Feature Description
The National Security/Emergency Preparedness (NS/EP) Next Generation Network (NGN) Priority Services (NGN-PS) (formerly called NGN Government Emergency Telecommunications Service (GETS)) is a set of voice, video and data services that are based on services available from public packet-switched Service Providers. The NS/EP NGN-PS provides priority treatment for a Service User’s NS/EP communications and is particularly needed when the Service Providers’ networks are impaired due to congestion and/or damage from natural disasters (such as floods, earthquakes and hurricanes) and man-made disasters (such as physical, cyber or other forms of terrorist attacks).
The DSCP marking of control message from P-GW and S-GW was based on associated egtpc-service configuration.
For control message belonging to eMPS session or containing Allocation and Retention Priority (ARP) associated with eMPS profile, the DSCP marking is based on eMPS profile configured DSCP value.
As part of this enhancement, support is also added for marking of certain GTP-C message at the P-GW and S-GW for priority treatment as defined in the Government Industry Requirements (GIR) NS/EP NGN.
Relationships to Other Features
Bulkstats for GTP-C Messages by ARP Value: The S-GW/P-GW will generate peg counts of the total number of received GTP-C messages containing an ARP, chosen from the set of values allocated for NS/EP NGN-PS use, for a specified interval (in minutes). This peg count is administered at the S-GW/P-GW level.
To prevent throttling of GTP-C messages corresponding to eMPS PDNs or messages containing ARP from set of configured ARP(PL) reserved for NS/EP NGN priority service, following configuration are to be considered:
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Load Overload control
In overload control profile, the set of ARPs reserved for NS/EP NGN-PS use for eMPS services should also be defined under throttling-behavior exclude and self-protection-behavior exclude CLI commands. This will ensure that incoming GTP-C messages for eMPS PDN or containing ARP from set of reserved ARP for eMPS use are not throttled. Example of configuring Load Overload configuration:
configure gtpc-overload-control-profile profile_name throttling-behavior { earp { 1...15 } * } { exclude } self-protection-behavior { earp { 1...15 } * } { exclude } end -
For Prioritized handling of calls under Congestion condition
ARP reserved under NS/EP NGN-PS for eMPS services is recommended to be configured under following congestion control CLI command. This will ensure that new call requests are not throttled during congestion condition defined by the congestion-control CLI command at context level:
configure context context_name egtp-service service_name gtpc allow-on-congestion arp arp_value end -
GTP-C RLF Throttling
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If GTP-C RLF Throttling feature is enabled, then gtpc overload-protection egress throttling-override-policy CLI command should be configured with ARP(PL), reserved for NS/EP NGN-PS use, for eMPS services to bypass RLF throttling.
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If GTP-C RLF Throttling for incoming messages is configured using gtpc overload-protection ingress msg-rate message_rate CLI command, then eMPS related messages can get throttled. Currently, there is no bypass policy for incoming RLF throttling.
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 Important |
Any existing features which works on ARP (PL) configurations will continue to work as before irrespective of whether ARP values configured are same as reserved under NS/EP NGN-PS for eMPS services. If existing features need to work with eMPS requirements, then same ARP (PL) values should be configured as reserved NS/EP NGN-PS for eMPS services. |
Licensing
The DSCP marking capability requires that a valid license key be installed. Contact your Cisco Account or Support representative for information on how to obtain a license.
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