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The following sections provide information about EtherChannels and the various modes to configure EtherChannels:. EtherChannel provides fault-tolerant high-speed links between switches, routers, and servers. You can use the EtherChannel to increase the bandwidth between the wiring closets and the data center, and you can deploy it anywhere in the network where bottlenecks are likely to occur. EtherChannel provides automatic recovery for the loss of a link by redistributing the load across the remaining links.

If a link fails, EtherChannel redirects traffic from the failed link to the remaining links in the channel without intervention. An EtherChannel consists of individual Ethernet links bundled into a single logical link. An EtherChannel comprises a channel group and a port-channel interface. The channel group binds physical ports to the port-channel interface.

layer 2 etherchannel configuration

Configuration changes applied to the port-channel interface apply to all the physical ports bound together in the channel group. The channel-group command binds the physical port and the port-channel interface together. Each EtherChannel has a port-channel logical interface numbered from 1 to This port-channel interface number corresponds to the one specified with the channel-group interface configuration command.

With Layer 2 ports, use the channel-group interface configuration command to dynamically create the port-channel interface.

Layer 2 and Layer 3 Configuration Guide, Cisco IOS XE Everest 16.6.x (Catalyst 9500 Switches)

You also can use the interface port-channel port-channel-number global configuration command to manually create the port-channel interface, but then you must use the channel-group channel-group-number command to bind the logical interface to a physical port. The channel-group-number can be the same as the port - channel-number, or you can use a new number.

If you use a new number, the channel-group command dynamically creates a new port channel. With Layer 3 ports, you should manually create the logical interface by using the interface port-channel global configuration command followed by the no switchport interface configuration command. You then manually assign an interface to the EtherChannel by using the channel-group interface configuration command. With Layer 3 ports, use the no switchport interface command to configure the interface as a Layer 3 interface, and then use the channel-group interface configuration command to dynamically create the port-channel interface.

PAgP can be enabled on cross-stack EtherChannels.Your software release may not support all the features documented in this module.

For the latest caveats and feature information, see Bug Search Tool and 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 table at the end of this module.

Use Cisco Feature Navigator to find information about platform support and Cisco software image support. An account on Cisco. EtherChannel provides fault-tolerant high-speed links between switches, routers, and servers.

You can use the EtherChannel to increase the bandwidth between the wiring closets and the data center, and you can deploy it anywhere in the network where bottlenecks are likely to occur. EtherChannel provides automatic recovery for the loss of a link by redistributing the load across the remaining links. If a link fails, EtherChannel redirects traffic from the failed link to the remaining links in the channel without intervention.

An EtherChannel consists of individual Ethernet links bundled into a single logical link. An EtherChannel comprises a channel group and a port-channel interface. The channel group binds physical ports to the port-channel interface.

Configuration changes applied to the port-channel interface apply to all the physical ports bound together in the channel group. The channel-group command binds the physical port and the port-channel interface together. Each EtherChannel has a port-channel logical interface numbered from 1 to This port-channel interface number corresponds to the one specified with the channel-group interface configuration command.

With Layer 2 ports, use the channel-group interface configuration command to dynamically create the port-channel interface. You also can use the interface port-channel port-channel-number global configuration command to manually create the port-channel interface, but then you must use the channel-group channel-group-number command to bind the logical interface to a physical port.

The channel-group-number can be the same as the port - channel-number, or you can use a new number. If you use a new number, the channel-group command dynamically creates a new port channel. With Layer 3 ports, you should manually create the logical interface by using the interface port-channel global configuration command followed by the no switchport interface configuration command.

You then manually assign an interface to the EtherChannel by using the channel-group interface configuration command. With Layer 3 ports, use the no switchport interface command to configure the interface as a Layer 3 interface, and then use the channel-group interface configuration command to dynamically create the port-channel interface. PAgP can be enabled on cross-stack EtherChannels.

Lesson 4 3 Layer 2 EtherChannel Configuration

By using PAgP, the device or device stack learns the identity of partners capable of supporting PAgP and the capabilities of each port. It then dynamically groups similarly configured ports on a single device in the stack into a single logical link channel or aggregate port.

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Similarly configured ports are grouped based on hardware, administrative, and port parameter constraints. After grouping the links into an EtherChannel, PAgP adds the group to the spanning tree as a single device port.

Places a port into a passive negotiating state, in which the port responds to PAgP packets it receives but does not start PAgP packet negotiation. This setting minimizes the transmission of PAgP packets.

Places a port into an active negotiating state, in which the port starts negotiations with other ports by sending PAgP packets. Switch ports exchange PAgP packets only with partner ports configured in the auto or desirable modes.Your email address will not be published. Notify me of follow-up comments by email. Notify me of new posts by email.

