Cisco UBR904 Troubleshooting Guide - Page 52

Debug Commands debug cable-modem bridge Use the debug cable-modem bridge command in privileged EXEC mode 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 Syntax Description This command has no keywords or arguments. Command Mode Privileged EXEC 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 (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. Examples 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 52 Cisco IOS Release 12.0(3)T