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Cisco Broadband Cable Command Reference Guide
OL-1581-07
Chapter 6 Cable CPE Commands
debug cable-modem bridge
debug cable-modem bridge
To display bridge filter processing information, use the
debug cable-modem bridge
command in
Privileged EXEC mode. To disable bridge filter debugging, use the
no
form of this command.
Cisco uBR904, uBR905, uBR924, uBR925 cable access routers, Cisco CVA122 Cable Voice Adapter
debug cable-modem bridge
no debug cable-modem bridge
Syntax Description
This command has no arguments or keywords.
Command Modes
Privileged EXEC
Command History
Usage Guidelines
When the interface is down, all bridge table entries learned on the Ethernet interface are set to discard
because traffic is not bridged until the cable interface has completed initialization. After the interface
(the line protocol) is completely up, bridge table entries learned on the Ethernet interface program the
cable’s MAC data filters. The cable MAC hardware filters out any received packets whose addresses are
not in the filters. In this way, the cable interface only receives packets addressed to its own MAC address
or an address it has learned on the Ethernet interface.
In Cisco IOS Release 12.0(5) and later releases, this command is available only under the direction of
TAC or field service, and should be used only while debugging CM operation. Displaying debugging
messages consumes system resources, and turning on too many messages could negatively affect system
performance.
Examples
The following shows typical output for the
debug cable-modem bridge
command:
Router#
debug cable-modem bridge
Router#
%LINEPROTO-5-UPDOWN: Line protocol on Interface cable-modem0, changed state to downshut
cm_tbridge_add_entry(): MAC not initialized, discarding entry: 00e0.fe7a.186fno shut
cm_tbridge_add_entry(): MAC not initialized, discarding entry: 00e0.fe7a.186f
%LINEPROTO-5-UPDOWN: Line protocol on Interface cable-modem0, changed state to up
cm_tbridge_add_entry(): Adding entry 00e0.fe7a.186f to filter 2
Release
Modification
11.3(4)NA
This command was introduced for the Cisco uBR904 cable access router.
12.0(4)XI1
Support was added for the Cisco uBR924 cable access router.
12.0(5), 12.0(5)T
This command was removed from normal access.
