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Switch 3750 - Interface VLAN counters

 
 
H.A.M
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Posts: n/a
 
      10-02-2007
Hello all,

I use MRTG to poll (SNMP) my cisco switches and to graph in/out
bandwidth for some specific ports.

I would like to poll a 3750 switch to get in/out bandwidth for some
VLAN interfaces. I already do that on 4507 switch and there is no
problem. But with my 3750, interface vlan counters seems to be
wrong... !?!.

I explain :

My 3750 is a WS-C3750G-12S (12.2(35)SE1), so with 12 mini-gbic
interfaces. All the interfaces are in trunk mode.

Example :

-> Interface g1/0/1 accepts vlans 3 and 4
-> Interface g1/0/2 accepts vlans 3 and 5
-> interface g1/0/3 accepts vlans 3 and 6
-> interface g1/0/4 accepts vlans 100 -> outgoing vlan / default
route.
-> ...

I 'd like to get in/out statistics for traffic from/to Vlan 3 routed
from/to other vlans.

But in/out counters of interface vlan 3 don't seems to be with the
right value : I don't go over 1 or 2 packets/s :

----------------------------
Vlan3 is up, line protocol is up
Hardware is EtherSVI, address is 001a.a20b.454e (bia 001a.a20b.454e)
Internet address is 10.3.1.2/16
MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:01, output 00:00:00, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/121/0 (size/max/drops/flushes); Total output
drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 6000 bits/sec, 1 packets/sec
5 minute output rate 1000 bits/sec, 1 packets/sec
6362193 packets input, 2219645443 bytes, 0 no buffer
Received 0 broadcasts (1868101 IP multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
1696302 packets output, 395717492 bytes, 0 underruns
0 output errors, 0 interface resets
0 output buffer failures, 0 output buffers swapped out
----------------------------------

If I do 'sh interface' on the other physical interfaces, I have a lot
of trafic and I'm sure that Vlan 3 traffic is aimed to be routed to
Vlan 100 (--> internet). And I have the same problem with the
interface vlan 100.

So what's wrong.... is there a specific command on the interface to
get these statistics ?

Thanks in advance for your help.

 
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stephen
Guest
Posts: n/a
 
      10-06-2007
"H.A.M" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed) ups.com...
> Hello all,
>
> I use MRTG to poll (SNMP) my cisco switches and to graph in/out
> bandwidth for some specific ports.
>
> I would like to poll a 3750 switch to get in/out bandwidth for some
> VLAN interfaces. I already do that on 4507 switch and there is no
> problem. But with my 3750, interface vlan counters seems to be
> wrong... !?!.
>
> I explain :
>
> My 3750 is a WS-C3750G-12S (12.2(35)SE1), so with 12 mini-gbic
> interfaces. All the interfaces are in trunk mode.
>
> Example :
>
> -> Interface g1/0/1 accepts vlans 3 and 4
> -> Interface g1/0/2 accepts vlans 3 and 5
> -> interface g1/0/3 accepts vlans 3 and 6
> -> interface g1/0/4 accepts vlans 100 -> outgoing vlan / default
> route.
> -> ...
>
> I 'd like to get in/out statistics for traffic from/to Vlan 3 routed
> from/to other vlans.


i dont think the 3750 / 3560s support vlan rate stats (or more accurately,
stats for L3 interfaces to a VLAN).

however "show int vlan xxx" does show traffic on a 3560 here - v12.2(40)SE,
so there is something being collected you should be able to get at.
>
> But in/out counters of interface vlan 3 don't seems to be with the
> right value : I don't go over 1 or 2 packets/s :
>
> ----------------------------
> Vlan3 is up, line protocol is up
> Hardware is EtherSVI, address is 001a.a20b.454e (bia 001a.a20b.454e)
> Internet address is 10.3.1.2/16
> MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
> reliability 255/255, txload 1/255, rxload 1/255
> Encapsulation ARPA, loopback not set
> ARP type: ARPA, ARP Timeout 04:00:00
> Last input 00:00:01, output 00:00:00, output hang never
> Last clearing of "show interface" counters never
> Input queue: 0/75/121/0 (size/max/drops/flushes); Total output
> drops: 0
> Queueing strategy: fifo
> Output queue: 0/40 (size/max)
> 5 minute input rate 6000 bits/sec, 1 packets/sec
> 5 minute output rate 1000 bits/sec, 1 packets/sec
> 6362193 packets input, 2219645443 bytes, 0 no buffer


most SNMP collectors poll the total input / output stats and calc rates
themsleves...... so try doing it that way.

> Received 0 broadcasts (1868101 IP multicasts)
> 0 runts, 0 giants, 0 throttles
> 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
> 1696302 packets output, 395717492 bytes, 0 underruns
> 0 output errors, 0 interface resets
> 0 output buffer failures, 0 output buffers swapped out
> ----------------------------------
>
> If I do 'sh interface' on the other physical interfaces, I have a lot
> of trafic and I'm sure that Vlan 3 traffic is aimed to be routed to
> Vlan 100 (--> internet). And I have the same problem with the
> interface vlan 100.
>
> So what's wrong.... is there a specific command on the interface to
> get these statistics ?
>
> Thanks in advance for your help.

--
Regards

http://www.velocityreviews.com/forums/(E-Mail Removed) - replace xyz with ntl


 
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