Diagnostics for Internet Outage

Today we had an outage on our Internet connection. This post is a reminder to myself of the commands to use on the router to determine if the link is broken and to figure out why the ISDN dialer has fired up.

router# show isdn status

Global ISDN Switchtype = basic-net3
ISDN BRI0/0 interface
dsl 0, interface ISDN Switchtype = basic-net3
Layer 1 Status:
ACTIVE
Layer 2 Status:
TEI = 114, Ces = 1, SAPI = 0, State = MULTIPLE_FRAME_ESTABLISHED
Layer 3 Status:
0 Active Layer 3 Call(s)
Active dsl 0 CCBs = 0
The Free Channel Mask:  0x80000003
Total Allocated ISDN CCBs = 0
Global ISDN Switchtype = basic-net3

Layer 1 - should display ACTIVE
Layer 2 - should display MULTIPLE_FRAME_ESTABLISHED
Layer 3 - this is the last stage, only performed one the dialer connects

router# show interface Serial0/0

Serial0/0 is up, line protocol is up
  Hardware is PowerQUICC Serial
  Internet address is X.X.X.X/30
  MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,
     reliability 255/255, txload 32/255, rxload 255/255
  Encapsulation HDLC, loopback not set
  Keepalive set (10 sec)
  Last input 00:00:00, output 00:00:00, output hang never
  Last clearing of "show interface" counters never
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 792
  Queueing strategy: weighted fair
  Output queue: 0/1000/64/736 (size/max total/threshold/drops)
     Conversations  0/117/256 (active/max active/max total)
     Reserved Conversations 0/0 (allocated/max allocated)
     Available Bandwidth 1158 kilobits/sec
  5 minute input rate 2010000 bits/sec, 251 packets/sec
  5 minute output rate 198000 bits/sec, 183 packets/sec
     2498543 packets input, 1934240795 bytes, 0 no buffer
     Received 1204 broadcasts, 0 runts, 0 giants, 0 throttles
     58 input errors, 7 CRC, 50 frame, 0 overrun, 0 ignored, 1 abort
     2009469 packets output, 310463828 bytes, 0 underruns
     0 output errors, 0 collisions, 41 interface resets
     0 output buffer failures, 0 output buffers swapped out
     8 carrier transitions
     DCD=up  DSR=up  DTR=up  RTS=up  CTS=up

The ISDN will only dial if the link status is DOWN/DOWN

Hopeful, the fault wont occur again any time soon.

Tags: connection, ISDN, router

This entry was posted on April 21, 2010 at 2:10 pm. You can follow any responses to this entry through the RSS 2.0 feed. Both comments and pings are currently closed.

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