Cisco uBR7100 Series - Cisco IOS Release 12.2(4)XF
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Table Of Contents
Release Notes for Cisco uBR7100 Series
for Cisco IOS Release 12.2 XFOverview of Cisco Universal Broadband Routers
Cisco uBR7100 Series Universal Broadband Routers
Cisco uBR7111 and Cisco uBR7111E Universal Broadband Routers
Cisco uBR7114 and Cisco uBR7114E Universal Broadband Routers
Universal Broadband Router Overview
Determining Your Software Release
Upgrading to a New Software Release
No New Hardware Features in Release 12.2(4)XF1
New Software Features in Release 12.2(4)XF1
Cable Interface Setup Facility
Cable Source Verification Feature
Internal Modem Configuration File Editor
Link Up/Down Traps Support (RFC 2233)
MPLS VPN Support for Subinterfaces
Overlapping Subinterface IP Addresses
Spectrum Management and Dynamic Upstream Modulation
Limitation on Vendor-Specific Information in the DOCSIS Configuration File
Hot-Standby 1+1 Redundancy Not Supported
IS-IS Not Supported on Cable Interfaces
Configuring the Routing Protocol Causes a Reset of the Cable Modems
Open Caveats for Release 12.2(4)XF1
Closed and Resolved Caveats for Release 12.2(4)XF1
Cisco IOS Software Documentation Set
Release 12.2 Documentation Set
Obtaining Technical Assistance
Contacting TAC by Using the Cisco TAC Web Site
Release Notes for Cisco uBR7100 Series
for Cisco IOS Release 12.2 XF
December 26, 2001
Cisco IOS Release 12.2(4)XF1
OL-2112-01
These release notes for the Cisco uBR7100 series universal broadband routers document the cable-specific, early deployment 12.2 XF train, describing the enhancements and caveats provided in Cisco IOS Release 12.2(4)XF1. These release notes are updated with each release in the train. For a list of the software caveats that apply to Cisco IOS Release 12.2(4)XF1, see the "Caveats" section.The 12.2 XF train is an interim release train that provides a migration path for DOCSIS 1.1 features from the previous DOCSIS 1.0 and DOCSIS 1.0+ releases. Cisco IOS Release 12.2(4)XF1 includes a selected subset of the features supported for the Cisco uBR7100 series routers in Cisco IOS Release 12.1 EC and adds support for DOCSIS 1.1 operation.
Note
Cisco IOS Release 12.2(4)XF1 does not include support for telco-return images.
Contents
These release notes describe the following topics:
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Introduction
For information on new features and Cisco IOS commands supported by Cisco IOS Release 12.2(4)XF1, see the "New and Changed Information" section and the "Related Documentation" section.
Overview of Cisco Universal Broadband Routers
The Cisco uBR7100 series universal broadband routers—the Cisco uBR7111, Cisco uBR7111E, Cisco uBR7114, and Cisco uBR7114E—are based on the Data-over-Cable Service Interface Specification (DOCSIS) standards and designed to be installed at small cable operators and multiple dwelling unit (MDU) operators to enable them to offer services such as e-mail, high-speed Internet access, voice, and digital video over a bidirectional cable television and IP backbone network. The universal broadband routers function as the cable modem termination system (CMTS) for subscriber-end devices such as Cisco uBR905, Cisco uBR924, and Cisco uBR925 cable access routers, and other DOCSIS-compliant cable modems (CMs) and set-top boxes (STBs).
Both the Cisco uBR7100 series and Cisco uBR7200 series universal broadband routers allow two-way transmission of digital data and Voice over IP (VoIP) traffic over a hybrid fiber-coaxial (HFC) network. The Cisco uBR7100 series routers support IP routing with a wide variety of protocols and WAN interfaces selections.
Cisco IOS Release 12.2(4)XF1 supports the Cisco uBR7111, Cisco uBR7111E, Cisco uBR7114, and Cisco uBR7114E universal broadband routers.
Cisco uBR7100 Series Universal Broadband Routers
The Cisco uBR7100 series routers provide a fixed set of WAN and LAN interfaces with a combination of fixed and modular interfaces, allowing both flexibility and simplicity in configuration. Each Cisco uBR7100 series router includes one modular single-width port adapter, one integrated cable interface with an internal upconverter, and two integrated Fast Ethernet ports. The cable interface is based on the Cisco uBR-MC14C cable interface line card and is not field-replaceable.
The Cisco uBR7100 series routers support IP routing through the following optional WAN and LAN port adapters: Ethernet, Fast Ethernet, serial, High-Speed Serial Interface (HSSI), Packet over SONET (POS) OC-3c, and Asynchronous Transfer Mode (ATM) media. For more information, see Table 5.
Depending on the model, the Cisco uBR7100 series routers support the following two standards:
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The Cisco uBR7100 series offers the following models:
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Cisco uBR7111 and Cisco uBR7111E Universal Broadband Routers
The Cisco uBR7111 and Cisco uBR7111E provide the following major hardware features:
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Cisco uBR7114 and Cisco uBR7114E Universal Broadband Routers
The Cisco uBR7114 and Cisco uBR7114E provide the following major hardware features:
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Universal Broadband Router Overview
Table 1 provides a quick overview of the major hardware features of the two universal broadband routers.
Early Deployment Releases
These release notes describe the Cisco uBR7100 series universal broadband routers for Cisco IOS Release 12.2(4)XF1. Release 12.2 XF is an early deployment (ED) release based that contains fixes to software caveats as well as support for new Cisco hardware and software features. Feature support is cumulative from release to release, unless otherwise noted.
Cisco IOS Release 12.2(4)XF1 supports a selected subset of the hardware and software features that were released in Cisco IOS Release 12.1 EC for the Cisco uBR7100 series universal broadband routers. Table 2 lists the features supported by the Cisco uBR7100 series in Cisco IOS Release 12.2(4)XF1.
