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Cisco lacp active vs passive investing

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Thus, the spanning-tree domain treats the StackWise Virtual pair as one bridge node instead of two. Virtual Port Channel is a feature that provides the ability to configure a port channel across multiple switches. VSS is different from vPC because VSS creates a single logical switch resulting in a single control plane for management and configuration purposes.

Wherein with vPC, each switch is managed and configured independently. Always bear in mind that since each switch is managed independently, therefore VLAN creation should be done on both Nexus switches. Skip to content. StackWise Virtual StackWise allows link aggregation of two physical switches together into a single logical switch. Here are the major benefits of implementing StackWise in the business: Reduced looped topology-related risks. Reliable business communication through the use of a redundant chassis with SSO-enabled supervisors.

Higher existing investment returns through increased bandwidth from the access layer. Simplified management due to single configuration, thus having fewer operational failure points. Virtual Port Channel vPC Virtual Port Channel is a feature that provides the ability to configure a port channel across multiple switches.

Therefore, if an individual link fails, all of the traffic will be redirected to the remaining working links. The vPC domain has two peer devices and each peer device processes half of the traffic from the access layer. Exits the interface mode and returns to the configuration mode. Optional Displays interface information for the specified port channel.

This example shows how to configure the informational parameters of the bandwidth and delay for port channel You can shut down and restart the port-channel interface. When you shut down a port-channel interface, no traffic passes and the interface is administratively down. Shuts down the interface. No traffic passes and the interface displays as administratively down. The default is no shutdown. Use the no shutdown command to open the interface. The interface displays as administratively up.

If there are no operational problems, traffic passes. This example shows how to bring up the interface for port channel You can configure a description for a port channel. Allows you to add a description to the port-channel interface. You can use up to 80 characters in the description.

By default, the description does not display; you must configure this parameter before the description displays in the output. This example shows how to add a description to port channel You can configure the speed and duplex settings for a port-channel interface. Sets the speed for the port-channel interface. The default is auto for autonegotiation. Sets the duplex for the port-channel interface.

You can configure the load-balancing algorithm for port channels that applies to the entire device. Use the no port-channel load-balance command to restore the default load-balancing algorithm of source-dest-mac for non-IP traffic and source-dest-ip for IP traffic. Specifies the load-balancing algorithm for the device. The range depends on the device.

Optional Displays the port-channel load-balancing algorithm. The port channel is then added to the spanning tree as a single bridge port. Enable LACP globally by using the feature lacp command. You can use different modes for different interfaces within the same LACP-enabled port channel. You can change the mode between active and passive for an interface only if it is the only interface that is designated to the specified channel group.

This channel configuration mode allows the link to operate with LACP. When you configure port channels with no associated aggregation protocol, all interfaces on both sides of the link remain in the on channel mode. Specifies the port mode for the link in a port channel. After LACP is enabled, you configure each link or the entire channel as active or passive. When you run port channels with no associated aggregation protocol, the port-channel mode is always on.

The default port-channel mode is on. Optional Displays summary information about the port channels. You can configure the LACP minimum links feature. Use the no lacp min-links command to restore the default port-channel minimum links configuration. Restores the default port-channel minimum links configuration. Ensure that you are in the correct port-channel interface. Specifies the interface to configure, and enters the interface configuration mode.

Specifies the port-channel interface to configure the number of minimum links. Optional Displays the port-channel minimum links configuration. You can configure the LACP maxbundle feature. Use the no lacp max-bundle command to restore the default port-channel max-bundle configuration. Specifies the port-channel interface to configure max-bundle. The default value for the port-channel max-bundle is The allowed range is from 1 to Optional Displays the port-channel max-bundle configuration.

This example shows how to configure the port channel interface max-bundle:. We do not recommend changing the LACP timer rate. Configuring lacp rate fast is not recommended on the vPC Peer-Links. When lacp rate fast is configured on the vPC Peer-Link member interfaces, an alert is displayed in the syslog messages only when the LACP logging level is set to 5. Specifies the interface to configure and enters the interface configuration mode. To reset the timeout rate to its default, use the no form of the command.

Configures the system priority for use with LACP. Valid values are from 1 through , and higher numbers have a lower priority. The default value is This example shows how to set the LACP system priority to Configures the port priority for use with LACP. By default, LACP graceful convergence is enabled.

