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Configuring IEEE 802.3ad Link Bundling

Table Of Contents

Configuring IEEE 802.3ad Link Bundling

Finding Feature Information

Contents

Prerequisites for Configuring IEEE 802.3ad Link Bundling

Restrictions for Configuring IEEE 802.3ad Link Bundling

Information About Configuring IEEE 802.3ad Link Bundling

Gigabit EtherChannel

Port Channel and LACP-Enabled Interfaces

IEEE 802.3ad Link Bundling

Benefits of IEEE 802.3ad Link Bundling

LACP Enhancements

LACP for Gigabit Interfaces

Features Supported on Gigabit EtherChannel Bundles

LACP for Gigabit Interfaces Configuration Guidelines

How to Configure IEEE 802.3ad Link Bundling

Enabling LACP

Configuring a Port Channel

Examples

Configuring LACP (802.3ad) for Gigabit Interfaces

Examples

Setting LACP System Priority and Port Priority

Examples

Adding and Removing Interfaces from a Bundle

Removing a Channel Group from a Port

Examples

Setting a Minimum Threshold of Active Links

Monitoring LACP Status

Troubleshooting Tips

Displaying Gigabit EtherChannel Information

Configuration Examples for Configuring IEEE 802.3ad Link Bundling

Example: Configuring LACP for Gigabit Interfaces

Example: Associating a Channel Group with a Port Channel

Example: Adding and Removing Interfaces from a Bundle

Example: Monitoring LACP Status

Example: Displaying Port Channel Interface Information

Additional References

Related Documents

Standards

MIBs

RFCs

Technical Assistance

Feature Information for Configuring IEEE 802.3ad Link Bundling


Configuring IEEE 802.3ad Link Bundling


First Published: June 30, 2009
Last Updated: February 11, 2011

This document describes how the IEEE 802.3ad Link Bundling feature leverages the EtherChannel infrastructure within Cisco IOS XE software to manage the bundling of Ethernet links. The supported Ethernet link types for link bundling are Gigabit Ethernet and Ten Gigabit Ethernet.

Finding Feature Information

For the latest feature information and caveats, see the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the "Feature Information for Configuring IEEE 802.3ad Link Bundling" section.

Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not required.

Contents

Prerequisites for Configuring IEEE 802.3ad Link Bundling

Restrictions for Configuring IEEE 802.3ad Link Bundling

Information About Configuring IEEE 802.3ad Link Bundling

How to Configure IEEE 802.3ad Link Bundling

Configuration Examples for Configuring IEEE 802.3ad Link Bundling

Additional References

Feature Information for Configuring IEEE 802.3ad Link Bundling

Prerequisites for Configuring IEEE 802.3ad Link Bundling

Knowledge of how EtherChannels and Link Aggregation Control Protocol (LACP) function in a network

Verification that both ends of the LACP link have the same baseline software version

Restrictions for Configuring IEEE 802.3ad Link Bundling

Maximum of four Ethernet links per bundle configured for LACP are supported.

All links must operate at the same link speed and in full-duplex mode (LACP does not support half-duplex mode).

All links must be configured as either EtherChannel links or LACP links.

Only physical interfaces can form aggregations. Aggregations of VLAN interfaces are not possible nor is an aggregation of aggregations.

If a router is connected to a switch, the bundle terminates on the switch.

An EtherChannel will not form if one of the LAN ports is a Switched Port Analyzer (SPAN) destination port.

All ports in an EtherChannel must use the same EtherChannel protocol.

Maximum of four bundled ports per Ethernet port channel are supported.

Maximum of 64 Ethernet port channels in a chassis are supported.

QinQ subinterfaces are not supported on Ethernet port channels.

Quality of service (QoS) is supported on individual bundled ports and not on Ethernet port channels.

Information About Configuring IEEE 802.3ad Link Bundling

Gigabit EtherChannel

Port Channel and LACP-Enabled Interfaces

IEEE 802.3ad Link Bundling

LACP Enhancements

LACP for Gigabit Interfaces

Gigabit EtherChannel

Gigabit EtherChannel (GEC) is high-performance Ethernet technology that provides Gigabit per second (Gb/s) transmission rates. A Gigabit EtherChannel bundles individual Ethernet links (Gigabit Ethernet or Ten Gigabit Ethernet) into a single logical link that provides the aggregate bandwidth of up to four physical links. All LAN ports in each EtherChannel must be the same speed and all must be configured as either Layer 2 or Layer 3 LAN ports. Inbound broadcast and multicast packets on one link in an EtherChannel are blocked from returning on any other link in the EtherChannel.

When a link within an EtherChannel fails, traffic previously carried over the failed link switches to the remaining links within that EtherChannel. Also when a failure occurs, a trap is sent that identifies the device, the EtherChannel, and the failed link.

Port Channel and LACP-Enabled Interfaces

Each EtherChannel has a numbered port channel interface that must be manually created before interfaces can be added to the channel group. The configuration of a port channel interface affects all LAN ports assigned to that port channel interface.

To change the parameters of all ports in an EtherChannel, change the configuration of the port channel interface; for example, if you want to configure Spanning Tree Protocol or configure a Layer 2 EtherChannel as a trunk. Any configuration or attribute changes you make to the port channel interface are propagated to all interfaces within the same channel group as the port channel; that is, configuration changes are propagated to the physical interfaces that are not part of the port channel but are part of the channel group.

The configuration of a LAN port affects only that LAN port.

IEEE 802.3ad Link Bundling

The IEEE 802.3ad Link Bundling feature provides a method for aggregating multiple Ethernet links into a single logical channel based on the IEEE 802.3ad standard. This feature helps improve the cost effectiveness of a device by increasing cumulative bandwidth without necessarily requiring hardware upgrades. In addition, IEEE 802.3ad Link Bundling provides a capability to dynamically provision, manage, and monitor various aggregated links and enables interoperability between various Cisco devices and devices of third-party vendors.

LACP supports the automatic creation of EtherChannels by exchanging LACP packets between LAN ports. LACP packets are exchanged only between ports in passive and active modes. The protocol "learns" the capabilities of LAN port groups dynamically and informs the other LAN ports. After LACP identifies correctly matched Ethernet links, it facilitates grouping the links into an EtherChannel. Then the EtherChannel is added to the spanning tree as a single bridge port.

Both the passive and active modes allow LACP to negotiate between LAN ports to determine if they can form an EtherChannel, based on criteria such as port speed and trunking state. (Layer 2 EtherChannels also use VLAN numbers.) LAN ports can form an EtherChannel when they are in compatible LACP modes, as in the following examples:

A LAN port in active mode can form an EtherChannel with another LAN port that is in active mode.

A LAN port in active mode can form an EtherChannel with another LAN port in passive mode.

A LAN port in passive mode cannot form an EtherChannel with another LAN port that is also in passive mode because neither port will initiate negotiation.

LACP uses the following parameters:

LACP system priority—You must configure an LACP system priority on each device running LACP. The system priority can be configured automatically or through the command-line interface (CLI). LACP uses the system priority with the device MAC address to form the system ID and also during negotiation with other systems.

LACP port priority—You must configure an LACP port priority on each port configured to use LACP. The port priority can be configured automatically or through the CLI. LACP uses the port priority to decide which ports should be put in standby mode when there is a hardware limitation that prevents all compatible ports from aggregating. LACP also uses the port priority with the port number to form the port identifier.

LACP administrative key—LACP automatically configures an administrative key value on each port configured to use LACP. The administrative key defines the ability of a port to aggregate with other ports. A port's ability to aggregate with other ports is determined by the following:

Port physical characteristics such as data rate, duplex capability, and point-to-point or shared medium

Configuration restrictions that you establish

On ports configured to use LACP, it tries to configure the maximum number of compatible ports in an EtherChannel, up to the maximum allowed by the hardware. To use the hot standby feature in the event a channel port fails, both ends of the LACP bundle must support the lacp max-bundle command.

