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Information About Subscribers
Synchronizing Subscriber Information in a Cascade System
In a hot standby, cascade setup with full redundancy, the external provisioning server updates only the
active SCE platform. However, the standby SCE platform must always be updated with the latest
subscriber-related information (login, logout). This is required to minimize information loss in case of
fail-over. In general, the only entity that is allowed to change subscriber information in the standby SCE
platform is the active SCE platform. The standby SCE platform does not accept any subscriber
operations (it returns a STANDBY_VIOLATION error instead), and it also does not generate any
asynchronous subscriber notifications (such as pull-response or logout-notification).
There are only two exceptions to this rule:
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Therefore, when working as a pair, the active SCE platform constantly updates the standby SCE platform
with external data information. In addition, the standby SCE platform constantly requests external data
information from the active SCE platform. The synchronization is bi-directional to ensure that the
subscriber databases in both SCE platforms are identical.
Note that external data is only relevant for introduced subscribers (both static and dynamic). It has no
meaning for anonymous subscribers or the default subscriber. No more than two minutes of external data
information will be lost by the standby SCE platform if a fail-over occurs.
The following subscriber information is considered as external data:
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Only the active SCE platform communicates with the SM. The SM is aware of the active/standby state
of each SCE platform, and is also aware of a fail-over.
Specifically, this means the following:
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Cisco SCE 2000 and SCE 1000 Software Configuration Guide
9-6
Standby SCE platform can change subscriber information of the default subscriber.
Standby SCE platform can perform subscriber aging.
subscriber name
mappings (all supported types – IPs, VLANs, MPLS/VPN)
tunables
manager name
aging time
lease time
is-static flag
In push mode, the SM pushes events to the active SCE platform, which updates the standby SCE
platform.
In pull mode, only the active SCE platform pulls subscribers from the SM.
The standby SCE platform can create anonymous subscribers based on the updates received from
the active SCE platform, but does not generate pull-response for them.
If SCE-SM connection failure, the SM handles the SCE recovery of the active SCE platform only.
The active SCE platform propagates the information to the standby SCE platform.
Chapter 9
Managing Subscribers
OL-7827-12
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