Related Documentation
Understanding GTPv1 Information Element Removal
The number of network elements in a mobile network is expanding with the introduction of multiple releases of 3GPP specifications. Every release introduces newer information elements (IEs) that are not defined in the prior releases. Therefore mobile networks have diverse set of network elements creating inter operability problems between different releases of the devices. You can configure the GPRS tunneling protocol (GTP) firewall to remove information elements (IE) by release with the following command.
set security gprs gtp profile gtp1 remove-ie.
However newer IEs that will be introduced in the future releases might also cause inter operability problems. Each information element has a unique ID, the IE number. IE numbers range from 1 to 255. You can configure the GTP firewall to remove specific IEs using the user-configured IE number.
When you configure the IE removal, the GTP firewall deletes the corresponding IEs of the GTPv1 messages; updates the length of the GTP, the UDP, and the IP; and then passes the GTPv1 message. The GTP firewall also updates the cyclic redundancy check (CRC) code. IE removal by IE number supports all IEs, ranging from 1 to 255.
You can remove the IE removal configuration with the following commands:
delete security gprs gtp profile gtp1 remove-ie—Deletes the IE removal configuration for the GTP profile GTP1.
delete security gprs gtp profile gtp1 remove-ie version v1 number 4—Deletes the IE removal configuration for GTP profile with version v1 and IE number 4.
 | Note: The IE removal feature supports GTPv1 only. |
