Hi all,
This router uses a ppp link configured to use 2000Mbps.
Our netcool showed that sometimes the utilization of the link was over the 170%, so, many questions were generated:
1. How was possible that NO DISCARD nor CRC errors where in the interface if it was working at 170%.
2. How was possible that if the provider give us 2000Mbps, our interface were working at near 4000Mbps?
First we thought it could be related with a Netcool problem, and for any reason the statics were not accurate (maybe a bandwith missconfiguration or something like that). We decided to run an script to ask our device every 15 seconds for the load of the interface (not trusting in the load parameter as it is not truely representative but trusting on the '5 minutes input bits/second')
We show that actually the router was working with that link moving more data than the avalilable by the provider.
The interface is using compresion, but I think that the mesure of bits per second at the show interfaces is done with the traffic that actualy is placed over the link (once compressed).
Below is one end configuration and a Show interface:
!
interface Serial0/0
description VPN XXXX to TTTTTT
bandwidth 2048
ip address xxx.xxx.xxx.xxx 255.255.255.252
encapsulation ppp
fair-queue
compress stac caim 0
ppp authentication chap
end
!
Serial0/0 is up, line protocol is up
Hardware is PowerQUICC Serial
Description: VPN XXXXXX to TTTTTTTT
Internet address is xxx.xxx.xxx.xx/30
MTU 1500 bytes, BW 2048 Kbit, DLY 20000 usec,
reliability 255/255, txload 1/255, rxload 144/255
Encapsulation PPP, loopback not set
Keepalive set (10 sec)
LCP Open
Open: IPCP, CCP, CDPCP
Last input 00:00:00, output 00:00:00, output hang never
Last clearing of "show interface" counters 1w3d
Input queue: 0/75/13/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: weighted fair
Output queue: 0/1000/64/0 (size/max total/threshold/drops)
Conversations 0/2/256 (active/max active/max total)
Reserved Conversations 0/0 (allocated/max allocated)
Available Bandwidth 1536 kilobits/sec
5 minute input rate 1157000 bits/sec, 117 packets/sec
5 minute output rate 2000 bits/sec, 37 packets/sec
54182039 packets input, 3251132435 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
28280595 packets output, 706343947 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 output buffer failures, 0 output buffers swapped out
0 carrier transitions
DCD=up DSR=up DTR=up RTS=up CTS=up
Please, any advice with this issue will be very welcome.
Thanks a lot.
Samuel Bonete.
