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8 Release Notes for Cisco uBR924 Cable Access Router for Cisco IOS Release 12.0 XI

Limitations and Restrictions

Radio Frequency Interface MIB

The Radio Frequency Interface (RFI) MIB module is for DOCSIS-compliant radio frequency

interfaces in cable access routers and cable access router termination systems. On the cable access

router, RFI MIB entries provide:

• upstream and downstream channel characteristics

• class of service attributes

• physical signal quality of the downstream channels

• attributes of cable access router MAC interface

• status of several MAC layer counters

The RFI MIB includes tables describing both the cable access router termination system and the

cable access router side of the cable interface. All cable access router tables are implemented.

Routing (RIP V2)

A routing conﬁguration for the Cisco uBR924 cable access router is most likely used when the cable

access router is being added to an existing personal computer network or when the cable access

router is being conﬁgured for ﬁve or more personal computers. The Cisco uBR924 cable access

router will automatically conﬁgure the headend’s IP address as its IP default gateway. When the IP

host-routing is being conﬁgured, this automatic conﬁguration of the headend’s IP address as its IP

default gateway will allow the Cisco uBR924 cable access router to send packets not intended for

the Ethernet interface to the headend.

RIP V2 routing is useful for small internetworks in that it enables optimization of NIC-assigned IP

addresses by deﬁning VLSMs for network addresses, and it allows CIDR addressing schema.

Limitations and Restrictions

This section describes warnings and cautions about using Cisco IOS Release 12.0(4)XI software.

Important Notes

This section contains important information about use of your Cisco IOS Release 12.0(4) XI

software.

Bridging Mode

When conﬁgured to support voice in a bridging mode, the uBR924 cable access router must be

communicating with a routing headend. This is corrected in Cisco IOS Release 12.0(5)T or higher.

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