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Link Flapping and Taken Down By Switch Due To Excessive Link State Changes

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TitleLink Flapping and Taken Down By Switch Due To Excessive Link State Changes
Symptoms
  • Port flapping and then taken down by switch software
1 2019-11-07T01:27:00.027Z VSP8600 CP1 - 0x002d060a - 00000000 GlobalRouter LLDP INFO LLDP Neighbor Deleted on interface 1/1
1 2019-11-07T01:26:23.413Z VSP8600 CP1 - 0x00000026 - 00000000 GlobalRouter SW INFO Port 1/1 is a trunk port
1 2019-11-07T01:26:23.413Z VSP8600 CP1 - 0x0000c5fa - 00300001.192 DYNAMIC SET GlobalRouter HW INFO Link Down(1/1) due to excessive link state changes
1 2019-11-07T01:26:23.413Z VSP8600 CP1 - 0x00004613 - 00000000 GlobalRouter SNMP INFO Link Oscillation(1/1)
1 2019-11-07T01:26:23.413Z VSP8600 CP1 - 0x0001c580 - 00000000 GlobalRouter HW WARNING port=1/1, link is unstable!
1 2019-11-07T01:26:22.860Z VSP8600 CP1 - 0x00000026 - 00000000 GlobalRouter SW INFO Port 1/1 is a trunk port
1 2019-11-07T01:26:22.859Z VSP8600 CP1 - 0x0000c5ec - 00300001.192 DYNAMIC CLEAR GlobalRouter HW INFO Link Up(1/1)
1 2019-11-07T01:26:22.465Z VSP8600 CP1 - 0x00000026 - 00000000 GlobalRouter SW INFO Port 1/1 is a trunk port
1 2019-11-07T01:26:22.465Z VSP8600 CP1 - 0x0000c5e7 - 00300001.192 DYNAMIC SET GlobalRouter HW INFO Link Down(1/1)
1 2019-11-07T01:26:17.310Z VSP8600 CP1 - 0x00000026 - 00000000 GlobalRouter SW INFO Port 1/1 is a trunk port
1 2019-11-07T01:26:17.310Z VSP8600 CP1 - 0x0000c5ec - 00300001.192 DYNAMIC CLEAR GlobalRouter HW INFO Link Up(1/1)
  • GBIC moved from port 1/1 to port 1/7 and link flapping stopped
  • Original port and new port show receive errors
VSP8600:1#show interfaces gigabitEthernet error verbose 1/1,1/7

====================================================================================================
                          Port Ethernet Error Extended
====================================================================================================
PORT  MAC_RX   MAC_TX   DEFER    PACKET   LINK     UNKNOWN
NUM   ERRORS   ERRORS   TX       ERRORS   INACTIV  PROTOS
----------------------------------------------------------------------------------------------------
1/1   1050     0        0        38597    0        0
1/7   878      0        0        50289    0        0

PORT  IN                   OUT                  IN                   OUT
NUM   FLWCTRL              FLWCTRL              PFC                  PFC
----------------------------------------------------------------------------------------------------
1/1   0                    0                    0                    0
1/7   0                    0                    0                    0
  • Remote end of link is x450G2 switch
Environment
  • VSP 8600
  • Any supported release
Cause
Bad GBIC on x450G2
Resolution
Replace GBIC on x450G2 switch
Additional notes

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