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NOTE: These settings will only apply to the browser and device you are currently using. Skip to content Cisco. Etherchannel is a port aggregation feature that allows for the bonding together of two or more switch ports into a logical interface. The logical port, with the combined capacity of the individual ports, is then used to carry layer two frames or layer three packets, depending on the configuration.

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In this post, we will look at each protocol and its configuration method for layer 2 etherchannel. Etherchannel bundling with three gigabit interfaces. Link Aggregation Control Protocol is an industry standard It is available on both Cisco and non-Cisco switches. All participating ports in a single logical interface must have the same settings such as duplex mode, speed and must all the either access or trunk ports.

LACP allows for the aggregation of up to 16 switch ports but only a maximum of 8 can be active at a time while the remaining 8 will be in standby mode. LACP can be configured either in active or passive mode. Active mode means the channel interface will actively try to negotiate interchannel bonding while passive will only responds to a request for an etherchannel bonding but will not initiate the process. To successfully configure etherchannel bonding between two Cisco switches using LACP as the aggregation protocol, the following configuration commands are required: In this demonstration, we are going to establish an etherchannel bonding between switches 1 and 2, using three fast ethernet ports on both switches.

This will provide a bandwidth capacity of Mbps between both switches instead of the Mbps provided by a single port. SW1 config-if-range switchport trunk encap dot1q. SW1 config-if-range switchport mode trunk. SW1 config-if-range channel-group 20 mode active.

layer 2 etherchannel configuration

SW1 config-if-range end. SW2 config-if-range switchport trunk encap dot1q. SW2 config-if-range switchport mode trunk. SW2 config-if-range channel-group 20 mode active. SW2 config-if-range end. Each participating port should have a P in front of it. Flags: D — down P — in port-channel. I — stand-alone s — suspended. R — Layer3 S — Layer2. U — in use f — failed to allocate aggregator. Number of channel-groups in use: 1.EtherChannel is a way of combining multiple ports into a single one.

Layer 2 EtherChannel combines multiple physical switchports whereas Layer 3 EtherChannel combines multiple logical interfaces such as subinterfaces. You must be logged in to post a comment. Necessary cookies are absolutely essential for the website to function properly.

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It is mandatory to procure user consent prior to running these cookies on your website. Skip to content Overview: EtherChannel is a way of combining multiple ports into a single one. Study Notes: There are 3 options when configuring Port-Channels: 2. Leave a Reply Cancel You must be logged in to post a comment. This website uses cookies to improve your experience. We'll assume you're ok with this, but you can opt-out if you wish.

Close Privacy Overview This website uses cookies to improve your experience while you navigate through the website. Out of these cookies, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website.

We also use third-party cookies that help us analyze and understand how you use this website. These cookies will be stored in your browser only with your consent. You also have the option to opt-out of these cookies. But opting out of some of these cookies may have an effect on your browsing experience. Necessary Necessary. Non-necessary Non-necessary.This document provides sample configurations on IEEE This document discusses the most important factors to consider when you configure trunking and channeling between the switches.

The document also includes configuration examples. In order to create the examples in this document, these switches were used in a lab environment, with cleared configurations:.

The information in this document was created from the devices in a specific lab environment. All of the devices used in this document started with a cleared default configuration. If your network is live, make sure that you understand the potential impact of any command.

Refer to Cisco Technical Tips Conventions for more information on document conventions. DTP allows both devices connected to negotiate the trunk settings before actually forming the trunk connection. Configurable Cisco IOS Software switch port trunking modes include: dynamic the port negotiates either access or trunk modetrunk unconditionally sets the port to trunkingand access non-trunk access port. The most commonly used mode combination settings on two sides of a static non-DTP negotiated trunk are trunk-trunk.

For dynamic DTP-negotiated trunks, the usual settings are dynamic-dynamic. Other combinations may produce valid results but are outside the scope of this document.

The In most cases, the native VLAN has to match on both sides of the trunk unless there is a specific unusual configuration requirement, which is outside the scope of this document. This will tag all other necessary VLANs, and they will pass traffic over the trunk to the neighbor or third-party device.

Issue the vlan dot1q tag native command under global configuration mode. PAgP allows both devices connected to negotiate the settings before actually forming the channel. PAgP channel modes include: desirable the port actively initiates channel negotiationauto default, in which the port does not initiate negotiation but responds to negotiation attempts started by the other sideand on unconditionally sets the port to channel and does not exchange PAgP frames.

