Must-IE check and IE removal for GTPv1 and GTPv2

Junos OS supports the following information element (IE) enforcement functions for GTPv1 and GTPv2: Must-IE check: Use this function to check for the presence of IEs in GTPv1-C and GTPv2-C messages that helps to verify message integrity. The device check for the presence of Must-IEs of specific GTP messages and forwards the messages only if Must-IEs are present. IE removal: Use this function to remove IEs from GTPv1-C and GTPv2-C. This function helps to retain interoperability between Second-Generation Partnership Project (2GPP) and Third-Generation Partnership Project (3GPP) networks.