As a control protocol, LACP uses the Slow Protocol Multicast address of 01-80-C2-00-00-02 to transmit LACP protocol data units (PDUs). Aside from LACP, the Slow Protocol linktype is to be utilized by operations, administration, and maintenance (OAM) packets, too. Subsequently, a subtype field is defined per the IEEE 802.3ad standard [1] (Annex 43B, section 4) differentiating LACP PDUs from OAM PDUs.


Note LACP and Port Aggregation Control Protocol (PAgP) are not compatible. Ports configured for PAgP cannot form port channels on ports configured for LACP, and ports configured for LACP cannot form port channels on ports configured for PAgP.


Benefits of IEEE 802.3ad Link Bundling

Increased network capacity without changing physical connections or upgrading hardware

Cost savings resulting from use of existing hardware and software for additional functions

A standard solution that enables interoperability of network devices

Port redundancy without user intervention when an operational port fails

LACP Enhancements

The following LACP enhancements are supported:

Four member links per LACP bundle.

Stateful switchover (SSO), in service software upgrade (ISSU), Cisco nonstop forwarding (NSF), and nonstop routing (NSR) on Gigabit EtherChannel bundles.

Point-to-Point Protocol over Ethernet (PPPoE) over Ethernet (PPPoEoE), PPPoEoQinQ, and PPPoVLAN sessions are not forced to reestablish when a link switchover occurs. During the switchover, the port channel is maintained in the LINK_UP state, and both the active and standby links assume the same configured elements after the switchover.

Link failover time of 250 milliseconds or less and a maximum link failover time of 2 seconds; port channels remain in the LINK_UP state to eliminate reconvergence by the Spanning-Tree Protocol.

Shutting down a port channel when the number of active links falls below the minimum threshold. In the port channel interface, a configurable option is provided to bring down the port channel interface when the number of active links falls below the minimum threshold. For the port-channel state to be symmetric on both sides of the channel, the peer must also be running LACP and have the same lacp min-bundle command setting.

The IEEE Link Aggregation Group (LAG) MIB.

LACP for Gigabit Interfaces

The LACP (802.3ad) for Gigabit Interfaces feature bundles individual Ethernet links (Gigabit Ethernet or Ten Gigabit Ethernet) into a single logical link that provides the aggregate bandwidth of up to four physical links.

All LAN ports on a port channel must be the same speed and must all be configured as either Layer 2 or Layer 3 LAN ports. If a segment within a port channel fails, traffic previously carried over the failed link switches to the remaining segments within the port channel. Inbound broadcast and multicast packets on one segment in a port channel are blocked from returning on any other segment of the port channel.


Note The network device to which a Cisco ASR 1000 series router is connected may impose its own limits on the number of bundled ports per port channel.


Features Supported on Gigabit EtherChannel Bundles

Table 1 lists the features that are supported on Gigabit EtherChannel bundles on a Cisco ASR1000 series router.

Table 1 Gigabit EtherChannel Bundle Features 

Cisco IOS XE Release
Feature
Bundle Interface

2.5

Access control lists (ACLs) per bundle

Supported

All Ethernet routing protocols

Supported

Intelligent Service Gateway (ISG) IP sessions

Not Supported

Interface statistics

Supported

IP switching

Supported

IPv4: unicast and multicast

Supported

IPv6: unicast without load balancing across member links

Supported

IPv6: multicast

Not Supported

Layer 2 Tunneling Protocol (L2TP), Generic Routing Encapsulation (GRE), IPinIP, Any Transport Over Multiprotocol Label Switching (MPLS) (AToM) tunnels

Supported

 

MPLS (6PE)

Supported

Multicast VPN

Not Supported

Policy Based Routing (PBR)

Not Supported

PPPoX (PPPoEoE, PPPoEoQinQ, PPPoVLAN)

Not Supported

VLANs

Supported

2.6

Virtual Private Network (VPN) VPN Routing and Forwarding (VRF)

Supported


LACP for Gigabit Interfaces Configuration Guidelines

Port channel interfaces that are configured improperly with LACP are disabled automatically to avoid network loops and other problems. To avoid configuration problems, observe these guidelines and restrictions:

Every port added to a port channel must be configured identically. No individual differences in configuration are allowed.

Bundled ports can be configured on different line cards in a chassis.

Maximum transmission units (MTUs) must be configured on only port channel interfaces; MTUs are propagated to the bundled ports.

QoS and committed access rate (CAR) are applied at the port level. Access control lists (ACLs) are applied on port channels.

MAC configuration is allowed only on port channels.

MPLS IP should be enabled on bundled ports using the mpls ip command.

Unicast Reverse Path Forwarding (uRPF) should be applied on the port channel interface using the ip verify unicast reverse-path command in interface configuration mode.

Cisco Discovery Protocol should be enabled on the port channel interface using the cdp enable command in interface configuration mode.

All LAN ports in a port channel should be enabled. If you shut down a LAN port in a port channel, the shutdown is treated as a link failure and the traffic is transferred to one of the remaining ports in the port channel.

Create a port channel interface using the interface port-channel command in global configuration mode.

When an Ethernet interface has an IP address assigned, disable that IP address before adding the interface to the port channel. To disable an existing IP address, use the no ip address command in interface configuration mode.

The hold queue in command is valid only on port channel interfaces. The hold queue out command is valid only on bundled ports.

How to Configure IEEE 802.3ad Link Bundling

Enabling LACP

Configuring a Port Channel

Configuring LACP (802.3ad) for Gigabit Interfaces

Setting LACP System Priority and Port Priority

Adding and Removing Interfaces from a Bundle

Removing a Channel Group from a Port

Setting a Minimum Threshold of Active Links

Monitoring LACP Status

Displaying Gigabit EtherChannel Information

Enabling LACP

Perform this task to enable LACP.

SUMMARY STEPS

1. enable

2. configure terminal

3. interface port-channel channel-number

4. channel-group channel-group-number mode {active | passive}

5. end

DETAILED STEPS

 
Command or Action
Purpose

Step 1 

enable

Example:

Router> enable

Enables privileged EXEC mode.

Enter your password if prompted.

Step 2 

configure terminal

Example:

Router# configure terminal

Enters global configuration mode.

Step 3 

interface port-channel channel-number

Example:

Router(config)# interface port-channel 10

Identifies the interface port channel and places the command-line interface (CLI) in interface configuration mode.

Step 4 

channel-group channel-group-number mode {active  | passive}

Example:

Router(config-if)# channel-group 25 mode active

Configures the interface in a channel group and sets it as active.

In active mode, the port will initiate negotiations with other ports by sending LACP packets.

Step 5 

end

Example:

Router(config-if)# end

Returns the CLI to privileged EXEC mode.

Configuring a Port Channel

You must manually create a port channel logical interface. Perform this task to configure a port channel.

SUMMARY STEPS

1. enable

2. configure terminal

3. interface port-channel channel-number

4. lacp max-bundle max-bundles

5. ip address ip_address mask

6. end

7. show running-config interface port-channel group_number

8. end

DETAILED STEPS

 
Command or Action
Purpose

Step 1 

enable

Example:

Router> enable

Enables privileged EXEC mode.

Enter your password if prompted.

Step 2 

configure terminal

Example:

Router# configure terminal

Enters global configuration mode.

Step 3 

interface port-channel channel-number

Example:

Router(config)# interface port-channel 10

Identifies the interface port channel and places the CLI in interface configuration mode.

Step 4 

lacp max-bundle max-bundles

Example:

Router(config-if)# lacp max-bundle 3

Configures three active links on the port channel. The remaining links are in standby mode. Traffic is load balanced among the active links.

