QOS with a BW or internet access shared between routers?

[adelbano]

Hello all.

I have a router in my internet access but this share the connection with other routers.

My question about BW is that if I want to configure QOS and shaping,,, what BW I need to use?

I don't understand where can I found BW used in a interface.

Thanks for your help gurus!!!

[acampbell · Accepted solution]

Hi,

On any interface you will see the usage over the last 5 minutes by default

Example on my switch (Routers are the same)

show int fas 1/0/48

!

FastEthernet1/0/48 is up, line protocol is up (connected)

  Hardware is Fast Ethernet, address is 0017.9562.6534 (bia 0017.9562.6534)

  MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,

     reliability 255/255, txload 1/255, rxload 1/255

  Encapsulation ARPA, loopback not set

  Keepalive set (10 sec)

  Full-duplex, 100Mb/s, media type is 10/100BaseTX

  input flow-control is off, output flow-control is unsupported

  ARP type: ARPA, ARP Timeout 04:00:00

  Last input 00:00:00, output 00:00:00, output hang never

  Last clearing of "show interface" counters never

  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 4000 bits/sec, 6 packets/sec

  5 minute output rate 3000 bits/sec, 4 packets/sec

     58554591 packets input, 5635281796 bytes, 0 no buffer

     Received 40480113 broadcasts (39305055 multicasts)

     0 runts, 0 giants, 0 throttles

     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored

     0 watchdog, 39305062 multicast, 0 pause input

     0 input packets with dribble condition detected

HTH

Alex

[adelbano]

And this is the current interface BW? With this number can I calculate the average of the interface BW?

4kbps is the current BW?

[acampbell · Accepted solution]

Hi,

This will show the input/output usage for the last 5 mins

You can tweek this down to the last 30 seconds

conf t

!

int fas 1/0/48

load-interval 30

!

show int fas 1/0/48

!

FastEthernet1/0/48 is up, line protocol is up (connected)

  Hardware is Fast Ethernet, address is 0017.9562.6534 (bia 0017.9562.6534)

  MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,

     reliability 255/255, txload 1/255, rxload 1/255

  Encapsulation ARPA, loopback not set

  Keepalive set (10 sec)

  Full-duplex, 100Mb/s, media type is 10/100BaseTX

  input flow-control is off, output flow-control is unsupported

  ARP type: ARPA, ARP Timeout 04:00:00

  Last input 00:00:00, output 00:00:00, output hang never

  Last clearing of "show interface" counters never

  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0

  Queueing strategy: fifo

  Output queue: 0/40 (size/max)

  30 second input rate 4000 bits/sec, 6 packets/sec

  30 second output rate 2000 bits/sec, 4 packets/sec

     58572904 packets input, 5636786364 bytes, 0 no buffer

     Received 40493710 broadcasts (39318211 multicasts)

     0 runts, 0 giants, 0 throttles ........

HTH

Alex

[adelbano]

Thank you for your answer.

And if it's a fasthernet link and the output tell there are 5Mbps, the link is 5/100=1/20=5% of the link used?

Tell me this last issue and I will understand all!!!

Thank you!

Albert.

[acampbell · Accepted solution]

Albert,

You are welcome

Yes you are correct with your figures

You can also look at the loading figures on the interface but

you need to use your maths

FastEthernet1/0/48 is up, line protocol is up (connected)

  Hardware is Fast Ethernet, address is 0017.9562.6534 (bia 0017.9562.6534)

   MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,

     reliability 255/255, txload 206/255, rxload 67/255

  Encapsulation ARPA, loopback not set

  Keepalive set (10 sec).......................

So TX load is 206/255 = 206 X 100/255 = 80. 78 %

     RX load is 67/255 = 67 x 100/255 =  26.27 %

Regards

Alex