In situations where you need to support LACP interoperability with devices where the graceful failover defaults may delay the time taken for a disabled port to be brought down or cause traffic from the peer to be lost, you can disable convergence. The port channel has to be in the administratively down state before the command can be run. Specifies the port channel interface to configure and enters the interface configuration mode. Administratively shuts down the port channel. Disables LACP graceful convergence on the port channel.

Brings the port channel administratively up. This example shows how to disable LACP graceful convergence on a port channel:. If the default LACP graceful convergence is once again required, you can reenable convergence.

Enables LACP graceful convergence on the port channel. This example shows how to enable LACP graceful convergence on a port channel:. This process can cause some servers to fail to boot up as they require LACP to logically bring up the port. You should only enter the lacp suspend-individual command on edge ports. The port channel has to be in the administratively down state before you can use this command. This example shows how to disable LACP individual port suspension on a port channel:.

You can reenable the default LACP individual port suspension. This example shows how to reenable the LACP individual port suspension on a port channel:. Cisco NX-OS supports the adaptive and fixed hash distribution configuration for both global and port-channel levels. This option minimizes traffic disruption by minimizing Result Bundle Hash RBH distribution changes when members come up or go down so that flows that are mapped to unchange RBH values continue to flow through the same links.

The port-channel level configuration overrules the global configuration. The default configuration is adaptive globally, and there is no configuration for each port channel, so there is no change during an ISSU. No ports are flapped when the command is applied, and the configuration takes effect at the next member link change event. Both modes work with RBH module or non-module schemes. During an ISSD to a lower version that does not support this feature, you must disable this feature if the fixed mode command is being used globally or if there is a port-channel level configuration.

This example shows how to configure hash distribution at the global level:. Specifies the port-channel hash distribution at the port channel level. This example shows how to configure hash distribution as a global-level command:. To display port-channel configuration information, perform one of the following tasks:.

Displays the status of a port-channel interface. Sets three different sampling intervals to bit-rate and packet-rate statistics. Displays the parameters that must be the same among the member ports in order to join a port channel. Displays the aggregation state for one or more port-channel interfaces. Displays the type of load balancing in use for port channels. Displays a summary for the port-channel interfaces.

Displays the traffic statistics for port channels. Displays the range of used and unused channel numbers. Displays information about the running configuration of the port-channel. Use the following commands to display port-channel interface configuration information. Displays input and output octets unicast packets, multicast packets, and broadcast packets. Displays input packets, bytes, and multicast and output packets and bytes.

Displays information about the number of error packets. This example shows how to create an LACP port channel and add two Layer 2 interfaces to that port channel:. This example shows how to add two Layer 3 interfaces to a channel group. Skip to content Skip to search Skip to footer.

Bias-Free Language. Bias-Free Language The documentation set for this product strives to use bias-free language. Find Matches in This Book. Log in to Save Content. PDF - Complete Book 5. Updated: May 17, Chapter: Configuring Port Channels.

Note After a Layer 2 port becomes part of a port channel, all switchport configurations must be done on the port channel; you can no longer apply switchport configurations to individual port-channel members.

Port Channels A port channel bundles physical links into a channel group to create a single logical link that provides the aggregate bandwidth of up to 32 physical links. Port-Channel Interfaces The following shows port-channel interfaces.

Figure 1. Basic Settings You can configure the following basic settings for the port-channel interface: Bandwidth—Use this setting for informational purposes only; this setting is to be used by higher-level protocols. Description Duplex IP addresses Maximum Transmission Unit MTU Shutdown Speed Compatibility Requirements When you add an interface to a channel group, the software checks certain interface attributes to ensure that the interface is compatible with the channel group.

Load Balancing Using Port Channels The Cisco NX-OS software load balances traffic across all operational interfaces in a port channel by hashing the addresses in the frame to a numerical value that selects one of the links in the channel. Symmetric Hashing To be able to effectively monitor traffic on a port channel, it is essential that each interface connected to a port channel receives both forward and reverse traffic flows.

Only the following load-balancing algorithms support symmetric hashing: src-dst ip src-dst ip-l4port Resilient Hashing With the exponential increase in the number of physical links used in data centers, there is also the potential for an increase in the number of failed physical links.

Figure 2. Note When you delete the port channel, the software automatically deletes the associated channel group. Port-Channel Modes Individual interfaces in port channels are configured with channel modes. You can configure channel mode for individual links in the LACP channel group when you are adding the links to the channel group Note You must enable LACP globally before you can configure an interface in either the active or passive channel mode.

