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15-3
Cisco Unified Border Element (SP Edition) Configuration Guide: Unified Model
OL-19820-15
Chapter 15 Interchassis High Availability
Information About Interchassis High Availability
In Cisco ASR 1006 Series Routers and Cisco ASR 1013 Series Routers, interchassis redundancy is
not supported with intrachassis redundancy. It is supported with a single RP and ESP in the chassis.
When CUBE-SP is in inter-chassis redundancy mode, customer need to use sync command in the
active box to sync the configuration file from active box to standby box so that the latest
configuration of CUBE-SP will be synchronized in the running configuration file in the standby box.
Information About Interchassis High Availability
The Interchassis High Availability feature enables the configuration of pairs of routers to act as backup
for each other. This feature can be configured to determine the active router based on a number of
failover conditions. When a failover occurs, the standby router seamlessly takes over and starts
processing call signaling and performing media forwarding.
Groups of redundant interfaces are known as redundancy groups. Figure 15-1 depicts the active-standby
device scenario. It shows how the redundancy group is configured for a pair of routers that have a single
outgoing interface.
The routers are joined by a configurable control link and data synchronization link. The control link is
used to communicate the status of the routers. The data synchronization link is used to transfer stateful
information from the SBC, and to synchronize the stateful database for the calls and media flows. Each
pair of redundant interfaces are configured with the same unique ID number, also known as the RII.
Figure 15-1 Redundancy Group Configuration
Router 1
Group A
Router 2
Control Link
Data Link
Virtual IP 1
Virtual MAC 1
Virtual IP 2
Virtual MAC 2
Virtual IP 1
Virtual MAC 1
Virtual IP 2
Virtual MAC 2
Group A
Interface Interlink
254200
Active
Standby

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