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Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide
OL-2239-05
Chapter1 Overview of Cisco uBR7200 Series Software
Supported Software Features for the Cisco uBR7200 Series
Cisco DDC (Dual DOCSIS Channel)
The Cisco Dual DOCSIS Channel (DDC) feature provides redundancy to cable voice and data customers
by using two or three CMTSs with connected RF upstreams and downstreams. Redundancy is provided
by controlling each CMTS on which the cable modems register, and by allowing movement of the cable
modems between the Cisco CMTS systems.
Cisco DDC provides redundancy during planned downtime, especially during software upgrades, with
minimal configuration or control external to the Cisco CMTS.
For information about configuring, maintaining and troubleshooting DDC on the Cisco uBR7246VXR
router, refer to the section “Configuring Dual DOCSIS Channel on the Cisco uBR7246VXR Universal
Broadband Router” in the following document on Cisco.com:
• Cisco Dual DOCSIS Channel (DDC) on the Cisco uBR7246VXR Universal Broadband Router
http://www.cisco.com/en/US/products/hw/cable/ps2217/products_feature_guide09186a008026d9d5.html
DRP Server Agent
The Director Response Protocol (DRP) is a simple User Datagram Protocol (UDP)-based application
developed by Cisco Systems. It enables Cisco's DistributedDirector product to query routers (DRP
Server Agents) in the field for Border Gateway Protocol (BGP) and Interior Gateway Protocol (IGP)
routing table metrics between distributed servers and clients. DistributedDirector, a separate standalone
product, uses DRP to transparently redirect end-user service requests to the topologically closest
responsive server. DRP enables DistributedDirector to provide dynamic, scalable, and “network
intelligent” Internet traffic load distribution between multiple geographically dispersed servers.
DRP Server Agents are border routers (or peers to border routers) that support the geographically
distributed servers for which DistributedDirector service distribution is desired. Note that, because
DistributedDirector makes decisions based on BGP and IGP information, all DRP Server Agents must
have access to full BGP and IGP routing tables. For configuration information, refer to the section titled
“Configuring a DRP Server Agent” in the CiscoIOS IP Configuration Guide, Release 12.2.
DSX Messages and Synchronized PHS Information
Cisco IOS Release 12.3(17a)BC introduces support for PHS rules in a High Availability environment.
In this release, and later releases, PHS rules synchronize and are supported during a switchover event of
these types:
• Route Processor Redundancy Plus (RPR+), with Active and Standby Performance Routing Engines
(PREs)
• HCCP N+1 Redundancy, with Working and Protect cable interface line cards
For additional information about these enhancements, and related High Availability features, refer to the
following documents on Cisco.com:
• N+1 Redundancy for the Cisco Cable Modem Termination System
http://www.cisco.com/en/US/products/hw/cable/ps2217/products_feature_guide_chapter09186a00
8015096c.html
• Route Processor Redundancy Plus for the Cisco uBR10012 Router
http://www.cisco.com/en/US/products/hw/cable/ps2209/products_feature_guide09186a00801a24e
0.html