GTP: What are the use of GTP-C messages ?

Question

Sequence numbers are required in a handful of message types (handover, etc.), but I need to know if they are usually present even when they are optional in the message definitions. Can you point me to a publically available pcap trace of live traffic?

Answer 1

The GTP-C messages are used for the control plane path management, for the control plane tunnel management and for mobility management.

Comments

I have a very small doubt. Does the "Create session request/response" messages represent path management ? And bearer related messages represent tunnel management ?

Answer 2

GTP-C (v2) in LTE is used for tunnel management, some of the signalling messages are listed below which use GTP-Cv2 protocol

Interfaces
SGW <--> MME (S11 Interface)
SGW <--> PGE (S5 Interface)

Specification
GTPv2-C – 3GPP TS 29.274