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VSP Port Flapping After VLACP On ERS Takes Port Down

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TitleVSP Port Flapping After VLACP On ERS Takes Port Down
Symptoms
  • ERS port taken down by VLACP which connects to VSP
I    2    2019-10-23T17:04:37-04:00     39       Port 2/50 blocked by VLACP until end-partner connection reestablished
  • VSP port then starts to flap and continues until the VSP switch was rebooted to recover
CP1 [10/19/19 21:44:58.444:EDT] 0x000ec5ce 04f00001.205 DYNAMIC SET GlobalRouter LACP WARNING trapSendVlacpLinkDown: Vlacp Link 1/14 is down
CP1 [10/19/19 21:44:58.445:EDT] 0x00000009 01900001.114 DYNAMIC SET GlobalRouter SW INFO SMLT 114 Link is DOWN
CP1 [10/19/19 21:44:58.445:EDT] 0x0000461a 01900001 DYNAMIC SET GlobalRouter SNMP INFO Smlt Link Down Trap(SmltId=114)
CP1 [10/19/19 21:45:03.192:EDT] 0x000ec5d4 00000000 GlobalRouter LACP WARNING Remote Vlacp port status is down; bringing current port 1/15 status down.
CP1 [10/19/19 21:45:03.193:EDT] 0x00000009 01900001.115 DYNAMIC SET GlobalRouter SW INFO SMLT 115 Link is DOWN
CP1 [10/19/19 21:45:03.194:EDT] 0x0000461a 01900001 DYNAMIC SET GlobalRouter SNMP INFO Smlt Link Down Trap(SmltId=115)
CP1 [10/19/19 21:45:03.196:EDT] 0x000ec5ce 04f00001.206 DYNAMIC SET GlobalRouter LACP WARNING trapSendVlacpLinkDown: Vlacp Link 1/15 is down
CP1 [10/19/19 21:45:03.251:EDT] 0x0000000a 01900001.115 DYNAMIC CLEAR GlobalRouter SW INFO SMLT 115 Link is UP
CP1 [10/19/19 21:45:03.254:EDT] 0x00004619 01900001 DYNAMIC CLEAR GlobalRouter SNMP INFO Smlt Link Up Trap(SmltId=115)


 
Environment
  • ERS 4900 release 7.6.1.205
  • VSP 8400 release 7.1.1.0
Cause
  • VLACP timeout mismatch
  • VLACP timeout set to long on VSP
  • VLACP timeout set to short on ERS
Resolution
Set VLACP timeout on VSP ports to short
  1. Type enable
  2. Type config term
  3. Type interface gigabit <PORT_#>
  4. Type vlacp timeout short
Additional notes

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