IEEE 802.3ad Link Bundling

Table Of Contents

IEEE 802.3ad Link Bundling

Contents

Prerequisites for IEEE 802.3ad Link Bundling

Restrictions for IEEE 802.3ad Link Bundling

Information About 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

How to Configure IEEE 802.3ad Link Bundling

Enabling LACP

Configuring a Port Channel

Examples

Associating a Channel Group with a Port Channel

Setting LACP System Priority

Examples

Adding and Removing Interfaces from a Bundle

Monitoring LACP Status

Troubleshooting Tips

Configuration Examples for IEEE 802.3ad Link Bundling

Associating a Channel Group with a Port Channel: Example

Adding and Removing Interfaces from a Bundle: Example

Monitoring LACP Status: Example

Additional References

Related Documents

Standards

MIBs

RFCs

Technical Assistance

Command Reference

channel-group (interface)

debug lacp

lacp max-bundle

lacp port-priority

lacp system-priority

show lacp

Feature Information for IEEE 802.3ad Link Bundling

IEEE 802.3ad Link Bundling

First Published: December 4, 2006

Last Updated: February 27, 2007

The IEEE 802.3ad Link Bundling feature provides a method of aggregating multiple Ethernet links into a single logical channel. This feature helps improve the cost effectiveness of a device by increasing cumulative bandwidth without 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.

This document describes how the IEEE 802.3ad Link Bundling feature leverages the EtherChannel infrastructure within Cisco IOS software to manage the bundling of various links.

Finding Feature Information in This Module

Your Cisco IOS software release may not support all of the features documented in this module. To reach links to specific feature documentation in this module and to see a list of the releases in which each feature is supported, use the "Feature Information for IEEE 802.3ad Link Bundling" section.

Finding Support Information for Platforms and Cisco IOS and Catalyst OS Software Images

Use Cisco Feature Navigator to find information about platform support and Cisco IOS and Catalyst OS 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 IEEE 802.3ad Link Bundling

•Restrictions for IEEE 802.3ad Link Bundling

•Information About IEEE 802.3ad Link Bundling

•How to Configure IEEE 802.3ad Link Bundling

•Configuration Examples for IEEE 802.3ad Link Bundling

•Additional References

•Command Reference

•Feature Information for IEEE 802.3ad Link Bundling

Prerequisites for IEEE 802.3ad Link Bundling

•Knowledge of how EtherChannels and LACP function in a network

Restrictions for IEEE 802.3ad Link Bundling

•Number of links supported per bundle is bound by the platform.

•On the Cisco 10000 router, the number of links per bundle is 4.

•On the Cisco 10000 only 1-gigabit-per-second (Gbps) ports are supported for Gigabit EtherChannels (GECs).

•All links must operate at the same link speed and in full-duplex mode (Link Aggregation Control Protocol [LACP] does not support half-duplex mode).

•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.

Information About IEEE 802.3ad Link Bundling

Before you set up IEEE 802.3ad Link Bundling, you should understand the following concepts:

•Gigabit EtherChannel

•Port Channel and LACP-Enabled Interfaces

•IEEE 802.3ad Link Bundling

•Benefits of IEEE 802.3ad Link Bundling

Gigabit EtherChannel

Gigabit EtherChannel is high-performance Ethernet technology that provides Gbps transmission rates. A Gigabit EtherChannel bundles individual Gigabit Ethernet links into a single logical link that provides the aggregate bandwidth of up to eight 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, if not already created, is created automatically when the first physical interface is 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 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. In Cisco IOS Release 12.2(31)SB2 on the Cisco 10000 series router, only 4 ports per bundle can be aggregated and the peer must be configured to support LACP. 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. See the "lacp max-bundle" section for additional details.

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.

Benefits of IEEE 802.3ad Link Bundling

IEEE 802.3ad Link Bundling offers the following benefits:

•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

How to Configure IEEE 802.3ad Link Bundling

Perform the following tasks to configure IEEE 802.3ad Link Bundling:

•Enabling LACP

•Configuring a Port Channel

•Associating a Channel Group with a Port Channel

•Setting LACP System Priority

•Adding and Removing Interfaces from a Bundle

•Monitoring LACP Status

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 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. ip address ip_address mask

5. end

6. show running-config interface port-channel group_number

7. 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

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 5

end
Example:

Router(config-if)# end

Returns the CLI to privileged EXEC mode.

Step 6

show running-config interface port-channel group_number
Example:

Router# show running-config interface port-channel 10

Displays the port channel configuration.

Step 7

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
Associating a Channel Group with a Port Channel

Perform this task to associate a channel group with a port channel.

SUMMARY STEPS

1. enable

2. configure terminal

3. interface port-channel channel-number

4. interface type number

5. 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 port-channel channel-number
Example:

Router(config)# interface port-channel 5

Creates a port channel.

Step 4

interface type number
Example:

Router(config)# interface gigabitethernet 7/0/0

Configures a GigabitEthernet interface and places the CLI in interface configuration mode.

Step 5

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

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

Includes the interface as part of the port channel bundle.

Step 6

end
Example:

Router(config-if)# end

Returns the CLI to privileged EXEC mode.

Setting LACP System Priority

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

SUMMARY STEPS

1. enable

2. configure terminal

3. lacp system-priority priority

4. end

5. show lacp sys-id

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

lacp system-priority priority
Example:

Router(config)# lacp system-priority 200

Sets the system priority.

Step 4

end
Example:

Router(config)# end

Returns the CLI to privileged EXEC mode.

