Processor board ID FAA0422Q04F
Bridging software.
1 Ethernet/IEEE 802.3 interface(s)
1 Cable Modem network interface(s)
3968K bytes of processor board System flash (Read/Write)
1536K bytes of processor board Boot flash (Read/Write)
Configuration register is 0x2102
The tunnel will show up/up, as long as the following conditions exist:
It is configured with valid IP addresses.•
There is a route in the routing table to the tunnel destination IP address, and not the IP address
assigned to the far end of the tunnel.
•
This should be true regardless of whether you can ping the destination address. An incorrect static route or a
default route pointing in the wrong direction will bring up the tunnel, however, the tunnel will not work.
The first step to verify that the tunnel works is to verify that the tunnel is up. Issue the show ip interface brief
and show interface tunnel 0 commands on both cable modems. Sample command output is shown below.
ubr924−ddd5#show ip interface brief
Interface IP−Address OK? Method Status Protocol
Ethernet0 9.9.9.9 YES manual up up
Tunnel0 192.168.20.1 YES manual up up
cable−modem0 10.1.4.5 YES unset up up
ubr924−ddd5#show interface tunnel 0
Tunnel0 is up, line protocol is up
Hardware is Tunnel
Internet address is 192.168.20.1/24
MTU 1514 bytes, BW 9 Kbit, DLY 500000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation TUNNEL, loopback not set
Keepalive set (10 sec)
Tunnel source 9.9.9.9 (Ethernet0), destination 11.11.11.11
Tunnel protocol/transport GRE/IP, key disabled, sequencing disabled
Checksumming of packets disabled
Last input 00:15:25, output 00:14:27, output hang never
Last clearing of "show interface" counters never
Queueing strategy: fifo
Output queue 0/0, 2 drops; input queue 0/75, 0 drops
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
146 packets input, 21024 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
172 packets output, 57392 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 output buffer failures, 0 output buffers swapped out
ubr924−b5db#show ip interface brief
Interface IP−Address OK? Method Status Protocol
Ethernet0 11.11.11.11 YES manual up up
Tunnel0 192.168.20.2 YES manual up up
cable−modem0 10.1.4.3 YES NVRAM up up
ubr924−b5db#show interface tunnel 0
Tunnel0 is up, line protocol is up
Hardware is Tunnel
Internet address is 192.168.20.2/24
MTU 1514 bytes, BW 9 Kbit, DLY 500000 usec,
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