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ADSL running slow on Cisco router.

Hi Guys,

One of my routers seems to be running slow, I have done a "show interface" and the interface that appears to be running the ADSL shows the following. To me, it appears that the ADSL is syncing at 8829 Kb/s but the ATM0 interface has been configured to use a maximum of 939 Kb/s (BW 939 Kbit/sec). Is that correct?

Can I change it to the maximum the interface allows?

ATM0/0/0 is up, line protocol is up
   Hardware is HWIC-DSLSAR (with Alcatel ADSL Module)
   MTU 4470 bytes, sub MTU 4470, BW 939 Kbit/sec, DLY 540 usec,
      reliability 255/255, txload 23/255, rxload 216/255
   Encapsulation ATM, loopback not set
   Encapsulation(s): AAL5  AAL2, PVC mode
   23 maximum active VCs, 256 VCs per VP, 1 current VCCs
   VC Auto Creation Disabled.
   VC idle disconnect time: 300 seconds
   Last input 00:31:25, 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: 0
   Queueing strategy: Per VC Queueing
   5 minute input rate 1034000 bits/sec, 175 packets/sec
   5 minute output rate 85000 bits/sec, 55 packets/sec
      363574 packets input, 272762690 bytes, 0 no buffer
      Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
      0 input errors, 164 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
      132374 packets output, 26785767 bytes, 0 underruns
      0 output errors, 0 collisions, 0 interface resets
      0 unknown protocol drops
      0 output buffer failures, 0 output buffers swapped out

A "show dsl interface":

ATM0/0/0
Alcatel 20190 chipset information
                 ATU-R (DS)                      ATU-C (US)
Modem Status:    Showtime (DMTDSL_SHOWTIME)
DSL Mode:        ITU G.992.5 (ADSL2+) Annex A
ITU STD NUM:     0x03                            0x2
Chip Vendor ID:  'STMI'                          'IFTN'
Chip Vendor Specific:  0x0000                    0x8277
Chip Vendor Country:   0x0F                      0xB5
Modem Vendor ID: 'CSCO'                          '    '
Modem Vendor Specific: 0x0000                    0x0000
Modem Vendor Country:  0xB5                      0x00
Serial Number Near:    FOC12250RAFCISCO73993206
Serial Number Far:  Chip ID:     C196 (0)
DFE BOM:         DFE3.0 Annex A (1)
Capacity Used:   100%                            100%
Noise Margin:    -4.0 dB                          9.0 dB
Output Power:     9.5 dBm                        -4.0 dBm
Attenuation:     30.0 dB                         16.0 dB
FEC ES Errors:    0                               0
ES Errors:        1                               0
SES Errors:       1                               0
LOSES Errors:     1                               6
UES Errors:       0                              153
Defect Status:                       LOM     None
Last Fail Code:  None
Watchdog Counter: 0xBC
Watchdog Resets: 0
Selftest Result: 0x00
Subfunction:     0x00
Interrupts:      4174 (0 spurious)
PHY Access Err:  0
Activations:     1
LED Status:      OFF
LED On Time:     0
LED Off Time:    0
Init FW:         init_AMR-3.0.014_no_bist.bin
Operation FW:    AMR-3.0.014.bin
FW Source:       embedded
FW Version:      3.0.14

                  DS Channel1      DS Channel0   US Channel1       US Channel0
Speed (kbps):             0             8829             0               939
Cells:                    0          7334465             0           5473687
Reed-Solomon EC:          0                0             0                 0
CRC Errors:               0             1429             0                 0
Header Errors:            0              430             0                 0
Total BER:                0E-0           5249E-9
Leakage Average BER:      0E-0           5249E-9
Interleave Delay:         0               41             0                60
                         ATU-R (DS)      ATU-C (US)
Bitswap:               enabled            enabled
Bitswap success:          0                   0
Bitswap failure:          0                   0

Thanks,

Dario

Everyone's tags (4)
2 ACCEPTED SOLUTIONS

Accepted Solutions
Hall of Fame Super Gold

Re: ADSL running slow on Cisco router.

reliability 255/255, txload 23/255, rxload 216/255

Your DSL is slow because something is coming into your router from the WAN.  It's chewing 85% of your bandwidth.

Noise Margin:    -4.0 dB                          9.0 dB

Aaaaand you have a bad line.  -4?  That's awful.

ADSL running slow on Cisco router.

hi dario,

the bandwidth configured on the ATM interface has no bearing unless you're running some dynamic routing protocol on your network.

but based on your show interface atm0/0/0 output, you've had a high download rate (see rx load)

5 REPLIES
Hall of Fame Super Gold

Re: ADSL running slow on Cisco router.

reliability 255/255, txload 23/255, rxload 216/255

Your DSL is slow because something is coming into your router from the WAN.  It's chewing 85% of your bandwidth.

Noise Margin:    -4.0 dB                          9.0 dB

Aaaaand you have a bad line.  -4?  That's awful.

Re: ADSL running slow on Cisco router.

spot on leo! i've always pay attention to DSL attenuation.

dario,

you'll need to engage with your SP on this issue.

Hall of Fame Super Gold

ADSL running slow on Cisco router.

Thanks John.

ADSL running slow on Cisco router.

hi dario,

the bandwidth configured on the ATM interface has no bearing unless you're running some dynamic routing protocol on your network.

but based on your show interface atm0/0/0 output, you've had a high download rate (see rx load)

Re: ADSL running slow on Cisco router.

Thanks guys. The bad-connectivity problem is a long standing one and maybe you could help me figure out a solution.

show  int  Dialer 0

Dialer0 is up, line protocol is up (spoofing)

  Hardware is Unknown

  Description: ADSL2+ Connection to Internet

  Internet address is 203.161.99.68/32

  MTU 1450 bytes, BW 56 Kbit/sec, DLY 20000 usec,

     reliability 255/255, txload 54/255, rxload 202/255

  Encapsulation PPP, loopback not set

  Keepalive set (10 sec)

  DTR is pulsed for 1 seconds on reset

  Interface is bound to Vi1

  Last input never, output never, output hang never

  Last clearing of "show interface" counters 1d06h

  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  0/0/16 (active/max active/max total)

     Reserved Conversations 0/0 (allocated/max allocated)

     Available Bandwidth 42 kilobits/sec

  5 minute input rate 157000 bits/sec, 36 packets/sec

  5 minute output rate 12000 bits/sec, 3 packets/sec

     14808702 packets input, 1505222362 bytes

     6953355 packets output, 2010317578 bytes

At a first sight it seems that there is not a great internet connection. Is there any way to have a report like this for a time frame shorter than 5 mniutes?

Thanks,

Dario

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