Step 5 

ip address ip_address mask

Example:

Router(config-if)# ip address 172.31.52.10 255.255.255.0

Assigns an IP address and subnet mask to the EtherChannel.

Step 6 

end

Example:

Router(config-if)# end

Returns the CLI to privileged EXEC mode.

Step 7 

show running-config interface port-channel group_number

Example:

Router# show running-config interface port-channel 10

Displays the port channel configuration.

Step 8 

end

Example:

Router# end

Ends the current configuration session.

Examples

This example shows how to verify the configuration:

Router# show running-config interface port-channel 10 

Building configuration...
Current configuration:
!
interface Port-channel10
 ip address 172.31.52.10 255.255.255.0
 no ip directed-broadcast
end

Configuring LACP (802.3ad) for Gigabit Interfaces

Perform this task to create a port channel with two bundled ports. You can configure a maximum of four bundled ports per port channel.

SUMMARY STEPS

1. enable

2. configure terminal

3. interface port-channel number

4. ip address ip_address mask

5. interface type slot/subslot/port

6. no ip address

7. channel-group channel-group-number mode {active | passive}

8. exit

9. interface type slot/subslot/port

10. no ip address

11. channel-group number mode {active | passive}

12. end

DETAILED STEPS

 
Command or Action
Purpose

Step 1 

enable

Example:

Router> enable

Enables privileged EXEC mode.

Enter your password if prompted.

Step 2 

configure terminal

Example:

Router# configure terminal

Enters global configuration mode.

Step 3 

interface port-channel number

Example:

Router(config)# interface port-channel 1

Specifies the port channel interface and places the CLI in interface configuration mode.

number—Valid range is from 1 to 64.

Step 4 

ip address ip_address mask

Example:

Router(config-if)# ip address 10.1.1.1 255.255.255.0

Assigns an IP address and subnet mask to the port channel interface.

Step 5 

interface type slot/subslot/port

Example:

Router(config-if)# interface gigabitethernet 2/0/0

Specifies the port to bundle.

Step 6 

no ip address

Example:

Router(config-if)# no ip address

Disables the IP address on the port channel interface.

Step 7 

channel-group channel-group-number mode {active | passive}

Example:

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

Assigns the interface to a port channel group and sets the LACP mode.

channel-group-number—Valid range is 1 to 64.

active—Places a port into an active negotiating state, in which the port initiates negotiations with other ports by sending LACP packets.

passive—Places a port into a passive negotiating state, in which the port responds to LACP packets it receives but does not initiate LACP negotiation. In this mode, the channel group attaches the interface to the bundle.

Step 8 

exit

Example:

Router(config-if)# exit

Returns the CLI to global configuration mode.

Step 9 

interface type slot/subslot/port

Example:

Router(config)# interface gigabitethernet 4/0/0

Specifies the next port to bundle and places the CLI in interface configuration mode.

Step 10 

no ip address

Example:

Router(config-if)# no ip address

Disables the IP address on the port channel interface.

Step 11 

channel-group channel-group-number mode {active  | passive}

Example:

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

Assigns the interface to the previously configured port channel group.

channel-group-number—Valid range is 1 to 64.

active—Places a port into an active negotiating state, in which the port initiates negotiations with other ports by sending LACP packets.

passive—Places a port into a passive negotiating state, in which the port responds to LACP packets it receives but does not initiate LACP negotiation. In this mode, the channel-group attaches the interface to the bundle.

Step 12 

end

Example:

Router(config-if)# end

Returns the CLI to privileged EXEC mode.

Examples

Router> enable 
Router# configure terminal
Router(config)# interface port-channel 1
Router(config-if)# ip address 10.1.1.1 255.255.255.0
Router(config-if)# interface gigabitethernet 2/0/0 
Router(config-if)# no ip address
Router(config-if)# channel-group 1 mode active 
Router(config-if)# exit
Router(config)# interface gigabitethernet 4/0/0 
Router(config-if)# no ip address
Router(config-if)# channel-group 1 mode active 
Router(config-if)# end 

Setting LACP System Priority and Port Priority

Perform this task to set the LACP system priority and port priority. The system ID is the combination of the LACP system priority and the MAC address of a device. The port identifier is the combination of the port priority and port number.

SUMMARY STEPS

1. enable

2. configure terminal

3. lacp system-priority priority

4. interface type slot/subslot/port

5. lacp port-priority priority

6. end

7. show lacp sys-id

8. end

DETAILED STEPS

 
Command or Action
Purpose

Step 1 

enable

Example:

Router> enable

Enables privileged EXEC mode.

Enter your password if prompted.

Step 2 

configure terminal

Example:

Router# configure terminal

Enters global configuration mode.

Step 3 

lacp system-priority priority

Example:

Router(config)# lacp system-priority 200

Sets the system priority.

Step 4 

interface type slot/subslot/port

Example:

Router(config)# interface gigabitethernet 0/1/1

Specifies the bundled port on which to set the LACP port priority and places the CLI in interface configuration mode.

Step 5 

lacp port-priority priority

Example:

Router(config-if)# lacp port-priority 500

Specifies the priority for the physical interface.

priority—Valid range is from 1 to 65535. The higher the number, the lower the priority.

Step 6 

end

Example:

Router(config-if)# end

Returns the CLI to privileged EXEC mode.

Step 7 

show lacp sys-id

Example:

Router# show lacp 200

Displays the system ID (a combination of the system priority and the MAC address of the device).

Step 8 

end

Example:

Router# end

Ends the current configuration session.

Examples

Router> enable 
Router# configure terminal
Router(config)# lacp system-priority 200
Router(config)# interface gigabitethernet 0/1/1
Router(config-if)# lacp port-priority 500
Router(config-if)# end

This example shows how to verify the LACP configuration:

Router# show lacp 200

200.abcd.abcd.abcd.

Adding and Removing Interfaces from a Bundle

Perform this task to add and remove an interface from a link bundle.

SUMMARY STEPS

1. enable

2. configure terminal

3. interface type slot/subslot/port

4. channel-group channel-group-number mode {active | passive}

5. no channel-group channel-group-number mode {active | passive}

6. end

DETAILED STEPS

 
Command or Action
Purpose

Step 1 

enable

Example:

Router> enable

Enables privileged EXEC mode.

Enter your password if prompted.

Step 2 

configure terminal

Example:

Router# configure terminal

Enters global configuration mode.

Step 3 

interface type slot/subslot/port

Example:

Router(config)# interface gigabitethernet 5/0/0

Configures a Gigabit Ethernet interface.

Step 4 

channel-group channel-group-number mode  {active | passive}

Example:
Router(config-if)# channel-group 5 mode active

Adds an interface to a channel group and places the CLI in interface configuration mode.

In this instance, the interface from step 3 is added.

Step 5 

no channel-group channel-group-number mode {active | passive}

Example:

Router(config-if)# no channel-group 5 mode active

Removes the Gigabit Ethernet interface from channel group.

Step 6 

end

Example:

Router(config-if)# end

Returns the CLI to privileged EXEC mode.

Removing a Channel Group from a Port

Perform this task to remove a Gigabit Ethernet port channel group from a physical port.

SUMMARY STEPS

1. enable

2. configure terminal

3. no interface port-channel number

4. end

DETAILED STEPS

 
Command or Action
Purpose

Step 1 

enable

Example:

Router> enable

Enables privileged EXEC mode.

Enter your password if prompted.

Step 2 

configure terminal

Example:

Router# configure terminal

Enters global configuration mode.

Step 3 

no interface port-channel number

Example:

Router(config)# no interface port-channel 1

Removes the specified port channel group from a physical port.

number—Valid range is from 1 to 16.

Step 4 

end

Example:

Router(config)# end

Returns the CLI to privileged EXEC mode.

