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CHAPTER
18-1
Cisco 10000 Series Router Software Configuration Guide
OL-2226-23
18
SSO-BFD
To establish alternative paths, networking equipment are designed to rapidly detect communication
failures between adjacent systems. The Bidirectional Forwarding Detection (BFD) protocol detects
failures that occur for short durations in the path between adjacent forwarding engines. BFD is a protocol
that help the underlying networking protocols to detect failures in the forwarding path.
The stateful switchover (SSO)-BFD feature helps achieve high resiliency and availability by allowing
peer switches to start communicating, upon supervisor switchover. This is a high-availability feature that
can be used to mitigate the impact of both planned and unplanned supervisor switchover in a system by
minimizing network disruption.
This SSO-BFD feature is described in the following topics:
• Feature History of SSO-BFD, page 18-1
• Information about SSO-BFD, page 18-1
• Restrictions of SSO-BFD, page 18-3
• Monitoring and Maintaining SSO-BFD, page 18-4
• Configuration Examples of SSO-BFD, page 18-4
Feature History of SSO-BFD
Information about SSO-BFD
Network deployments have dual route processor (RP) routers and switches to provide redundancy. These
routers have a graceful restart mechanism that protects the forwarding state across switchovers. These
dual RP platforms have varying switchover times depending on the hardware that can detect failure and
propagate it. When the BFD protocol runs on the RP, certain platforms, called fast switchover platforms,
are able to detect a switchover before the BFD protocol times out. However, certain platforms, called
slow switchover platforms, are unable to detect a switchover before the BFD protocol times out. The
Cisco 10000 series router is a slow switchover platform. For the BFD protocol to maintain the up state
Cisco IOS Release Description Required PRE
12.2(33)XNE This feature was introduced in the Cisco 10000 series
routers
PRE3 and PRE4