E Commands

encapsulation dot1Q

To enable IEEE 802.1Q encapsulation of traffic on a specified subinterface in a virtual LAN (VLAN), use the encapsulation dot1q command. To disable encapsulation, use the no form of this command.

encapsulation dot1Q vlan-id

no encapsulation dot1Q vlan-id

Syntax Description

vlan-id

VLAN to set when the interface is in access mode; valid values are from 1 to 4093, except for the VLANs reserved for internal switch use.

Command Default

No encapsulation

Command Modes


Subinterface configuration mode

Command History

Release

Modification

5.2(1)N1(1)

This command was introduced.

Usage Guidelines

IEEE 802.1Q encapsulation is configurable on Ethernet and EtherChannel interfaces. IEEE 802.1Q is a standard protocol for interconnecting multiple switches and routers and for defining VLAN topologies.

Use the encapsulation dot1q command in subinterface range configuration mode to apply a VLAN ID to the subinterface.


Note
This command is not applicable to loopback interfaces.

This command does not require a license.

Examples

This example shows how to enable dot1Q encapsulation on a subinterface for VLAN 30: 


switch(config)# interface ethernet 1/5.1
 
switch(config-subif)# encapsulation dot1q 30
 
switch(config-subif)#

Related Commands

Command

Description

show vlan dot1Q

Displays dot1Q encapsulation information for a VLAN.

errdisable detect cause

To enable error-disable (err-disabled) detection in an application, use the errdisable detect cause command. To disable error disable detection, use the no form of this command.

errdisable detect cause { all | link-flap | loopback }

no errdisable detect cause { all | link-flap | loopback }

Syntax Description

all

Enables error detection on all cases.

link-flap

Enables error disable detection on linkstate-flapping.

loopback

Enables error disable detection on loopback.

Command Default

Enabled

Command Modes


Global configuration mode

Command History

Release

Modification

5.2(1)N1(1)

This command was introduced.

Usage Guidelines

When error disable detection is enabled and a cause is detected on an interface, the interface is placed in an err-disabled state, which is an operational state that is similar to the link-down state.

Examples

This example shows how to enable the err-disabled detection on linkstate-flapping: 


switch(config)# errdisable detect cause link-flap 
switch(config)#

Related Commands

Command

Description

errdisable recovery

Configures recovery from the err-disabled state.

show interface status err-disabled

Displays the interface error disabled state.

errdisable recovery cause

To configure the application to bring the interface out of the error-disabled (err-disabled) state and retry coming up, use the errdisable recovery cause command. To revert to the defaults, use the no form of this command.

errdisable recovery cause { all | bpduguard | failed-port-state | link-flap-recovery | pause-rate-limit | udld }

no errdisable recovery cause { all | bpduguard | failed-port-state | link-flap-recovery | pause-rate-limit | udld }

Syntax Description

all

Enables a timer to recover from all causes.

bpduguard

Enables a timer to recover from bridge protocol data unit (BPDU) Guard error disable state.

failed-port-state

Enables a timer to recover from a Spanning Tree Protocol (STP) set port state failure.

link-flap

Enables a timer to recover from linkstate flapping.

pause-rate-limit

Enables a timer to recover from the pause rate limit error disabled state.

udld

Enables a timer to recover from the Unidirectional Link Detection (UDLD) error disabled state.

Command Default

None

Command Modes


Global configuration mode

Command History

Release

Modification

5.2(1)N1(1)

This command was introduced.

Usage Guidelines

When error disable recovery is enabled, the interface automatically recovers from the err-disabled state, and the device retries bringing the interface up.

Examples

This example shows how to enable error disable recovery from linkstate-flapping: 


switch(config)# errdisable recovery cause link-flap 
switch(config)#

Related Commands

Command

Description

errdisable detect cause

Enables the error disabled (err-disabled) detection.

show interface status err-disabled

Displays the interface error disabled state.

errdisable recovery interval

To configure the recovery time interval to bring the interface out of the error-disabled (err-disabled) state, use the errdisable recovery interval command. To revert to the defaults, use the no form of this command.

errdisable recovery interval time

no errdisable recovery interval

Syntax Description

time

Error disable recovery time interval. The range is from 30 to 65535 seconds.

Command Default

Disabled

Command Modes


Global configuration mode

Command History

Release

Modification

5.2(1)N1(1)

This command was introduced.

Usage Guidelines

When error disable recovery is enabled, the interface automatically recovers from the err-disabled state, and the device retries bringing the interface up.

The device waits 300 seconds to retry.

Examples

This example shows how to enable error disable recovery time interval to 100 seconds: 


switch(config)# errdisable recovery interval 100
switch(config)#

Related Commands

Command

Description

errdisable recovery cause

Enables an error disabled recovery on an interface.

show interface status err-disabled

Displays the interface error disabled state.

erspan-id

To configure the flow ID for an Encapsulated Remote Switched Port Analyzer (ERSPAN)) session, use the erspan-id command. To remove the flow ID, use the no form of this command.

erspan-id flow_id

Syntax Description

flow_id

ERSPAN flow ID. The range is from 1 to 1023.

Command Default

None

Command Modes


ERSPAN session configuration mode

Command History

Release

Modification

5.2(1)N1(1)

This command was introduced.

Usage Guidelines

This command does not require a license.

Examples

This example shows how to configure the flow ID for an ERSPAN session: 


switch# configure terminal
switch(config)# monitor session 1 type erspan-source
switch(config-erspan-src)# erspan-id 100
switch(config-erspan-src)#

Related Commands

Command

Description

ip dscp

Configures the DSCP value of the packets in the ERSPAN traffic.

ip ttl

Configures the IP time-to-live (TTL) value of the ERSPAN traffic.

mtu

Sets the maximum transmission unit (MTU) size for SPAN packet.

vrf

Configures the VRF for ERSPAN traffic forwarding.

monitor-session

Enters the monitor configuration mode for configuring an ERSPAN or SPAN session for analyzing traffic between ports.

extension-key

To configure the extension key to be used to connect to the vCenter Server, use the extension-key command.

extension-key extn-ID

Syntax Description

extn-ID

Extension ID. The ID can be a maximum of 80 alphanumeric characters.

Command Default

None

Command Modes


SVS connection configuration mode

Command History

Release

Modification

5.2(1)N1(1)

This command was introduced.

Usage Guidelines

This command does not require a license.

Examples

This example shows how to configure the extension key for a vCenter Server: 


switch# configure terminal
switch(config)# svs connection SVSConn
switch(config-svs-conn)# extension-key vckey
switch(config-svs-conn)#

Related Commands

Command

Description

show svs connections

Displays SVS connection information.

svs connection

Enables an SVS connection.