I have two LANS which I have connected using 2611 and 1601 cisco routers interfaced by codex modems on each end and a 14.4 k data line.My problem is when I ping my serial interfaces, the suceess rate ranges from 40 to 60 % which to me shows something is not ok. When I checked the interface i.e s1/3 statistics on the 2611 router which I am using to connect to the other router I have noted the following on the last line of the interface statistics:
DCD=up DSR=up DTR=up RTS=up CTS=down
I dont know if the loss of the packets is ralated to the CTS being down or I dont know what causes CTS to be down? The rest of the statistics of the interface is as shown dowm.
CTS can be configured on the modem to be high, also you should clear the counters on the serial interface and monitor the interface, It does look like the link between the modems is poor. You should also be able to monitor the state of the circuits on the modems by looking at signal to noise ratios, db levels , impluse hits .
CTS is the hardware flow control signal used by DCE. CTS will be low if the DCE (modem) buffer overfills. Low CTS is the indication to DTE (router) for not to send data. CTS will be high once modem buffer recovers. So CTS low may not be the problem here in your case.
Looking on the interface stats, i can see that we have many input errors along with CRC errors too. So i think something is wrong on the receiving side which creates those errors. Try changing the modems if possible.
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...