Some error is appearing on stacked switches eth-trunk interface in S9700

Publication Date:  2014-08-14 Views:  413 Downloads:  0
Issue Description
Some error is appearing on stacked switches Eth-trunk.
******************************************************************************
when i checked my interface using this command [display interface brief]

===========================================================
  ===============display interface brief===============
===========================================================
PHY: Physical
*down: administratively down
^down: standby
(l): loopback
(s): spoofing
(E): E-Trunk down
(b): BFD down
(e): ETHOAM down
(dl): DLDP down
(d): Dampening Suppressed
InUti/OutUti: input utility/output utility
Interface                   PHY   Protocol InUti OutUti   inErrors  outErrors

Eth-Trunk8                  up    up       0.08%  0.11%          0          0
  GigabitEthernet1/4/0/47   up    up       0.14%  0.05%          0          0
  GigabitEthernet2/4/0/47   up    up       0.02%  0.17%          0          0
Eth-Trunk9                  down  down        0%     0%          0          0
Eth-Trunk10                 down  down        0%     0%          0          0
Eth-Trunk11                 up    up       1.44%  1.27%          0          0
  GigabitEthernet1/4/0/44   up    up       2.44%  0.02%          0          0
  GigabitEthernet2/4/0/44   up    up       0.43%  2.52%          0          0
Eth-Trunk12                 up    up       1.81%  1.59%          0          0
  GigabitEthernet1/4/0/45   up    up       0.31%  2.76%          0          0
  GigabitEthernet2/4/0/45   up    up       3.31%  0.43%          0          0
Eth-Trunk13                 up    up       0.11%  0.12%          0          0
  GigabitEthernet1/4/0/34   up    up       0.11%  0.01%          0          0
  GigabitEthernet1/4/0/35   up    up       0.12%  0.01%          0          0
  GigabitEthernet2/4/0/34   up    up       0.11%     0%          0          0
  GigabitEthernet2/4/0/35   up    up       0.11%  0.44%          0          0
Eth-Trunk14                 down  down        0%     0%          0          0
  GigabitEthernet1/4/0/32   up    up          0%     0%          0          0
  GigabitEthernet1/4/0/33   up    up          0%     0%          0          0
  GigabitEthernet2/4/0/32   up    up          0%     0%          0          0
  GigabitEthernet2/4/0/33   up    up          0%     0%          0          0
Eth-Trunk20                 up    up          0%     0%      27559          0
  XGigabitEthernet1/1/0/2   up    up          0%     0%      27555          0
  XGigabitEthernet2/1/0/2   up    up          0%     0%          4          0

Eth-Trunk21                 up    up          0%  0.03%          0          0
  GigabitEthernet1/4/0/23   up    up          0%  0.03%          0          0
  GigabitEthernet2/4/0/23   down  down        0%     0%          0          0
Eth-Trunk22                 up    up          0%  0.03%          0          0
  GigabitEthernet1/4/0/22   up    up          0%  0.03%          0          0
  GigabitEthernet2/4/0/22   down  down        0%     0%          0          0
Eth-Trunk24                 up    up          0%  0.01%     253372          0
  XGigabitEthernet1/1/0/3   up    up          0%  0.01%     127681          0
  XGigabitEthernet2/1/0/3   up    up          0%  0.01%     125691          0

Eth-Trunk25                 up    up          0%  0.02%          0          0
  XGigabitEthernet1/1/0/4   up    up          0%  0.01%          0          0
  XGigabitEthernet2/1/0/4   up    up          0%  0.03%          0          0


Alarm Information
No
Handling Process
A log showing error is not an issue or high priority.
It is Normal 

If you want to remove the error value, we can upgrade a new version (V200R005C00SPC300) which will not treat frames as errors 
Root Cause
After checking the interface status using this command [display interface]



We found that :
All the [Total Error]  equals  [Frams] 

Frames are not really error packets. 
There are two types of packets on switch which are ethnet2 and 802.3. The third field of 802.3 packet means the length of the packet. 
when the packet was encapsulated, The third field was also writed。But the packet is encapsulated more fields when it forwarded, so sometimes the third field maybe writed wrong.

In the software version V200R003 of S9700, when the interface receives a packet whose length doesn’t equal the third field of 802.3 packet,  
The Frames number will increase.  

Suggestions
No

END