Table 2 Early Deployment (ED) Releases for the Cisco uBR7100 Series
AvailabilityCisco IOS
Release 12.2(4)XF1•
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1 Only major features are listed.
2 MIB = Management Information Base
3 TLV = Type/Length/Value
4 BE = Best Effort
5 UGS = Unsolicited Grant Service
6 UGS-AD = Unsolicited Grant Service with Activity Detection
7 rtPS = Real-Time Polling Service
8 DSC = Dynamic Service Change
9 PHS = Payload Header Suppression
10 DS = Downstream
11 DHCP = Dynamic Host Configuration Protocol, TOD = Time of Day, TFTP = Trivial File Transfer Protocol
12 MPLS = Multiprotocol Label Switching
13 VPN = Virtual Private Network
14 NAT/PAT = Network Address Translation/Port Address Translation
15 ARP = Address Resolution Protocol
16 CLI = command line interface
Unsupported Features
Table 3 lists the features that are not supported in Cisco IOS Release 12.2(4)XF1, along with the most recent, recommended Cisco IOS Release that does support that particular feature for the Cisco uBR7200 series routers.
System Requirements
This section describes the system requirements for Cisco IOS Release 12.2(4)XF1 and includes the following sections:
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Memory Recommendations
Table 4 displays the memory recommendations of the Cisco IOS feature sets for the Cisco uBR7100 series universal broadband routers for Cisco IOS Release 12.2(4)XF1. Cisco uBR7100 series routers are available with a 16-MB or 20-MB Type II PCMCIA Flash memory card.
The image subset legend for Table 4 is as follows:
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System Interoperability
This section clarifies the operation of certain features in the Cisco uBR7100 series universal broadband routers.
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DOCSIS baseline privacy interface (BPI) gives subscribers data privacy across the RF network, encrypting traffic flows between the CMTS and CM. BPI ensures that a CM, uniquely identified by its Media Access Control (MAC) address, can obtain keying material for only those services to which it has authorized access.
To enable BPI, choose software at both the CMTS and CM that support the mode of operation. For the Cisco uBR7100 series software, choose an image with "k8" in its file name or BPI in the feature set description.
The CM must also support BPI. CMs must have factory-installed RSA private/public key pairs to support internal algorithms to generate key pairs prior to first BPI establishment. BPI must be enabled using the DOCSIS configuration file.
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The Cisco uBR7100 series interoperates with DOCSIS (Cisco uBR7111 and Cisco uBR7114) or Euro-DOCSIS (Cisco uBR7111E and Cisco uBR7114E) two-way CMs that support basic Internet access, VoIP, or Virtual Private Networks (VPNs). Cisco IOS Release 12.2(4)XF1 does not support telco-return CMs/STBs.
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The Cisco uBR7100 series supports the following DOCSIS 1.0 quality of service (QoS) extensions:
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Supported Hardware
Cisco IOS Release 12.2(4)XF1 supports the following Cisco uBR7100 series routers:
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Port Adapter Cards
Table 5 lists and describes the port adapters supported by Cisco uBR7100 series routers in Cisco IOS Release 12.2(4)XF1.
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Table 5 Cisco uBR7100 Series Port Adapter Releases
Ethernet
PA-4E—4-port Ethernet 10BASE-T port adapter
12.2(4)XF1
PA-8E—8-port Ethernet 10BASE-T port adapter
12.2(4)XF1
Fast Ethernet
PA-FE-TX—1-port 100BASE-TX Fast Ethernet port adapter
12.2(4)XF1
PA-FE-FX—1-port 100BASE-FX Fast Ethernet port adapter
12.2(4)XF1
PA-2FE-TX—2-port 100BASE-TX Fast Ethernet port adapter
12.2(4)XF1
PA-2FE-FX—2-port 100BASE-FX Fast Ethernet port adapter
12.2(4)XF1
Serial
PA-E3—1-port high-speed serial E3 interface port adapter
12.2(4)XF1
PA-T3—1-port T3 serial interface port adapter
12.2(4)XF1
PA-T3+—1-port T3 serial interface port adapter enhanced
12.2(4)XF1
PA-2E3—2-port high-speed serial E3 interface port adapter
12.2(4)XF1
PA-2T3—2-port T3 serial interface port adapter
12.2(4)XF1
PA-2T3+—2-port T3 serial interface port adapter enhanced
12.2(4)XF1
PA-4T+—4-port synchronous serial port adapter
12.2(4)XF1
PA-4E1G-75—4-port unbalanced (75-ohm) E1-G.703/G.704 synchronous serial port adapter
12.2(4)XF1
PA-4E1G-120—4-port balanced (120-ohm) E1-G.703/G.704 synchronous serial port adapter
12.2(4)XF1
PA-8T-232—8-port EIA/TIA-232 synchronous serial port adapter
12.2(4)XF1
PA-8T-V35—8-port V.35 synchronous serial port adapter
12.2(4)XF1
PA-8T-X21—8-port X.21 synchronous serial port adapter
12.2(4)XF1
PA-MC-2T1—2-port multichannel DS1 Integrated Services Digital Network (ISDN) Primary Rate Interface (PRI) single-wide port adapter
12.2(4)XF1
Serial (continued)
PA-MC-4T1—4-port multichannel DS1 ISDN PRI single-wide port adapter
12.2(4)XF1
HSSI
PA-H—1-port HSSI port adapter
12.2(4)XF1
PA-2H—2-port HSSI port adapter
12.2(4)XF1
ATM
PA-A3-OC3MM—1-port OC-3c ATM, PCI-based multimode port adapter
12.2(4)XF1
PA-A3-OC3SMI—1-port OC-3c ATM, PCI-based single-mode intermediate reach port adapter