The following table describes the channel modes. Table 1. The on state is the default port-channel mode Both the passive and active modes allow LACP to negotiate between ports to determine if they can form a port channel based on criteria such as the port speed and the trunking state.

Active Passive Can form a port channel. Passive Passive Cannot form a port channel because no ports can initiate negotiation. Table 3. Regardless of the operational status of the links, the configured priority of a LACP port is used to select the delayed-lacp port This feature supports Layer 2 port channels, trunk mode spanning tree, and vPC and has the following limitations: Using no lacp suspend-individual and lacp mode delay on a same port channel is not recommended because it can put non-lacp delayed ports in individual state.

Not supported on Layer 3 port channels. Prevents the low-bandwidth LACP port channel from becoming active. Virtualization Support You must configure the member ports and other port channel-related configuration from the virtual device context VDC that contains the port channel and member ports. Note You must configure load balancing using port channels in the default VDC. High Availability Port channels provide high availability by load balancing traffic across multiple ports.

Prerequisites for Port Channeling Port channeling has the following prerequisites: You must be logged onto the device. You must configure load balancing from the default VDC. Guidelines and Limitations Port channeling has the following configuration guidelines and limitations: For scaled port-channel deployments on Cisco Nexus switch with Gen 1 line cards, you need to use the port-channel scale-fanout command followed by copy run start and reload commands.

You must enable LACP before you can use that feature. You can configure multiple port channels on a device. Channel member ports cannot be a source or destination SPAN port. Table 4. Note When the port channel is created before the channel group, the port channel should be configured with all of the interface attributes that the member interfaces are configured with. Note Use the no interface port-channel command to remove the port channel and delete the associated channel group. Command Purpose no interface port-channel channel-number Example: switch config no interface port-channel 1 Removes the port channel and deletes the associated channel group.

Step 2 interface port-channel channel-number Example: switch config interface port-channel 1 switch config-if Specifies the port-channel interface to configure, and enters the interface configuration mode. Step 3 show port-channel summary Example: switch config-router show port-channel summary Optional Displays information about the port channel.

Step 5 copy running-config startup-config Example: switch config copy running-config startup-config Optional Copies the running configuration to the startup configuration. Adding a Layer 2 Port to a Port Channel You can add a Layer 2 port to a new channel group or to a channel group that already contains Layer 2 ports.

Note Use the no channel-group command to remove the port from the channel group. Command Purpose no channel-group Example: switch config no channel-group Removes the port from the channel group. Step 3 switchport Example: switch config switchport Configures the interface as a Layer 2 access port.

Step 4 switchport mode trunk Example: switch config switchport mode trunk Optional Configures the interface as a Layer 2 trunk port. Note The force option fails if the port has a QoS policy mismatch with the other members of the port channel. Step 9 copy running-config startup-config Example: switch config copy running-config startup-config Optional Copies the running configuration to the startup configuration. Step 3 no switchport Example: switch config-if no switchport Configures the interface as a Layer 3 port.

Step 7 copy running-config startup-config Example: switch config copy running-config startup-config Optional Copies the running configuration to the startup configuration. Step 2 interface port-channel channel-number Example: switch config interface port-channel 2 switch config-if Specifies the port-channel interface that you want to configure, and enters the interface mode.

Step 3 bandwidth value Example: switch config-if bandwidth switch config-if Specifies the bandwidth, which is used for informational purposes. Step 4 delay value Example: switch config-if delay switch config-if Specifies the throughput delay, which is used for informational purposes. Step 5 exit Example: switch config-if exit switch config Exits the interface mode and returns to the configuration mode. Step 6 show interface port-channel channel-number Example: switch show interface port-channel 2 Optional Displays interface information for the specified port channel.

Example This example shows how to configure the informational parameters of the bandwidth and delay for port channel 5: switch configure terminal switch config interface port-channel 5 switch config-if bandwidth switch config-if delay switch config-if Shutting Down and Restarting the Port-Channel Interface You can shut down and restart the port-channel interface. Step 3 shutdown Example: switch config-if shutdown switch config-if Shuts down the interface.

Note Use the no shutdown command to open the interface. Step 4 exit Example: switch config-if exit switch config Exits the interface mode and returns to the configuration mode. Step 5 show interface port-channel channel-number Example: switch config-router show interface port-channel 2 Optional Displays interface information for the specified port channel.

