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Chapter 2
Cisco CMTS Configuration Commands
cable monitor
To enable the forwarding of selected packets on the cable interface to an external LAN analyzer, use the
cable monitor command in cable interface configuration mode. To disable this function, use the no form
of this command.
Syntax Description
incoming
outbound
timestamp
interface interface
access-list name| number Specifies the IP access list name or number (1 to 2699).
mac-address address
sid sid-number
packet-type
data docsis
data ethernet
mac [type type]
OL-1581-08
cable monitor [incoming | outbound] [timestamp]
interface interface {access-list {name | number} | mac-address address | sid sid-number}
[packet-type {data docsis | data ethernet | mac [type type] } ]
no cable monitor
Forwards only packets being received on the upstream.
Forwards only packets being transmitted on the downstream.
Enables packet time-stamping by appending a four-byte value to the
forwarded packets. The timestamp value is in hundredths of a second.
Specifies the WAN interface to which an external LAN analyzer is
attached, and to which packets should be forwarded. You can forward
packets only to an Ethernet, Fast Ethernet, or Gigabit Ethernet interface.
Specifies the MAC address of the device being monitored.
Specifies the service ID for the packets that should be forwarded
(1 to 16384).
Note
(Optional) Specifies whether data or MAC packets are forwarded.
Specifies that complete DOCSIS packets (both the DOCSIS header and the
complete Ethernet frame) should be forwarded.
Note
Specifies that the DOCSIS header should be stripped from the packet and
that only the Ethernet frame should be forwarded.
Specifies that only DOCSIS MAC-layer packets should be forwarded. If
you are using the sid option, you can also optionally specify the type
option with one of the following keywords to indicate that only the specific
type of MAC-layer traffic should be forwarded:
This option is supported only in Cisco IOS releases that support
DOCSIS 1.1 operations.
Enabling this option can result in %LINK-4-TOOBIG messages
being generated if the original Ethernet frame is at or near the
maximum Ethernet size of 1500 bytes. This is because this option
adds additional bytes (the DOCSIS header) to the Ethernet frame,
which can result in a total frame size that exceeds the maximum
size that is allowed for standard Ethernet frames.
dsa—Dynamic service addition
dsc—Dynamic service change
dsd—Dynamic service deletion
map-grant—Grants
map-req—Requests
Cisco Broadband Cable Command Reference Guide
cable monitor
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