Interface Interpretation

Hello Community,

Can someone please explain why the BW on Dialer1 is 56 Kbit/Sec, while the Virtual-Access2 (that the Dialer 1 is bound to) has a BW of 448 kbit/s?


uk01340-rm01-ald#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
uk01340-rm01-ald(config)#end
uk01340-rm01-ald#show int dial 1
Dialer1 is up, line protocol is up (spoofing)
  Hardware is Unknown
  Internet address is 80.229.xxx.xx/30
  MTU 1500 bytes, BW 56 Kbit/sec, DLY 20000 usec,
     reliability 255/255, txload 255/255, rxload 255/255
  Encapsulation PPP, LCP Closed, loopback not set
  Keepalive set (10 sec)
  DTR is pulsed for 1 seconds on reset
  Interface is bound to Vi2
  Last input never, output never, output hang never
  Last clearing of "show interface" counters 2d23h
  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  0/0/16 (active/max active/max total)
     Reserved Conversations 0/0 (allocated/max allocated)
     Available Bandwidth 42 kilobits/sec
  5 minute input rate 672000 bits/sec, 91 packets/sec
  5 minute output rate 358000 bits/sec, 62 packets/sec
     11406560 packets input, 1877304168 bytes
     9925735 packets output, 18446744072806663030 bytes
Bound to:
Virtual-Access2 is up, line protocol is up
  Hardware is Virtual Access interface
  MTU 1500 bytes, BW 448 Kbit/sec, DLY 20000 usec,
     reliability 255/255, txload 216/255, rxload 255/255
  Encapsulation PPP, LCP Open
  Open: IPCP
  PPPoATM vaccess, cloned from Dialer1
  Vaccess status 0x44
  Bound to ATM0/1/0 VCD: 1, VPI: 0, VCI: 38, loopback not set
  Keepalive set (10 sec)
  DTR is pulsed for 5 seconds on reset
  Interface is bound to Di1 (Encapsulation PPP)
  Last input 00:00:00, output never, output hang never
  Last clearing of "show interface" counters 2d23h
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 672000 bits/sec, 92 packets/sec
  5 minute output rate 380000 bits/sec, 89 packets/sec
     11429126 packets input, 1875972366 bytes, 0 no buffer
     Received 0 broadcasts (0 IP multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
     9925741 packets output, 3392079954 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 unknown protocol drops
     0 output buffer failures, 0 output buffers swapped out
     0 carrier transitions

And if I were to monitor the interface, should I monitor the Dialer 1 interface or the Virtual-Access 2 interface?

Cheers

Carlton
cpatte7372Asked:
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Fred MarshallPrincipalCommented:
I don't really know much about that gear.  What occurs to me is this:
"bandwidth" is a capability or a resource.  You can "have" it (available) without using it.
"signaling rate" is a setting.  e.g. a serial port communication often requires that it be set to something like 9600, 115000, etc.

So if two ports are communicating with one another and one has a BW of 56kbps and the other 448kbps then the lower number will limit what can happen because that's all that's available to the combined link.  Then, the actual achieved rate might be something less than that.  e.g. 48kbps or 45.37 kpbs if you measure that precisely.
But, in this case you would NOT get 57 kbps.
If that's descriptive of what you have then perhaps this will help.

And, this is the simple case without special buffering and burst transmissions.  But the physics still holds.
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cpatte7372Author Commented:
fmarshall,

That makes logical sense. Thanks for responding.
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cpatte7372Author Commented:
Cheers
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