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What commands should I run when troubleshooting link fault signaling (LFS) on the XMR / MLX / MLXe?

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TitleWhat commands should I run when troubleshooting link fault signaling (LFS) on the XMR / MLX / MLXe?
Question
What commands should I run when troubleshooting link fault signaling (LFS) on the XMR / MLX / MLXe?
Environment
  • NetIron OS version 5.0.00x and later codes
Answer

Commands to run:

1. Run show log to confirm if you are experiencing local faults or remote faults and on which ports.

telnet@MLX# show log
Syslog logging: enabled (0 messages dropped, 0 flushes, 4366 overruns)
Buffer logging: level ACDMEINW, 1000 messages logged
level code: A=alert C=critical D=debugging M=emergency E=error
I=informational N=notification W=warning

Static Log Buffer:
Sep 19 17:40:19:A:System: Power Supply 1 , 1st from left (top row), Installed (Failed or Disconnected)
Sep 20 00:40:11:A:System: AC Power Supply 2 , 2nd from left (top row), Installed (OK)
Sep 20 00:40:11:A:System: AC Power Supply 3 , 3rd from left (top row), Installed (OK)
Sep 20 00:40:11:A:System: AC Power Supply 4 , 4th from left (top row), Installed (OK)

Dynamic Log Buffer (1000 lines):
Sep 29 22:29:46:I:Security: running-config was changed by operator from telnet client 10.110.33.11
Sep 29 22:23:24:I:Security: startup-config was changed by operator from telnet client 10.110.33.11
Sep 29 22:23:23:I:Security: running-config was changed by operator from telnet client 10.110.33.11
Sep 29 22:22:43:I:Security: telnet login from src IP 10.110.33.11 to USER EXEC mode
Sep 29 05:43:54:I:Security: telnet logout from src IP 10.110.33.13 from USER EXEC mode
Sep 28 19:20:42:I:Security: telnet logout from src IP 10.110.34.134 from USER EXEC mode
Sep 28 17:36:36:I:Security: telnet logout from src IP 10.110.34.178 from USER EXEC mode
Sep 28 17:36:05:I:System: Interface ethernet 6/3, state up
Sep 28 17:36:05:I:System: Interface ethernet 6/1, state up
Sep 28 17:36:02:I:System: Interface ethernet 6/1, state down - link down
Sep 28 17:36:02:I:System: Interface ethernet 6/3, state down - local fault
Sep 28 17:36:02:I:SYSTEM: port 6/3 is down( local fault)
Sep 28 16:48:33:N:BGP: Peer 11.249.0.7 UP (ESTABLISHED)
Sep 28 16:48:32:N:OSPF: interface state changed, rid 11.249.0.1, intf addr 11.248.0.198, state backup designated router
Sep 28 16:48:32:N:OSPF: nbr state changed, rid 11.249.0.1, nbr addr 11.248.0.193, nbr rid 11.249.0.7, state full
Sep 28 16:48:31:N:OSPF: interface state changed, rid 11.249.0.1, intf addr 11.248.0.198, state other designated router
Sep 28 16:47:52:I:PIM Neighbor on interface 3/2 is UP.
Sep 28 16:47:51:I:System: Interface ethernet 3/2, state up
Sep 28 16:46:29:I:PIM Neighbor on interface 3/2 is lost.
Sep 28 16:46:29:N:OSPF: interface state changed, rid 11.249.0.1, intf addr 11.248.0.198, state down
Sep 28 16:46:29:N:OSPF: nbr state changed, rid 11.249.0.1, nbr addr 11.248.0.193, nbr rid 11.249.0.7, state down
Sep 28 16:46:29:I:System: Interface ethernet 3/2, state down - link down
Sep 28 12:51:26:I:System: Interface ethernet 6/5, state down - remote fault
Sep 28 12:51:26:I:SYSTEM: port 6/5 is down( remote fault)

2. Run show run | incl link-fault-signaling  to see how LFS is configured globally and on the interfaces.

telnet@MLX# show run | incl link-fault-signaling
link-fault-signaling

3. Run show link-fault-signaling to check LFS status globally and on the interfaces.

telnet@MLX# show link-fault-signaling
Global Link Fault : RX ON TX ON
PORT #: LINK FAULT:
PORT 3/1: RX ON TX ON
PORT 3/2: RX ON TX ON
PORT 3/3: RX ON TX ON
PORT 3/4: RX ON TX ON
PORT 6/1: RX ON TX ON
PORT 6/2: RX ON TX ON
PORT 6/3: RX ON TX ON
PORT 6/4: RX ON TX ON
PORT 6/5: RX ON TX ON
PORT 6/6: RX ON TX ON
PORT 6/7: RX ON TX ON
PORT 6/8: RX ON TX ON