Examples

Router> enable 
Router# configure terminal
Router(config)# no interface port-channel 1
Router(config)# end 

Setting a Minimum Threshold of Active Links

Perform this task to set a minimum number of active links.

SUMMARY STEPS

1. enable

2. configure terminal

3. interface type number

4. lacp min-bundle min-bundle

5. end

DETAILED STEPS

 
Command or Action
Purpose

Step 1 

enable

Example:

Router> enable

Enables privileged EXEC mode.

Enter your password if prompted.

Step 2 

configure terminal

Example:

Router# configure terminal

Enters global configuration mode.

Step 3 

interface type number

Example:

Router(config)# interface port-channel 1

Creates a port-channel virtual interface and places the CLI in interface configuration mode.

Step 4 

lacp min-bundle min-bundle

Example:

Router(config-if)# lacp min-bundle 4

Sets the minimum threshold of active links to 4.

Step 5 

end

Example:

Router(config-if)# end

Returns the CLI to privileged EXEC mode.

Monitoring LACP Status

Perform this task to monitor LACP activity in the network.

SUMMARY STEPS

1. enable

2. show lacp {number | counters | internal | neighbor | sys-id}

3. end

DETAILED STEPS

 
Command or Action
Purpose

Step 1 

enable

Example:

Router> enable

Enables privileged EXEC mode.

Enter your password if prompted.

Step 2 

show lacp {number | counters | internal | neighbor | sys-id}

Example:

Router# show lacp internal

Displays internal device information.

Step 3 

end

Example:

Router# end

Ends the current configuration session.

Troubleshooting Tips

Use the debug lacp command to display LACP configuration and activity details.

The following sample output from a debug lacp all command shows that a remote device is removing a link and also adding a link.

The following sample output shows a remote device removing a link:

Router1# debug lacp all

Link Aggregation Control Protocol all debugging is on

Router1#

*Aug 20 17:21:51.685: LACP :lacp_bugpak: Receive LACP-PDU packet via Gi5/0/0
*Aug 20 17:21:51.685: LACP : packet size: 124
*Aug 20 17:21:51.685: LACP: pdu: subtype: 1, version: 1
*Aug 20 17:21:51.685: LACP: Act: tlv:1, tlv-len:20, key:0x1, p-pri:0x8000, p:0x14, 
p-state:0x3C,
s-pri:0xFFFF, s-mac:0011.2026.7300
*Aug 20 17:21:51.685: LACP: Part: tlv:2, tlv-len:20, key:0x5, p-pri:0x8000, p:0x42, 
p-state:0x3D,
s-pri:0x8000, s-mac:0014.a93d.4a00
*Aug 20 17:21:51.685: LACP: col-tlv:3, col-tlv-len:16, col-max-d:0x8000 
*Aug 20 17:21:51.685: LACP: term-tlv:0 termr-tlv-len:0
*Aug 20 17:21:51.685: LACP: Gi5/0/0 LACP packet received, processing 
*Aug 20 17:21:51.685:     lacp_rx Gi5: during state CURRENT, got event 5(recv_lacpdu)
*Aug 20 17:21:59.869: LACP: lacp_p(Gi5/0/0) timer stopped
*Aug 20 17:21:59.869: LACP: lacp_p(Gi5/0/0) expired
*Aug 20 17:21:59.869:     lacp_ptx Gi5: during state SLOW_PERIODIC, got event 
3(pt_expired)
*Aug 20 17:21:59.869: @@@ lacp_ptx Gi5: SLOW_PERIODIC -> PERIODIC_TX
*Aug 20 17:21:59.869: LACP: Gi5/0/0 lacp_action_ptx_slow_periodic_exit entered
*Aug 20 17:21:59.869: LACP: lacp_p(Gi5/0/0) timer stopped
*Aug 20 17:22:00.869: LACP: lacp_t(Gi5/0/0) timer stopped
*Aug 20 17:22:00.869: LACP: lacp_t(Gi5/0/0) expired
*Aug 20 17:22:19.089: LACP :lacp_bugpak: Receive LACP-PDU packet via Gi5/0/0
*Aug 20 17:22:19.089: LACP : packet size: 124
*Aug 20 17:22:19.089: LACP: pdu: subtype: 1, version: 1
*Aug 20 17:22:19.089: LACP: Act: tlv:1, tlv-len:20, key:0x1, p-pri:0x8000, p:0x14, 
p-state:0x4,
s-pri:0xFFFF, s-mac:0011.2026.7300
*Aug 20 17:22:19.089: LACP: Part: tlv:2, tlv-len:20, key:0x5, p-pri:0x8000, p:0x42, 
p-state:0x34,
s-pri:0x8000, s-mac:0014.a93d.4a00
*Aug 20 17:22:19.089: LACP: col-tlv:3, col-tlv-len:16, col-max-d:0x8000 
*Aug 20 17:22:19.089: LACP: term-tlv:0 termr-tlv-len:0
*Aug 20 17:22:19.089: LACP: Gi5/0/0 LACP packet received, processing 
*Aug 20 17:22:19.089:     lacp_rx Gi5: during state CURRENT, got event 5(recv_lacpdu)
*Aug 20 17:22:19.989: LACP: lacp_t(Gi5/0/0) timer stopped
*Aug 20 17:22:19.989: LACP: lacp_t(Gi5/0/0) expired
*Aug 20 17:22:19.989: LACP: timer lacp_t(Gi5/0/0) started with interval 1000.
*Aug 20 17:22:19.989: LACP: lacp_send_lacpdu: (Gi5/0/0) About to send the 110 LACPDU
*Aug 20 17:22:19.989: LACP :lacp_bugpak: Send LACP-PDU packet via Gi5/0/0
*Aug 20 17:22:19.989: LACP : packet size: 124
*Aug 20 17:22:20.957: LACP: lacp_t(Gi5/0/0) timer stopped
*Aug 20 17:22:20.957: LACP: lacp_t(Gi5/0/0) expired
*Aug 20 17:22:21.205: %LINK-3-UPDOWN: Interface GigabitEthernet5/0/0, changed state to 
down
*Aug 20 17:22:21.205: LACP: lacp_hw_off: Gi5/0/0 is going down

*Aug 20 17:22:21.205: LACP: if_down: Gi5/0/0
*Aug 20 17:22:21.205:     lacp_ptx Gi5: during state SLOW_PERIODIC, got event 
0(no_periodic)
*Aug 20 17:22:22.089: %LINEPROTO-5-UPDOWN: Line protocol on Interface Port-channel5, 
changed state to down
*Aug 20 17:22:22.153: %C10K_ALARM-6-INFO: CLEAR CRITICAL GigE 5/0/0 Physical Port Link 
Down 
*Aug 20 17:22:23.413: LACP: Gi5/0/0 oper-key: 0x0
*Aug 20 17:22:23.413: LACP: lacp_hw_on: Gi5/0/0 is coming up

*Aug 20 17:22:23.413:     lacp_ptx Gi5: during state NO_PERIODIC, got event 0(no_periodic)
*Aug 20 17:22:23.413: @@@ lacp_ptx Gi5: NO_PERIODIC -> NO_PERIODIC
*Aug 20 17:22:23.413: LACP: Gi5/0/0 lacp_action_ptx_no_periodic entered
*Aug 20 17:22:23.413: LACP: lacp_p(Gi5/0/0) timer stopped
*Aug 20 17:22:24.153: %LINK-3-UPDOWN: Interface GigabitEthernet5/0/0, changed state to up
*Aug 20 17:22:24.153: LACP: lacp_hw_on: Gi5/0/0 is coming up