Example This example shows how to bring up the interface for port channel 2: switch configure terminal switch config interface port-channel 2 switch config-if no shutdown Configuring a Port-Channel Description You can configure a description for a port channel. Step 3 description Example: switch config-if description engineering switch config-if Allows you to add a description to the port-channel interface.

Step 5 show interface port-channel channel-number Example: switch show interface port-channel 2 Optional Displays interface information for the specified port channel. Step 6 copy running-config startup-config Example: switch config copy running-config startup-config Optional Copies the running configuration to the startup configuration. Example This example shows how to add a description to port channel 2: switch configure terminal switch config interface port-channel 2 switch config-if description engineering Configuring the Speed and Duplex Settings for a Port-Channel Interface You can configure the speed and duplex settings for a port-channel interface.

Note Use the no port-channel load-balance command to restore the default load-balancing algorithm of source-dest-mac for non-IP traffic and source-dest-ip for IP traffic. Command Purpose no port-channel load-balance Example: switch config no port-channel load-balance Restores the default load-balancing algorithm.

Note Only the following load-balancing algorithms support symmetric hashing: src-dst ip src-dst ip-l4port Step 3 show port-channel load-balance Example: switch config-router show port-channel load-balance Optional Displays the port-channel load-balancing algorithm. Step 4 copy running-config startup-config Example: switch config copy running-config startup-config Optional Copies the running configuration to the startup configuration. Step 3 copy running-config startup-config Example: switch config copy running-config startup-config Optional Copies the running configuration to the startup configuration.

Step 4 show port-channel summary Example: switch config-if show port-channel summary Optional Displays summary information about the port channels. Note Use the no lacp min-links command to restore the default port-channel minimum links configuration. Command Purpose no lacp min-links Example: switch config no lacp min-links Restores the default port-channel minimum links configuration.

Before you begin Ensure that you are in the correct port-channel interface. Step 2 interface port-channel number Example: switch config interface port-channel 3 switch config-if Specifies the interface to configure, and enters the interface configuration mode. Step 3 lacp min-links number Example: switch config-if lacp min-links 3 Specifies the port-channel interface to configure the number of minimum links.

Step 4 show running-config interface port-channel number Example: switch config-if show running-config interface port-channel 3 Optional Displays the port-channel minimum links configuration. Note Use the no lacp max-bundle command to restore the default port-channel max-bundle configuration. Command Purpose no lacp max-bundle Example: switch config no lacp max-bundle Restores the default port-channel max-bundle configuration. Step 3 lacp max-bundle number Example: switch config-if lacp max-bundle Specifies the port-channel interface to configure max-bundle.

Step 4 show running-config interface port-channel number Example: switch config-if show running-config interface port-channel 3 Optional Displays the port-channel max-bundle configuration. Step 2 lacp system-priority priority Example: switch config lacp system-priority Configures the system priority for use with LACP.

Step 3 lacp port-priority priority Example: switch config-if lacp port-priority Configures the port priority for use with LACP. Step 4 copy running-config startup-config Example: switch config-if copy running-config startup-config Optional Copies the running configuration to the startup configuration. Note The port channel has to be in the administratively down state before the command can be run. Step 2 interface port-channel number Example: switch config interface port-channel 1 switch config-if Specifies the port channel interface to configure and enters the interface configuration mode.

Step 3 shutdown Example: switch config-if shutdown Administratively shuts down the port channel. Step 4 no lacp graceful-convergence Example: switch config-if no lacp graceful-convergence Disables LACP graceful convergence on the port channel.

Step 5 no shutdown Example: switch config-if no shutdown Brings the port channel administratively up. Example This example shows how to disable LACP graceful convergence on a port channel: switch configure terminal switch config interface port-channel 1 switch config-if shutdown switch config-if no lacp graceful-convergence switch config-if no shutdown Reenabling LACP Graceful Convergence Reenabling LACP Graceful Convergence If the default LACP graceful convergence is once again required, you can reenable convergence.

Step 4 lacp graceful-convergence Example: switch config-if lacp graceful-convergence Enables LACP graceful convergence on the port channel. Note You should only enter the lacp suspend-individual command on edge ports. Step 4 no lacp suspend-individual Example: switch config-if no lacp suspend-individual Disables LACP individual port suspension behavior on the port channel. Example This example shows how to disable LACP individual port suspension on a port channel: switch configure terminal switch config interface port-channel 1 switch config-if shutdown switch config-if no lacp suspend-individual switch config-if no shutdown Reenabling LACP Suspend Individual You can reenable the default LACP individual port suspension.

