Installation guide

Release Notes for Cisco uBR7200 Series for Cisco IOS Release 12.1 T

78-10643-04 Rev. B0

New and Changed Information

Redirect-Number Support for RADIUS and TACACS+ Servers

If a telco-return customer is being authenticated by a RADIUS or TACACS+ server, and if the number

dialed by the cable modem is being redirected to another number for authentication, Cisco IOS

Release 12.1(1a)T1 can include the original number in the information sent to the authentication server.

The original number can be sent as a Cisco Vendor Specific Attribute (VSA) for TACACS+ servers and

as RADIUS Attribute 93 (Ascend-Redirect-Number) for RADIUS servers. This allows the service

provider to determine whether the customer dialed a number that requires special billing arrangements,

such as a toll-free number.

This feature is enabled with the aaa nas redirected-station command and disabled with the no aaa nas

redirected-station command; other AAA configuration commands also apply as appropriate. The

RADIUS Attribute 93 is sent by default; to also send a VSA attribute for TACACS+ servers, use the

radius-server vsa send accounting and radius-server vsa send authentication commands. To

configure the RADIUS server to use RADIUS Attribute 93, add the non-standard option to the

radius-server host command.

Note This feature is valid only when using port adapters that are configured for a T1 or E1 ISDN

PRI or BRI interface. In addition, the telco switch performing the number redirection must

be able to provide the redirected number in the Q.931 Digital Subscriber Signaling System

Network Layer.

Cable Subinterfaces and Interface Bundling

Cisco uBR7200 series software supports the definition of logical network layer interfaces over a cable

physical interface or a bundle of cable interfaces. The system also supports subinterface creation on

either a physical cable interface or a bundle of cable interfaces. This allows a service provider to share

one IP subnet across multiple cable interfaces that are grouped into a cable interface bundle. All of the

cable interfaces on a Cisco uBR7200 Series Universal Broadband Router can be grouped into a single

bundle so that only one subnet is required for each router. This eliminates the requirement that a

separate IP subnet be used for each individual cable interface. This in turn avoids the performance,

memory, and security problems that result if a bridging solution is used to manage subnets, especially

for a large number of subscribers.

Note Cable interface bundling is applicable only in two-way cable configurations. It is not

supported in telco-return configurations.

The CMTS administrator can perform the following tasks:

• Define subinterfaces on a cable physical interface and assign Layer 3 configurations to each

subinterface.

• Bundle a group of physical interfaces and define a bundle master Layer 3 configuration or define

subinterfaces on the bundle master and give each subinterface Layer 3 configurations.

The command to create a subinterface over a cable interface is the same as that defined by Cisco IOS

for other software applications:

interface cable x/y.n

where x is the slot number, y is the port number, and n is the subinterface number.

Two new commands implement the bundling feature:

• [no] cable bundle number [master] — Configures cable interfaces into bundles.