ErrDisable for Storm-Control Configuration

OcNOS DC : Layer 2 Guide : Layer 2 Configuration : ErrDisable for Storm-Control Configuration

An interface port state becomes ErrDisable when it continuously receives BUM traffic which is discarded due to storm control settings. Consequently, the port is down and does not allow or receive any traffic. The ErrDisable state is changed either manually by shut/no shut the interface or automatically through setting timeout value.

Note:

• An interface discards BUM traffic during the specified interval to complete one discard-hit cycle.

• The LED does not glow when an interface is in the ErrDisable state.

• ErrDisable is supported only on physical interfaces.

• A LAG interface does not go into the ErrDisable state when all of its member ports are in the ErrDisable state

• The error disable computation is based on a sliding window of time. The window size is configurable in seconds. This window is taken as the current time to the last <t> second, where <t> is the configured window size. Every 5 seconds, a discard hit count increases if there is BUM traffic being discarded in that period. If the accumulated discard hit count reaches the maximum count for a particular configurable sliding window, a storm control error disable fault is triggered.

Topology

ErrDisable

Automatic Recovery

By default, an interface goes into the ErrDisable state when there is 1 discard hit in 5 seconds. An interface is recovered from the ErrDisable state when the configured non-zero errdisable time-out interval value expires.

RTR1

#configure terminal	Enter configure mode.
(config)#errdisable cause storm-control	Enable ErrDisable due to storm-control
(config)#errdisable storm-control discard-hit 2 time 30	Configure Storm control settings. Max discard hit count and interval for stormControl Timer
(config)#errdisable timeout interval 50	Configure interval to recover from error disable state
(config)#commit	Commit the candidate configuration to the running configuration.
(config)#exit	Exit interface mode

Note: Automatic recovery timeout is disabled, if you configure errdisable timeout interval 0 .

Validation

#show errdisable details

Storm Control Timer Interval : 30 secs

Storm Control allowed Max. discard-hit count : 2

ErrDisable Cause Status

---------------- ------

Link-Flap Disabled

Storm-Control Enabled

Lag-Mismatch Disabled

Stp-Bpdu-Guard Enabled

Mac-move-limit Disabled

Note: Stp-Bpdu-Guard is enabled by default on the global level configuration.

#show interface errdisable status

Interfaces that will be enabled at the next timeout

Interface ErrDisable Cause Time left(secs)

--------- ---------------- ---------------

xe11 storm-control 38

#show interface brief | include ED

ED - ErrDisabled, PD - Protocol Down, AD - Admin Down, IA - InActive

xe11 ETH -- -- down ED 10g -- No No

Note: Interface xe11 went into the ErrDisable state after discarding packets 2 times (5 second windows are considered) in 30 seconds.

Log Message

Edge1-SiteX#configure terminal	Enter configure mode.
Edge1-SiteX(config)#logging level nsm 4	Enable Operational log to display recovery message
Edge1-SiteX(config)#commit	Commit the candidate configuration to the running configuration.
Edge1-SiteX(config)#exit	Exit interface mode

2017 Sep 18 11:52:12 : NSM : CRITI : [IFMGR_IF_DOWN_2]: Interface xe11 changed state to down

(config-if)#no shut

(config-if)#2017 Sep 18 11:52:15 : NSM : CRITI : [IFMGR_IF_UP_2]: Interface xe11 changed state to up

2017 Sep 18 11:52:15 : NSM : WARN : [VXLAN_OPR_ACCESSPORT_UP_4]: VXLAN Access port on xe11 is up

2017 Sep 18 11:52:15 : NSM : CRITI : [IFMGR_ERstorm-controlR_DISABLE_DOWN_2]: Interface xe11 moved to errdisable state due to storm-control

2017 Sep 18 11:52:15 : NSM : CRITI : [IFMGR_IF_DOWN_2]: Interface xe11 changed state to down

Note: Interface xe11 recovered from the ErrDisable state after a 50 second time-out.