*Aug 20 17:22:24.153:     lacp_ptx Gi5: during state FAST_PERIODIC, got event 
0(no_periodic)
*Aug 20 17:22:24.153: @@@ lacp_ptx Gi5: FAST_PERIODIC -> NO_PERIODIC
*Aug 20 17:22:24.153: LACP: Gi5/0/0 lacp_action_ptx_fast_periodic_exit entered
*Aug 20 17:22:24.153: LACP: lacp_p(Gi5/0/0) timer stopped
*Aug 20 17:22:24.153: LACP: 
*Aug 20 17:22:25.021: LACP: lacp_p(Gi5/0/0) timer stopped
*Aug 20 17:22:25.021: LACP: lacp_p(Gi5/0/0) expired
*Aug 20 17:22:25.021:     lacp_ptx Gi5: during state FAST_PERIODIC, got event 
3(pt_expired)
*Aug 20 17:22:25.021: @@@ lacp_ptx Gi5: FAST_PERIODIC -> PERIODIC_TX
*Aug 20 17:22:25.021: LACP: Gi5/0/0 lacp_action_ptx_fast_periodic_exit entered
*Aug 20 17:22:25.021: LACP: lacp_p(Gi5/0/0) timer stopped
*Aug 20 17:22:25.917: LACP: lacp_p(Gi5/0/0) timer stopped
*Aug 20 17:22:25.917: LACP: lacp_p(Gi5/0/0) expired
*Aug 20 17:22:25.917:     lacp_ptx Gi5: during state FAST_PERIODIC, got event 
3(pt_expired)
*Aug 20 17:22:25.917: @@@ lacp_ptx Gi5: FAST_PERIODIC -> PERIODIC_TX
*Aug 20 17:22:25.917: LACP: Gi5/0/0 lacp_action_ptx_fast_periodic_exit entered
*Aug 20 17:22:25.917: LACP: lacp_p(Gi5/0/0) timer stopped
Router1#

The following sample output shows a remote device adding a link:

Router1#

*Aug 20 17:23:54.005: LACP: lacp_t(Gi5/0/0) timer stopped
*Aug 20 17:23:54.005: LACP: lacp_t(Gi5/0/0) expired
*Aug 20 17:23:55.789: %C10K_ALARM-6-INFO: ASSERT CRITICAL GigE 5/0/0 Physical Port Link 
Down 
*Aug 20 17:23:56.497: %C10K_ALARM-6-INFO: CLEAR CRITICAL GigE 5/0/0 Physical Port Link 
Down 
*Aug 20 17:24:19.085: LACP: lacp_p(Gi5/0/0) timer stopped
*Aug 20 17:24:19.085: LACP: lacp_p(Gi5/0/0) expired
*Aug 20 17:24:19.085:     lacp_ptx Gi5: during state SLOW_PERIODIC, got event 
3(pt_expired)
*Aug 20 17:24:19.085: @@@ lacp_ptx Gi5: SLOW_PERIODIC -> PERIODIC_TX
*Aug 20 17:24:19.085: LACP: Gi5/0/0 lacp_action_ptx_slow_periodic_exit entered
*Aug 20 17:24:19.085: LACP: lacp_p(Gi5/0/0) timer stopped
*Aug 20 17:24:19.957: LACP: lacp_t(Gi5/0/0) timer stopped
*Aug 20 17:24:19.957: LACP: lacp_t(Gi5/0/0) expired
*Aug 20 17:24:21.073: LACP :lacp_bugpak: Receive LACP-PDU packet via Gi5/0/0
*Aug 20 17:24:21.073: LACP : packet size: 124
*Aug 20 17:24:21.073: LACP: pdu: subtype: 1, version: 1
*Aug 20 17:24:21.073: LACP: Act: tlv:1, tlv-len:20, key:0x1, p-pri:0x8000, p:0x14, 
p-state:0xC,
s-pri:0xFFFF, s-mac:0011.2026.7300
*Aug 20 17:24:21.073: LACP: Part: tlv:2, tlv-len:20, key:0x0, p-pri:0x8000, p:0x42, 
p-state:0x75,
s-pri:0x8000, s-mac:0014.a93d.4a00
*Aug 20 17:24:21.073: LACP: col-tlv:3, col-tlv-len:16, col-max-d:0x8000 
*Aug 20 17:24:21.073: LACP: term-tlv:0 termr-tlv-len:0
*Aug 20 17:24:21.073: LACP: Gi5/0/0 LACP packet received, processing 
*Aug 20 17:24:21.073:     lacp_rx Gi5: during state DEFAULTED, got event 5(recv_lacpdu)
*Aug 20 17:24:21.929: LACP: lacp_t(Gi5/0/0) timer stopped
*Aug 20 17:24:21.929: LACP: lacp_t(Gi5/0/0) expired
*Aug 20 17:24:21.929: LACP: timer lacp_t(Gi5/0/0) started with interval 1000.
*Aug 20 17:24:21.929: LACP: lacp_send_lacpdu: (Gi5/0/0) About to send the 110 LACPDU
*Aug 20 17:24:21.929: LACP :lacp_bugpak: Send LACP-PDU packet via Gi5/0/0
*Aug 20 17:24:21.929: LACP : packet size: 124
*Aug 20 17:24:22.805: LACP: lacp_t(Gi5/0/0) timer stopped
*Aug 20 17:24:22.805: LACP: lacp_t(Gi5/0/0) expired
*Aug 20 17:24:23.025: LACP: lacp_w(Gi5/0/0) timer stopped
*Aug 20 17:24:23.025: LACP: lacp_w(Gi5/0/0) expired
*Aug 20 17:24:23.025:     lacp_mux Gi5: during state WAITING, got event 4(ready)
*Aug 20 17:24:23.025: @@@ lacp_mux Gi5: WAITING -> ATTACHED
*Aug 20 17:24:23.921: LACP: lacp_t(Gi5/0/0) timer stopped
*Aug 20 17:24:23.921: LACP: lacp_t(Gi5/0/0) expired
*Aug 20 17:24:26.025: %LINEPROTO-5-UPDOWN: Line protocol on Interface Port-channel5, 
changed state to up

Displaying Gigabit EtherChannel Information

To display Gigabit Ethernet port channel information, use the show interfaces port-channel command in user EXEC mode or privileged EXEC mode. The following example shows information about port channels configured on ports 0/2 and 0/3. The default MTU is set to 1500 bytes.

Router# show interfaces port-channel 1 

Port-channel1 is up, line protocol is up  
Hardware is GEChannel, address is 0013.19b3.7748 (bia 0000.0000.0000) 
MTU 1500 bytes, BW 2000000 Kbit, DLY 10 usec,  
reliability 255/255, txload 1/255, rxload 1/255 
Encapsulation ARPA, loopback not set 
Keepalive set (10 sec) 
ARP type: ARPA, ARP Timeout 04:00:00 
No. of active members in this channel: 2  
Member 0 : GigabitEthernet3/0/0 , Full-duplex, 1000Mb/s Member 1 : GigabitEthernet7/1/0 , 
Full-duplex, 1000Mb/s 
Last input 00:00:05, output never, output hang never 
Last clearing of "show interface" counters 00:04:40 
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0 
Interface Port-channel1 queueing strategy: PXF First-In-First-Out 
Output queue 0/8192, 0 drops; input queue 0/75, 0 drops 
5 minute input rate 0 bits/sec, 0 packets/sec 
5 minute output rate 0 bits/sec, 0 packets/sec 
0 packets input, 0 bytes, 0 no buffer 
Received 0 broadcasts (0 IP multicasts) 
0 runts, 0 giants, 0 throttles 
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored 
0 watchdog, 0 multicast, 0 pause input 
3 packets output, 180 bytes, 0 underruns 
0 output errors, 0 collisions, 0 interface resets 
0 babbles, 0 late collision, 0 deferred 
0 lost carrier, 0 no carrier, 0 PAUSE output 
0 output buffer failures, 0 output buffers swapped out

Table 2 describes the significant fields shown in the display.

