You can look at the stats of the outside interface. If you had a serial interface then you would look at serial0/0 or whatever the interface is. For example, I've got ADSL with an ATM WIC, so I bring up the stats for int virtual-access 1 ..
collossus#sh int dialer0
Dialer0 is up, line protocol is up (spoofing)
Hardware is Unknown
Internet address is 213.249.x.y/32
MTU 1500 bytes, BW 1024 Kbit, DLY 20000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation PPP, loopback not set
DTR is pulsed for 1 seconds on reset
Interface is bound to Vi1
Last input never, output never, output hang never
Last clearing of "show interface" counters 2w4d
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: weighted fair
Output queue: 0/1000/64/0 (size/max total/threshold/drops)
Conversations 0/0/256 (active/max active/max total)
Reserved Conversations 0/0 (allocated/max allocated)
Available Bandwidth 768 kilobits/sec
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
670399 packets input, 544344358 bytes
542823 packets output, 56191704 bytes
Bound to:
Virtual-Access1 is up, line protocol is up
Hardware is Virtual Access interface
MTU 1500 bytes, BW 1024 Kbit, DLY 100000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation PPP, loopback not set
DTR is pulsed for 5 seconds on reset
Interface is bound to Di0 (Encapsulation PPP)
LCP Open
Listen: CDPCP
Open: IPCP
Bound to ATM0 VCD: 1, VPI: 1, VCI: 50
Cloned from Dialer0
Last input 00:00:42, output never, output hang never
Last clearing of "show interface" counters 2w4d
Input queue: 1/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue :0/40 (size/max)
5 minute input rate 605000 bits/sec, 57 packets/sec
5 minute output rate 13000 bits/sec, 39 packets/sec
737217 packets input, 547003438 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
596800 packets output, 57143319 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 output buffer failures, 0 output buffers swapped out
0 carrier transitions
collossus#
The bit that you need to look at is the 5 min input/output rates. These show that actual bandwidth utilisation of the router. In this case, I have a 1MB line but while I was downloading some film trailors I managed to get 605K/sec through my router.
If you start doing a large download or file transfer, keep looking at your interface stats and you'll see these figures creep up.
Chris.
************************
Chris Andrew, CCNA
chrisac@gmx.co.uk
************************