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Topology-based Gateway Selection
Configuring Topology-based GW Selection ▀
SGSN Administration Guide, StarOS Release 18 ▄
Configuring Topology-based GW Selection
Topology-based GW selection is configured via the SGSN’s CLI.
Configuration for this feature includes one or more of the following tasks, depending on the type of SGSN:
enabling topology-based selection,
enabling co-location-based selection,
enabling weight (considering degree and order of GW listing in the DNS record) as a selection factor,
configuring GW-type preference for selection,
configuring canonical name (Gn/Gp-SGSN only),
enabling S-NAPTR queries for GGSN selection (Gn/Gp-SGSN only).
For details on all of the command listed below, refer to the release-specific Command Line Interface Reference.
Configuring GW Selection
Configuring this feature is done at the call control profile level for both S4-SGSN and Gn/Gp-SGSN.
The
gw-selection
command in the call control profile configuration mode configures the parameters controlling the
gateway selection process for both the Gn/Gp-SGSN and the S4-SGSN.
Important:
When configuring for a Gn/Gp-SGSN, use the P-GW options to identify either a GGSN or a co-
located P-GW.
configure
call-control-profile profile_name
gw-selection { { co-location | pgw weight | sgw weight | topology } [ weight [
prefer { pgw | sgw } ] ] }
prefer { pgw | sgw } ] ] }
end
Notes:
co-location enables the SGSN to select topologically closer P-GW and S-GW nodes, irrespective of the ‘topon’
or ‘topoff’ prefix being present in the hostname received in the results of the DNS query.
pgw weight enables the SGSN to apply load balancing during selection of P-GW nodes.
sgw weight enables the SGSN to apply load balancing during selection of S-GW nodes.
topology enables the SGSN to select topologically closer P-GW and S-GW nodes, only when ‘topon’ prefix is
present in the hostname received as part of the DNS query results.
weight enables load balancing during selection of a node. When topology is applicable, weight instructs the
SGSN to apply weight-based selection only on node pairs with the same degree and order.
prefer instructs the SGSN to consider weight values for preferred GW type (P-GW or S-GW) during the first
primary activation.