabitEthernet2/0/44
switchport trunk native vlan 5
switchport mode trunk
channel-protocol lacp
channel-group 2 mode active
!
interface GigabitEthernet2/0/45
switchport trunk native vlan 5
switchport trunk allowed vlan 2,4,5
switchport mode trunk
channel-protocol lacp
channel-group 1 mode active
!
interface GigabitEthernet2/0/46
switchport trunk native vlan 5
switchport trunk allowed vlan 2,4,5
switchport mode trunk
channel-protocol lacp
channel-group 1 mode active
!
interface GigabitEthernet2/0/47
switchport trunk native vlan 5
switchport trunk allowed vlan 2,4,5
switchport mode trunk
channel-protocol lacp
channel-group 1 mode active
!
interface GigabitEthernet2/0/48
switchport trunk native vlan 5
switchport trunk allowed vlan 2,4,5
switchport mode trunk
channel-protocol lacp
channel-group 1 mode active
!
interface GigabitEthernet2/1/1
!
interface GigabitEthernet2/1/2
!
interface GigabitEthernet2/1/3
!
interface GigabitEthernet2/1/4
!
interface Vlan1
no ip address
!
interface Vlan2
ip address dhcp
!
interface Vlan4
ip address dhcp
!
interface Vlan5
ip address dhcp
!
ip forward-protocol nd
ip http server
ip http secure-server
!
ip access-list extended AutoQos-4.0-wlan-Acl-Bulk-Data
permit tcp any any eq 22
permit tcp any any eq 465
permit tcp any any eq 143
permit tcp any any eq 993
permit tcp any any eq 995
permit tcp any any eq 1914
permit tcp any any eq ftp
permit tcp any any eq ftp-data
permit tcp any any eq smtp
permit tcp any any eq pop3
ip access-list extended AutoQos-4.0-wlan-Acl-MultiEnhanced-Conf
permit udp any any range 16384 32767
permit tcp any any range 50000 59999
ip access-list extended AutoQos-4.0-wlan-Acl-Scavanger
permit tcp any any range 2300 2400
permit udp any any range 2300 2400
permit tcp any any range 6881 6999
permit tcp any any range 28800 29100
permit tcp any any eq 1214
permit udp any any eq 1214
permit tcp any any eq 3689
permit udp any any eq 3689
permit tcp any any eq 11999
ip access-list extended AutoQos-4.0-wlan-Acl-Signaling
permit tcp any any range 2000 2002
permit tcp any any range 5060 5061
permit udp any any range 5060 5061
ip access-list extended AutoQos-4.0-wlan-Acl-Transactional-Data
permit tcp any any eq 443
permit tcp any any eq 1521
permit udp any any eq 1521
permit tcp any any eq 1526
permit udp any any eq 1526
permit tcp any any eq 1575
permit udp any any eq 1575
permit tcp any any eq 1630
permit udp any any eq 1630
permit tcp any any eq 1527
permit tcp any any eq 6200
permit tcp any any eq 3389
permit tcp any any eq 5985
permit tcp any any eq 8080
!
!
!
control-plane
service-policy input system-cpp-policy
!
!
vstack
!
line con 0
stopbits 1
line aux 0
stopbits 1
line vty 0 4
login
line vty 5 15
login
!
!
wsma agent exec
!
wsma agent config
!
wsma agent filesys
!
wsma agent notify
!
!
ap dot11 airtime-fairness policy-name Default 0
ap group default-group
ap hyperlocation ble-beacon 0
ap hyperlocation ble-beacon 1
ap hyperlocation ble-beacon 2
ap hyperlocation ble-beacon 3
ap hyperlocation ble-beacon 4
end
M4P-SW01-5th-CORE#
M4P-SW01-5th-CORE#
M4P-SW01-5th-CORE#
M4P-SW01-5th-CORE#
M4P-SW01-5th-CORE#
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