Cisco SR2016T-NA Reference Manual page 1188

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
Syntax Description
This command has no arguments or keywords.
Command Modes Privileged EXEC
Command History Release
11.3(4)NA
12.0(4)XI1
12.0(5), 12.0(5)T
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
Cisco Broadband Cable Command Reference Guide
6-186
debug cable-modem bridge
no debug cable-modem bridge
Modification
This command was introduced for the Cisco uBR904 cable access router.
Support was added for the Cisco uBR924 cable access router.
This command was removed from normal access.
Chapter 6 Cable CPE Commands
OL-1581-07