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Cisco Cable Wideband Solution Design and Implementation Guide, Release 1.0
OL-10705-02
Chapter 2 Cisco Cable Wideband Components
Wideband CMTS Redundancy and Resiliency
PRE2 Redundancy and Resiliency
The Route Processor Redundancy Plus (RPR+) feature and DOCSIS Stateful Switchover (DSSO) in the
Cisco IOS software provide the Cisco uBR10012 router’s PRE2 route processors with fast route
processor failover without DOCSIS line card reboot.
Route Processor Redundancy Plus
The RPR+ feature enables the Cisco uBR10012 router to use two PRE2 route processors in a redundant
configuration: an active and standby PRE2 module. If the active PRE2 module fails, or is removed from
the system, the standby PRE2 detects the failure and initiates a switchover. During a switchover, the
standby PRE2 assumes control of the router, connects with the network interfaces, and activates the local
network management interface and system console.
Using the RPR+ feature, the standby PRE2 module is fully initialized and configured. This allows RPR+
to dramatically shorten the switchover time if the active PRE2 fails, or if a manual switchover is
performed. Because both the startup configuration and running configuration are continually
synchronized from the active to the standby PRE2 route processor, line cards are not reset during a
switchover. The interfaces remain up during this transfer, so neighboring routers do not detect a link flap
(that is, the link does not go down and back up).
The RPR+ feature does not require a full reboot of the system to perform a failover. When the system is
originally initialized, the secondary PRE2 module performs an abbreviated initialization routine—the
module performs all self-checks and loads the Cisco IOS software, but instead of performing normal
systems operations it begins monitoring the primary PRE2 module. If the secondary PRE2 module
detects a failure in the primary module, it can quickly assume the primary responsibility for systems
operations.
During RPR+ switchover, wideband cable modems on the CMTS will stay online. The MAC state for
the wideband cable modem will remain online for a modem registered as a DOCSIS 2.0 modem, or
w-online for a modem registered as a wideband cable modem.
DOCSIS Stateful Switchover
DOCSIS Stateful Switchover increases service uptime by instantaneously switching over between dual
route processors should one processor fail. Switchover takes place without resetting or reloading line
cards or affecting related subsystems or processes. The advantage of DOCSIS Stateful Switchover (with
RPR+) is that a switchover between the primary and standby RP will not require the cable interfaces to
be reset, nor do the modems reregister or go offline. Furthermore, the cable modems retain their
service IDs (SIDs) through the switchover.
For more information on PRE2 and RPR+ and DOCSIS Stateful Switchover, see the document Route
Processor Redundancy Plus on the Cisco uBR10012 Universal Broadband Router.
uBR10-MC5X20 Line Card Redundancy
The Cisco uBR10012 router supports N+1 Redundancy on the cable interface line cards including the
uBR10-MC5X20S/U/H and uBR10-MC5X20U-D line cards, which are used in the Cisco Cable
Wideband Solution.
- Release 1.0 1
- CONTENTS 3
- Contents 4
- Preface 7
- Document Organization 8
- Related Documentation 8
- Related Documentation 9
- Conventions 10
- Security Guidelines 11
- OL-10705-02 12
- Solution Overview 13
- Architecture and Scope 14
- Solution Key Features 15
- Solution Components 15
- Third-Party Equipment 16
- Base CMTS Components 17
- Base CMTS Components 18
- Faceplate 21
- Cisco uBR10-MC5X20S 22
- Cisco uBR10-MC5X20U and H 22
- Cisco uBR10-MC5X20U-D 22
- GIGABIT ETHERNET 23
- Wideband CMTS Components 24
- Cisco Wideband SIP 25
- Cisco Wideband SPA 25
- SPA-24XDS-SFP 25
- Receive optical bore 26
- Transmit optical bore 26
- Bail clasp 26
- Dust plug 26
- External Edge QAM Device 27
- Harmonic NSG 9116 28
- Harmonic NSG 9000 28
- Wideband CMTS Components 29
- Wideband Cable Modems 30
- Wideband Cable Modems 31
- DOCSIS Stateful Switchover 35
- Edge QAM Redundancy 37
- Wideband Channel Bonding 39
- Wideband Channel Bonding 40
- Modular CMTS 42
- Cost Effective Architecture 43
- Multiservice Architecture 44
- MAC Domains 44
- Addressing 45
- Security 45
- Quality of Service 46
- Wideband CMTS Configuration 49
- Wideband CMTS Configuration 50
- Primary Bonding Group ID 55
- Bonded Channel Enable 55
- Secondary Bonding Group ID 56
- Supported MIBs 58
- Known Restrictions 58
- Known Restrictions 59
- Components 61
- Monitoring Wideband SIPs 62
- Monitoring Wideband SPAs 63
- Monitoring Wideband Channels 66
- Monitoring RF Channels 70
- • show cable modem errors 71
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