Step 5

show lacp sys-id
Example:

Router# show lacp 200

Displays the system ID, which is a combination of the system priority and the MAC address of the device.

Step 6

end
Example:

Router# end

Ends the current configuration session.

Examples

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 number

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 number
Example:

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

Configures a GigabitEthernet interface.
Step 4
channel-group channel-group-number mode {active | passive}
Example:
Router(config-if)# channel-group 5 mode active
Adds a GigabitEthernet interface to a channel group and places the CLI in interface configuration mode.
Step 5

no channel-group channel-group-number
Example:

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

Removes the GigabitEthernet interface from channel group.

Step 6

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
Configuration Examples for IEEE 802.3ad Link Bundling

This section contains the following configuration examples:

•Associating a Channel Group with a Port Channel: Example

•Adding and Removing Interfaces from a Bundle: Example

•Monitoring LACP Status: Example

Associating a Channel Group with a Port Channel: Example

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#
Adding and Removing Interfaces from a Bundle: Example

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#
Monitoring LACP Status: Example

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#
Additional References

The following sections provide references related to the IEEE 802.3ad Link Bundling feature.

Related Documents

Related Topic

Document Title

Configuring EtherChannels

"Configuring EtherChannels" chapter of the Catalyst 6500 Series Cisco IOS Software Configuration Guide, Release 12.1E

LACP commands

Cisco IOS Network Management Command Reference, Release 12.4T

Standards

Standard

Title

IEEE 802.3ad-2000

IEEE 802.3ad-2000 Link Aggregation

MIBs

MIB

MIBs Link

•CISCO-LAG-MIB

•802.3ad-MIB

To locate and download MIBs for selected platforms, Cisco IOS 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 by this feature, and support for existing RFCs has not been modified by this feature.

—

Technical Assistance

Description

Link

The Cisco Support website provides extensive online resources, including documentation and tools for troubleshooting and resolving technical issues with Cisco products and technologies. Access to most tools on the Cisco Support website requires a Cisco.com user ID and password. If you have a valid service contract but do not have a user ID or password, you can register on Cisco.com.

http://www.cisco.com/techsupport

Command Reference

This section documents only commands that are new or modified.

•channel-group (interface)

•debug lacp

•lacp max-bundle

•lacp port-priority

•lacp system-priority

•show lacp

channel-group (interface)

To assign and configure an EtherChannel interface to an EtherChannel group, use the channel-group command in interface configuration mode. To remove the channel-group configuration from the interface, use the no form of this command.

channel-group channel-group-number mode {active | on | passive}
no channel-group channel-group-number
Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 Series Routers

channel-group channel-group-number mode on
no channel-group channel-group-number
Cisco Catalyst Switches

channel-group channel-group-number mode {active | on | auto [non-silent] | desirable [non-silent] | passive}
no channel-group channel-group-number
Syntax Description

channel-group-number

Integer that identifies the channel-group. Valid values are from 1 to 256; the maximum number of integers that can be used is 64.

For Fast EtherChannel groups, the number is an integer from 1 to 4. This number is the one previously assigned to the port-channel interface.

mode

Specifies the EtherChannel mode of the interface.

active

Enables Link Aggregation Control Protocol (LACP) unconditionally.

on

Enables EtherChannel only.

auto

Places a port into a passive negotiating state in which the port responds to Port Aggregation Protocol (PAgP) packets that it receives but does not initiate PAgP packet negotiation.

non-silent

(Optional) Used with the auto or desirable mode when traffic is expected from the other device.

desirable

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

passive

Enables LACP only when an LACP device is detected. This is the default state.

Command Default

No channel groups are assigned.

Command Modes

Interface configuration

Command History

Release

Modification

11.1CA

This command was introduced.

12.0(7)XE

Support for this command was implemented on Cisco Catalyst 6000 series switches.

12.1(3a)E3

The number of valid values for the number argument was changed; see the "Usage Guidelines" section for valid values.

12.2(2)XT

This command was implemented on the Cisco 2600 series, Cisco 3600 series, and Cisco 3700 series routers.

12.2(8)T

Support for this command was implemented on the Cisco 2600 series, the Cisco 3600 series, and the Cisco 3700 series routers and integrated into Cisco IOS Release 12.2(8)T

Hierarchical Navigation

Cisco IOS Software Releases 12.2 SB

IEEE 802.3ad Link Bundling

Downloads

Table Of Contents

IEEE 802.3ad Link Bundling

Contents

Prerequisites for IEEE 802.3ad Link Bundling

Restrictions for IEEE 802.3ad Link Bundling

Information About 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

How to Configure IEEE 802.3ad Link Bundling

Enabling LACP

SUMMARY STEPS

DETAILED STEPS

Configuring a Port Channel

SUMMARY STEPS

DETAILED STEPS

Examples

Associating a Channel Group with a Port Channel

SUMMARY STEPS

DETAILED STEPS

Setting LACP System Priority

SUMMARY STEPS

DETAILED STEPS

Examples

Adding and Removing Interfaces from a Bundle

SUMMARY STEPS

DETAILED STEPS

Monitoring LACP Status

SUMMARY STEPS

DETAILED STEPS

Troubleshooting Tips

Configuration Examples for IEEE 802.3ad Link Bundling

Associating a Channel Group with a Port Channel: Example

Adding and Removing Interfaces from a Bundle: Example

Monitoring LACP Status: Example

Additional References

Related Documents

Standards

MIBs

RFCs

Technical Assistance

Command Reference

channel-group (interface)

Syntax Description

Command Default

Command Modes

Command History