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Chapter 32: Packet Throttling

STANDARD Revision 1.0 C4® CMTS Release 8.3 User Guide

 Router Solicitation packets

 Router Redirect packets

 Router Advertisement packets

For purposes of throttling, any IPv6 UDP packet with a DEST Port of 547, and any IPV4 packet with a DEST Port of 67 are

considered DHCP packets.

Note: This feature is also called subscriber-side throttling, DHCP/ARP, or IGMP throttling.

IPv6 Neighborhood Discovery

IPv6 ND is a set of protocol messages (RFC 2461) and processes that determine relationships between neighboring nodes.

There are five types of ND packets that are throttled by this feature:

 Router Solicitation (RS — type 133)

 Router Advertisement (RA — type 134)

 ND neighbor solicitation (type 135)

 ND neighbor advertisement (type 136)

 Redirect (type 137)

Note: Type is an option that is formatted in the Type-Length-Variable (TLV) format.

ARP/ND Monitoring

ARP/ND Abuse Count Monitoring provides a means of controlling CMs or CPEs that are generating excessive:

 ARP packets

 ND packets

Note: DHCP/ARP Throttling must be enabled for ARP/ND Abuse Counts to function.

Even though this feature throttles all devices, the system monitors only the first 32 devices (specifically MAC addresses)

subject to ARP/ND request throttling on a CAM plus the first 32 devices subject to ARP/ND reply throttling on an interface.

It then counts the number of ARP/ND request or reply packets dropped due to throttling of those devices.

Arris C4C User Manual

Questions and Answers: