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Featured Galleries. Gameday Photos. From the Practice Field. In the Community. Fan Photos. Read submissions from the "Letters to Lambeau" program, presented by Cenex. Resilient hashing maps flows to physical ports and it is supported for both ECMP groups and port channel interfaces.
If a physical link fails, the flows originally assigned to the failed link are redistributed uniformly among the remaining working links. The existing flows thorugh the working links are not rehashed and hence are not impacted. Resilient hashing is supported on all the Cisco Nexus Series platforms.
LACP allows you to configure up to 16 interfaces into a port channel. This protocol controls how physical ports are bundled together to form one logical channel. By default, LACP is disabled. The system automatically takes a checkpoint before disabling the feature, and you can roll back to this checkpoint. The following figure shows how individual links can be combined into LACP port channels and channel groups as well as function as individual links.
With LACP, you can bundle up to 32 interfaces in a channel group. When you delete the port channel, the software automatically deletes the associated channel group. All member interfaces revert to their original configuration.
Individual interfaces in port channels are configured with channel modes. When you run static port channels with no aggregation protocol, the channel mode is always set to on. After you enable LACP globally on the device, you enable LACP for each channel by setting the channel mode for each interface to either active or passive.
You can configure channel mode for individual links in the LACP channel group when you are adding the links to the channel group. You must enable LACP globally before you can configure an interface in either the active or passive channel mode.
The LACP is enabled on this port channel and the ports are in a passive negotiating state. The LACP is enabled on this port channel and the ports are in an active negotiating state. Ports initiate negotiations with other ports by sending LACP packets. The LACP is disabled on this port channel and the ports are in a non-negotiating state. The on state of the port channel represents the static mode.
The port will not verify or negotiate port channel memberships. If you attempt to change the channel mode to active or passive before enabling LACP, the device displays an error message. 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.
The passive mode is useful when you do not know whether the remote system, or partner, supports LACP. You can accept the default value of for this parameter, or you can configure a value between 1 and A higher system priority value means a lower priority. You can accept the default value of for the LACP port priority, or you can configure a value between 1 and LACP uses the port priority with the port number to form the port identifier. LACP uses the port priority to decide which ports should be put in standby mode when there is a limitation that prevents all compatible ports from aggregating and which ports should be put into active mode.
A higher port priority value means a lower priority for LACP. You can configure the port priority so that specified ports have a lower priority for LACP and are most likely to be chosen as active links, rather than hot-standby links.
The administrative key defines the ability of a port to aggregate with other ports. Port physical characteristics, such as the data rate and the duplex capability. You can dynamically redistribute the data traffic by using port channels. This redistribution might result from a removed or added link or a change in the load-balancing scheme. Traffic redistribution that occurs in the middle of a traffic flow can cause misordered frames. LACP uses the Marker Protocol to ensure that frames are not duplicated or reordered due to this redistribution.
The Marker Protocol detects when all the frames of a given traffic flow are successfully received at the remote end. The remote system then sends a Marker Responder. Once the Marker Responders are received by the local system on all member links of the port channel, the local system can redistribute the frames in the traffic flow with no chance of misordering.
The software supports only Marker Responders. The following table summarizes the major differences between port channels with LACP enabled and static port channels. When a Cisco Nexus Series device is connected to a non-Nexus peer, its graceful failover defaults may delay the time that is taken to bring down a disabled port or cause traffic from the peer to be lost.
To address these conditions, the lacp graceful-convergence command was added. In some cases, although this feature helps in preventing loops created due to misconfigurations, it can cause servers fail to boot up because they require LACP to logically bring up the port.
You can put a port into an individual state by using the no lacp suspend-individual. Port in individual sate takes attributes of the individual port based on the port configuration. However, the links go into suspended state when the PDUs are not received. This avoids having the links becoming suspended when PDUs are not received. Which port in the port-channel comes up first depends on the port-priority value of the ports. A member link in a port channel with lowest priority value, will come come up first as a LACP delayed port.
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. As a best practice, you must avoid combining these two configurations.
A port channel aggregates similar ports to provide increased bandwidth in a single manageable interface. The introduction of the minimum links and maxbundle feature further refines LACP port-channel operation and provides increased bandwidth in one manageable interface. Configures the minimum number of ports that must be linked up and bundled in the LACP port channel. Causes the LACP port channel to become inactive if there are few active members ports to supply the required minimum bandwidth.
Defines an upper limit on the number of bundled ports in an LACP port channel. Allows hot-standby ports with fewer bundled ports.
For example, in an LACP port channel with five ports, you can designate two of those ports as hot-standby ports. The minimum links and maxbundle feature works only with LACP port channels.
