Need OID for rxload and input rate

[gurkamal01]

Hi all,

I want to monitor the rxload and input rate on interfaces but I can't find the correct OID can someone help me with this please.

Can someone also provideme a good document for this

GigabitEthernet4/8 is up, line protocol is up (connected)

  Hardware is Gigabit Ethernet Port, address is 000d.657d.3387 (bia 000d.657d.3387)

  Description: --- 2924_MAIN ---

  MTU 1500 bytes, BW 100000 Kbit, DLY 10 usec,

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

  Encapsulation ARPA, loopback not set

  Keepalive set (10 sec)

  Half-duplex, 100Mb/s, link type is auto, media type is 10/100/1000-TX

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

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

  Last input 00:00:47, output never, output hang never

  Last clearing of "show interface" counters 20w1d

  Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 0

  Queueing strategy: fifo

  Output queue: 0/40 (size/max)

  5 minute input rate 5000 bits/sec, 4 packets/sec

  5 minute output rate 153000 bits/sec, 26 packets/sec

     143271178 packets input, 34567505950 bytes, 0 no buffer

     Received 2731549 broadcasts (295416 multicast)

     0 runts, 0 giants, 0 throttles

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

     0 input packets with dribble condition detected

     253476590 packets output, 117220536494 bytes, 0 underruns

     1341644 output errors, 542074 collisions, 0 interface resets

     0 babbles, 259071 late collision, 0 deferred

     0 lost carrier, 0 no carrier

     0 output buffer failures, 0 output buffers swapped out

[gurkamal01]

Hi Experts

Can i get some help on this please

Thanks

[Derek Clothier]

Hi,

     There is no specific OID for the values you are after, but they can be calculated based on polling some OID's.

    To calculate the interface input traffic rate & rxload you would need to poll ifHCInOctets & ifHighSpeed at a regular interval and then perform the following calculation :

input bps = 8  * detaif ifHCInOctets / polling interval in seconds 

* where detaif ifHCInOctets is the difference between the current and previous value of  ifHCInOctets

rxload = 255 * input bps / (1000000 * ifHighSpeed )

* rxload is simply the input trafic rate expressed as a multiple of interface speed/255

NB ifHCInOctets is a 64 bit counter so you will need to poll it using snmp v2

     Hope this helps.

Regards

Derek Clothier

[Derek Clothier]

Correction.  Typing mistake.

detaif ifHCInOctets should be

deltaifHCInOctets ie change in ifHCInOctets

[gurkamal01]

Hi Derek,

Can you send me any cisco document link for this, it will help dig out some information from it.

I will really appreciate your help

Thanks

[Derek Clothier]

Hi,

     I haven't been able to find any documentation on CCo regarding this, but in my searching, I have come across the following MIb Object, which will tell you the input rate on the interface :

.1.3.6.1.4.1.9.2.2.1.1.6

locIfInBitsSec OBJECT-TYPE

    -- FROM     OLD-CISCO-INTERFACES-MIB

    SYNTAX          Integer

    MAX-ACCESS     read-only

    STATUS          Mandatory

    DESCRIPTION    "Five minute exponentially-decayed moving                            average of input bits per second."

     There is a similar object  locIfOutBitsSec (.1.3.6.1.4.1.9.2.2.1.1.8) for the output rate.

     To so rxload = 255 * locIfInBitsSec / (1000000 * ifHighSpeed )

Regards

Derek

[Henry Sali]

I found the below info when researching on Internet.

"SNMP Counters: Frequently Asked Questions" article explains the comparison between ifInOctets/ifOutOctets (32-bit counter) and ifHCInOctets/ifHCOutOctets (64-bit counter).

In summary, for interface with physical speed

<= 20 Mbps                 you must use 32-bit octet (byte) and packet counters

20 Mbps - 650 Mbps   you must use 64-bit octet counters and 32-bit packet counters

>= 650 Mbps               you must use 64-bit octet and packet counters HTH