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When an interface is in the err-disabled state, use the errdisable detect cause command to find information about the error. You can configure the automatic error-disabled recovery timeout for a particular error-disabled cause and configure the recovery period. The errdisable recovery cause command provides an automatic recovery after seconds.

You can use the errdisable recovery interval command to change the recovery period within a range of 30 to seconds. You can also configure the recovery timeout for a particular err-disable cause. If you do not enable the error-disabled recovery for the cause, the interface stays in the error-disabled state until you enter the shutdown and no shutdown commands.

If the recovery is enabled for a cause, the interface is brought out of the error-disabled state and allowed to retry operation once all the causes have timed out. Use the show interface status err-disabled command to display the reason behind the error. The medium dependent interface crossover MDIX parameter enables or disables the detection of a crossover connection between devices.

This parameter applies only to copper interfaces. By default, this parameter is enabled.

A policy is defined through the command-line interface. Policies are pushed when you configure a policy on an interface to ensure that policies that are pushed are consistent with the hardware policies. To clear the errors and to allow the policy programming to proceed with the running configuration, enter the no shutdown command. If the policy programming succeeds, the port is allowed to come up. If the policy programming fails, the configuration is inconsistent with the hardware policies and the port is placed in an error-disabled policy state. The error-disabled policy state remains and the information is stored to prevent the same port from being brought up in the future.

This process helps to avoid unnecessary disruption to the system. The maximum transmission unit MTU size specifies the maximum frame size that an Ethernet port can process. For transmissions to occur between two ports, you must configure the same MTU size for both ports. A port drops any frames that exceed its MTU size. Larger MTU sizes are possible for more efficient processing of data to allow different application requirements.

The larger frames, are also called jumbo frames, can be up to bytes in size. MTU is configured per interface, where an interface can be a Layer 2 or a Layer 3 interface. The system default MTU value is bytes. Every Layer 2 interface is configured with this value by default. You can configure an interface with the default system jumbo MTU value, that is bytes. To allow an MTU value from through , you must adjust the system jumbo MTU to an appropriate value where interface can be configured with the same value.

You can change the system jumbo MTU size.

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When the value is changed, the Layer 2 interfaces that use the system jumbo MTU value, will automatically changes to the new system jumbo MTU value. A Layer 3 interface, can be Layer 3 physical interface configure with no switchport , switch virtual interface SVI , and sub-interface, you can configure an MTU size between and bytes. The G interfaces are mapped to specific hardware ports where the default MTU is In the case of G interfaces, since the MTU limit check is disabled, it ignores the packet size and traffic flows irrespective of its MTU. Ethernet ports have a fixed bandwidth of 1,, Kb at the physical layer.

Layer 3 protocols use a bandwidth value that you can set for calculating their internal metrics. The value that you set is used for informational purposes only by the Layer 3 protocols—it does not change the fixed bandwidth at the physical layer. Specifying a value for the throughput-delay parameter provides a value used by Layer 3 protocols; it does not change the actual throughput delay of an interface. The Layer 3 protocols can use this value to make operating decisions.

The delay value that you set is in the tens of microseconds. The administrative-status parameter determines whether an interface is up or down. When an interface is administratively down, it is disabled and unable to transmit data. When an interface is administratively up, it is enabled and able to transmit data. The Cisco-proprietary Unidirectional Link Detection UDLD protocol allows devices that are connected through fiber-optic or copper for example, Category 5 cabling Ethernet cables to monitor the physical configuration of the cables and detect when a unidirectional link exists.

Unidirectional links can cause a variety of problems. UDLD performs tasks that autonegotiation cannot perform, such as detecting the identities of neighbors and shutting down misconnected LAN ports. When you enable both autonegotiation and UDLD, Layer 1 detections work to prevent physical and logical unidirectional connections and the malfunctioning of other protocols.

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A unidirectional link occurs whenever traffic transmitted by the local device over a link is received by the neighbor but traffic transmitted from the neighbor is not received by the local device. If one of the fiber strands in a pair is disconnected, as long as autonegotiation is active, the link does not stay up. In this case, the logical link is undetermined, and UDLD does not take any action.

If both fibers are working normally at Layer 1, UDLD determines whether those fibers are connected correctly and whether traffic is flowing bidirectionally between the correct neighbors. This check cannot be performed by autonegotiation, because autonegotiation operates at Layer 1. If the frames are echoed back within a specific time frame and they lack a specific acknowledgment echo , the link is flagged as unidirectional and the LAN port is shut down.

Devices on both ends of the link must support UDLD in order for the protocol to successfully identify and disable unidirectional links.

You can configure the transmission interval for the UDLD frames, either globally or for the specified interfaces. The figure shows an example of a unidirectional link condition. Device B successfully receives traffic from device A on the port. However, device A does not receive traffic from device B on the same port. UDLD detects the problem and disables the port. UDLD aggressive mode is disabled by default. After eight failed retries, the port is disabled. In these cases, the UDLD aggressive mode disables one of the ports on the link, which prevents traffic from being discarded.

You enable the UDLD aggressive mode globally to enable that mode on all the fiber ports. You must enable the UDLD aggressive mode on copper ports on specified interfaces. When a line card upgrade is being performed during an in-service software upgrade ISSU and some of the ports on the line card are members of a Layer 2 port channel and are configured with UDLD aggressive mode, if you shut down one of the remote ports, UDLD puts the corresponding port on the local device into an error-disabled state. This behavior is correct. To restore service after the ISSU has completed, enter the shutdown command followed by the no shutdown command on the local port.

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A port channel is an aggregation of physical interfaces that comprise a logical interface. You can bundle up to 32 individual interfaces into a port channel to provide increased bandwidth and redundancy.

Port channeling also load balances traffic across these physical interfaces. The port channel stays operational if at least one physical interface within the port channel is operational. You can create Layer 3 port channels by bundling compatible Layer 3 interfaces. Any configuration changes that you apply to the port channel are applied to each interface member of that port channel. On Cisco Nexus Series switches , you can create a port profile that contains many interface commands and apply that port profile to a range of interfaces.

Each port profile can be applied only to a specific type of interface; the choices are as follows:. When you choose Ethernet or port channel as the interface type, the port profile is in the default mode which is Layer 3. Enter the switchport command to change the port profile to Layer 2 mode. You inherit the port profile when you attach the port profile to an interface or range of interfaces. When you attach, or inherit, a port profile to an interface or range of interfaces, the system applies all the commands in that port profile to the interfaces. Additionally, you can have one port profile inherit the settings from another port profile.

Inheriting another port profile allows the initial port profile to assume all of the commands of the second, inherited, port profile that do not conflict with the initial port profile. Four levels of inheritance are supported. The same port profile can be inherited by any number of port profiles. The system applies the commands inherited by the interface or range of interfaces according to the following guidelines:. However, the port profile retains that command in the port profile.