However, the device allows you to configure this feature in non-LACP port channels, but the feature is not operational. You can change the timeout rate from the default rate 30 seconds to the fast rate 1 second. This command is supported only on LACP-enabled interfaces. 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.
You can use the numbers from 1 to in each VDC to number the port channels. All ports in one port channel must be in the same VDC. You must configure load balancing using port channels in the default VDC.
Port channels provide high availability by load balancing traffic across multiple ports. If a physical port fails, the port channel is still operational if there is an active member in the port channel.
You can bundle ports from different modules and create a port channel that remains operational even if a module fails because the settings are common across the module. Port channels support stateful and stateless restarts. A stateful restart occurs on a supervisor switchover. After the switchover, the Cisco NX-OS software applies the runtime configuration after the switchover.
The port channel goes down if the operational ports fall below the configured minimum links number. All ports for a single port channel must be either Layer 2 or Layer 3 ports. All ports for a single port channel must meet the compatibility requirements. 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. The LACP port-channel minimum links and maxbundle feature is not supported for host interface port channels. Do not put shared and dedicated ports into the same port channel. For Layer 2 port channels, ports with different STP port path costs can form a port channel if they are compatibly configured with each other.
In STP, the port-channel cost is based on the aggregated bandwidth of the port members. After you configure a port channel, the configuration that you apply to the port channel interface affects the port channel member ports.
The configuration that you apply to the member ports affects only the member port where you apply the configuration. LACP does not support half-duplex mode. Half-duplex ports in LACP port channels are put in the suspended state.
You must remove the port-security information from a port before you can add that port to a port channel. Similarly, you cannot apply the port-security configuration to a port that is a member of a channel group. Do not configure ports that belong to a port channel group as private VLAN ports. While a port is part of the private VLAN configuration, the port channel configuration becomes inactive.
The following table lists the default settings for port-channel parameters. You can create a port channel before you create a channel group. The software automatically creates the associated channel group. 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.
This is required only when the channel group members are Layer 2 ports switchport and trunks switchport mode trunk. Use the no interface port-channel command to remove the port channel and delete the associated channel group. Removes the port channel and deletes the associated channel group.
Specifies the port-channel interface to configure, and enters the interface configuration mode. The range is from 1 to Optional Displays information about the port channel.
Optional Clears the errors on the interfaces and VLANs where policies correspond with hardware policies. This command allows policy programming to continue and the port to come up. If policies do not correspond, the errors are placed in an error-disabled policy state. Optional Copies the running configuration to the startup configuration.
You can add a Layer 2 port to a new channel group or to a channel group that already contains Layer 2 ports.
The software creates the port channel associated with this channel group if the port channel does not already exist. Use the no channel-group command to remove the port from the channel group. All Layer 2 member ports must run in full-duplex mode and at the same speed. Specifies the interface that you want to add to a channel group, and enters the interface configuration mode.
Configures the interface as a Layer 2 access port. Optional Configures the interface as a Layer 2 trunk port. Optional Configures necessary parameters for a Layer 2 trunk port. Configures the port in a channel group and sets the mode.
The channel-number range is from 1 to This command creates the port channel associated with this channel group if the port channel does not already exist. All static port-channel interfaces are set to mode on. You must set all LACP-enabled port-channel interfaces to active or passive. The default mode is on. Optional Forces an interface with some incompatible configurations to join the channel. The forced interface must have the same speed, duplex, and flow control settings as the channel group.
The force option fails if the port has a QoS policy mismatch with the other members of the port channel. Optional Displays interface information. You can add a Layer 3 port to a new channel group or to a channel group that is already configured with Layer 3 ports. If the Layer 3 port that you are adding has a configured IP address, the system removes that IP address before adding the port to the port channel.
After you create a Layer 3 port channel, you can assign an IP address to the port-channel interface. The port reverts to its original configuration. You must reconfigure the IP addresses for this port. Remove any IP addresses configured on the Layer 3 interface. Configures the interface as a Layer 3 port. The Cisco NX-OS software creates the port channel associated with this channel group if the port channel does not already exist.
This example shows how to create a Layer 3 port-channel interface and assign the IP address:. The bandwidth of the port channel is determined by the number of total active links in the channel. You configure the bandwidth and delay on port-channel interfaces for informational purposes. Specifies the port-channel interface that you want to configure, and enters the interface mode. Specifies the bandwidth, which is used for informational purposes.
The range is from 1 to 3,,, kbs. The default value depends on the total active interfaces in the channel group. Specifies the throughput delay, which is used for informational purposes. The range is from 1 to 16,, tens of microseconds. The default value is 10 microseconds. 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.
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