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CiscouBR924 Software Configuration Guide
OL-0337-05 (8/2002)
Chapter1 Overview
CiscoIOS Software Release Feature Sets
To avoid potentially wasting bandwidth in this manner, the DOCSIS 1.0+ extensions support the
dynamic creation of multiple SIDs. New MAC messages dynamically add , delete, and modify SIDs
when needed. When a phone connected to the router is taken off-hook, the Cisco uBR924 router
creates a SID that has the QoS parameters needed for that particular voice call. When the call
terminates, the router deletes the SID, releasing its bandwidth for use elsewhere.
The DOCSIS 1.0+ features are introduced in CiscoIOS Software Release12.0(7)XR and 12.1(1)T.
Note Both the Cisco uBR924 cable access router and the CMTS router must support the dynamic multi-SID
and concatenation features for them to be used on the cable network. If you ar e using the Cisco uBR7200
series universal broadband router as the CMTS, Cisco IOS Release 12.0(7)X R, Release 12.1(1)T, or
later is required on both the Cisco uBR924 and Cisco uBR720 0 series routers to use these features.
Routing Information Protocol Version 2
When configured for routing mode, the Cisco uBR924 cable access router defau lts to using the Routing
Information Protocol Version 2 (RIPv2). In routing mode the Cisco uBR924 router automa tically
configures itself to use the headend’s IP address as its IP default gateway. This allows the
CiscouBR924 router to send packets not intended for the Ethernet interface to the headend.
RIPv2 routing is useful for small internetworks because it optimizes Network Interface Center
(NIC)-assigned IP addresses by defining Variable-Length Subnet Masks (VLSMs) for network
addresses, and it allows Classless Interdomain Routing (CIDR) addressing schema.
This feature is introduced in CiscoIOS Release 12.0(4)XI1.
Note The Cisco uBR924 cable access router supports only static route s and the RIPv2 routing protocol.
Secure Shell Version 1
The Cisco uBR924 router supports the Secure Shell (SSH) Version 1 protocol, which allows network
administrators to make a secure Telnet connection with the router. SSH provides for authentication and
encryption at the application layer, providing a secure connection even when BPI or IPsec authentication
and encryption are not used at the network layer.
By default, the SSH feature uses 56-bit DES encryption. Higher security 168-bit 3DES encryption is
available when using Cisco IOS images that support 3DES IPsec encryption. (The SSH server and client
must support the same level of encryption.)
SSH server support is introduced in Cisco IOS Release 12.1(1)T. SSH client support is introd uced in
Cisco IOS Release 12.1(3)T.
Note For configuration and other information, see the Secure Shell Version 1 Client feature module, available
on CCO and the Documentation CD-ROM.
Simple Gateway Control Protocol
The Simple Gateway Control Protocol (SGCP) provides for control call setup and teardown for VoIP
calls made through the Internet or a local Intranet. SGCP uses call control agents to communicate with
the voice gateways, allowing customers to create a distributed system that enhances performance,
reliability, and scalability while still appearing as a single VoIP gateway to external clients.