
2-175
Cisco Broadband Cable Command Reference Guide
OL-1581-08
Chapter 2 Cisco CMTS Configuration Commands
cable monitor
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.
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
Syntax Description
incoming
Forwards only packets being received on the upstream.
outbound
Forwards only packets being transmitted on the downstream.
timestamp
Enables packet time-stamping by appending a four-byte value to the
forwarded packets. The timestamp value is in hundredths of a second.
interface
interface
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.
access-list
name
|
number
Specifies the IP access list name or number (1 to 2699).
mac-address
address
Specifies the MAC address of the device being monitored.
sid
sid-number
Specifies the service ID for the packets that should be forwarded
(1 to 16384).
Note
This option is supported only in Cisco IOS releases that support
DOCSIS 1.1 operations.
packet-type
(Optional) Specifies whether data or MAC packets are forwarded.
data docsis
Specifies that complete DOCSIS packets (both the DOCSIS header and the
complete Ethernet frame) should be forwarded.
Note
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.
data ethernet
Specifies that the DOCSIS header should be stripped from the packet and
that only the Ethernet frame should be forwarded.
mac
[
type
type
]
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:
dsa
—Dynamic service addition
dsc
—Dynamic service change
dsd
—Dynamic service deletion
map-grant
—Grants
map-req
—Requests
Содержание Broadband Cable
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Страница 1266: ...A 50 Cisco Broadband Cable Command Reference Guide OL 1581 07 Appendix A Using the ROM Monitor unset ...