12.2(4)XF1
PA-A3-OC3SML—1-port OC-3c ATM, PCI-based single-mode long reach port adapter
12.2(4)XF1
PA-A3-8T1/IMA—ATM inverse multiplexer over ATM port adapter with 8 T1 ports
12.2(4)XF1
Packet over SONET
PA-POS-OC3SMI—1-port OC3 single-mode, intermediate reach port adapter
12.2(4)XF1
1 The number in this column indicates the Cisco IOS release in which the interface was introduced in this train.
Determining Your Software Release
To determine the version of Cisco IOS software running on the Cisco uBR7100 series universal broadband router, log in to the router and enter the show version EXEC command:
Router> show versionCisco Internetwork Operating System SoftwareIOS (tm) 12.2 XF Software (ubr7100-k1p-mz), Version 12.2(4)XF1, RELEASE SOFTWAREUpgrading to a New Software Release
For general information about upgrading to a new software release, see Cisco IOS Upgrade Ordering Instructions located at http://www.cisco.com/warp/public/cc/pd/iosw/prodlit/957_pp.htm.
Feature Set Tables
The Cisco IOS software is packaged in feature sets consisting of software images—depending on the platform. Each feature set contains a specific set of Cisco IOS features.
Table 6 lists the features and feature sets supported by the Cisco uBR7100 series in Cisco IOS Release 12.2(4)XF1 and uses the following conventions:
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Table 6 Feature List by Feature Sets for Cisco uBR7100 Series Universal Broadband Routers
IP Plus
with BPIDHCP2 Server
Yes
Yes
DRP3 Server Agent
Yes
Yes
Easy IP (Phase 1)
Yes
Yes
Hot-Standby 1+1 Redundancy
No
No
No
No
IP Type of Service and Precedence for GRE6 Tunnels
Yes
Yes
IP Enhanced IGRP7 Route Authentication
Yes
Yes
MxU Bridging
No
No
Per-Modem Filters
Yes
Yes
Cable Interface Setup Facility
Yes
Yes
Cable Monitor
No
No
Cisco Call History MIB Command Line Interface
Yes
Yes
DOCSIS Ethernet MIB Objects Support (RFC 2665)
Yes
Yes
DOCSIS OSSI8 Objects Support (RFC 2233)
Yes
Yes
Dynamic Ranging Support
Yes
Yes
Enhanced Modem Status Display
Yes
Yes
Enhanced Per-Modem Error Counter
Yes
Yes
Internal Modem Configuration File Editor
Yes
Yes
LinkUp/Down Traps Support (RFC 2233)
Yes
Yes
RF Interface MIB
Yes
Yes
Yes
Yes
SNMP Cable Modem Remote Query
Yes
Yes
Bidirectional PIM11
No
No
IP Multicast Load Splitting Across Equal-Cost Paths
No
No
IP Multicast over ATM12 Point-to-Multipoint Virtual Circuits
No
No
IP Multicast over Token Ring LANs
No
No
Stub IP Multicast Routing
No
No
Dynamic Upstream Modulation
Yes
Yes
DOCSIS 1.0+13 QoS Enhancements
Yes
Yes
Downstream QoS Handling
Yes
Yes
Downstream Traffic Shaping
Yes
Yes
Dynamic SID Support
Yes
Yes
Dynamic Map-Advance
Yes
Yes
Improved Upstream QoS
Yes
Yes
Multiple SID Support (static only)
Yes
Yes
Network-Based Application Recognition
No
No
QoS Configuration
Yes
Yes
QoS Profile Enforcement
Yes
Yes
Read/Create Implementation of QoS
Yes
Yes
RTP14 Header Compression
Yes
Yes
Telco Return
No
No
Time of Day (ToD) Server
Yes
Yes
Upstream Address Verification
Yes
Yes
Upstream Traffic Shaping
Yes
Yes
Automated Double Authentication
Yes
Yes
BPI Encryption
Yes
Yes
Cable Modem and Multicast Authentication using RADIUS15
No
No
Cisco IOS Firewall Enhancements
Yes
Yes
Dynamic Mobile Hosts
Yes
Yes
HTTP16 Security
Yes
Yes
Named Method Lists for AAA17 Authorization & Accounting
Yes
Yes
Per-Modem and Per-Host Access List Support
Yes
Yes
Per-User Configuration
Yes
Yes
Reflexive Access Lists
Yes
Yes
Turbo Access Control Lists
No
No
Vendor-Proprietary RADIUS Attributes
No
No
Fast-Switched Policy Routing
Yes
Yes
MPLS VPN Support for Subinterfaces
Yes
Yes
PAD18 Subaddressing
Yes
Yes
Bandwidth Allocation Control Protocol (BACP)
Yes
Yes
Enhanced Local Management Interface (ELMI)
Yes
Yes
Frame Relay Enhancements
Yes
Yes
Frame Relay MIB Extensions
Yes
Yes
Frame Relay Router ForeSight
Yes
Yes
ISDN19 Advice of Charge
Yes
Yes
ISDN Caller ID Callback
Yes
Yes
ISDN Multiple Switch Type
Yes
Yes
ISDN NFAS20
Yes
Yes
Microsoft Point-to-Point Compression (MPPC)
Yes
Yes
Yes
Yes
VPDN23 MIB and Syslog Facility
Yes
Yes
X.25 Enhancements
Yes
Yes
Yes
Yes
1 The number in the "In" column indicates the Cisco IOS release in which the feature was introduced in this release train. If a cell in this column is empty, the feature was included in the initial base release.
2 DHCP = Dynamic Host Configuration Protocol
3 DRP = Director Response Protocol
4 HSRP = Hot-Standby Routing Protocol
5 ISL = Inter-Switch Link
6 GRE = generic routing encapsulation
7 IGRP = Interior Gateway Routing Protocol
8 OSSI = Operations Support System Interface
9 SNMPv2 = Simple Network Management Protocol version 2
10 SNMPv3 = Simple Network Management Protocol version 3
11 PIM = Protocol Independent Multicast
12 ATM = Asynchronous Transfer Mode
13 The DOCSIS 1.0+ QoS Enhancements is a set of Cisco's Quality of Service extensions to DOCSIS 1.0 to enable basic VoIP service over the DOCSIS link before DOCSIS 1.1 becomes available. The main enhancements include support for dynamic creation and teardown of flows during voice calls, support for one new unsolicited grant service (UGS) slot scheduling mechanism for voice slots, and per IP-precedence rate shaping on the downstream.