4. Run show interface e <SLOT_#>/<PORT_#>  to check the interface status of an affected port.

telnet@MLX# show interface e 6/5
10GigabitEthernet6/5 is down(remote fault), line protocol is down
  STP Root Guard is disabled, STP BPDU Guard is disabled
  Hardware is 10GigabitEthernet, address is 0024.387a.f200 (bia 0024.387a.f2f4)
  Configured speed 10Gbit, actual unknown, configured duplex fdx, actual unknown
  Member of Control VLAN 4095, 5 L2 VLAN(S) (tagged), port is in tagged mode, port state is Disabled
  STP configured to ON, Priority is level0, flow control enabled
  Priority force disabled, Drop precedence level 0, Drop precedence force disabled
  dhcp-snooping-trust configured to OFF
  mirror disabled, monitor disabled
  LACP BPDU Forwarding:Disabled
  LLDP BPDU Forwarding:Disabled
  Not member of any active trunks
  Not member of any configured trunks
  No port name
  Port is not enabled to receive all vlan packets for pbr
  MTU 1548 bytes, encapsulation ethernet
  Openflow: Disabled, Openflow Index 245
  Cluster L2 protocol forwarding enabled
  300 second input rate: 0 bits/sec, 0 packets/sec, 0.00% utilization
  300 second output rate: 0 bits/sec, 0 packets/sec, 0.00% utilization
  219386742693 packets input, 28081497612916 bytes, 0 no buffer
  Received 0 broadcasts, 134203 multicasts, 219386608490 unicasts
  38 input errors, 38 CRC, 0 frame, 0 ignored
  0 runts, 0 giants
  NP received 219388762100 packets, Sent to TM 219388762094 packets
  NP Ingress dropped 0 packets
  0 packets output, 0 bytes, 0 underruns
  Transmitted 0 broadcasts, 0 multicasts, 0 unicasts
  0 output errors, 0 collisions
  NP transmitted 0 packets, Received from TM 0 packets

5. Run show statistics e <SLOT_#>/<PORT_#>  to check for errors on the interface.

telnet@MLX# show stat e 6/5
PORT 6/5 Counters:
         InOctets     28081497612916           OutOctets                  0
           InPkts       219386742731             OutPkts                  0
  InBroadcastPkts                  0    OutBroadcastPkts                  0
  InMulticastPkts             134203    OutMulticastPkts                  0
    InUnicastPkts       219386608490      OutUnicastPkts                  0
       InDiscards                  0         OutDiscards                  0
         InErrors                 38           OutErrors                  0
     InCollisions                  0       OutCollisions                  0
                                       OutLateCollisions                  0
        Alignment                  0                 FCS                 38
        GiantPkts                  0           ShortPkts                  0
     InBitsPerSec                  0       OutBitsPerSec                  0
     InPktsPerSec                  0       OutPktsPerSec                  0
    InUtilization               0.0%      OutUtilization               0.0%

6. Run show local-fault to check the local fault counters on all interfaces (clear local-fault will clear these counters).

telnet@MLX# show local-fault
 Port  Local Fault Detected  Local-fault count  Time last Local Fault detected
-----  --------------------  -----------------  ------------------------------
  3/1      no                          0                        -
  3/2      no                          0                        -
  3/3      no                          0                        -
  3/4      no                          0                        -
  6/1      no                          0                        -
  6/2      no                          0                        -
  6/3      no                          1            Sep 28 17:36:02
  6/4      yes                   1455266            Sep 28 12:51:26
  6/5      no                          0                        -
  6/6      no                          0                        -
  6/7      no                          0                        -
  6/8      no                          0                        -

7. Run show remote-fault to check the remote fault counters on all interfaces (clear remote-fault will clear these counters).

telnet@MLX# show remote-fault
 Port   RFN Detected   Remote-fault count        time last RFN detected
------  ------------   ------------------     ----------------------------
  3/1        no                  0                        -
  3/2        no                  0                        -
  3/3        no                  0                        -
  3/4        no                  0                        -
  6/1        no                  0                        -
  6/2        no                  0                        -
  6/3        no                  0                        -
  6/4        no                  0                        -
  6/5        yes                 1               Sep 28 12:51:26
  6/6        no                  0                        -
  6/7        no                  0                        -
  6/8        no                  0                        -
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