Wei Zhu wrote: > > I tried to connect to 2501, even use DCE/DTE to interconnect > serial0 and serial1 on 2514, seems the signal cannot go to the > line.
Earlier you said the interface on the 2514 was "up/down" or cycling between "up/up" and "up/down." That usually indicates a misconfiguration, not a low-level problem. Send us the config of both ends if you really want help. It sounds like you have 2 serial ports on the router in question? Can one of those ports connect to the other router with the same cable, while the other one can't? Are they using the same config? Then, you could have a hardware problem. Usually, the interface would be "down/down" in the case of a hardware problem, though, not "up/down." Which end of the circuit is acting as DCE? On some routers you can tell by doing "show controllers." Does that side have the clockrate command configured? It should. The other side should not. When the interface is "up/down," the router is reporting that it is unable to send and receive Data Link Layer keepalive frames. Possible causes for the interface being "up/down" are a misconfiguration on one of the routers, a failed local or remote CSU/DSU, or a problem with the carrier's network. A router could be misconfigured with the wrong encapsulation that doesn't match the router at the other end, for example. In the case of Frame Relay, the router could be using the wrong Local Management Interface (LMI) to send keepalives to the carrier's local switch. All the guesses we can give you are utterly useless without your configs, though. Copy and paste them into a message to GroupStudy for more help. Priscilla > > Thank you. > ----- Original Message ----- > From: "Ted Marinich" > To: > Sent: Thursday, December 19, 2002 5:28 PM > Subject: Re: 2514 serial port flipping between up and down, > [7:59501] > > > > This may be dumb question, but I have seen this happen when > connecting a > > high speed port to a low speed port. One side is default to > 1544 and the > > other cannot do better than 64K. > > > > So, what are you connecting to, specifically - 2514 to 2522? > > > > Again, I might not be in the loop, but thought I would put my > two cents in > > here. > > > > I did experience the exact same problem and my fix was to set > the right > > speed on the 2501 to connect to a low speed router interface > on a 2522. > > > > Ted > > Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=59591&t=59501 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