14 RTP = Real-Time Transport Protocol
15 RADIUS = Remote Access Dial-In User Service
16 HTTP = Hypertext Transfer Protocol
17 AAA =authentication, authorization, and accounting
18 PAD = packet assembler/disassembler
19 ISDN = Integrated Services Digital Network
20 NFAS = non-facility-associated signaling
21 BRI = Basic Rate Interface
22 PRI = Primary Rate Interface
23 VPDN = virtual private dial-up network
24 PVC = permanent virtual circuit
25 SVC = switched virtual circuit
New and Changed Information
The following sections list the new hardware and software features supported by the Cisco uBR7100 series routers for Cisco IOS Release 12.2 XF.
No New Hardware Features in Release 12.2(4)XF1
There are no new hardware features supported by the Cisco uBR7100 series routers in Cisco IOS Release 12.2(4)XF1.
New Software Features in Release 12.2(4)XF1
The following new software features are supported by the Cisco uBR7100 series routers in Cisco IOS Release 12.2(4)XF1.
DOCSIS 1.0 and 1.0+ Support
Cisco IOS Release 12.2(4)XF1 provides support for the original DOCSIS 1.0 standard that provides for basic best-effort data traffic and Internet access over the coaxial cable network. The DOCSIS 1.0+ extensions provided Quality of Service (QoS) enhancements for real-time traffic, such as voice calls, in anticipation of full DOCSIS 1.1 support.
Cisco IOS Release 12.2(4)XF1 interoperates seamlessly with both DOCSIS 1.0 and 1.0+ cable modems and set-top boxes.
DOCSIS 1.1 Support
Cisco IOS Release 12.2(4)XF1 provides support for the new DOCSIS 1.1 standard for the Cisco Release 12.2(4)XF1 series routers. DOCSIS 1.1 modifies the DOCSIS 1.0 specification to provide better performance, in particular for real-time traffic such as voice calls.
The DOCSIS 1.1 specification provides the following functional enhancements over DOCSIS 1.0 coaxial cable networks:
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DOCSIS 1.1 Quality of Service
The DOCSIS 1.1 QoS framework is based on the following objects:
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In DOCSIS 1.1, the basic unit of QoS is the service flow, which is a unidirectional sequence of packets transported across the RF interface between the cable modem and CMTS. A service flow is characterized by a set of QoS parameters such as latency, jitter, and throughput assurances.
Every cable modem establishes a primary service flow in both the upstream and downstream directions. The primary flows maintain connectivity between the cable modem and CMTS at all times.
In addition, a DOCSIS 1.1 cable modem can establish multiple secondary service flows. The secondary service flows can either be permanently created (they persist until the cable modem is reset or powered off) or they can be created dynamically to meet the needs of the on demand traffic being transmitted.
Each service flow has a set of QoS attributes associated with it. These QoS attributes define a particular class of service and determine characteristics such as the maximum bandwidth for the service flow and the priority of its traffic. The class of service attributes can be inherited from a preconfigured CMTS local service class (class-based flows), or they can be individually specified at the time of the creation of the service flow.
Each service flow has multiple packet classifiers associated with it, which determine the type of application traffic allowed to be sent on that service flow. Each service flow can also have a Payload Header Suppression (PHS) rule associated with it to determine which portion of the packet header will be suppressed when packets are transmitted on the flow.
In Cisco IOS Release 12.2(4)XF1, the following new or enhanced software features are implemented for DOCSIS 1.1 functionality. (For more information, see the feature module DOCSIS 1.1 for Cisco Release 12.2(4)XF1 Series Universal Broadband Routers).
Cable ARP and Proxy ARP
The cable arp and cable proxy-arp commands control whether the Cisco Release 12.2(4)XF1 series router allows ARP requests on the cable interfaces and whether the router serves as a proxy ARP server for cable modems, so that cable modems on the same subnet can communicate with each other, without having to send the traffic through the Cisco Release 12.2(4)XF1 series router.
Cable Flap List
The cable flap list is a patented tool that is incorporated in the Cisco IOS software for the Cisco Release 12.2(4)XF1 series universal broadband routers for troubleshooting cable modem connectivity problems. The flap list tracks cable modems that have intermittent connectivity problems (known as "flapping") that could indicate a problem with the cable modem or with the upstream or downstream portion of the cable plant.
The flap-list feature does not require any special polling or data transmissions but instead monitors the registration and station maintenance activity that is already performed over any network that conforms to Data-over-Cable Service Interface Specifications (DOCSIS). The router, therefore, collects its flap-list data without creating additional packet overhead and without impacting network throughput and performance.
The flap-list feature tracks reinsertions (a cable modem re-registers more frequently than a user-specified insertion time, hits and misses (a cable modem responds or does not respond to the DOCSIS MAC-layer "keepalive" messages that the router sends out), and the cable modem's upstream transmission power level adjustments.
Cable Intercept Command
The cable intercept command forwards all traffic to and from a particular CM to a data collector located at particular User Datagram Protocol (UDP) port. This command can be used to comply with the United States Federal Communications Assistance for Law Enforcement Act (CALEA) and other law enforcement wiretap requirements for voice communications.
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Cable Interface Setup Facility
The Cable Interface Setup Facility is an alternative mechanism to enable or configure Cisco Release 12.2(4)XF1 series parameters. The setup facility supports automated configuration of upstream parameters.