Table 2 show interfaces port-channel Field Descriptions 

Field
Description

Port-channel1 is up, line protocol is up

Indicates the bundle interface is currently active and can transmit and receive or it has been taken down by an administrator.

Hardware is

Hardware type (Gigabit EtherChannel).

address is

Address being used by the interface.

MTU

Maximum transmission unit of the interface.

BW

Bandwidth of the interface, in kilobits per second.

DLY

Delay of the interface, in microseconds.

reliability

Reliability of the interface as a fraction of 255 (255/255 is 100 percent reliability), calculated as an exponential average over 5 minutes.

tx load
rxload

Transmit and receive load on the interface as a fraction of 255 (255/255 is completely saturated), calculated as an exponential average over 5 minutes. The calculation uses the value from the bandwidth interface configuration command.

Encapsulation

Encapsulation type assigned to the interface.

loopback

Indicates if loopbacks are set.

keepalive

Indicates if keepalives are set.

ARP type

Address Resolution Protocol (ARP) type on the interface.

ARP Timeout

Number of hours, minutes, and seconds an ARP cache entry stays in the cache.

No. of active members in this channel

Number of bundled ports (members) currently active and part of the port channel group.

Member <no.>
Gigabit Ethernet: <no./no./no.>

Number of the bundled port and associated Gigabit Ethernet port channel interface.

Last input

Number of hours, minutes, and seconds since the last packet was successfully received by an interface and processed locally on the router. Useful for knowing when a dead interface failed. This counter is updated only when packets are process-switched, not when packets are fast-switched.

output

Number of hours, minutes, and seconds since the last packet was successfully transmitted by an interface. This counter is updated only when packets are process-switched, not when packets are fast-switched.

output hang

Number of hours, minutes, and seconds since the interface was last reset because of a transmission that took too long. When the number of hours in any of the "last" fields exceeds 24 hours, the number of days and hours is printed. If that field overflows, asterisks are printed.

last clearing

Time at which the counters that measure cumulative statistics (such as number of bytes transmitted and received) shown in this report were last reset to zero. Variables that might affect routing (for example, load and reliability) are not cleared when the counters are cleared.

*** indicates the elapsed time is too long to be displayed.

0:00:00 indicates the counters were cleared more than 231 ms and less than 232 ms ago.

Input queue

Number of packets in the input queue and the maximum size of the queue.

Queueing strategy

First-in, first-out queueing strategy (other queueing strategies you might see are priority-list, custom-list, and weighted fair).

Output queue

Number of packets in the output queue and the maximum size of the queue.

5 minute input rate
5 minute output rate

Average number of bits and packets received or transmitted per second in the last 5 minutes.

packets input

Total number of error-free packets received by the system.

bytes (input)

Total number of bytes, including data and MAC encapsulation, in the error-free packets received by the system.

no buffer

Number of received packets discarded because there was no buffer space in the main system. Broadcast storms on Ethernet lines and bursts of noise on serial lines are often responsible for no input buffer events.

broadcasts

Total number of broadcast or multicast packets received by the interface.

runts

Number of packets that are discarded because they are smaller than the minimum packet size for the medium.

giants

Number of packets that are discarded because they exceed the maximum packet size for the medium.

input errors

Total number of no buffer, runts, giants, cyclic redundancy checks (CRCs), frame, overrun, ignored, and abort counts. Other input-related errors can also increment the count, so that this sum might not balance with the other counts.

CRC

CRC generated by the originating LAN station or far-end device does not match the checksum calculated from the data received. On a LAN, this usually indicates noise or transmission problems on the LAN interface or the LAN bus. A high number of CRCs is usually the result of collisions or a station transmitting bad data. On a serial link, CRCs usually indicate noise, gain hits or other transmission problems on the data link.

frame

Number of packets received incorrectly having a CRC error and a noninteger number of octets. On a serial line, this is usually the result of noise or other transmission problems.

overrun

Number of times the serial receiver hardware was unable to pass received data to a hardware buffer because the input rate exceeded the receiver's capacity for handling the data.

ignored

Number of received packets ignored by the interface because the interface hardware ran low on internal buffers. These buffers are different than the system buffers mentioned previously in the buffer description. Broadcast storms and bursts of noise can cause the ignored count to be incremented.

watchdog

Number of times the watchdog receive timer expired.

multicast

Number of multicast packets received.

packets output

Total number of messages transmitted by the system.

bytes (output)

Total number of bytes, including data and MAC encapsulation, transmitted by the system.

underruns

Number of times that the far-end transmitter has been running faster than the near-end router's receiver can handle.

output errors

Sum of all errors that prevented the final transmission of datagrams out of the interface being examined. Note that this might not balance with the sum of the enumerated output errors, as some datagrams can have more than one error, and others can have errors that do not fall into any of the specifically tabulated categories.

collisions

Number of messages retransmitted because of an Ethernet collision. A packet that collides is counted only once in output packets.

interface resets

Number of times an interface has been completely reset. This can happen if packets queued for transmission were not sent within a certain interval. If the system notices that the carrier detect line of an interface is up but the line protocol is down, the system periodically resets the interface in an effort to restart that interface. Interface resets can also occur when an unrecoverable interface processor error occurred, or when an interface is looped back or shut down.

babbles

The transmit jabber timer expired.

late collision

Number of late collisions. Late collision happens when a collision occurs after transmitting the preamble. The most common cause of late collisions is that your Ethernet cable segments are too long for the speed at which you are transmitting.

deferred

Indicates that the chip had to defer while ready to transmit a frame because the carrier was asserted.

lost carrier

Number of times the carrier was lost during transmission.

no carrier

Number of times the carrier was not present during the transmission.

PAUSE output

Not supported.

output buffer failures

Number of times that a packet was not output from the output hold queue because of a shortage of shared memory.

output buffers swapped out

Number of packets stored in main memory when the output queue is full; swapping buffers to main memory prevents packets from being dropped when output is congested. The number is high when traffic is bursty.


Configuration Examples for Configuring IEEE 802.3ad Link Bundling

Example: Configuring LACP for Gigabit Interfaces

Example: Associating a Channel Group with a Port Channel

Example: Adding and Removing Interfaces from a Bundle

Example: Monitoring LACP Status

Example: Displaying Port Channel Interface Information

Example: Configuring LACP for Gigabit Interfaces

The following example shows how to configure Gigabit Ethernet ports 2/0 and 4/0 into port channel 1 with LACP parameters.

Router> enable 
Router# configure terminal
Router(config)# lacp system-priority 65535
Router(config)# interface port-channel 1
Router(config-if)# lacp max-bundle 1
Router(config-if)# ip address 10.1.1.1 255.255.255.0
Router(config)# interface gigabitethernet 2/0/0
Router(config-if)# no ip address 
Router(config-if)# lacp port-priority 100
Router(config-if)# channel-group 1 mode passive 
Router(config-if)# exit 
Router(config)# interface gigabitethernet 4/0/0 
Router(config-if)# no ip address 
Router(config-if)# lacp port-priority 200
Router(config-if)# channel-group 1 mode passive
Router(config-if)# end 

Example: Associating a Channel Group with a Port Channel

This example shows how to configure channel group number 5 and include it in the channel group.

Router1# configure terminal

Enter configuration commands, one per line.  End with CNTL/Z.

