WAN : POS interface information

[lrichet31]

Hi,

I have cisco routers on a WAN link (SDH). When i run the command "show interface POS X/X/X", what is the rate which appears ?

Example :  show interfaces pos 2/0/0

POS2/0/0 is up, line protocol is up

  Hardware is cyBus Packet over Sonet

  Description: PRI-T1 net to zippy (4K) to Pac-Bell

  Internet address is 1.1.1.1/27

  MTU 4470 bytes, BW 1000 Kbit, DLY 40000 usec, rely 255/255, load 1/255

  Encapsulation HDLC, loopback not set, keepalive set (3 sec)

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

  Last clearing of "show interface" counters 00:23:09

  Queueing strategy: fifo

  Output queue 0/40, 0 drops; input queue 0/75, 0 drops

  5 minute input rate 0 bits/sec, 1 packets/sec

  5 minute output rate 1000 bits/sec, 1 packets/sec

     1046 packets input, 54437 bytes, 0 no buffer

     Received 485 broadcasts, 0 runts, 0 giants, 0 parity

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

     4013 packets output, 1357412 bytes, 0 underruns

     0 output errors, 0 applique, 0 interface resets

     0 output buffer failures, 0 output buffers swapped out

     0 carrier transitions

The 2 lines input & output rate, Cisco says "Average number of bits and packets received or transmitted per second in the last 5 minutes."

But i want to know if it's a layer 3 rate or a layer 2 rate ? I know that's the SDH packets are not counted but i want to know if HDLC&PPP packets are counted ?

[meperuma]

Hi

Looks to me it include both l2 and l3 as it counts for packets in and out of the interface,

I am not sure about your requirement but if your platform support, you can apply a MQC/policy-map on in and out with a class of l3 and l2, you should able to see the rate or packet counts

HTH

Sent from Cisco Technical Support iPhone App

[lrichet31]

Hi,

Thanks for your reply.

I have no specially requirements. I made bandwith test with a 10Gb generators (on the lan side) with different packet size to test the capacity of the equipments

So with 64 octets packets (ethernet) and a 2,5 Gb SDH link, the generator said that the maximum rate is 800 Mb/s before dropping. (LAN Ethernet side)

And on my router, on the interface POS, i had a 1,2 Gb/s rate.

There is the protocol overhead mecanism (IPSec, PPP/HDLC, SDH...). For this kind of packet, there are more overhead than payload.

So i just want to understand the value of the rate of the pos interface and which data are take in consideration...