Echo Request

These messages are sent from the controller to GGSN server or from GGSN server to the controller.

The table below lists the message attributes.

Table 1. Echo request attributes
Attribute Presence Type Description
Flags:
  • Version
  • Protocol type
  • Spare bit
  • Extension header
  • Sequence number
  • N-PDU flag
M
  • Version - 1
  • PT - GTP (1)
  • Spare bit- 0
  • E - 0
  • S - 1
  • PN - 0
  • Version - Determines the version of GTP protocol
  • Protocol type - Protocol discriminator between GTP (when PT is “1”) and GTP' (when PT is “0”)
  • Extension header - Indicates the presence of a meaningful value of the next extension header
  • Sequence number - Value of the sequence number is set to zero (0).
  • N-PDU Number - Value of the N-PDU number is set to zero (0).
Message Type M Integer Message type value is 1.
TEID M Integer This attribute value is set to zero (0).