Manual Recovery

An interface can be recovered manually from the ErrDisable state, by executing the CLIS shutdown which recovers the interface from ErrDisable state, followed by no shutdown that brings the interface to an up state.

RTR1

#configure terminal	Enter configure mode.
(config)#errdisable cause storm-control	Enable errdisable due to storm-control
(config)#errdisable storm-control discard-hit 3 time 20	Configure Storm control settings. Max discard hit count and interval for StormControl Timer
(config)#commit	Commit the candidate configuration to the running configuration.
(config)#exit	Exit interface mode

Validation

#show running-config | include errdisable

errdisable cause storm-control

errdisable storm-control-setting max-flaps 3 time 20

errdisable cause stp-bpdu-guard

#show errdisable details

Link Flap Timer Interval : 20 secs

Link Flaps allowed Max. count : 3

ErrDisable Cause Status

---------------- ------

Link-Flap Disabled

Storm-Control Enabled

Lag-Mismatch Disabled

Stp-Bpdu-Guard Disabled

Mac-move-limit Disabled

Note: Interface xe11 went into the ErrDisable state after discarding packets 3 times (5 second windows are considered) in 20 seconds.

(config)#do show interface errdisable status

Interfaces that will be enabled at the next timeout

Interface ErrDisable Cause Time left(secs)

--------- ---------------- ---------------

xe11 storm-control NA

(config)#do show int brief | include ED

ED - ErrDisabled, PD - Protocol Down, AD - Admin Down, IA - InActive

xe11 ETH -- -- down ED 10g -- No No

Note: Interface xe11 recovered from the ErrDisable state after entering shutdown followed by no shutdown.

(config)#interface xe11

(config-if)#shutdown

2017 Sep 18 13:02:20 : NSM : WARN : [IFMGR_ERR_DISABLE_UP_4]: Interface xe11 recovered from storm-control errdisable

(config-if)#no shut

(config-if)#2017 Sep 18 13:02:21 : NSM : CRITI : [IFMGR_IF_UP_2]: Interface xe11 changed state to up

2017 Sep 18 13:02:21 : NSM : WARN : [VXLAN_OPR_ACCESSPORT_UP_4]: VXLAN Access port on xe11 is up

config)#do show interface errdisable

(config)#do show interface brief | include ED

ED - ErrDisabled, PD - Protocol Down, AD - Admin Down, IA - InActive

(config)#

If you configure no errdisable cause storm-control, at the global level, it recovers all the interfaces from the ErrDisable state

Errdisable at the Interface Level

If you enable errdisable globally, by default all physical interfaces enable storm-control errdisable. To turn off errdisable for an interface, configure the commands below.

#configure terminal	Enter configure mode.
(config)#interface xe11	Enter into interface level
(config-if)#no storm-control errdisable	Disable storm-control errdisable for interface
(config)#commit	Commit the candidate configuration to the running configuration.
(config)#exit	Exit interface mode

Note: If you configure “no storm-control errdisable” in interface level, either it won’t allow the interface move to errdisable state or it will recover interface from errdisable state

Validation

#show run int xe11

interface xe11

description *1/2 member of PO3 - Connected to IXIA 6/6*

channel-group 3 mode active

no storm-control errdisable

Sample show running-config Output

Global level configuration

ocnos#

ocnos#con t

Enter configuration commands, one per line. End with CNTL/Z.

ocnos(config)#

ocnos(config)#errdisable cause storm-control

ocnos(config)#commit

ocnos(config)#end

ocnos#

ocnos#show errdisable details

Storm Control Timer Interval : 5 secs

Storm Control Max. discard-hit count : 1

ErrDisable Cause Status

---------------- ------

Link-Flap Disabled

Storm-Control Enabled

Lag-Mismatch Disabled

Stp-Bpdu-Guard Enabled

Mac-move-limit Disabled

ocnos#

ocnos#show running-config | include err

errdisable cause storm-control

errdisable cause stp-bpdu-guard

ocnos#

ocnos(config)#no errdisable cause storm-control

ocnos(config)#commit

ocnos(config)#end

ocnos#

ocnos#show running-config | include err

errdisable cause stp-bpdu-guard

Interfcae level configuration

ocnos#

ocnos(config)#

ocnos(config)#errdisable cause storm-control

ocnos(config)#commit

ocnos(config)#end

ocnos#

Enter configuration commands, one per line. End with CNTL/Z.

