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Interface FC down - Isolation due to ELP failure

Hi,

I have a N5K-C5548UP, which is connected to an IBM SAN switch (IBM switch configured as AG mode, or something like port extender without zoning), with ports fc1/29-30. Recently I received the following syslog message for both ports:

 

fc1/29

09:51:04 %PORT-5-IF_DOWN_LINK_FAILURE: %$VSAN 1300%$ Interface fc1/29 is down (Link failure loss of signal)
09:51:04 %PORT-5-IF_DOWN_LINK_FAILURE: %$VSAN 1300%$ Interface fc1/29 is down (Link failure loss of signal)
09:52:45 %PORT-5-IF_DOWN_ELP_FAILURE_ISOLATION: %$VSAN 1300%$ Interface fc1/29 is down (Isolation due to ELP failure)

 

fc1/30

09:51:04 PORT-5-IF_DOWN_LINK_FAILURE: %$VSAN 1300%$ Interface fc1/30 is down (Link failure loss of signal)
09:51:04 PORT-5-IF_DOWN_LINK_FAILURE: %$VSAN 1300%$ Interface fc1/30 is down (Link failure loss of signal)
09:52:45 PORT-5-IF_DOWN_ELP_FAILURE_ISOLATION: %$VSAN 1300%$ Interface fc1/30 is down (Isolation due to ELP failure)

 

The status of the ports appears as Isolated.

 

Screenshot_3.png

 

In this link I found the system message, but I can't identify what is the problem, and how to solve it.

 

Error Message PORT-5-IF_DOWN_ELP_FAILURE_ISOLATION: Interface [chars] is down (Isolation due to ELP failure) [chars] [chars]

Explanation ELP failed on the interface. [optionally if the port belongs to port-channel, the port-channel number to which the port belongs will be displayed and if interface description is configured, the interface description is displayed]

Recommended Action Check the output of showportinternalinfo'inthe'ELPfailurereason'field'

 

Something curious is that the port keeps sending / receiving frames.

 

show int fc 1/29
fc1/29 is down (Isolation due to ELP failure)
Hardware is Fibre Channel, SFP is short wave laser w/o OFC (SN)
Port WWN is 20:1d:00:2a:6a:4c:26:c0
Admin port mode is auto, trunk mode is on
snmp link state traps are enabled
Port vsan is 1300
Receive data field Size is 2112
Beacon is turned off
1 minute input rate 1070072 bits/sec, 133759 bytes/sec, 95 frames/sec
1 minute output rate 3112952 bits/sec, 389119 bytes/sec, 244 frames/sec
12873374040 frames input, 4764855899948 bytes
0 discards, 0 errors
0 CRC, 0 unknown class
0 too long, 0 too short
371633177628 frames output, 748487499438148 bytes
0 discards, 0 errors
0 input OLS, 0 LRR, 0 NOS, 0 loop inits
1 output OLS, 1 LRR, 1 NOS, 0 loop inits
last clearing of "show interface" counters Fri Jan 22 15:56:52 2021

 

The following text is the output of the command show port internal info interface fc 1/29

 