Router1(config)# interface port 5
Router1(config-if)#

*Aug 20 17:06:14.417: %LINEPROTO-5-UPDOWN: Line protocol on Interface Port-channel5, 
changed state to down
*Aug 20 17:06:25.413: %LINK-3-UPDOWN: Interface Port-channel5, changed state to down

Router1(config-if)#
Router1(config-if)# interface gigabitethernet 7/0/0
Router1(config-if)# channel-group 5 mode active
Router1(config-if)#

*Aug 20 17:07:43.713: %LINK-3-UPDOWN: Interface GigabitEthernet7/0/0, changed state to 
down
*Aug 20 17:07:44.713: %LINEPROTO-5-UPDOWN: Line protocol on Interface 
GigabitEthernet7/0/0, changed state to down
*Aug 20 17:07:45.093: %C10K_ALARM-6-INFO: ASSERT CRITICAL GigE 7/0/0 Physical Port Link 
Down 
*Aug 20 17:07:45.093: %C10K_ALARM-6-INFO: CLEAR CRITICAL GigE 7/0/0 Physical Port Link 
Down 
*Aug 20 17:07:47.093: %LINK-3-UPDOWN: Interface GigabitEthernet7/0/0, changed state to up
*Aug 20 17:07:48.093: %LINEPROTO-5-UPDOWN: Line protocol on Interface 
GigabitEthernet7/0/0, changed state to up
*Aug 20 17:07:48.957: GigabitEthernet7/0/0 added as member-1 to port-channel5
 
*Aug 20 17:07:51.957: %LINEPROTO-5-UPDOWN: Line protocol on Interface Port-channel5, 
changed state to up

Router1(config-if)# end
Router1#

*Aug 20 17:08:00.933: %SYS-5-CONFIG_I: Configured from console by console

Router1# 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 5
                            LACP port     Admin     Oper    Port        Port
Port      Flags   State     Priority      Key       Key     Number      State
Gi7/0/0   SA      bndl      32768         0x5       0x5     0x43        0x3D  

Router1# show interface port 5

Port-channel5 is up, line protocol is up 
  Hardware is GEChannel, address is 0014.a93d.4aa8 (bia 0000.0000.0000)
  MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec, 
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  ARP type: ARPA, ARP Timeout 04:00:00
    No. of active members in this channel: 1 
        Member 0 : GigabitEthernet7/0/0 , Full-duplex, 1000Mb/s
  Last input 00:00:05, output never, output hang never
  Last clearing of "show interface" counters never
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Interface Port-channel5 queueing strategy: PXF First-In-First-Out
  Output queue 0/8192, 0 drops; input queue 0/75, 0 drops
  5 minute input rate 0 bits/sec, 0 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
     0 packets input, 0 bytes, 0 no buffer
     Received 0 broadcasts (0 IP multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 0 multicast, 0 pause input
     9 packets output, 924 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier, 0 PAUSE output
     0 output buffer failures, 0 output buffers swapped out
Router1#

Example: Adding and Removing Interfaces from a Bundle

The following example shows how to add an interface to a bundle:

Router1#
Router1# 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 5
                            LACP port     Admin     Oper    Port        Port
Port      Flags   State     Priority      Key       Key     Number      State
Gi7/0/0   SA      bndl      32768         0x5       0x5     0x43        0x3D  

Router1# configure terminal

Enter configuration commands, one per line.  End with CNTL/Z.

Router1(config)# interface gigabitethernet 5/0/0
Router1(config-if)# channel-group 5 mode active
Router1(config-if)#

*Aug 20 17:10:19.057: %LINK-3-UPDOWN: Interface GigabitEthernet5/0/0, changed state to 
down
*Aug 20 17:10:19.469: %C10K_ALARM-6-INFO: ASSERT CRITICAL GigE 5/0/0 Physical Port Link 
Down 
*Aug 20 17:10:19.473: %C10K_ALARM-6-INFO: CLEAR CRITICAL GigE 5/0/0 Physical Port Link 
Down 
*Aug 20 17:10:21.473: %LINK-3-UPDOWN: Interface GigabitEthernet5/0/0, changed state to up
*Aug 20 17:10:21.473: GigabitEthernet7/0/0 taken out of port-channel5

*Aug 20 17:10:23.413: GigabitEthernet5/0/0 added as member-1 to port-channel5
 
*Aug 20 17:10:23.473: %LINK-3-UPDOWN: Interface Port-channel5, changed state to up

Router1(config-if)# end
Router1#

*Aug 20 17:10:27.653: %SYS-5-CONFIG_I: Configured from console by console

*Aug 20 17:11:40.717: GigabitEthernet7/0/0 added as member-2 to port-channel5
 
Router1# 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 5
                            LACP port     Admin     Oper    Port        Port
Port      Flags   State     Priority      Key       Key     Number      State
Gi7/0/0   SA      bndl      32768         0x5       0x5     0x43        0x3D  
Gi5/0/0   SA      bndl      32768         0x5       0x5     0x42        0x3D  

Router1#
Router1# show interface port 5

Port-channel5 is up, line protocol is up 
  Hardware is GEChannel, address is 0014.a93d.4aa8 (bia 0000.0000.0000)
  MTU 1500 bytes, BW 2000000 Kbit, DLY 10 usec, 
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  ARP type: ARPA, ARP Timeout 04:00:00
    No. of active members in this channel: 2 
        Member 0 : GigabitEthernet5/0/0 , Full-duplex, 1000Mb/s  <---- added to port 
channel bundle
        Member 1 : GigabitEthernet7/0/0 , Full-duplex, 1000Mb/s  
  Last input 00:00:00, output never, output hang never
  Last clearing of "show interface" counters never
  Input queue: 0/150/0/0 (size/max/drops/flushes); Total output drops: 0
  Interface Port-channel5 queueing strategy: PXF First-In-First-Out
  Output queue 0/8192, 0 drops; input queue 0/150, 0 drops
  5 minute input rate 0 bits/sec, 0 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
     0 packets input, 0 bytes, 0 no buffer
     Received 0 broadcasts (0 IP multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 0 multicast, 0 pause input
     104 packets output, 8544 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier, 0 PAUSE output
     0 output buffer failures, 0 output buffers swapped out
Router1#

The following example shows how to remove an interface from a bundle:

Router1#
Router1# configure terminal

Enter configuration commands, one per line.  End with CNTL/Z.

Router1(config)# interface gigabitethernet 7/0/0
Router1(config-if)# no channel-group 5 mode active
Router1(config-if)#

*Aug 20 17:15:49.433: GigabitEthernet7/0/0 taken out of port-channel5

*Aug 20 17:15:49.557: %C10K_ALARM-6-INFO: ASSERT CRITICAL GigE 5/0/0 Physical Port Link 
Down 
*Aug 20 17:15:50.161: %C10K_ALARM-6-INFO: CLEAR CRITICAL GigE 5/0/0 Physical Port Link 
Down 
*Aug 20 17:15:51.433: %LINK-3-UPDOWN: Interface GigabitEthernet7/0/0, changed state to 
down
*Aug 20 17:15:52.433: %LINEPROTO-5-UPDOWN: Line protocol on Interface 
GigabitEthernet7/0/0, changed state to down

Router1(config-if)# end
Router1#

*Aug 20 17:15:58.209: %SYS-5-CONFIG_I: Configured from console by console
Router1#
*Aug 20 17:15:59.257: %C10K_ALARM-6-INFO: ASSERT CRITICAL GigE 7/0/0 Physical Port Link 
Down 
*Aug 20 17:15:59.257: %C10K_ALARM-6-INFO: CLEAR CRITICAL GigE 7/0/0 Physical Port Link 
Down   

Router1#

*Aug 20 17:16:01.257: %LINK-3-UPDOWN: Interface GigabitEthernet7/0/0, changed state to up
*Aug 20 17:16:02.257: %LINEPROTO-5-UPDOWN: Line protocol on Interface 
GigabitEthernet7/0/0, changed state to up

Router1# 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 5
                            LACP port     Admin     Oper    Port        Port
Port      Flags   State     Priority      Key       Key     Number      State
Gi5/0/0   SA      bndl      32768         0x5       0x5     0x42        0x3D  
Router1#

Example: Monitoring LACP Status

The following example shows LACP activity that you can monitor by using the show lacp command.