In earlier releases, upstream ports were put in a default shut-down state after the setup facility was run. You had to use the CLI to configure a fixed frequency or create a spectrum group, assign an interface to it, and enable each upstream port on a cable interface line card. The setup facility now supports configuring and enabling upstream parameters.
In the following example, the upstream parameters for a cable interface line card in slot 5 are configured and enabled. Press Return to accept the default.
Do you want to configure Cable 5/0 interface? [no]: yes Downstream setting frequency: 531000000 For cable upstream [0] Shut down this upstream? [yes/no]: no Frequency: 33808000 Would you like to configure the DHCP server? [yes/no]: yes IP address for the DHCP server [X.X.X.X]: 10.0.0.2 Configure IP on this interface? [yes]: IP address for this interface [10.20.133.65]: Subnet mask for this interface [255.0.0.0]: 255.255.255.248 Class A network is 10.0.0.0, 29 subnet bits; mask is /29In this example, the input above generates the following command interface script:
interface Cable 5/0 no shutdown cable downstream frequency 531000000 no shutdown cable downstream modulation 64qam cable downstream annex B cable downstream interleave-depth 32 no cable upstream 0 shutdown cable upstream 0 frequency 33808000 cable helper-address 10.0.0.2 ip address 10.20.133.65 255.255.255.248
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Cable Source Verification Feature
The cable source-verify command helps to prevent the spoofing of IP addresses by CMs or their CPE devices by verifying that the upstream packets coming from each CM are known to be associated with the IP address in that packet. Packets with IP addresses that do not match those associated with the CM are dropped.
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DHCP/TOD/TFTP Server Support
The Cisco uBR7100 series routers support onboard Dynamic Host Configuration Protocol (DHCP), Time-of-Day (ToD), and TFTP servers that are compliant with the DOCSIS requirements. This allows the Cisco uBR7100 series routers to provide cable modems with IP address information, to supply an RFC 868-compliant time-of-day timestamp, and to download a DOCSIS configuration file, without requiring separate, external servers.
Dynamic Map-Advance
The Dynamic Map-Advance feature improves the upstream throughput for a cable modem. This feature enables the map-advance to be dynamic and self-adjusting to propagation delay, even for the furthest cable modem in the plant.
Dynamic Mobile Hosts
This feature addresses a security hole that occurs when the Cisco uBR7100 router supports mobile hosts. (Mobile host are hosts that can move from one modem to another modem.) Anyone who knows the MAC address of a mobile host can "fake" the mobile host, thereby causing denial of access for the real mobile host.
To avoid this security hole, the Dynamic Mobile Hosts feature pings the mobile host on the old SID to verify that the host has indeed been moved.
Dynamic Ranging Support
The clear cable modem <mac-address> reset command sends a "Ranging Abort" message instead of just removing the SID. To indicate this, the modem state—Reset (display: resetting)— has been introduced into the modem state list. A modem is deprovisioned when moving into this state as if going offline. Move the modem to the Continue Ranging list. If a ranging request is received from the modem, send a "Ranging Abort" message. Continue until an "Initial Ranging" message is received or until normal timeout (16 attempts). If the modem does not go back to initial ranging, set it to offline.
The Reset modem state may show as follows in the output of show cable modem:
Cable4/0/U1 80 resetting 3575 0.25 3 0 10.30.160.26 0050.7318.e965This is an intermediate state. A modem will not be in this state for more than a few seconds; if the modem does not respond, it may be in this state for up to 30 seconds. The subsequent modem state is offline.
Dynamic Upstream Modulation
The Dynamic Upstream Modulation feature reduces the risks associated with transitioning to QAM16 modulation in the return path, and provides assurance that subscribers remain online and connected during periods of return-path impairments.
This new feature actively monitors the signal-to-noise-ratio (SNR) and forward error correction (FEC) counters in the active return path of each upstream port. The software tracks whether the current upstream channel signal quality can adequately support the higher modulation scheme configured, and proactively adjusts to the more robust Quadrature Phase-Shift Keying (QPSK) modulation scheme when necessary. When return-path spectrum conditions improve, the software proactively returns the upstream channel to the higher-modulation quadrature amplitude modulation (QAM) scheme. This is done through modulation profiles supported in Cisco IOS, which can be configured in a variety of ways to support the unique environment at each user's facility.
The Dynamic Upstream Modulation feature can be configured on interfaces with fixed upstream frequencies or on interfaces with spectrum groups assigned. Cisco IOS provides one preconfigured modulation profile resident in memory, which defines a typical profile for QPSK modulation. In order to use the Dynamic Upstream Modulation feature, a second profile must be created that is unique from the first profile and typically provides a higher modulation scheme.
The cable upstream <n> modulation-profile cable interface command configures the cable interface for the desired modulation profiles.
Dynamic Upstream Modulation can be used along with spectrum groups. If a Cisco uBR-MC16S card is used and the Dynamic Upstream Modulation and spectrum groups are configured on the same interface, the modulation switchover is chosen as the first corrective action, followed by a frequency hop, and finally a reduction in channel width. The user can configure how the higher-modulation profile is selected by setting priorities with the cable upstream hop-priority frequency bandwidth modulation command.
For more information on the Dynamic Upstream Module feature, including information on creating modulation profiles using the cable modulation-profile command, see the Cisco Release 12.2(4)XF1 Dynamic Upstream Modulation feature module. For more information on the above commands, see the documents listed in the "Related Documentation" section.
Internal Modem Configuration File Editor
This feature adds support for internal DOCSIS cable modem configuration file storage and generation. The cable modem configuration file is generated and stored as part of the Cisco IOS configuration file. The DOCSIS configuration files are not stored in Flash memory but are automatically generated when requested for TFTP downloads to cable modems.