# show port internal info interface fc 1/29
fc1/29 - if_index: 0x0101C000, phy_port_index: 0x1c
local_index: 0xffff
Admin Config - state(up), mode(auto), speed(auto), trunk(on)
beacon(off), snmp trap(on), tem(false)
rx bb_credit(default), rx bb_credit multiplier(default)
rx bb_credit performance buffers(default)
bb scn config(on)
speed group(NA)
ignore flags (ignore:none), service state(in service)
rxbufsize(2112), encap(default), user_cfg_flag(0x1)
description()
port owner()
admin rate-mode(default) port act license(eligible)
congestion drop timeout mode F (358), congestion drop timeout mode E (358)
no-credit-force mode F enable (0), no-credit-force mode F timeout (500)
no-credit-force mode E enable (0) no-credit-force mode E timeout (500)
admin port fill-pattern (IDLE)
Link failure syslog level (5)
Link failure syslog level = 5
Port guard info -
link failure state (disabled, 4) nt 0, dur 0
tsv state (disabled, 4) nt 0, dur 0
bit error state (disabled, 2) nt 0, dur 0
sig loss state (disabled, 2) nt 0, dur 0
sync loss state (disabled, 2) nt 0, dur 0
link reset state (disabled, 2) nt 0, dur 0
credit loss state (disabled, 2) nt 0, dur 0
Operational Info - state(down), mode(E), speed(4 Gbps), trunk(off)
32-bit state reason(17,17 - Isolation due to ELP failure), state reason(17,17 - Isolation due to ELP failure)
phy port enable (1), phy layer (FC), port_rate_mode(dedicated)
participating(1), fcid(0x000000), bb_scn(0)
cached rate mode(Unknown(0))
config port vsan (1300), oper port vsan (1300)
rx bb_credit(16), rx bb_credit multiplier(0)
rx bb_credit performance buffers(0), tx bb_credit(0)
not first time port bringup is 1
Port WWN is 20:1d:00:2a:6a:4c:26:c0
current state [PI_FSM_ST_NON_TRUNK_PORT_ISOLATED_ELP_ESC]
port_init_eval_flag(0x00000001), cfg wait for none
FC_PORT_INIT_DATA_VALID (0)
FC_PORT_INIT_ELP_SENT_WITH_PVSAN_SW_WWN (35)
Mts node id 0x102
Lock Info: resource [fc1/29]
type[0] p_gwrap[(nil)]
FREE @ 555714 usecs after Wed Oct 27 09:51:04 2021
type[1] p_gwrap[(nil)]
FREE @ 918288 usecs after Sat Feb 16 09:35:27 2019
type[2] p_gwrap[(nil)]
FREE @ 200383 usecs after Sat Feb 16 09:35:24 2019
0x10000000101c000
eport_init_flag(0x0000000A), elp_chk_flag(0x00040004)
elp_rcvd_fc2_handle(0x00000000), elp_sent_fc2_handle(0x08001F5E)
esc_chk_flag(0x00000000), esc_fc2_handle(0x00000000)
elp_flags(0x0000), classes_supported(F), tx bb_credit(0)
Peer ELP Revision: 3
cnt_link_failure(1), cnt_link_success(2), cnt_port_up(1)
cnt_cfg_wait_timeout(0), cnt_port_cfg_failure(0), cnt_init_retry(0)
nos link failures (0), debounce window (300 ms), elp wait tout (750 ms)
link fail reason (0x0) num_elps_before_up (0)
internal_reinit_counter (0) external_reinit_counter (0)
last_max_reinit_reach_time (n/a, 0)
Port Capabilities -
Modes: E,TE,F,SD
Min Speed: 1000
Max Speed: 8000
Max Sourcable Pkt Size: 0
Max Tx Bytes: 2112
Max Rx Bytes: 2112
Max Tx Buffer Credit: 64
Rx Buffer Credit in FRM mode: Min(1), Max(240), Default(16)
Rx Buffer Credit in OSM mode: Min(0), Max(0), Default(0)
Rx Buffer Credit(ISL) in FRM mode: Min(1), Max(240), Default(16)
Rx Buffer Credit(ISL) in OSM mode: Min(0), Max(0), Default(0)
Rx Buffer Credit Multiplier in FRM mode: Min(0), Max(0), Default(0)
Rx Buffer Credit Multiplier in OSM mode: Min(0), Max(0), Default(0)
Rx Buffer Credit Multiplier(ISL) in FRM mode: Min(0), Max(0), Default(0)
Rx Buffer Credit Multiplier(ISL) in OSM mode: Min(0), Max(0), Default(0)
Rx Buffer Credit performance buffers in FRM mode: Min(1), Max(0), Default(0)
Rx Buffer Credit performance buffers in OSM mode: Min(1), Max(0), Default(0)
Rx Buffer Credit performance buffers(ISL) in FRM mode: Min(1), Max(0), Default(0)
Rx Buffer Credit performance buffers(ISL) in OSM mode: Min(1), Max(0), Default(0)
Rx Buffer Credit change allowed in FRM mode, not allowed in OSM mode
Rx Buffer Credit performance buffer change not allowed in FRM mode, not allowed in OSM mode
Port rate mode change not allowed
BB_SCN processing not supported
Max BB_SCN 0
Max Private Devices: 0
Hw Capabilities: 0x100
Connector Type: 0x1
On demand port activation license is not supported
VF tagging not capable
first flogi from hba (00:00:00:00:00:00:00:00)
epp fc2 service (EPP_SERVICE_SWILS)
is delayed trap timer active (0)
Slowdrain capable
Port guard info -
link failure ed FALSE, oper cnt 0 ts (n/a 0)
tsv state ed FALSE, oper cnt 0 ts (n/a 0)
bit error state ed FALSE, oper cnt 0 ts (n/a 0)
sig loss state ed FALSE, oper cnt 0 ts (n/a 0)
sync loss state ed FALSE, oper cnt 0 ts (n/a 0)
link reset state ed FALSE, oper cnt 0 ts (n/a 0)
credit loss state ed FALSE, oper cnt 0 ts (n/a 0)
speed group convertible: 0x00 ( )
SFP Initializing:0
SFP info -
Min Speed: 2000
Max Speed: 8000
Module Type: 8
Connector Type: 7
Gigabit Eth Compliance Codes: 0
Diagmontype = 0x68
FC Transmitter Type: Shortwave Laser(3)
Vendor Name: CISCO-AVAGO
Vendor ID: 0:23:106
Vendor Part Num: SFBR-5780AMZ-CS2
Vendor Revision Level: G4.1
Trunk Info -
trunk vsans (allowed active) (1,1300)
Pacer Info -
Pacer state: released credits
RNID info not found.
PQP: not in progress

How I can solve this problem?

Best regards.

1 ACCEPTED SOLUTION

Accepted Solutions

interface shut no shut solve the problem.

View solution in original post

1 REPLY 1

interface shut no shut solve the problem.