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Cisco uBR10012 Universal Broadband Router Software Configuration Guide
OL-1520-08
Chapter1 Overview of CiscouBR10012 Universal Broadband Router Software
Supported Software Features for the CiscouBR10012 Router
Virtual Interfaces
The Cisco uBR10012 router supports the following virtual interface features, primarily in the Cisco IOS
12.3 BC release train:
•Virtual Interface and Frequency Stacking Support on the CiscouBR10-MC5X20S/UBPE
•Virtual Interface Support for HCCP N+1 Redundancy
•Virtual Interface Bundling on the CiscouBR10-MC5X20S/UBPE

Virtual Interface and Frequency Stacking Support on the CiscouBR10-MC5X20S/UBPE

Virtual interfaces (VI) and frequency stacking (FS) are two features that allow user-configurable MAC
domains and multiple frequencies on one physical connector.
•Virtual interfaces allow up to eight upstreams (USs) per downstream (DS). A virtual interface links
an upstream (US) port to a physical connector.
Cisco IOS Release 12.3(9a)BC introduces Virtual Interface Support for HCCP N+1 Redundancy
with the Cisco uBR10-MC5X20S/U BPE.
•Frequency stacking allows two frequencies to be configured on one physical connector.
Cisco IOS Release 12.3(9a)BC introduces support for frequency stacking on the Cisco uBR10012 router.
The Cisco uBR10-MC5X20S/UBPE can be configured (initially) to match the DS and US configuration
of an existing line card, and then the cable operator can modify the configurations according to their
needs. This supports different DS-to-US port ratios as such combination ratios evolve (1x6 » 1x4 » 1x1).
For example, the line card can be used in 1x1 configuration for a business customer and in 1x7
configuration for residential customers.
For additional information about configuring virtual interfaces and frequency stacking, refer to the
following document on Cisco.com:
•Virtual Interfaces and Frequency Stacking Configuration on MC5x20S and MC28U Linecards
http://www.cisco.com/en/US/tech/tk86/tk804/technologies_white_paper09186a0080232b49.shtml
•Configuring Virtual Interfaces on the Cisco uBR10-MC5X20S/U Card
http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122newft/122limit/122bc/122b
c_15/mc5x2vif.htm

Virtual Interface Support for HCCP N+1 Redundancy

Cisco IOS Release 12.3(9a)BC introduces support for HCCP N+1 Redundancy for virtual interfaces
configured on the Cisco uBR10012 universal broadband router using the
CiscouBR10-MC5X20S/UBPE.
HCCP N+1 Redundancy is an important step toward high availability on CMTS and telecommunications
networks that use broadband media. HCCP N+1 Redundancy can help limit Customer Premises
Equipment (CPE) downtime by enabling robust automatic switchover and recovery in the event that there
is a localized disruption in service.
Beginning with Cisco IOS Release 12.2(15)BC2a, HCCP N+1 Redundancy adds synchronization
between HCCP Working interface configurations and those inherited upon switchover to HCCP Protect
interfaces. This makes the configuration of both easier and switchover times faster.
For additional information about configuring virtual interfaces in HCCP N+1 redundancy on the Cisco
CMTS, refer to the following document on Cisco.com:
•N+1 Redundancy for the Cisco Cable Modem Termination System