Link Up/Down Traps Support (RFC 2233)
The objects in the varbind list, based on Internet Engineering Task Force (IETF) standard, are defined in IF-MIB. Since IF-MIB supports subinterfaces, all objects in this varbind list are also supported for subinterfaces. The feature allows the user to base the Link Up/Down trap varbind list on a Cisco-specific or IETF standard with a new CLI configuration command:
snmp-server link-trap [cisco | ietf]
The default is a Cisco-specific link trap (snmp-server link-trap cisco). The user can switch between Cisco and IETF standard.
"MAX-CPE" CLI Override
The following cable-specific configuration command provides a way to override the MAX-CPE parameter in the cable modem's DOCSIS configuration file:
[no] cable modem max-cpe [<n> | unlimited]
When set to unlimited or if n is larger than the "MAX-CPE" value in the configuration file of a cable modem, it overrides the config file value.
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MPLS VPN Support for Subinterfaces
Cisco IOS Release 12.2(4)XF1 includes MPLS support as part of its VPN offerings for cable subinterfaces. The software offers enhancements made to tags placed on the fronts of packets that contain forwarding information used to make switching decisions for cable interfaces and bundles. This tag switching infrastructure combines advanced routing protocol capabilities to define IP VPNs by selectively advertising IP reachability information to just those subscribers within the same VPN or extranet on a cable interface.
The MPLS-VPN approach of creating VPNs for individual Internet service providers (ISPs) requires subinterfaces to be configured on cable interfaces. One subinterface is required for each ISP. The subinterfaces are tied to VPN Routing Forwarding (VRF) tables for respective ISPs.
For more feature information, see the Cisco Release 12.2(4)XF1 Series MPLS VPN Cable Enhancements feature module. For information on feature modules, see the "Feature Modules" section.
Overlapping Subinterface IP Addresses
Multiprotocol Label Switching (MPLS)-based Virtual Private Networks (VPNs), which are created in layer 3, provide privacy and security by constraining the distribution of a VPN's routes to those routers that are members of the VPN only, and by using MPLS forwarding. Each ISP's VPN is insulated from all others sharing the HFC and IP-over-cable infrastructure. MPLS VPN enforces traffic separation by assigning a unique VPN Routing/Forwarding (VRF) instance to each VPN. A VRF instance consists of an IP routing table, a derived forwarding table, a set of interfaces that use the forwarding table, and a set of rules and routing protocols that determine what is in the forwarding table.
Earlier Cisco IOS releases assumed that IP addresses were unique, but it is possible with an MPLS VPN to configure overlapped IP addresses within a VRF. A configuration of overlapped IP addresses could have caused errors. Cisco IOS Release 12.1(4)CX and subsequent releases support a configuration of overlapping IP addresses for subinterfaces. The same IP subnet can be configured for CPEs on different VRFs using a Cisco Release 12.2(4)XF1 to configure an MPLS VPN. See also the "MPLS VPN Support for Subinterfaces" section.
The following CLI commands have been updated to support overlapping IP addresses on subinterfaces:
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cable host <ipaddr> [no] access-group <acl>
cable device <ipaddr> [no] access-group <acl>
show cable host <ipaddr> access-group
show cable device <ipaddr> access-group
clear cable host <ipaddr>•
cable host [vrf <vrfname>] <ipaddr> [no] access-group <ac >
cable device [vrf <vrfname> <ipaddr> [no] access-group <acl>
show cable host [vrf <vrfname>] <ipaddr> access-group
show cable device [vrf <vrfname>] <ipaddr> access-group
clear cable host [vrf <vrfname>] <ipaddr>Spectrum Management and Dynamic Upstream Modulation
Spectrum management allows the Cisco Release 12.2(4)XF1 series router to sense downstream and upstream plant impairments, report them to a management entity, and automatically mitigate them by changing to a different frequency using a blind hopping algorithm.
The Dynamic Upstream Modulation feature creates two modulation profiles for and upstream. The feature monitors the upstream channel signal quality and determines if the channel can support the primary modulation scheme. If noise or other impairments occur, the feature automatically adjusts to the most robust modulation scheme when necessary. When return path conditions improve, this feature returns the upstream channel to the higher modulation scheme that includes the modulation profile.
SNMP Cable Modem Remote Query
This feature provides a new MIB, CISCO-DOCS-REMOTE-QUERY-MIB, which, once implemented on a CMTS, facilitates SNMP polling of remote CMs. This MIB includes the configuration of the CMTS CM Poller, as well as status objects of remote CMs that are polled by the CMTS CM poller.
The following CLI command has been implemented for turning on the trap:
snmp-server enable cable cm-remote-query
Important Notes
The following sections contain important notes about Cisco IOS Release 12.2(4)XF1 that apply to Cisco uBR7100 series universal broadband routers.
Limitation on Vendor-Specific Information in the DOCSIS Configuration File
DOCSIS requires that when the cable modem sends its Registration Request (REG-REQ) message to the CMTS, it must include the configuration information found in the DOCSIS configuration file. This configuration information must include all vendor-specific information fields (VSIF). Because MAC-layer management messages, such as REG-REQ, have a maximum data size of 1522 bytes, this limits the amount of VSIF information that can be included in the DOCSIS configuration file.
In particular, the maximum packet size imposes a limit on the number of Cisco IOS CLI commands you can include as VSIF fields in the DOCSIS configuration file. The exact number of commands that will fit depends on the other information included in the file, as well as the length of each command.
If the REG-REQ message is larger than 1522 bytes, the cable modem will likely report errors similar to the following errors that appears on Cisco uBR900 series cable access routers:
%LINK-4-TOOBIG: Interface cable-modem0, Output packet size of 1545 bytes too big%LINEPROTO-5-UPDOWN: Line protocol on Interface cable-modem0, changed state to downIn addition, the CMTS will also report that the cable modem timed out during the registration process. If this occurs, you can try the following steps:
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For complete details on what is included in the REG-REQ message, see Chapter 6 of the current DOCSIS 1.1 specification (SP-RFIv1.1-I07-010829 or later).
