Installation guide

4-10
Cisco uBR7100 Series Universal Broadband Router Software Configuration Guide
OL-2238-03
Chapter 4 Configuring Basic Broadband Internet Access
Integrated Routing and Bridging Configuration
bridge-group 1
bridge-group 1 spanning-disabled
!
interface Cable1/0
ip address 10.1.1.1 255.255.255.0
no ip route-cache
no ip mroute-cache
load-interval 30
no keepalive
cable downstream annex B
cable downstream modulation 256qam
cable downstream interleave-depth 32
cable downstream frequency 525000000
no cable downstream rf-shutdown
cable upstream 0 frequency 17808000
cable upstream 0 power-level 0
cable upstream 0 timing-adjust threshold 0
cable upstream 0 timing-adjust continue 0
cable upstream 0 channel-width 3200000
no cable upstream 0 shutdown
bridge-group 1
bridge-group 1 subscriber-loop-control
bridge-group 1 spanning-disabled
!
ip default-gateway 1.10.0.3
ip classless
no ip http server
!
no cdp run
tftp-server bootflash:platinum.cm alias platinum.cm
tftp-server bootflash:gold.cm alias gold.cm
tftp-server bootflash:silver.cm alias silver.cm
tftp-server bootflash:disable.cm alias disable.cm
!
line con 0
exec-timeout 0 0
privilege level 15
length 0
transport input none
line aux 0
line vty 0 4
privilege level 15
no login
!
end
Integrated Routing and Bridging Configuration
Integrated Routing and Bridging (IRB) operation allows bridging within a specific segment of networks
or hosts, yet also allows those hosts to connect to devices on other, routed networks, without having to
use a separate router to interconnect the two networks. IRB operation is typically not used in DOCSIS
CMTS installations because of potential performance and security problems, but bridging operations is
appropriate for certain MDU/MTU applications. For example, a hotel could offer Internet connectivity
for customers who want to use a fixed IP address, as opposed to being assigned a temporary IP address
from the local server’s DHCP address pool.