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Configuring Subscriber-End Broadband Access Router Features
Configuring Bridging
MC-646
Cisco IOS Multiservice Applications Configuration Guide
When the cable interface comes up, the IP address and downstream channel are configured
automatically.
Note To configure multiple PCs, repeat Steps 4 through 7 above for each additional PC. You can
connect a maximum of three PCs to the Cisco uBR900 series cable access router in a
bridging application.
Step 7
uBR924(config-if)# bridge-group bridge-group
Assigns the Ethernet0 interface to a bridge group.
The bridge group must be an integer from 1 to 63.
Step 8
uBR924(config-if)# bridge-group bridge-group
spanning-disabled
Disables spanning tree on the Ethernet interface.
Step 9
uBR924(config-if)# end
uBR924(config)# interface cable-modem0
Exits interface configuration mode for the Ethernet0
interface and enters interface configuration mode for
the cable access router interface.
Step 10
uBR924(config-if)# no ip address
Disables the IP address of the coaxial cable interface,
if one has been set. The Cisco uBR7200 series cable
router assigns an IP address to the cable access router
each time it connects to the network.
Step 11
uBR924(config-if)# no ip route-cache
Disables high-speed switching caches for IP routing
on the cable interface.
Step 12
uBR924(config-if)# no keepalive
Disables keepalives on the cable interface.
Step 13
uBR924(config-if)# cable-modem compliant bridge
Enables DOCSIS-compliant bridging.
Step 14
uBR924(config-if)# bridge-group bridge-group
Assigns the cable access router interface to a bridge
group. The bridge group must be an integer from 1 to
63. (The default is 59.)
Step 15
uBR924(config-if)# bridge-group bridge-group
spanning-disabled
Disables spanning tree on the cable interface.
Step 16
uBR924(config-if)# end
uBR924(config)# ip classless
Exits interface configuration mode.
(Optional) At times, the Cisco uBR900 series might
receive packets destined for a subnet of a network that
has no network default route. This global
configuration mode command allows the Cisco IOS
software to forward such packets to the best network
route possible.
Step 17
uBR924(config)# line console 0
Enters line configuration mode to configure the
console port.
Step 18
uBR924(config-line)# line vty 0 4
Identifies the last line in a contiguous group of virtual
terminals you want to configure.
Step 19
uBR924(config-line)# Ctrl-z
uBR924# copy running-config startup-config Building
configuration...
Returns to privileged EXEC mode.
Saves the configuration to NVRAM so that it will not
be lost in the event of a reset, power cycle, or power
outage.
Command Purpose