E1 links are by nature full-duplex. Actually there is no such term for E1 Links..
the E1 link will have separate Tx and Rx pairs of wire from the telco. TX signal and Rx signal have separate path end to end.
In your case if the E1 links are bundled in a multilink, then you have observe the traffic utilisation ( netflow) on the multilink only.
And one more point to add, are you having CSU/DSU devices to have the E1 terminated in the routers serial link. If so you can check the E1 channel configuration in the CSU/DSU device to cross verify that you are not using fractional E1..
The answer to (3) is no, the fact that the utilization never goes above 50% is not a good indication that the link might be performing in half duplex. A half duplex link can easily go over 50% in any particular direction if there is more traffic in one direction than the other - and that is usually the case if you think about, say, web browsing or FTP.
It may depend on how your analyser is analysing the traffic. What is the overall bandwidth figure it is using to base its calculation.
You can usually get a good indication of the bandwidth used from the show int on your router. But this assumes that you actually have enough traffic to go uver the 50%, sustained over the sampling period. Also that the windowing of your TCP sessions etc. will allow such traffic.
I doubt whether this is a half-duplex full-duplex issue - I think there is a more banale explanation. Could you provide some more details of your analysis precedure and results?
Finally, you should be aware that the bandwidth configured on the interface has no impact at all on the throughput through the interface. It only affects things like routing protocol metrics and % load calculations, but not the actual traffic.
At present this is what the show interface look like
Serial3/2 is up, line protocol is up
Hardware is 4ME1-UNBAL
Description: ***** *****************
MTU 1500 bytes, BW 2048 Kbit, DLY 20000 usec,
reliability 255/255, txload 33/255, rxload 67/255
Encapsulation PPP, LCP Open, multilink Open, crc 16, loopback not set
Restart-Delay is 0 secs
There is no information about duplex setting. Is the BW 2048 kbit the actual bandwidth or is it taken from the bandwidth command?
I am evaluating a net flow analyzer called "net flow analyzer 5" I am sure i configured the bandwidth in this tool correctly (3 * 2048kbit). I know (from user experience / performance) this link is almost fully utilized however the net flow analyzer tells me a different story.
During a 10 hour working day it report an average traffic in utilization of 49,93 % and a average out traffic of 24,15%
I would aspect that if I for example copy a 1000mb file over this link that the utilization will go op to a 100 %?
Or am I mistaken and are protocols like http, SMTP and NetBIOS very wan aware these day?s?
The bandwidth that you see in the show interface output, is just the value taken from the Bandwidth commands, it has nothing to do with the actual bandwidth on the link.
1)You can check the actual traffic flow on the link, using "show interface serial X/Y" command to see the actual input/ouput rate during peak hours and cross check with what is reported by the analyser.
2) I believe that the E1s in your setup is getting terminated via the LL modem and connected to the serial interface via v.35 interface. correct me if i'm wrong.
If modems are involved, check the channel settings on the modem and ensure that it is using all the timeslots of the e1. ( Just to be sure )
3) Moreover in your setup, you have mentioned that the serial link are multilinked.
If so, the traffic from the logical multilink interface will be shared across all the serial interface and this might be one reason that at any point, individual serial links are not utilising the full bandwidth.
For testing if possible, you can shut one serial link and observe the utilisation on the other serial link. ( shutting one link in the bundle will not affect the traffic flow ).
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