Step 4 lacp suspend-individual Example: switch config-if lacp suspend-individual Enables LACP individual port suspension behavior on the port channel. Example This example shows how to reenable the LACP individual port suspension on a port channel: switch configure terminal switch config interface port-channel 1 switch config-if shutdown switch config-if lacp suspend-individual switch config-if no shutdown Configuring Port Channel Hash Distribution Cisco NX-OS supports the adaptive and fixed hash distribution configuration for both global and port-channel levels.

The default is adaptive mode. There is no default. Example This example shows how to configure hash distribution as a global-level command: switch configure terminal switch config no port-channel hash-distribution fixed Verifying the Port-Channel Configuration To display port-channel configuration information, perform one of the following tasks: Command Purpose show interface port-channel channel-number Displays the status of a port-channel interface.

Monitoring the Port-Channel Interface Configuration Use the following commands to display port-channel interface configuration information. Command Purpose clear counters interface port-channel channel-number Clears the counters. Was this Document Helpful?

Yes No Feedback. Can form a port channel. Cannot form a port channel because no ports can initiate negotiation. Cannot form a port channel because LACP is enabled only on one side. Cannot form a port channel because LACP is not enabled. Protocol applied. Enable globally. Not applicable. Channel mode of links. Can be either: Active Passive.

Can only be On. Maximum number of links in channel. Port channel. Admin up. Load balancing method for Layer 3 interfaces. Source and destination IP address. Load balancing method for Layer 2 interfaces. Source and destination MAC address. Load balancing per module. Channel mode. LACP system priority. LACP port priority. Minimum links for LACP. Minimum links for FEX fabric port channel. Command Purpose no interface port-channel channel-number Example: switch config no interface port-channel 1.

Step 1. Enters global configuration mode. Step 2. Step 3. Step 4. Step 5. Command Purpose no channel-group Example: switch config no channel-group. Removes the port from the channel group. Step 6. Step 7. Step 8.

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So the likelihood of one of those eight going down is exponentially larger but if one goes down, no problem. The remaining links stay up and keep the EtherChannel bundle active. So the throughput and connectivity still exists. So the only time an EtherChannel link will go down is when all physical links fail within the bundle.

So this is so tremendously powerful to the scaling of our network. So this is a technology that is used in so many different places. We call it adapter teaming in some places. One instance of spanning tree protocol per VLAN. So think about all the different uplinks you have and then when you manipulate spanning tree protocol, you can use them all, you can use them all in that case.

Really a great way for us to improve and increase our bandwidth at a relatively low cost. We can go it our own and manually configure an EtherChannel bundle, or we can use a kinder and gentler negotiation approach. But given a standardized approach we often lean towards a standardized approach. In my mind these are equal, except for the fact that one is standard; one is proprietary. Now I know we see On here but I want you to remember that in this mode there is no protocol.

So really we are dealing with Desirable and Auto. Desirable and Auto, we saw those terms earlier. So if you look at the different options here: On-On, we will form a bundle. Desirable-Desirable, we will form a bundle. Desirable-Auto, we will form a bundle. And those are the only options. This is different than our trunks. Our trunks, we can set it to trunk, which was On and we would form a trunk with a Desirable or Auto site, because DTP was still being used.

This is the difference, and you can get thrown off by differences like this on any type of exam. In this case, On — no protocol, therefore, both sides have to be On in order to form the EtherChannel bundle. I can vividly recall crashing some switches, trying to do On on one side and Auto on the other. Because I was thinking that it was like our trunking. Because when I moved the far side to On, that side had one port that was previously blocking.

So I essentially moved a port to the forwarding state, causing a loop. So you have to be very careful, very, very careful in the real world with this configuration. Once these frames are exchanged, and if the ports on both side agree that they support the requirements, LACP will form an EtherChannel. EtherChannel technology was invented in the early s. They were later acquired by Cisco Systems in In the IEEE passed Any of these three mechanisms will suffice for most scenarios, however the choice does deserve some consideration.

PAgP, while perfectly able, should probably be disqualified as a legacy proprietary protocol unless you have a specific need for it such as ancient hardware. However, this negotiation introduces an overhead and delay in initialization. If a failure occurs on an active port, the hot-standby port can replace it.