Cisco IOS XE Release 3.13S, PMIP MAG SSO feature supports iWAG mobility
sessions that are tunneled to the Mobile Network Operator (MNO) using Proxy
Mobile IPv6 (PMIPv6). The Stateful Switchover (SSO) feature takes advantage of
Route Processor (RP) redundancy by establishing one of the RPs as the active
processor, while the other RP is designated as the standby processor, and then
synchronizing the critical state information between them. When a failover
occurs, the standby device seamlessly takes over, starts performing
traffic-forwarding services, and maintains a dynamic routing table.
Your software release
may not support all the features documented in this module. For the latest
caveats and feature information, see
Bug Search Tool and the
release notes for your platform and software release. To find information about
the features documented in this module, and to see a list of the releases in
which each feature is supported, see the feature information table.
Use Cisco Feature
Navigator to find information about platform support and Cisco software image
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PMIP MAG SSO
The PMIP MAG SSO
feature supports only the Cisco ASR 1000 Series Aggregation Services Routers
intrachassis (RP-to-RP) SSO, but not the interchassis (Cisco ASR1K-to-Cisco
ASR1K) SSO. The First Sign Of Life (FSOL) triggers that are supported on SSO
include DHCP proxy (where the iWAG acts as the DHCP proxy server) and DHCP
proxy plus unclassified MAC.
For more information
about ISSU, see the “Overview of ISSU on the Cisco ASR 1000 Series Routers”
section of the
Cisco ASR 1000 Series Aggregation Services Routers Software
The process as part
of iWAG SSO handling PMIPv6 checkpoints to the standby RP the information that
is necessary to create a copy of the session on the standby RP. Such an
inactive copy of the session becomes active when the standby RP becomes active.
When an iWAG
mobility session with PMIPv6 tunneling is enabled using the SSO/ISSU feature,
the Cluster Control Manager on the active RP needs to wait for a few more
components, including the Policy, SSS, DHCP-SIP etc, to become ready before
checkpoint data collection, and polls these additional components for
checkpoint data during data collection. A very similar operation is performed
on the standby RP as well. Although such additional CPU consumption is per
session, it is not expected to be too heavy since processing in each of these
components should include the time spent on a few data structure lookups and
configuration enables IWAG SSO. No specific command is required for configuring
No new or modified MIBs are supported by this feature.
locate and download MIBs for selected platforms, Cisco software releases, and
feature sets, use Cisco MIB Locator found at the following URL:
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Information for PMIP MAG SSO
The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.
Table 1 Feature
Information for PMIP MAG SSO
XE Release 3.13S
IOS XE Release 3.13S, this feature was implemented on the Cisco ASR 1000 Series
Aggregation Services Routers.