Deployment Guide

As shown in the above illustration, interface 3/41 is a backup interface for 3/42, and 3/42 is in the Down state. If 3/41 fails,
3/42 transitions to the Up state, which makes the backup link active. A message similar to the following message appears
whenever you configure a backup port.
02:28:04: %RPM0-P:CP %IFMGR-5-L2BKUP_WARN: Do not run any Layer2 protocols on Te 3/41
and Te 3/42
02:28:04: %RPM0-P:CP %IFMGR-5-OSTATE_DN: Changed interface state to down: Te 3/42
02:28:04: %RPM0-P:CP %IFMGR-5-STATE_ACT_STBY: Changed interface state to standby: te 3/42
Example of Configuring Redundant Layer 2 Pairs
DellEMC(conf-if-range-te-3/41-42)#switchport backup interface TenGigabitEthernet 3/42
DellEMC(conf-if-range-te-3/41-42)#show config
!
interface TenGigabitEthernet 3/41
no ip address
switchport
switchport backup interface TenGigabitEthernet 3/42
no shutdown
!
interface TenGigabitEthernet 3/42
no ip address
switchport
no shutdown
DellEMC(conf-if-range-te-3/41-42)#
DellEMC(conf-if-range-te-3/41-42)#do show ip int brief | find 3/41
TenGigabitEthernet 3/41 unassigned YES Manual up up
TenGigabitEthernet 3/42 unassigned NO Manual up down
[output omitted]
DellEMC(conf-if-range-te-3/41-42)#interface tengig 3/41
DellEMC(conf-if-te-3/41)#shutdown
00:24:53: %RPM0-P:CP %IFMGR-5-ASTATE_DN: Changed interface Admin state to down: Te 3/41
DellEMC(conf-if-te-3/41)#00:24:55: %RPM0-P:CP %IFMGR-5-OSTATE_DN: Changed interface
state to
down: Te 3/41
00:24:55: %RPM0-P:CP %IFMGR-5-INACTIVE: Changed Vlan interface state to inactive: Vl 1
00:24:55: %RPM0-P:CP %IFMGR-5-OSTATE_UP: Changed interface state to up: Te 3/42
00:24:55: %RPM0-P:CP %IFMGR-5-ACTIVE: Changed Vlan interface state to active: Vl 1
00:24:55: %RPM0-P:CP %IFMGR-5-STATE_STBY_ACT: Changed interface state from standby to active:
Te 3/42
DellEMC(conf-if-te-3/41)#do show ip int brief | find 3/41
TenGigabitEthernet 3/41 unassigned NO Manual administratively down down
TenGigabitEthernet 3/42 unassigned YES Manual up up
[output omitted]
Example of Configuring Redundant Pairs on a Port-Channel
DellEMC#show interfaces port-channel brief
Codes: L - LACP Port-channel
LAG Mode Status Uptime Ports
1 L2 up 00:08:33 Te 1/1 (Up)
2 L2 up 00:00:02 Te 2/1 (Up)
DellEMC#configure
DellEMC(conf)#interface port-channel 1
DellEMC(conf-if-po-1)#switchport backup interface port-channel 2
Apr 9 00:15:13: %STKUNIT0-M:CP %IFMGR-5-L2BKUP_WARN: Do not run any Layer2 protocols on
Po 1 and Po 2
Apr 9 00:15:13: %STKUNIT0-M:CP %IFMGR-5-OSTATE_DN: Changed interface state to down: Po 2
Apr 9 00:15:13: %STKUNIT0-M:CP %IFMGR-5-STATE_ACT_STBY: Changed interface state to
standby: Po 2
DellEMC(conf-if-po-1)#
DellEMC#
DellEMC#show interfaces switchport backup
Interface Status Paired Interface Status
Port-channel 1 Active Port-chato mannel 2 Standby
Port-channel 2 Standby Port-channel 1 Active
DellEMC#
DellEMC(conf-if-po-1)#switchport backup interface tengigabitethernet 1/2
504
Layer 2