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debug cable-modem bridge
Troubleshooting Tips for the Cisco uBR904 Cable Modem 45
debug cable-modem bridge
Use the debug cable-modem bridge Privileged EXEC command to debug bridge filter processing
information on a cable modem. The no form of this command turns debugging messages off.
[no] debug cable-modem bridge
Usage Guidelines
This command first appeared in Cisco IOS Release 11.3 NA.
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
is completely up (the line protocol), 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.
Sample Display
Figure 5 shows sample display output for the debug cable-modem bridge Privileged EXEC
command
Figure 5 Sample Debug Cable-Modem Bridge Output
uBR904# debug cable-modem bridge
%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
Related Commands
debug cable-modem bpkm
debug cable-modem error
debug cable-modem interrupts
debug cable-modem mac
debug cable-modem map