GTP Deployment
GPRS Tunneling Protocol (GTP) is a suite of IP-based communication protocols defined by 3GPP, facilitating General Packet Radio Service (GPRS) across GSM, UMTS, LTE, and 5G networks.
The GTP deployment includes the following capabilities:
GTP Parsing: Supports both standard GTP packets and GTP packets with a extension header.
Rule Matching: Enables filtering based on inner headers, including IP addresses, Layer 4 ports, and TEID.
Symmetric Load Balancing: Supports load balancing on both inner and outer IP headers (IPv4/IPv6).
The following image shows a visual representation of the GTP deployment:

GTP Extension Header Support
Overview
Traditionally, GTP packets contain a standard header that encapsulates user payload or signaling data. However, advanced use cases require GTP extension headers to include additional metadata beyond the standard GTP header.
With this enhancement, the system now supports GTP packets with extension headers (specifically type 0x85) alongside standard GTP packets, ensuring compatibility with evolving network requirements.
Key Details
Supported Extension Header Type: The system currently supports GTP extension header Type 0x85, which is used to add custom metadata for enhanced network functions.
Supported Hardware: Available only on NVIDIA Spectrum-2 and later platforms.
TEID-based filtering is not yet supported for GTP packets with extension headers
Configuration
1. Configure Network/Tool port(s)
//Network ports
configure terminal
interface ethernet Ethernet12/1
forward-error-correction rs
type network
exit
//Tool ports
configure terminal
interface ethernet Ethernet16/1
forward-error-correction rs
type tool
exit
2. Enable GTP filtering
configure terminal
gtp
exit
3. Configure flow with rules to filter GTP traffic
configure terminal
flow flow01
network-ports Ethernet12/1
tool-ports Ethernet16/1
rule 1 permit src-ip 1.1.1.1/32 dest-ip 2.2.2.2/32 gtp "inner-sip 10.0.0.1/24 inner-dip 20.0.0.1/24" counters enable
!
4. Verify the interfaces
pbnoscli# show interface status
================================================================================================
Port Name Oper Admin Vlan Speed MTU AutoNeg
================================================================================================
Ethernet1/1 etp1 up up 100000 9100 on
Ethernet2/1 etp2 up up 100000 9100 on
<..>
Ethernet63/1 etp63 up up 100000 9100 on
Ethernet64/1 etp64 up up 100000 9100 on
pbnoscli#
5. Verify the flow
pbnoscli# show flow summary
Flow-Name Rule-Id Status Counter-Value
=========================================================
flow01 1 Active 103511710
pbnoscli#
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