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6 Release Notes for Cisco uBR904 Cable Access Router for Cisco IOS Release 11.3 NA

New and Changed Information

• IF-MIB

• CiscoWorks/CiscoView

Note Cisco Management Information Base (MIB) User Quick Reference is no longer published.

For the latest list of MIBs supported by Cisco, see Cisco Network Management Toolkit on CCO at:

Service & Support: Software Center: Network Mgmt Products: Cisco Network Management

Toolkit: Cisco MIB

Network Address Translation and Port Address Translation (NAT/PAT)

Network Address Translation (NAT):

• Allows customers to maintain their own private networks while giving them full Internet access

through the use of one or more global IP addresses.

• Allows several private IP addresses to use the same global IP address by using address

overloading.

• Facilitates conﬁguration and permits a large network of users to reach the network by using one

Cisco uBR904 cable access router and the same DOCSIS cable interface IP address.

• Eliminates the need to readdress all hosts with existing private network addresses (one-to-one

translation) or by enabling all internal hosts to share a single registered IP address (many-to-one

translation, also known as Port Address Translation [PAT]).

• Enables packets to be routed correctly to and from the outside world by using the Cisco uBR904

cable access router.

• Allows personal computers on the Ethernet interface to have IP addresses to be mapped to the

cable interface’s IP address.

Routing protocols will run on the Ethernet interface instead of the cable interface, and all packets

received are translated to the correct private network IP address and routed out the Ethernet

interface. This eliminates the need to run RIP on the cable interface.

To implement the Cisco uBR904 cable access router, the Ethernet interface is conﬁgured with an

“inside” address and the cable interface is conﬁgured with an “outside” address. The Cisco uBR904

cable access router also supports conﬁguration of static connections, dynamic connections, and

address pools.

Full and DOCSIS-Compliant Bridging

Full and DOCSIS-Compliant Bridging for the Cisco uBR904 cable access router complies with the

DOCSIS standards for interoperable cable modems.

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 (COS) attributes

• physical signal quality of the downstream channels

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