Router1# 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 5
                            LACP port     Admin     Oper    Port        Port
Port      Flags   State     Priority      Key       Key     Number      State
Gi5/0/0   SA      bndl      32768         0x5       0x5     0x42        0x3D  

Router1# show lacp 5 counters

             LACPDUs         Marker      Marker Response    LACPDUs
Port       Sent   Recv     Sent   Recv     Sent   Recv      Pkts Err
---------------------------------------------------------------------
Channel group: 5
Gi5/0/0     21     18       0      0        0      0         0     

Router1# show lacp 5 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 5
                            LACP port     Admin     Oper    Port        Port
Port      Flags   State     Priority      Key       Key     Number      State
Gi5/0/0   SA      bndl      32768         0x5       0x5     0x42        0x3D  

Router1# show lacp 5 neighbor

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 5 neighbors

Partner's information:

          Partner Partner   LACP Partner  Partner   Partner  Partner     Partner
Port      Flags   State     Port Priority Admin Key Oper Key Port Number Port State
Gi5/0/0   SP      32768     0011.2026.7300  11s    0x1     0x14     0x3C  

Router1# show lacp counters

             LACPDUs         Marker      Marker Response    LACPDUs
Port       Sent   Recv     Sent   Recv     Sent   Recv      Pkts Err
---------------------------------------------------------------------
Channel group: 5
Gi5/0/0     23     20       0      0        0      0         0     

Router1# show lacp sys-id

32768,0014.a93d.4a00
Router1#

Example: Displaying Port Channel Interface Information

The following example shows how to display the configuration of port channel interface 1.

Router# show interface port-channel 1

Port-channel1 is up, line protocol is up  
Hardware is GEChannel, address is 0013.19b3.7748 (bia 0000.0000.0000) 
MTU 1500 bytes, BW 2000000 Kbit, DLY 10 usec,  
reliability 255/255, txload 1/255, rxload 1/255 
Encapsulation ARPA, loopback not set 
Keepalive set (10 sec) 
ARP type: ARPA, ARP Timeout 04:00:00 
No. of active members in this channel: 2  
Member 0 : GigabitEthernet3/0/0 , Full-duplex, 1000Mb/s Member 1 : GigabitEthernet7/1/0 , 
Full-duplex, 1000Mb/s 
Last input 00:00:05, output never, output hang never 
Last clearing of "show interface" counters 00:04:40 
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0 
Interface Port-channel1 queueing strategy: PXF First-In-First-Out 
Output queue 0/8192, 0 drops; input queue 0/75, 0 drops 
5 minute input rate 0 bits/sec, 0 packets/sec 
5 minute output rate 0 bits/sec, 0 packets/sec 
0 packets input, 0 bytes, 0 no buffer 
Received 0 broadcasts (0 IP multicasts) 
0 runts, 0 giants, 0 throttles 
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored 
0 watchdog, 0 multicast, 0 pause input 
3 packets output, 180 bytes, 0 underruns 
0 output errors, 0 collisions, 0 interface resets 
0 babbles, 0 late collision, 0 deferred 
0 lost carrier, 0 no carrier, 0 PAUSE output 
0 output buffer failures, 0 output buffers swapped out

Additional References

Related Documents

Related Topic
Document Title

Configuring EtherChannels

"Configuring Layer 3 and Layer 2 EtherChannel" chapter of the Catalyst 6500 Release 12.2SXF Software Configuration Guide

LACP commands

Cisco IOS Carrier Ethernet Command Reference

LACP commands: complete command syntax, command mode, command history, defaults, usage guidelines, and examples

Cisco IOS Network Management Command Reference

Cisco IOS commands: master list of commands with complete command syntax, command mode, command history, defaults, usage guidelines, and examples

Cisco IOS Master Commands List, All Releases


Standards

Standard
Title

IEEE 802.3ad-2000

IEEE 802.3ad-2000 Link Aggregation


MIBs

MIB
MIBs Link

No new or modified MIBs are supported, and support for existing MIBs has not been modified

To locate and download MIBs for selected platforms, Cisco software releases, and feature sets, use Cisco MIB Locator found at the following URL:

http://www.cisco.com/go/mibs


RFCs

RFC
Title

No new or modified RFCs are supported, and support for existing RFCs has not been modified.


Technical Assistance

Description
Link

The Cisco Support and Documentation website provides online resources to download documentation, software, and tools. Use these resources to install and configure the software and to troubleshoot and resolve technical issues with Cisco products and technologies. Access to most tools on the Cisco Support and Documentation website requires a Cisco.com user ID and password.

http://www.cisco.com/cisco/web/support/index.html


Feature Information for Configuring IEEE 802.3ad Link Bundling

Table 3 lists the features in this module and provides links to specific configuration information.

Use Cisco Feature Navigator to find information about platform support and software image support. Cisco Feature Navigator enables you to determine which software images support a specific software release, feature set, or platform. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not required.


Note Table 3 lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.


Table 3 Feature Information for Configuring IEEE 802.3ad Link Bundling 

Feature Name
Releases
Feature Information

EtherChannel Min-Links

Cisco IOS XE Release 2.5

The EtherChannel Min-Links feature allows a port channel to be shut down when the number of active links falls below the minimum threshold. Using the lacp min-bundle command, you can configure the minimum threshold.

The following sections provide information about this feature:

LACP Enhancements

Setting a Minimum Threshold of Active Links

The following commands were introduced or modified: lacp min-bundle.

IEEE 802.3ad Faster Link Switchover Time

Cisco IOS XE Release 2.5

The IEEE 802.3ad Faster Link Switchover Time feature provides a link failover time of 250 milliseconds or less and a maximum link failover time of 2 seconds. Also, port channels remain in the LINK_UP state to eliminate reconvergence by the Spanning-Tree Protocol.

The following sections provide information about this feature:

LACP Enhancements

The following commands were introduced or modified: lacp fast-switchover.

IEEE 802.3ad Link Aggregation (LACP)

Cisco IOS XE Release 2.4

The IEEE 802.3ad Link Aggregation feature provides a method for aggregating multiple Ethernet links into a single logical channel based on the IEEE 802.3ad standard. In addition, this feature provides a capability to dynamically provision, manage, and monitor various aggregated links and enables interoperability between various Cisco devices and devices of third-party vendors.

In Cisco IOS XE Release 2.4, this feature was implemented on the Cisco ASR1000 Series Router.

The following sections provide information about this feature:

IEEE 802.3ad Link Bundling

How to Configure IEEE 802.3ad Link Bundling

Configuration Examples for Configuring IEEE 802.3ad Link Bundling

The following commands were introduced or modified: channel-group (interface), debug lacp, lacp max-bundle, lacp port-priority, lacp system-priority, show lacp.

Link Aggregation Control Protocol (LACP) (802.3ad) for Gigabit Interfaces

Cisco IOS XE Release 2.5

The LACP (802.3ad) for Gigabit Interfaces feature bundles individual Gigabit Ethernet links into a single logical link that provides the aggregate bandwidth of up to four physical links.

The following sections provide information about this feature:

LACP for Gigabit Interfaces

LACP for Gigabit Interfaces Configuration Guidelines

How to Configure IEEE 802.3ad Link Bundling

Configuration Examples for Configuring IEEE 802.3ad Link Bundling

The following commands were introduced or modified: lacp max-bundle.

SSO - LACP

Cisco IOS XE Release 2.5

The SSO - LACP feature supports stateful switchover (SSO), in service software upgrade (ISSU), Cisco nonstop forwarding (NSF), and nonstop routing (NSR) on Gigabit EtherChannel bundles.

The following sections provide information about this feature:

LACP Enhancements

This feature uses no new or modified commands.