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Configuring Bridging
16
Cisco IOS Release 12.0(5)T
Configuring Bridging
The Cisco uBR924 cable access router is configured for DOCSIS-compliant transparent bridging by
default. If it becomes necessary to reconfigure the unit for bridging after it has been configured for
routing, you can erase the routing configuration and return the unit to factory default configuration
settings, or you can reconfigure the unit manually using the CLI. To return the cable access router to
factory default settings, see the section “Reestablishing DOCSIS-Compliant Bridging” on page 18
for details. To reconfigure the cable access router manually, perform the following tasks, starting in
global configuration mode:
Step Command Purpose
1
uBR924(config)#no service pad
Disable packet assembler/disassembler commands;
prevent the uBR924 from accepting incoming or outgoing
Packet Assembler/Disassembler (PAD) connections.
2
uBR924(config)#no service password-encryption
Disable password encryption.
3
uBR924(config)#no ip routing
Disable IP routing on the uBR924.
4
uBR924(config)#interface Ethernet0
Enter interface configuration mode for the Ethernet0
interface.
5
uBR924(config-if)#no ip address
Disable the IP address on the Ethernet0 interface.
6
uBR924(config-if)#no ip route-cache
Disable high-speed switching caches for IP routing.
7
uBR924(config-if)#bridge-group bridge-group
Assign the Ethernet0 interface to a bridge group. The
bridge group must be an integer between 1 and 63.
8 uBR924(config-if)#bridge-group bridge-group
spanning-disabled
Disable spanning tree on the Ethernet interface.
9
uBR924(config-if)#end
uBR924(config)#interface cable-modem0
Exit interface configuration mode for the Ethernet0
interface and enter interface configuration mode for the
cable access router interface.
10
uBR924(config-if)#no ip address
Disable the IP address of the coaxial cable interface, if
one has been set. The uBR7246 cable router assigns an IP
address to the cable access router each time it connects to
the network.
11
uBR924(config-if)#no ip route-cache
Disable high-speed switching caches for IP routing on the
cable interface.
12
uBR924(config-if)#no keepalive
Disable keepalives on the cable interface.
13
uBR924(config-if)#cable-modem compliant bridge
Enable DOCSIS-compliant bridging.
14
uBR924(config-if)#bridge-group bridge-group
Assign the cable access router interface to a bridge group.
The bridge group must be an integer from 1 to 63. (The
default is 59.)
15
uBR924(config-if)#bridge-group bridge-group
spanning-disabled
Disable spanning tree on the cable interface.
16
uBR924(config-if)#end
uBR924(config)#ip classless
Exit interface configuration mode.
(Optional) At times, the uBR924 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.
17
uBR924(config)#line console 0
Enter line configuration mode to configure the console
port.