Concept Guide

Conguring an automatic recovery for an Err-disabled
interface
To congure automatic Err-disabled recovery of an interface and time-out interval, use the following commands.
1 Congure automatic recovery of an interface from Err-disabled state based on the cause.
CONFIGURATION mode
errdisable recovery cause {bpduguard | fefd | maclearnlimit | arp-insection}
NOTE: This command has to be congured before the interface moves to Err-disabled state. If not, the recovery action
is not performed.
2 Congure the recovery time-out interval. You can enter the interval from the range of 30 to 86,400 seconds. The default is 300
seconds.
CONFIGURATION mode
errdisable recovery interval seconds
NOTE: In Dell EMC Networking OS, for optimal performance of FEFD, the best practice is to set the error disable
recover timer not exceeding 30 seconds with FEFD interval set to default. Thus, avoiding any potential interface ap
and overlapping of recovery timings causing the FEFD enabled interface to stay in error-disabled state for a longer
interval. However, this timer value need to be applied only if the FEFD error-disable mode is set to aggressive mode.
Whenever the Err-disable recovery timer is recongured, it will get eective only after the current timer expires. Following message is
displayed after each Err-disable recovery timer conguration:
DellEMC(conf)# errdisable recovery interval 30
New timer interval will be effective from the next timer instance only.
Example conguration for the recovery cause and the timer interval
Following is the sample steps to congure the recovery cause and the timer interval for automatic recovery of an interface.
DellEMC# configure termimal
DellEMC(conf)# errdisable recovery cause fefd
DellEMC(conf)# errdisable recovery interval 30
DellEMC(conf)#
Egress Interface Selection (EIS)
EIS allows you to isolate the management and front-end port domains by preventing switch-initiated trac routing between the two
domains. This feature provides additional security by preventing ooding attacks on front-end ports. The following protocols support EIS:
DNS, FTP, NTP, RADIUS, sFlow, SNMP, SSH, Syslog, TACACS, Telnet, and TFTP. This feature does not support sFlow on stacked units.
When you enable this feature, all management routes (connected, static, and default) are copied to the management EIS routing table. Use
the management route command to add new management routes to the default and EIS routing tables. Use the show ip
management-eis-route command to view the EIS routes.
Important Points to Remember
• Deleting a management route removes the route from both the EIS routing table and the default routing table.
• If the management port is down or route lookup fails in the management EIS routing table, the outgoing interface is selected based on
route lookup from the default routing table.
• If a route in the EIS table conicts with a front-end port route, the front-end port route has precedence.
424
Interfaces