C-10
Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide
OL-2239-03
Appendix C Viewing Sample Configuration Files
GRE Tunnel Example
In the example that follows, a Cisco uBR7200 series connects two branch office networks to their
respective head office using a GRE tunnel.
Note Each branch office network is connected to the Cisco uBR7200 series using the cable interface. Each
customer is assigned a separate subinterface over the physical cable interface.
The cable interface number 3 has been configured with two subinterfaces. Each subinterface connects to
a customer Small Office Home Office (SOHO) CM:
!
interface Cable3/0
no ip address
no ip directed broadcasr
no keepalive
ip route-cache policy
!(To configure policy based route-cache on subinterfaces. This command not available on
subinterfaces.)
cable downstream annex B
cable downstream modulation 64qam
cable downstream interleave-depth 32
cable upstream 0 power-level 0
no cable upstream 0 shutdown
!(While configuring the physical interface IP address and IP helper address parameters
must not be entered.)
interface c3/0.1
ip address 172.100.1.1 255.255.255.0
cable helper address 11.0.0.2
ip policy route-map customer1
no ip directed-broadcast
no cable proxy-arp
no cable ip-multicast-echo
interface c3/0.2
ip address 174.100.1.1 255.255.255.0
ip helper address 11.0.0.2
ip policy route-map customer2
no ip directed-broadcast
no cable proxy-arp
no cable ip-multicast-echo
interface serial 0
ip address 151.145.1.1 255.255.255.0
interface tunnel 0
ip address 172.100.3.1 255.255.255.252
tunnel source s0
tunnel destination 151.145.2.1
interface tunnel 1
ip address 174.100.3.1 255.255.252
tunnel source s0
tunnel destination 151.145.3.1
! configure route maps to forward traffic coming over c3/0.1 and c3/0.2 to go over the
tunnel 0 and
! tunnel 1 respectively.
route-map customer1 permit 10
match ip address 101
set ip next-hop 11.1.1.1
route-map customer1 permit 20
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