Tell you what, I got it to work just fine:
interface Serial4/1/3
no ip address
no ip directed-broadcast
ip route-cache distributed
loopback
no keepalive
no cdp enable
C7507MIX#sh int ser 4/1/3
Serial4/1/3 is up, line protocol is up
Hardware is cyBus Serial
MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec, rely 255/255, load 1/255
Encapsulation HDLC, crc 16, loopback set
Keepalive not set
Last input never, output never, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: weighted fair
Output queue: 0/1000/64/0 (size/max total/threshold/drops)
Conversations 0/0/256 (active/max active/max total)
Reserved Conversations 0/0 (allocated/max allocated)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
0 packets input, 0 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
0 packets output, 0 bytes, 0 underruns
0 output errors, 0 collisions, 2 interface resets
0 output buffer failures, 0 output buffers swapped out
3 carrier transitions
RTS up, CTS up, DTR up, DCD up, DSR up
Dave
Stefan Dozier wrote:
>
> I don't think it will Priscilla! Even with the encap HDLC,
> the DCD (carrier detect) control lead must be high in order
> for the interface status to be in an "up" condition. The
> only way I know to accomplish that is with a cable inserted
> or some type of serial loopback plug, if there's such an
> animal.
>
> And obviously you can't have "line protocol" in an "up" state
> if the interface status isn't in an "up" state!
>
> Stefan
>
> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
> Priscilla Oppenheimer
> Sent: Wednesday, November 28, 2001 7:55 PM
> To: [EMAIL PROTECTED]
> Subject: Re: serial up/up w/o cable [7:27604]
>
> At 06:52 PM 11/28/01, Tom E wrote:
> >How can you get a serial interface to go up/up without a cable connected?
> I
> >have tried loop and no keep.
>
> What's the encap? I thought this would work if you used HDLC.
>
> Priscilla
--
David Madland
Sr. Network Engineer
CCIE# 2016
Qwest Communications Int. Inc.
[EMAIL PROTECTED]
612-664-3367
"Emotion should reflect reason not guide it"
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=27684&t=27604
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