© 2006 Cisco Systems, Inc. All rights reserved.ISCW v Teleworker Connectivity Verifying Broadband ADSL Configurations

© 2006 Cisco Systems, Inc. All rights reserved.ISCW v Layer Troubleshooting

© 2006 Cisco Systems, Inc. All rights reserved.ISCW v Determining the Layer to Troubleshoot Start troubleshooting at Layer 1. Check if the modem is successfully trained: –If it is, proceed to Layer 2. –If it is not, examine Layer 1.

© 2006 Cisco Systems, Inc. All rights reserved.ISCW v Determining the Layer to Troubleshoot (Cont.) Displays information specific to the ADSL for a specified ATM interface. show dsl interface atm number router# Router#show dsl interface atm 0 ATU-R (DS) ATU-C (US) Modem Status: Showtime (DMTDSL_SHOWTIME) DSL Mode: ITU G (G.DMT) ITU STD NUM: 0x01 0x1 Vendor ID: ALCB GSPN Vendor Specific: 0x0000 0x0002 Vendor Country: 0x00 0x00 Capacity Used: 97% 100% Noise Margin: 5.0 dB 6.0 dB Output Power: 9.5 dBm 12.0 dBm Interleave Fast Interleave Fast Speed (kbps):

© 2006 Cisco Systems, Inc. All rights reserved.ISCW v Layer 1 Issues

© 2006 Cisco Systems, Inc. All rights reserved.ISCW v Layer 1 Issues Check the ADSL_CD light: –ADSL_CD light is on: Proceed to Layer 2 troubleshooting –ADSL_CD light is off: Continue with Layer 1 troubleshooting Check whether the DSL (ATM) port on the Cisco router is plugged into the wall jack; if not, connect the port to the wall jack with a standard telephone cable (4-pin or 6-pin RJ-11 cable). Check the correctness of cable pinouts. Replace the faulty cable. Verify with service provider that DSL service has been enabled.

© 2006 Cisco Systems, Inc. All rights reserved.ISCW v Administratively Down State for an ATM Interface

© 2006 Cisco Systems, Inc. All rights reserved.ISCW v Is the ATM Interface in an Administratively Down State? ATM interface is administratively disabled. router#show interfaces atm 0 ATM0 is administratively down, line protocol is down Enable administratively disabled interface. router#configure terminal Enter configuration commands, one per line. End with CNTL/Z. router(config)#interface atm 0 router(config-if)#no shutdown router(config-if)#end router#copy running-config startup-config

© 2006 Cisco Systems, Inc. All rights reserved.ISCW v Correct DSL Operating Mode?

© 2006 Cisco Systems, Inc. All rights reserved.ISCW v Is the DSL Operating Mode Correct? Check the DSL modulation type used with the service provider. If modulation is not known, use the default auto operating mode for autodetection. Modifies the operating mode of the DSL for an ATM interface dsl operating-mode {auto | ansi-dmt | itu-dmt | splitterless} router(config-if)#

© 2006 Cisco Systems, Inc. All rights reserved.ISCW v Layer 2 Issues

© 2006 Cisco Systems, Inc. All rights reserved.ISCW v Layer 2 Issues Verify that a PVC is in use with the ping atm interface atm command. Check the VPI/VCI settings with the debug atm events command. router#debug atm events 2d16h: Data Cell received on vpi = 2 vci =32 PPPoA MUX router#ping atm interface atm seg-loopback Type escape sequence to abort. Sending 5, 53-byte segment OAM echoes, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 58/58/58 ms

© 2006 Cisco Systems, Inc. All rights reserved.ISCW v Data Received from the ISP

© 2006 Cisco Systems, Inc. All rights reserved.ISCW v Is Data Being Received from the ISP? router#show interfaces atm 0 ATM0 is up, line protocol is up Hardware is DSLSAR (with Alcatel ADSL Module) MTU 4470 bytes, sub MTU 4470, BW 128 Kbit, DLY 1600 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation ATM, loopback not set Keepalive not supported Encapsulation(s):AAL5, PVC mode 24 maximum active VCs, 256 VCS per VP, 1 current VCCs VC idle disconnect time:300 seconds Last input 01:16:31, output 01:16:31, output hang never Last clearing of "show interface" counters never Input queue:0/75/0 (size/max/drops); Total output drops:0 Queueing strategy:fifo 5 minute input rate 0 bits/sec, 0 packets/sec 5 minute output rate 0 bits/sec, 0 packets/sec 512 packets input, 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 426 packets output, bytes, 0 underruns 0 output errors, 0 collisions, 2 interface resets 0 output buffer failures, 0 output buffers swapped out

© 2006 Cisco Systems, Inc. All rights reserved.ISCW v Proper PPP Negotiation

© 2006 Cisco Systems, Inc. All rights reserved.ISCW v PPP Negotiation PPP stages: 1. LCP phase 2. Authentication phase 3. NCP phase Use the debug ppp negotiation command to verify the PPP negotiation process. Use the debug ppp authentication command to verify PPP authentication.

© 2006 Cisco Systems, Inc. All rights reserved.ISCW v Is PPP Negotiating Successfully? 06:36:03: Vi1 PPP: Treating connection as a callout 06:36:03: Vi1 PPP: Phase is ESTABLISHING, Active Open [0 sess, 1 load] 06:36:03: Vi1 PPP: No remote authentication for call-out 06:36:03: Vi1 LCP: O CONFREQ [Closed] id 1 len 10 06:36:03: Vi1 LCP: MagicNumber 0x03013D43 (0x D43) 06:36:05: Vi1 LCP: State is Open 06:36:05: Vi1 PPP: Phase is AUTHENTICATING, by the peer [0 sess, 1 load] 06:36:05: Vi1 CHAP: I CHALLENGE id 9 len 26 from "nrp-b" 06:36:05: Vi1 CHAP: Using alternate hostname client1 06:36:05: Vi1 CHAP: I SUCCESS id 9 len 4 06:36:05: Vi1 PPP: Phase is FORWARDING [0 sess, 1 load] 06:36:05: Vi1 PPP: Phase is AUTHENTICATING [0 sess, 1 load] 06:36:05: Vi1 PPP: Phase is UP [0 sess, 1 load] 06:36:05: Vi1 IPCP: I CONFREQ [REQsent] id 1 len 10 06:36:05: Vi1 IPCP: Address (0x ) 06:36:05: Vi1 IPCP: Address (0x ) 06:36:05: Vi1 IPCP: State is Open 06:36:05: Di1 IPCP: Install negotiated IP interface address :36:05: Di1 IPCP: Install route to :36:06: %LINEPROTO-5-UPDOWN: Line protocol on Interface Virtual-Access1, changed state to up

© 2006 Cisco Systems, Inc. All rights reserved.ISCW v Summary DSL troubleshooting starts at Layer 1. Check whether the modem has trained up with show dsl interface atm command. Check the ATM interface status using the show interface atm command. Check the administrative state of an ATM interface. Verify that the DSL operating mode is correct. Use the ping atm interface atm command to verify that a PVC is in use. Use the debug atm events command to verify the VPI/VCI values. Verify that data is sent to and received from the service provider. Determine that the PPP session is set up correctly.

© 2006 Cisco Systems, Inc. All rights reserved.ISCW v