Cisco Systems SBC-111 Network Router User Manual


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SBC-111
Cisco IOS XR Session Border Controller Configuration Guide
Implementing SBC Redundancy (High
Availability)
SBC fault tolerant redundancy is based on a 1:1 paired protection model. For each active service card running
with the SBC, there should be another service card providing failure protection (that is, standby). The same
services must be provisioned on both cards (one as the primary card, one as the standby card); in this instance,
the service cards are described as “paired”.
From a Cisco IOX XR system perspective, service cards are always running in active mode. SBC services
running on these cards, however, run as either a primary service or standby service.
Given that SBC functionality is split among two logical service entities—the signaling border element (SBE)
service and data border element (DBE) service—these services run on Cisco IOX XR service cards as
follows:
• In the Unified model, SBE and DBE run on the same service card. In this case, SBE and DBE
services are implemented as a single Cisco IOS XR process.
• In the Distributed model, SBE and DBE services run as separate Cisco IOX XR processes (and there
may be one or more distributed DBE(s) per SBE). When running in this mode:
–
SBE and DBE services may be provisioned on different cards within the same physical device
to distribute the processing load across available service cards.
–
SBE and DBE may be located on different physical devices.
Where there is no standby service card available, a software failure results in a restart of the primary SBC
process. If this succeeds, the SBC process loses all call states, but management and configuration information
stored in SysDb is recovered and re-applied on restart.
When there is a standby SBC provisioned, the active SBC replicates the state to the standby to provide hot
standby support. The SBC process is fate shared with the Media Packet forwarder component; if one
component restarts, the other component will restart.
Note For a complete description of commands used in this chapter, refer to the Cisco IOS XR Session Border
Controller Command Reference. To locate documentation for other commands that appear in this
chapter, use the command reference master index, or search online.
Feature History for Implementing SBC Redundancy
Release Modification
Release 3.3.0 This feature was introduced on the Cisco XR 12000 Series Router.
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