Re: %PLATFORM_ENV-3-LOOPBACK_PORT_POST_ERR:

bernard macharia · ‎08-02-2013

Hi all,

I have the above error appearing on my Cisco 3560E running Version 15.0(2) of the IOS. The port affected is Port 24; I've seen some previous discussions concerning a bug on Versions 12 of the IOS. I just need confirmation that this is not bug related; what's the next course of action? I have shutdown the port but the cannot bring it up; It remains administratively down. This happened several times in the past, any way to resolve the issue?

See more details below:

interface GigabitEthernet0/24

switchport trunk encapsulation dot1q

switchport mode trunk

shutdown

speed 100

duplex full

SWITCH#conf t

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

SWITCH(config)#int g0/24

SWITCH(config-if)#no shut

SWITCH(config-if)#do show int g0/24

GigabitEthernet0/24 is administratively down, line protocol is down (disabled)

Hardware is Gigabit Ethernet, address is 30f7.0d49.7b98 (bia 30f7.0d49.7b98)

SWITCH#sh log | i Gi0/24

Aug 2 10:23:34.005: %PLATFORM_ENV-3-LOOPBACK_PORT_POST_ERR: Gi0/24 can't be brought up because it failed POST in Loopback test.

Aug 2 10:24:01.946: %PLATFORM_ENV-3-LOOPBACK_PORT_POST_ERR: Gi0/24 can't be brought up because it failed POST in Loopback test.

Aug 2 10:25:08.850: %PLATFORM_ENV-3-LOOPBACK_PORT_POST_ERR: Gi0/24 can't be brought up because it failed POST in Loopback test.

Aug 2 11:24:17.156: %PLATFORM_ENV-3-LOOPBACK_PORT_POST_ERR: Gi0/24 can't be brought up because it failed POST in Loopback test.

SWITCH#sh ver

Cisco IOS Software, C3560E Software (C3560E-UNIVERSALK9-M), Version 15.0(2)SE, RELEASE SOFTWARE (fc1)

Technical Support: http://www.cisco.com/techsupport

Compiled Fri 27-Jul-12 23:45 by prod_rel_team

ROM: Bootstrap program is C3560E boot loader

BOOTLDR: C3560E Boot Loader (C3560X-HBOOT-M) Version 12.2(53r)SE2, RELEASE SOFTWARE (fc1)

Ivan Shirshin · ‎08-02-2013

Hi,

LOOPBACK_PORT_POST_ERR related bugs are fixed in 15.0(02)SE01 and later releases. Try one of those images and if the issue is still seen, then it is genuine HW issue.888

Kind Regards,
Ivan Shirshin

**Please grade this post if you find it useful.

Kind Regards,
Ivan

BTSC BTSC · ‎10-11-2014

try reloading the device it resolved the same issue for myself. seems to be a bug with c3560e-universalk9-mz.122-58.SE2.bin seen it on quite a few installs of recent

kconrad01 · ‎06-22-2021

We are well past that version and we have this error.

I reloaded the switch from cold boot. Still have issue.

Peter Paluch · ‎06-22-2021

Hello,

Sadly, in that case, the switch suffers from a hardware failure and there is nothing you can do about it. Since all support for the Catalyst 3560, 3560V2, -G and -E series switches has already ceased, there's no possibility to RMA it, either. I'm sincerely sorry to be bringing the bad news but it's sadly what it is.

Best regards,
Peter

izadsalman · ‎03-06-2020

i have problem with cisco switch 2960S 24 PSL and show me error as below:
%PLATFORM ENV-3-ILP PORT_POST_ERR: Gi1/0/2 can't be brought up because it failed POST Power test.
i grateful if you could help me to solved this problem.