Cisco Cisco Packet Data Gateway (PDG)
P-GW Changes in Release 16
▀ P-GW Enhancements for 16.0
▄ Release Change Reference, StarOS Release 16
362
CSCuh28410 - GTP-U UDP Bundle
Feature Changes
GTP-U UDP Bundle
Currently, for forwarding GTP-U data packets, standard UDP port (2152) as source and destination port are used for
outgoing GTP-U packet. This creates hardship to balance traffic properly over the LAG interfaces between the different
L2/L3 elements in the network. Some routers use source UDP port to do load balancing of packets towards destination.
outgoing GTP-U packet. This creates hardship to balance traffic properly over the LAG interfaces between the different
L2/L3 elements in the network. Some routers use source UDP port to do load balancing of packets towards destination.
As part of this feature, behavior is changed so that source port outgoing GTP-U packet is different for each SESSMGR.
The destination port should remain as 2152, as per protocol.
The destination port should remain as 2152, as per protocol.
The usage of non-standard source port number is permitted, as per section 4.4.2 of 3GPP TS 29.281. This feature does
not require deviation from any GTP-U protocol aspects as defined in 3GPP TS 29.281.
not require deviation from any GTP-U protocol aspects as defined in 3GPP TS 29.281.
A new CLI is added in GTP-U Service configuration to enable this behavior. By default, standard port 2152 is used as
source port.
source port.
Customer Impact: Helps in doing effective load balancing of data traffic over LAG interfaces on some routers.
Command Changes
source-port
This new command configures GTP-U data packet source port related parameters.
configure
context context_name
gtpu-service service_name
source-port { non-standard | standard }
default source-port
end
Notes:
non-standard
: Configures GTP-U service to use multiple non-standard ports defined by system as a source
port for GTP-U data packets. Starting port is 25500. Non-standard port number is unique per session manager
instance.
instance.
standard
: Configures GTP-U service to use standard port 2152 as source port for all GTP-U data packets.
default
: Configures GTP-U service to use standard port 2152 as source port for all GTP-U data packets.
By default, standard port 2152 will be configured as GTP-U data packet source port (same as existing behavior).
Performance Indicator Changes
show gtpu-service name