Cisco Cisco Packet Data Gateway (PDG)
Command Line Interface Reference, StarOS Release 17 ▄
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Chapter 233
NTSR Pool Configuration Mode Commands
This mode is used to configure a pool of IP addresses associated with a pool ID and pool type (either MME or S4-
SGSN) for Network Triggered Service Restoration (NTSR).
SGSN) for Network Triggered Service Restoration (NTSR).
MME restoration is a 3GPP specification-based feature designed to gracefully handle the sessions at S-GW once S-GW
detects that the MME has failed or restarted. If the S-GW detects an MME failure based on a different restart counter in
the Recovery IE in any GTP Signaling message or Echo Request / Response, it will terminate sessions and not maintain
any PDN connections.
detects that the MME has failed or restarted. If the S-GW detects an MME failure based on a different restart counter in
the Recovery IE in any GTP Signaling message or Echo Request / Response, it will terminate sessions and not maintain
any PDN connections.
As a part of this feature, if a S-GW detects that a MME or S4-SGSN has restarted, instead of removing all the resources
associated with the peer node, the S-GW shall maintain the PDN connection table data and MM bearer contexts for
some specific S5/S8 bearer contexts eligible for network initiated service restoration, and initiate the deletion of the
resources associated with all the other S5/S8 bearers.
associated with the peer node, the S-GW shall maintain the PDN connection table data and MM bearer contexts for
some specific S5/S8 bearer contexts eligible for network initiated service restoration, and initiate the deletion of the
resources associated with all the other S5/S8 bearers.
The S5/S8 bearers eligible for network initiated service restoration are determined by the S-GW based on operator's
policy, for example, based on the QCI and/or ARP and/or APN.
policy, for example, based on the QCI and/or ARP and/or APN.
The benefit of this feature is that it provides support for the geo-redundant pool feature on the S4-SGSN/MME. In order
to restore session when the MME receives a DDN, the S-GW triggers restoration when the serving MME is unavailable,
by selecting another MME and sending DDN. This helps in faster service restoration/continuity in case of MME/S4-
SGSN failures.
to restore session when the MME receives a DDN, the S-GW triggers restoration when the serving MME is unavailable,
by selecting another MME and sending DDN. This helps in faster service restoration/continuity in case of MME/S4-
SGSN failures.
Mode
Exec > Global Configuration > NTSR Pool Configuration
configure > ntsr pool pool-id id > pool-type type
Entering the above command sequence results in the following prompt:
[local]host_name(config-ntsr-pool)#
Important:
The commands or keywords/variables that are available are dependent on platform type, product
version, and installed license(s).