Note
Hot-Standby 1+1 Redundancy Not Supported
The hot-standby 1+1 redundancy feature is not supported on any model of the Cisco uBR7100 series universal broadband router. The HCCP protocol therefore should not be configured on the cable interface using the hccp interface configuration commands.
IS-IS Not Supported on Cable Interfaces
The Intermediate System-to-Intermediate System (IS-IS) routing protocol is not supported on any cable interfaces.
Configuring the Routing Protocol Causes a Reset of the Cable Modems
Be aware that when configuring a routing protocol on a Cisco uBR7100 series cable interface, the Cisco IOS software must reset the interface to enable the change. This in turn causes all cable modems on that particular downstream to reinitialize, potentially interfering with data transmission on that downstream. Therefore, you should use the interface configuration commands, such as router rip, on a cable interface only when a minimum of subscribers would be affected.
MIBs
Current MIBs
To obtain lists of supported MIBs by platform and Cisco IOS release, and to download MIB modules, go to the Cisco MIB web site on Cisco.com at http://www.cisco.com/public/sw-center/netmgmt/cmtk/mibs.shtml.
Supported MIBs
The Cisco uBR7100 series universal broadband routers support the following categories of MIBs:
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The cable-specific MIBs are described in the following section. For information on the SNMP standard MIBs and Cisco's platform and network-layer enterprise MIBs, see Cisco's MIB web site at http://www.cisco.com/public/sw-center/netmgmt/cmtk/mibs.shtml.
Cable-Specific MIBs
Table 7 shows the cable-specific MIBs that are supported on the Cisco uBR7100 series universal broadband routers. The table also provides a brief description of each MIB's contents and the Cisco IOS software release in which the MIB was initially functional—earlier releases might have had unsupported prototype versions of the MIB; later releases might have added new attributes and functionality. Because of interdependencies, the MIBs must be loaded in the order given in the table.
Note
Deprecated MIBs
Old Cisco MIBs will be replaced in a future release. Currently, OLD-CISCO-* MIBs are being converted into more scalable MIBs without affecting existing Cisco IOS products or network management system (NMS) applications. You can update from deprecated MIBs to the replacement MIBs as shown in Table 8.
Note
Note
Caveats
Caveats describe unexpected behavior in Cisco IOS software releases. Severity 1 caveats are the most serious caveats; severity 2 caveats are less serious. Severity 3 caveats are moderate caveats, and only select severity 3 caveats are included in the caveats document.
This section only contains open and resolved caveats for the current Cisco IOS maintenance release.
For information on caveats in Cisco IOS Release 12.2, see Caveats for Cisco IOS Release 12.2, which lists severity 1 and 2 caveats and select severity 3 caveats for Cisco IOS Release 12.2 and is located on Cisco.com and the Documentation CD-ROM.
Caveat numbers and brief descriptions for Cisco IOS Release 12.2(4)XF1 are listed in this section. For details about a particular caveat, go to Bug Toolkit at:
http://www.cisco.com/cgi-bin/Support/Bugtool/launch_bugtool.pl
To access this location, you must have an account on Cisco.com. For information about how to obtain an account, go to the "Feature Navigator" section.
Note
Open Caveats for Release 12.2(4)XF1
No severity 1 or severity 2 caveats exist for Cisco IOS Release 12.2(4)XF1 for the Cisco uBR7100 series routers.
Closed and Resolved Caveats for Release 12.2(4)XF1
Cisco IOS Release 12.2(4)XF1 is the first release in the 12.2 XF train for the Cisco uBR7100 series routers but Table 9 shows the closed or resolved caveats that existed in previous releases that are also resolved in this release.
Table 9 Open Caveats for Release 12.2(4)XF1
CSCdw03863
Crash with watchdog timeout in IGMP Input process
Related Documentation
The following sections describe the documentation available for the Cisco uBR7100 series. These documents consist of hardware and software installation guides, Cisco IOS configuration guides and command references, system error messages, feature modules, and other documents.
Documentation is available as printed manuals or electronic documents, except for feature modules, which are available online on Cisco.com and the Documentation CD-ROM.
Use these release notes with these documents:
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Release-Specific Documents
The following documents are specific to Release 12.2 and are located on Cisco.com and the Documentation CD-ROM:
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Technical Documents
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On Cisco.com, beginning under the Service & Support heading:
Technical Documents: Cisco IOS Software Configuration: Cisco IOS Release 12.1: Release Notes: Caveats: Caveats for Release 12.2
On the Documentation CD-ROM:
Cisco Product Documentation: Cisco IOS Software Configuration: Cisco IOS Release 12.2: Caveats
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Platform-Specific Documents
The following documents are available for the Cisco uBR7100 series universal broadband routers on Cisco.com and the Documentation CD-ROM:
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On Cisco.com, beginning under the Service & Support heading:
Technical Documents: Documentation Home Page: Broadband Access: Cable: Cisco uBR7100 Series Universal Broadband Routers
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Technical Documents: Documentation Home Page: Broadband/Cable Solutions
On the Documentation CD-ROM:
Cisco Product Documentation: Broadband Access: Cable: Cisco uBR7100 Series Universal Broadband Routers
Note
Tips
http://www.cisco.com/univercd/cc/td/doc/product/cable/index.htm
Feature Modules
Feature modules describe new software enhancements, committed as features, supported by Cisco IOS Release 12.1(7)EC, and are updates to the Cisco IOS documentation set. A feature module consists of a brief overview of the feature, benefits, and configuration tasks, and a command reference. As updates, the feature modules are available online only. Feature-module information is incorporated in the next printing of the Cisco IOS documentation set.
On Cisco.com, beginning under the Service & Support heading:
Technical Documents: Documentation Home Page: Cisco IOS Software Configuration: Cisco IOS Release 12.1: New Feature Documentation
On the Documentation CD-ROM:
Cisco Product Documentation: Cisco IOS Software Configuration: Cisco IOS Release 12.1: New Feature Documentation: New Features in Release 12.1 T
Feature Navigator
Feature Navigator is a web-based tool that enables you to quickly determine which Cisco IOS software images support a particular set of features and which features are supported in a particular Cisco IOS image.