The most commonly used mode combination on two sides of a static non-PAgP negotiated channel is on-on. For dynamic PAgP-negotiated channels, the usual settings are either desirable-desirable or desirable-auto.

EtherChannel Configuration

The connected ports configured for desirable mode perform channel negotiation and verification before starting the channeling and also keep verifying the channel when it is in operation. Due to the added protection offered by PAgP, this is usually the recommended setup if both connected switches support PAgP. The ports to negotiate a channel must have the same speed, duplex, trunking encapsulation, and VLAN set.

Also, the channel load balancing algorithm across links may be configurable on certain platforms. Therefore, to avoid STP inconsistencies when setting up a non-negotiated channel, proceed as follows:. The steps only apply if PAgP is not used. Refer to the note above for more information. For more information, refer to this document:. Load balancing across the links in the channel is always destination address-based. Source is the default. Source-based forwarding allows up to eight ports in a FEC port group.

Destination-based forwarding allows unlimited ports per port group. SPAN and port security are not supported. Catalyst switches only support EtherChannel provides fault-tolerant high-speed links between switches, routers, and servers.

You can use Etherchannels to increase the bandwidth between the wiring closets and the data center, and you can deploy it anywhere in the network where bottlenecks are likely to occur. EtherChannel provides automatic recovery for the loss of a link by redistributing the load across the remaining links.

If a link fails, EtherChannel redirects traffic from the failed link to the remaining links in the channel without intervention. Your software release may not support all the features documented in this module.

layer 2 etherchannel configuration

For the latest feature information and caveats, see the release notes for your platform and software release. Use Cisco Feature Navigator to find information about platform support and Cisco software image support.

An account on Cisco. An EtherChannel consists of individual Gigabit Ethernet links bundled into a single logical link. Each EtherChannel can consist of up to eight compatibly configured Ethernet ports. The number of EtherChannels is limited to The EtherChannel Layer 3 ports are made up of routed ports. Routed ports are physical ports configured to be in Layer 3 mode by using the no switchport interface configuration command.

Configure both ends of the EtherChannel in the same mode:. If a link within an EtherChannel fails, traffic previously carried over that failed link moves to the remaining links within the EtherChannel. If traps are enabled on the switch, a trap is sent for a failure that identifies the switch, the EtherChannel, and the failed link.

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Inbound broadcast and multicast packets on one link in an EtherChannel are blocked from returning on any other link of the EtherChannel. The channel-group command binds the physical port and the logical interface together. Each EtherChannel has a port-channel logical interface numbered from 1 to This port-channel interface number corresponds to the one specified with the channel-group interface configuration command.

After you configure an EtherChannel, configuration changes applied to the port-channel interface apply to all the physical ports assigned to the port-channel interface. Configuration changes applied to the physical port affect only the port where you apply the configuration. To change the parameters of all ports in an EtherChannel, apply configuration commands to the port-channel interface, for example, spanning-tree commands or commands to configure a Layer 2 EtherChannel as a trunk.

PAgP can be enabled on cross-stack EtherChannels. By using PAgP, the switch or switch stack learns the identity of partners capable of supporting PAgP and the capabilities of each port.EtherChannel has been a part of the Cisco IOS for many years, so you should find that all your switches support it with proper configuration.

Do not be afraid to enable it on a pair of ports and try it. When setting up an EtherChannel connection, remember the following points; they can help you avoid problems during the configuration process:. You can configure up to eight ports, and all of these ports should be the same type Fast Ethernet, Gigabit Ethernet.

layer 2 etherchannel configuration

Ensure that all ports are enabled and that none have been configured using the shutdown command. Switchport settings from the first port in EtherChannel are copied to all other ports in the EtherChannel when the ports are added to the channel group.

This is a copy action and not a link, so if you change the settings after the fact, you need to change the settings on all ports. The settings that must remain the same across all ports are. Only use standard connection ports on the front of your switch for EtherChannel connections.

Change switchport to trunk or accessbut all ports must be in the same VLAN. The following commands are the setup commands you use for configuring one of the switches for EtherChannel.

This also means that the switch at the other end of the connections needs to be a Cisco switch as well. Note that on the second switch, you applied the following configuration.

Notice that the channel-group used on this switch is different. Different port groups are allowed because it is simply a local to the switch configuration to keep each port group uniquely identified.

Many IT administrators do keep the channel-group numbers the same because by matching the port group numbers on either end of the connection, you can avoid confusion for others.

EtherChannel Configuration. About the Book Author Edward Tetz has worked with computers as a sales associate, support tech, trainer, and consultant. Sets the interface to respond to PAgP negotiation packets, but the interface will start negotiations on its own. Forces the connection to bring all links up without using a protocol to negotiate connections.