Re: serial up/up when not connected?

From: Brian Dennis (brian@xxxxxx)
Date: Fri Feb 22 2002 - 21:11:47 GMT-3


   
interface Serial0
 no ip address
 no ip route-cache
 no ip mroute-cache
 no keepalive
 dialer dtr

R1#sho int s0
Serial0 is up (spoofing), line protocol is up (spoofing)
  Hardware is HD64570
  MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation HDLC, loopback not set
  Keepalive not set
  Last input never, output never, output hang never
  Last clearing of "show interface" counters 00:02:50
  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)
     Available Bandwidth 1158 kilobits/sec
  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, 4 interface resets
     0 output buffer failures, 0 output buffers swapped out
     0 carrier transitions
     DCD=down DSR=down DTR=down RTS=down CTS=down
R1#

Brian Dennis, CCIE #2210 (R&S)(ISP Dial)

On Friday 22 February 2002 02:21 pm, Tim Szigeti wrote:
> interesting question (Global Knowledge ACPC 2 - Prep Lab 1 - 1.2f):
>
> f) on R6 configure its serial 1 interface to be in the UP/UP state even
> though its not connected.
>
>
> this is easy with an ethernet (no keep) - but what's the trick for a
> serial?
>
> please let me know if you do.
>
> -tim



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