Feature Navigator is available 24 hours a day, 7 days a week. To access Feature Navigator, you must have an account on Cisco.com. If you have forgotten or lost your account information, e-mail the Contact Database Administration group at cdbadmin@cisco.com. If you do not have an account on Cisco.com, go to http://www.cisco.com/register and follow the directions to establish an account.
To use Feature Navigator, you must have a JavaScript-enabled web browser such as Netscape 3.0 or later, or Internet Explorer 4.0 or later. Internet Explorer 4.0 always has JavaScript enabled. To enable JavaScript for Netscape 3.x or Netscape 4.x, follow the instructions provided with the web browser. For JavaScript support and enabling instructions for other browsers, check with the browser vendor.
Feature Navigator is updated when major Cisco IOS software releases and technology releases occur. It contains feature information about mainline-, T-, S-, and P-trains. You can access Feature Navigator at the following URL:
Cisco IOS Software Documentation Set
The Cisco IOS software documentation set consists of the Cisco IOS configuration guides, Cisco IOS command references, and several other supporting documents. The Cisco IOS software documentation set is shipped with your order in electronic form on the Documentation CD-ROM, unless you specifically ordered the printed versions.
Documentation Modules
Each module in the Cisco IOS documentation set consists of one or more configuration guides and one or more corresponding command references. Chapters in a configuration guide describe protocols, configuration tasks, and Cisco IOS software functionality, and contain comprehensive configuration examples. Chapters in a command reference provide complete command syntax information. Use each configuration guide with its corresponding command reference.
On Cisco.com and the Documentation CD-ROM, two master hot-linked documents provide information for the Cisco IOS software documentation set.
On Cisco.com, beginning under the Service & Support heading:
Technical Documents: Cisco IOS Software Configuration: Cisco IOS Release 12.2: Configuration Guides and Command References
On the Documentation CD-ROM:
Cisco IOS Software Configuration: Cisco IOS Release 12.2: Configuration Guides and Command References
Release 12.2 Documentation Set
Note
On Cisco.com, beginning under the Service & Support heading:
Technical Documents: Cisco IOS Software Configuration: Cisco IOS Release 12.2: Configuration Guides and Command References
On the Documentation CD-ROM:
Cisco Product Documentation: Cisco IOS Software Configuration: Cisco IOS Release 12.2: Configuration Guides and Command References
Note
Note
Obtaining Documentation
The following sections provide sources for obtaining documentation from Cisco Systems.
World Wide Web
You can access the most current Cisco documentation on the World Wide Web at http://www.cisco.com. Translated documentation can be accessed at http://www.cisco.com/public/countries_languages.shtml.
Documentation CD-ROM
Cisco documentation and additional literature are available in a CD-ROM package, which ships with your product. The Documentation CD-ROM is updated monthly and may be more current than printed documentation. The CD-ROM package is available as a single unit or as an annual subscription.
Ordering Documentation
Cisco documentation is available in the following ways:
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http://www.cisco.com/cgi-bin/order/order_root.pl
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http://www.cisco.com/go/subscription
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Documentation Feedback
If you are reading Cisco product documentation on the World Wide Web, you can submit technical comments electronically. Click Feedback in the toolbar and select Documentation. After you complete the form, click Submit to send it to Cisco.
You can e-mail your comments to bug-doc@cisco.com.
To submit your comments by mail, for your convenience many documents contain a response card behind the front cover. Otherwise, you can mail your comments to the following address:
Cisco Systems, Inc.
Document Resource Connection
170 West Tasman Drive
San Jose, CA 95134-9883We appreciate your comments.
Obtaining Technical Assistance
Cisco provides Cisco.com as a starting point for all technical assistance. Customers and partners can obtain documentation, troubleshooting tips, and sample configurations from online tools. For Cisco.com registered users, additional troubleshooting tools are available from the TAC web site.
Cisco.com
Cisco.com is the foundation of a suite of interactive, networked services that provides immediate, open access to Cisco information and resources at anytime, from anywhere in the world. This highly integrated Internet application is a powerful, easy-to-use tool for doing business with Cisco.
Cisco.com provides a broad range of features and services to help customers and partners streamline business processes and improve productivity. Through Cisco.com, you can find information about Cisco and our networking solutions, services, and programs. In addition, you can resolve technical issues with online technical support, download and test software packages, and order Cisco learning materials and merchandise. Valuable online skill assessment, training, and certification programs are also available.
Customers and partners can self-register on Cisco.com to obtain additional personalized information and services. Registered users can order products, check on the status of an order, access technical support, and view benefits specific to their relationships with Cisco.
To access Cisco.com, go to the following web site:
http://www.cisco.com
Technical Assistance Center
The Cisco TAC web site is available to all customers who need technical assistance with a Cisco product or technology that is under warranty or covered by a maintenance contract.
Contacting TAC by Using the Cisco TAC Web Site
If you have a priority level 3 (P3) or priority level 4 (P4) problem, contact TAC by going to the TAC web site:
http://www.cisco.com/tac
P3 and P4 level problems are defined as follows:
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In each of the above cases, use the Cisco TAC web site to quickly find answers to your questions.
To register for Cisco.com, go to the following web site:
http://www.cisco.com/register/
If you cannot resolve your technical issue by using the TAC online resources, Cisco.com registered users can open a case online by using the TAC Case Open tool at the following web site:
http://www.cisco.com/tac/caseopen
Contacting TAC by Telephone
If you have a priority level 1(P1) or priority level 2 (P2) problem, contact TAC by telephone and immediately open a case. To obtain a directory of toll-free numbers for your country, go to the following web site:
http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml
P1 and P2 level problems are defined as follows:
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Feedback