How to use statistic function for troubleshooting

 Topology : BAS--（eth-trunk0）---S9306（g1/0/1）====DSLAM---clients

The manage IP addresses  of S9306 and dslam are both static users fo  BAS device.  And  we cant ping from  S9306 and DSLAM  to  BAS. But S9306 and DSLAM ping each other is normal.

null

1, As we found that  hang DSLAM pc dialing is successful, pc to BAS link is smooth; simultaneously view up and down the line 9306 port, errors are 0;
2,And we confirmed the configuration is ok too.
4, S9306 supports access direction traffic statistics, and ETH-Trunk interface is also support for the issue provides a powerful tool to locate specific statistical methods are as follows:

First, the definition of good BAS to dslam and bas dslam to the icmp data stream:
[S9306-acl-adv-3031]rule per icmp s 10.191.124.218 0  des 10.191.124.220 0
[S9306-acl-adv-3030]rule per icmp source 10.191.124.220 0 des 10.191.124.218 0

Then do the traffic statistics action, binding C / B pair, traffic statistics defined strategy:
[S9306-behavior-tj]statistic enable
[S9306-1-trafficpolicy-BastoDSLAM]c BastoDSLAM b tj
[S9306-1-trafficpolicy-DSLAMtoBas]c DSLAMtoBas b tj

Then apply the policy direction in and out of the corresponding interface must be correct, then the S9300 BAS interface in the inbound direction, then the direction of the hair BastoDSLAM strategy under DSLAM; S9300 pick BAS interface in the outbound direction, then the inbound direction issued under DSLAM DSLAMtoBas strategy:
[S9306-1-Eth-Trunk0]traffic-policy BastoDSLAM in
[S9306-1-Eth-Trunk0]traffic-policy DSLAMtoBas out

Then on the bas active ping dslam 5 packets, viewed on 9306 traffic statistics and found two interfaces four directions values ​​are 5, 9306 forwarding instructions properly:
 <RH-S9306-1> dis traffic po st int Eth-Trunk 0  out                            
                                                                               
Interface: Eth-Trunk0                                                         
Traffic policy outbound: 5to2                                                 
Rule number: 1                                                                
Current status: OK!                                                           
Board : 4                                                                     
Item                              Packets                       Bytes          
---------------------------------------------------------------------          
Matched                                 0                           0          
  +--Passed                             0                           0          
  +--Dropped                            0                           0          
    +--Filter                           0                           0          
    +--URPF                             -                           -          
    +--CAR                              0                           0          
Board : 5                                                                     
Item                              Packets                       Bytes          
---------------------------------------------------------------------          
Matched                             5                     540         
  +--Passed                        5                     540          
  +--Dropped                            0                           0          
    +--Filter                           0                           0          
    +--URPF                             -                           -          
    +--CAR                              0                           0
After that BAS side check to make sure BAS exception.

Analysis:
1, link failure;
2, configuration issues;
3,9306 forwarding problem;
4, other equipment issues;

Available for inbound / outbond direction while under S9300 port traffic statistics, very easy for us to locate the problem.