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Strange STP issue - not sure what I am looking at

[ Edited ]
‎11-24-2014 03:30 PM

We have a EX4200 stack (v12.3R3.4) of 9 units.  It's basically a big stack for a VOIP call center.  We've been having this issue where VOIP units are resetting because the port appears to be going down.  I'm digging through logs and lo and behold I discover a whole bunch of these log events:

 

Nov 24 12:45:30  TXCC-EX4200-VC-2 eswd[1373]: ESWD_STP_STATE_CHANGE_INFO: STP state for interface ge-4/0/13.0 context id 0 changed from BLOCKING to LEARNING
Nov 24 12:45:30  TXCC-EX4200-VC-2 eswd[1373]: ESWD_STP_STATE_CHANGE_INFO: STP state for interface ge-4/0/13.0 context id 0 changed from LEARNING to FORWARDING
Nov 24 12:45:44  TXCC-EX4200-VC-2 eswd[1373]: ESWD_STP_STATE_CHANGE_INFO: STP state for interface ge-4/0/13.0 context id 0 changed from FORWARDING to BLOCKING

 

 

For all sorts of interfaces specifically for fpc4.  So I'm thinking this has to be a STP configuration issue or something.  The root bridge is currently:

 

> show spanning-tree bridge 

STP bridge parameters 
Context ID                          : 0
Enabled protocol                    : RSTP
  Root ID                           : 32768.3c:8a:b0:d1:67:01
  Hello time                        : 2 seconds
  Maximum age                       : 20 seconds
  Forward delay                     : 15 seconds
  Message age                       : 0 
  Number of topology changes        : 0
  Local parameters 
    Bridge ID                       : 32768.3c:8a:b0:d1:67:01
    Extended system ID              : 0
    Internal instance ID            : 0

 But when I look through the MAC addresses of the virtual chassis, nothing has that MAC address:

 

> show chassis mac-addresses                              
    FPC 0   MAC address information:
      Public base address     3c:8a:b0:d1:67:00
      Public count            128
    FPC 1   MAC address information:
      Public base address     3c:8a:b0:d1:95:80
      Public count            128
    FPC 2   MAC address information:
      Public base address     3c:8a:b0:d2:99:80
      Public count            128
    FPC 3   MAC address information:
      Public base address     3c:8a:b0:d2:bb:00
      Public count            128
    FPC 4   MAC address information:
      Public base address     3c:8a:b0:d1:35:00
      Public count            128
    FPC 5   MAC address information:
      Public base address     3c:8a:b0:d2:a3:00
      Public count            128
    FPC 6   MAC address information:
      Public base address     3c:8a:b0:d0:dd:00
      Public count            128
    FPC 7   MAC address information:
      Public base address     3c:8a:b0:d2:83:00
      Public count            128
    FPC 8   MAC address information:
      Public base address     3c:8a:b0:d2:ab:80
      Public count            128

 

FPC0 is close, but not exact.  What am I missing here.  And, if stp keeps bouncing these ports specifically on fpc4, what should I do?  No other switch uplinks to this stack, so do I really even *need* spanning-tree running on it?  Should consider replacing the switch as defective?

2 REPLIES 2
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Re: Strange STP issue - not sure what I am looking at

‎11-26-2014 03:03 AM

Hi,

 

Can you configure the "edge "  under #edit protocols rstp interfaces hierarchy for interfaces which are going up & down.

 

Still issue is continuos pl  disable the RSTP and check the status of the interfaces.

 

Can you post the config here to look into deep.

 

 

 

........
If this worked for you please flag my post as an "Accepted Solution".

Best Regards,
Suresh Mudhireddy
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Ethernet Switching

Re: Strange STP issue - not sure what I am looking at

[ Edited ]
‎12-18-2014 05:59 PM

STP should be disable on the VC. It has its own built in method to remove loops. Only enable on trunk ports connected to other switches then you could enale RSTP only those interfaces.

The MAC address is the mac address of the switch which has been elected  as the rootbridge

 >show chassis mac-addresses

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