11-07-2013 05:06 AM - edited 03-04-2019 09:31 PM
hi can anyone help?
i have a cisco 887VA router which lost connection to the WAN and I cant figure out why
the Controller VDSL 0 is up
the ATM0 Int is up
the sub int ATM0.1 is down
and i am unable to ping 8.8.8.8 from wan interface or lan interface
here is some interface outputs:
sh controller vdsl 0
Controller VDSL 0 is UP
Daemon Status: Up
XTU-R (DS) XTU-C (US)
Chip Vendor ID: 'BDCM' 'IFTN'
Chip Vendor Specific: 0x0000 0x827A
Chip Vendor Country: 0xB500 0xB500
Modem Vendor ID: 'CSCO' ' '
Modem Vendor Specific: 0x4602 0x0000
Modem Vendor Country: 0xB500 0x0000
Serial Number Near: FCZ173691XR 887VA-S 15.3(1)T
Serial Number Far: 2301230123012301230123012301230
Modem Version Near: 15.3(1)T
Modem Version Far: 0x827a
Modem Status: TC Sync (Showtime!)
DSL Config Mode: AUTO
Trained Mode: G.992.5 (ADSL2+) Annex A
TC Mode: ATM
Selftest Result: 0x00
DELT configuration: disabled
DELT state: not running
Trellis: ON ON
SRA: disabled disabled
SRA count: 0 0
Bit swap: enabled enabled
Bit swap count: 9573 0
Line Attenuation: 33.0 dB 19.1 dB
Signal Attenuation: 38.9 dB 19.4 dB
Noise Margin: 3.1 dB 6.0 dB
Attainable Rate: 17452 kbits/s 1076 kbits/s
Actual Power: 0.0 dBm 12.6 dBm
Total FECC: 311947 0
Total ES: 294 0
Total SES: 27 0
Total LOSS: 0 0
Total UAS: 57 57
Total LPRS: 0 0
Total LOFS: 0 0
Total LOLS: 0 0
Full inits: 1
Failed full inits: 1
Short inits: 1
Failed short inits: 0
Firmware Source File Name (version)
-------- ------ -------------------
VDSL embedded VDSL_LINUX_DEV_01212008 (1)
Modem FW Version: 120306_1254-4.02L.03.A2pv6C035j.d23j
Modem PHY Version: A2pv6C035j.d23j
Vendor Version: Ap6v35j.23j 68
DS Channel1 DS Channel0 US Channel1 US Channel0
Speed (kbps): 0 15199 0 1076
SRA Previous Speed: 0 0 0 0
Previous Speed: 0 0 0 0
Total Cells: 0 1045761926 0 73867432
User Cells: 0 9862 0 2948
Reed-Solomon EC: 0 311947 0 0
CRC Errors: 0 1506 0 0
Header Errors: 0 10070 0 0
Interleave (ms): 0.00 7.96 0.00 0.34
Actual INP: 0.00 1.00 0.00 0.00
sh run
interface ATM0
no ip address
no atm ilmi-keepalive
!
interface ATM0.1 point-to-point
zone-member security out-zone
logging event subif-link-status
crypto map ADAPTVPN
pvc 0/38
oam-pvc manage
encapsulation aal5mux ppp dialer
dialer pool-member 1
!
!
interface FastEthernet0
no ip address
!
interface FastEthernet1
no ip address
!
interface FastEthernet2
no ip address
!
interface FastEthernet3
no ip address
!
interface Vlan1
description $FW_INSIDE$
ip address MYLOCALIPANDSUBNET
no ip redirects
no ip unreachables
no ip proxy-arp
ip nbar protocol-discovery
ip flow ingress
ip nat inside
no ip virtual-reassembly in
zone-member security in-zone
!
interface Dialer0
mtu 1492
ip address negotiated
ip nat outside
ip virtual-reassembly in
zone-member security out-zone
encapsulation ppp
dialer pool 1
dialer-group 2
ppp authentication chap pap callin
ppp chap hostname
MYISPHOSTNAME
ppp chap password 7 MYISPPASSWORD
ppp pap sent-username
MYISPHOSTNAME
password 7 MYISPPASSWORD
no cdp enable
11-07-2013 07:29 AM
Can you post a sh ip int brief please?
11-07-2013 07:37 AM
HSTCIS887DATA1#show ip int brie
Interface IP-Address OK? Method Status Protocol
ATM0 unassigned YES NVRAM up up
ATM0.1 unassigned YES manual down down
Dialer0 unassigned YES IPCP up up
Ethernet0 unassigned YES NVRAM down down
FastEthernet0 unassigned YES unset down down
FastEthernet1 unassigned YES unset up up
FastEthernet2 unassigned YES unset down down
FastEthernet3 unassigned YES unset down down
NVI0 unassigned YES unset administratively down down
Virtual-Access1 unassigned YES unset up up
Virtual-Access2 unassigned YES unset down down
Vlan1 172.24.105.254 YES NVRAM up up
11-07-2013 07:42 AM
Thjis would indicate no sync on the line, the VDSL will retain the stats from the last time it was synched unless rebooted. Try a reload of the router or the shut/no shut on the atm interface.
The noise margin is low, you shoukld be aiming for 10dB but 6dB is acceptable, if there is still no sync after a reload I would log a call with your ISP
11-07-2013 07:48 AM
thanks james
does that mean there is too much noise on the line? which figure is the important one 3.1db or 6.0db as it lists 2 in the noise margin?
thanks
11-07-2013 07:54 AM
The 3.1 is the most important one as that is downstream. Noise margin is also know as SNR or signal to noise margin, so the lower the number either the more noise there is or the signal strength has degraded too much. With attenuation of 33dB it could be either cause.
The supplier will need to look at putting interleaving on the circuit. The rule of thumb is the lower the attenuation the better and the higher the noise margin the better. Attenuation is mainly to do with copper line quality and the length of the line from the property to the DSLAM.
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