36xx Router, Problem serial back-to-back connection

ize0213 · ‎03-01-2003

Hello,

I tried to connect two 3662 Router serial back-to-back together. I used on both sides NM-4T and IOS 12.1(5)T12. One router connected a serial DCE-Cable, one with a serial DTE-Cable. I set the clock rate and keepalive were on. But on both sides "Line up, Protocol down". Any ideas???

Best regards, Martin

deilert · ‎03-01-2003

You will not need to set the keepalive , it is 10 sec by default, do a sh controllers on both sides to ensure that the router beleives it is connected to the right kind of cable

ize0213 · ‎03-02-2003

sh controllers is OK, DEC and DTE.

Regards, Martin

gschertz · ‎03-01-2003

Have you set a protocol to use? ppp, hdlc, ect? You have connetivity.

The clock rate you set on the dce end. Then specify the protocol type

ize0213 · ‎03-02-2003

no protocol specified - therefore HDLC (default).

http://www.cisco.com/en/US/customer/tech/tk713/tk317/technologies_configuration_example09186a00800944ff.shtml

regards, Martin

a.manosca · ‎03-02-2003

You probably have done this but you could try it again:

- use different serial port combinations from the two 3660s.

- use another cable pair, or probably isolate one cable at a time.

HTH.

JORGE RODRIGUEZ · ‎03-02-2003

Could you post the configuration from both DCE & DTE sides ?

Jorge Rodriguez

preston · ‎03-02-2003

Be sure the clocksource is set to line on one and network on the other...just a hunch

ramesh.krishnan · ‎03-02-2003

hi,

when you connect back to back, there should be a clock source. pls make one of the devices to generate the clock for the circuit. put any of them on an "internal" clock and the rest on "external".

Ramesh

deilert · ‎03-03-2003

can you post the sh interface and the config from both sides please

ize0213 · ‎03-05-2003

Hi all,

after changing the chassis everything works fine. Obviously the chassis had a defect, but it was working with other NM-Modules - strange, isn't ist?

Thanks for all replys, best regards, Martin