ocnos(config)#

ocnos(config)#interface ce21

ocnos(config-if)#no in

ocnos(config-if)#no storm-control errdisable

ocnos(config-if)#commit

ocnos(config-if)#ssto

ocnos(config-if)#storm-control errdisable

ocnos(config-if)#commit

ocnos(config-if)#end

ocnos#

ocnos#show running-config interface ce21

interface ce21

storm-control errdisable

ocnos#

ocnos#show running-config | include err

errdisable cause storm-control

errdisable cause stp-bpdu-guard

ocnos#

ocnos#con t

Enter configuration commands, one per line. End with CNTL/Z.

ocnos(config)#

ocnos(config)#no sto

ocnos(config)#no errdisable et

ocnos(config)#no errdisable cause storm-control

ocnos(config)#commit

ocnos(config)#end

ocnos#

ocnos#show running-config | include err

errdisable cause stp-bpdu-guard

ocnos#

Discardhit configuration

ocnos#

ocnos#con t

Enter configuration commands, one per line. End with CNTL/Z.

ocnos(config)#errdisable cause storm-control

ocnos(config)#commit

ocnos(config)#end

ocnos#

ocnos#show running-config | include err

errdisable cause storm-control

errdisable cause stp-bpdu-guard

ocnos#

ocnos#con t

Enter configuration commands, one per line. End with CNTL/Z.

ocnos(config)#errdisable storm-control discard-hit 3 time 30

ocnos(config)#commit

% Warning: Err-disable setting has being updated, previous flaps won't be considered

ocnos(config)#end

ocnos#

ocnos#show running-config | include err

errdisable cause storm-control

errdisable cause stp-bpdu-guard

errdisable storm-control discard-hit 3 time 30

ocnos#

ocnos#con t

Enter configuration commands, one per line. End with CNTL/Z.

ocnos(config)#no errdisable cause storm-control

ocnos(config)#commit

ocnos(config)#end

ocnos#

ocnos#show running-config | include err

errdisable cause stp-bpdu-guard

ocnos#

Time interval Comnfiguration

ocnos#con t

Enter configuration commands, one per line. End with CNTL/Z.

ocnos(config)#errdisable to

ocnos(config)#errdisable timeout interval 10

ocnos(config)#commit

ocnos(config)#end

ocnos#

ocnos#show running-config | include err

errdisable cause stp-bpdu-guard

errdisable timeout interval 10

ocnos#

ocnos#con t

Enter configuration commands, one per line. End with CNTL/Z.

ocnos(config)#no errdisable timeout im

ocnos(config)#no errdisable timeout interval

ocnos(config)#commit

ocnos(config)#end

ocnos#

ocnos#show running-config | include err

errdisable cause stp-bpdu-guard

ocnos#

ocnos#con t

Enter configuration commands, one per line. End with CNTL/Z.

ocnos(config)#errdisable timeout interval 50

ocnos(config)#commit

ocnos(config)#end

ocnos#

ocnos#show running-config | include err

errdisable cause stp-bpdu-guard

errdisable timeout interval 50

ocnos#

ocnos#con t

Enter configuration commands, one per line. End with CNTL/Z.

ocnos(config)#

ocnos(config)#no errdisable timeout im

ocnos(config)#no errdisable timeout interval

ocnos(config)#commit

ocnos(config)#end

ocnos#

ocnos#show running-config | include err

errdisable cause stp-bpdu-guard

ocnos#