Chapter 2: C4/C4c CMTS Features
STANDARD Revision 1.0
C4® CMTS Release 8.3 User Guide
© 2016 ARRIS Enterprises LLC. All Rights Reserved.
57
Secure NTP — A mechanism is provided for authentication of NTP messages. For MSOs who require NTPv4 functionality,
including server or peer authorization, the C4 CMTS will only support the NTPv4 symmetric key MD5 secure hash
authentication method.
DHCP Text Injection — DHCP Text Injection will allow the operator to distinguish which upstream channels DHCP packets
originated from as they are forwarded to the DHCP server. The upstream will be identified in the circuit ID sub-option of
the DHCP relay agent option (option 82).
Named Access List — By allowing the use of a description name to identify an access list rather than a number, full
modification to an existing access-list (e.g., delete, append and insert new entries) by using the ACL name is now available.
Also, we are adding the ability to allow multiple remarks per access-list entry.
Additional Modem States — One additional cable modem state indicating the status of the Network Access Control for a
registered CM has been added. The CM’s Network Access Control state is provided via the modem configuration file. This
variable indicates whether or not CPE devices are allowed to access the network through the CM even though the CM is
registered.
Integrated Upstream Agility — This provides the ability to enable or disable an Upstream Agility state machine for an
upstream channel. The state machine includes permissible upstream channel frequencies and operating characteristics
(e.g., channel width, modulation profile) along with rules to change from one operating characteristic to another.
Clear Cable Host/Modem — Enabled the ability to remove cable modems and CPEs from the system including removing
them from the MACDB and C4 CMTS MIB tables.
ARP Throttling — Provides the ability to control the number of ARPS and ICMP packets that are generated due to traffic
transmitted to IP addresses that do not have a valid (active or inactive) entry in the ARP cache.
Configure Cable Modem Vendor OUI — This feature provides the ability to configure a cable modem vendor name with
the vendor’s Organizational Unique Identifier (OUI). The OUI is the first three bytes of the six byte CM MAC address.
Show Cable Modem Column — This new command will now allow you to create your own output by specifying exactly
which columns you wish to see, thus maximizing your screen space and run-time.
Release 5.1.x Features
The following is a list of the new features included in Software Release 5.1.x: