This article provides an explanation on how to check the cause of the dropped GTP packets.
The below command enlists the detailed GTP counters.
root@lab> show security gprs gtp counters all
node0:
--------------------------------------------------------------------------
Tunnel counters:
Total GTPv0 GTPv1-c GTPv1-u GTPv2-c GTPv2-u
Allocated 2270 0 0 0 1135 1135
Freed 2270 0 0 0 1135 1135
Packet counters:
Total GTPv0 GTPv1 GTPv2 GTP'
Received 55672 0 9862 45810 0
Passed 54800 0 9862 44938 0
Dropped 872 0 0 872 0>>>>>>>>>>>>>>>>>>>>>>>>>>>>Total 872 packets were dropped.
Data-packet counters:
gtpv1 data pkt received : 0
gtpv1 data pkt passed : 0
gtpv1 data pkt dropped : 0
gtpv1 data pkt no-tunnel dropped : 0
gtpv1 data pkt sequence error dropped : 0
gtpv1 data pkt end-user dropped : 0
gtpv1 data pkt other dropped : 0
gtpv0 data pkt received : 0
gtpv0 data pkt passed : 0
gtpv0 data pkt dropped : 0
gtpv0 data pkt no-tunnel dropped : 0
gtpv0 data pkt sequence error dropped : 0
gtpv0 data pkt end-user dropped : 0
gtpv0 data pkt other dropped : 0
Brief message counters:
Receive Forward Drop
GTPv0
Create PDP Request 0 0 0
Create PDP Response 0 0 0
Update PDP Request 0 0 0
Update PDP Response 0 0 0
Delete PDP Request 0 0 0
Delete PDP Response 0 0 0
Create AA PDP Request 0 0 0
Create AA PDP Response 0 0 0
Delete AA PDP Request 0 0 0
Delete AA PDP Response 0 0 0
SGSN Context Request 0 0 0
SGSN Context Response 0 0 0
SGSN Context Acknowledge 0 0 0
Others 0 0 0
GTPv1
Forward Relocation Request 0 0 0
Forward Relocation Response 0 0 0
Others 9862 9862 0
GTPv2
Create Session Request 1135 1135 0
Create Session Response 1672 1135 537>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>Total 537 "create session response" packets were dropped.
Delete Session Request 1135 1135 0
Delete Session Response 1135 1135 0
Create Bearer Request 0 0 0
Create Bearer Response 0 0 0
Modify Bearer Request 1135 1135 0
Modify Bearer Response 1143 1135 8>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>Total 8 " Modify Bearer Response" packets were dropped.
Delete Bearer Request 327 0 327>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>Total 327 "Delete Bearer Request" packets were dropped.
Delete Bearer Response 0 0 0
Context Request 0 0 0
Context Response 0 0 0
Context Acknowledge 0 0 0
Create Indirect Tunnel Request 0 0 0
Create Indirect Tunnel Response 0 0 0
Others 38128 38128 0
Error counters:
Total error : 1199>>>>>>>>>>>>>>>>>Gives total error counter
Exception : 0
Invalid header : 0
Message length : 0
Zero IMSI : 0
Zero charge ID : 0
Sequence : 0
APN filter : 0
Port not match : 0
GTP-in-GTP : 0
Message too short : 0
Message too long : 0
GSN not exist : 0
Over GSN rate limit : 0
Request not found : 0
Retransmit response : 0
Missing IE : 0
Unexpected IE : 0
Unknown IE type : 0
IE order : 0
IE length : 0
Duplicate IE : 0
Non-digit TID/TEID : 0
Non-zero TID/TEID : 0
Zero TID/TEID : 0
Control TID/TEID : 0
Data TID/TEID : 0
Control GSN IE : 0
Data GSN IE : 0
End user IE : 0
GGSN IP for handover : 0
Disallowed v0 message : 0
Disallowed v1 message : 0
Disallowed v2 message : 0
Invalid message type : 0
No tunnel0 : 0
No control tunnel : 327>>>>>>>>>>>>>>>>>>>>>>>>>>Cause of GTP packet drops.
No user tunnel : 0
Invalid tunnel0 : 0
Invalid control tunnel : 0
Invalid user tunnel : 0
Create tunnel0 : 0
Create control tunnel : 0
Create user tunnel : 0
No request : 545>>>>>>>>>>>>>>>>>>>>>>>>>>Cause of GTP packet drops.
Out of request : 0
No action : 0
Out of action : 0
GTPv2 TEID not exist : 0
GTPv2 Missing TEID : 0
GTPv2 Non-zero EBI : 0
GTPv2 EBI not found : 0
GTPv2 IE context : 0
Duplicate new jbuf : 0
Out of jmpi cookie : 0
Send jmpi message : 0
JMPI target : 0
Out of callback cookie : 0
Reinject packet : 0
Distribute wrong spu : 0
System under reset : 0
Source IP : 0
Destination IP : 0
Invalid EBI : 0
SPU not all up : 0
Interface not support : 0
Out of path : 0
Over path rate limit : 0
New utnl key : 0
No utnl key : 0
End user : 0
New sync action : 0
NSAPI : 0
New conflict sync action : 0
Primary u-tunnel id not exist : 0
Too many same type ie : 0
Invalid v2 lbi : 0
Remove conflict utnl : 0
Conflict primary u-tunnel : 0
Ctnl recovery error : 0
Link ctnl conflict : 0
Link utnl conflict : 0
Link tnl0 conflict : 0
Error ggsn ip for v0 packet : 0
Invalid payload(NAT) : 0
Wrong SPU since NULL sinfor : 0
Wrong SPU since no match wings: 0
Wrong SPU since no anchor GSN : 327>>>>>>>>>>>>>>>>>>>>>>>>>>Cause of GTP packet drops.
Bad reqeust retransmit : 0
Cross group handover deny : 0
Handover default deny : 0
Tunnel in processing : 0
NE group check failure : 0
UE group check failure : 0
Over APN-controlled rate limit: 0
HA counters:
Total message received : 0
Message received success : 0
Bad message received : 0
Unknown message type received : 0
Unknown message version received : 0
Total message send : 3405
Message send success : 3405
Message send failed : 0
Memory allocate failed : 0
Message received during tunnel reset: 0
Request counters:
Request allocated : 28274
Request freed : 28274
Request allocated fail : 0
Request hit by wrong SPU : 0
Request pending for JMPI ACK : 0
Path-rate-limit counters:
Drop Alarm
Create Request 0 0
Delete Request 0 0
Echo Request 0 0
Others 0 0
Rate-limit counters:
Packets 0 0
ULI IE Masked GTP Counters:
Packets
Total 0
LAC 0
SAC 0
RAC 0
TAC 0
CI 0
ECI