Cisco Broadband Cable Command Reference Guide

Chapter 2 Cisco Cable Modem Termination System Commands
OL-1581-05
show interface cable modem
The following is sample output from the show interface cable modem command for an individual SID
on a particular cable interface.
Router# show interface cable 6/0 modem 9
SID Priv bits Type State IP address method MAC address
9 11 modem online(pt) 1.2.3.21 dhcp 0010.7bed.a52f
Router#
Table 2-37 show interface cable modem Field Descriptions
Field Description
SID Identifies a SID currently defined and in use on this particular cable
interface.
Priv bits Identifies the current settings of the two privacy bits in the
Extended Header (EH) that is used for BPI-encrypted packets.
First bit = Enable bit. Set to 1 when BPI or BPI+ is enabled.
Second bit = Toggle bit. Matches the least significant bit (LSB)
of the Key Sequence Number (KSN) in the EH.
For example, a value of “00” indicates that BPI is not enabled. A
value of “10” indicates that BPI is enabled and that the KSN is an
even number. A value of “11” indicates that BPI is enabled and that
the KSN is an odd number.
Note For more information on these bits, see the DOCSIS
Baseline Privacy Interface Plus Interface Specification
(SP-BPI+-I08-020301 or later).
Type Identifies the use for this SID:
host = SID is used for a CPE device.
modem = SID is used for a CM.
multicast = SID is used for a multicast broadcast.
State The current state of the MAC layer for this SID and CM (see
Table 2-22 on page 2-370). For hosts or multicast broadcasts, the
state will always be unknown.
IP address Identifies the IP address for the CM using this SID.
method Identifies the way that the IP address was assigned:
dhcp = IP address was dynamically assigned by a DHCP
server.
pppoe = IP addressing is handled by the PPPoE protocol.
static = IP address is a static IP address that is assigned to this
particular MAC address (CPE devices only).
MAC address Identifies the hardware (MAC) address for the CM using this SID.
Note The show interface cable modem command shows similar information to the show cable modem
command, but adds information about the privacy bits and IP addressing method.
Cisco Broadband Cable Command Reference Guide
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