Can someone help me on this? Cisco ISR4331 VDSL is flapping every minute.
We already checked the cables but no issues found.
Sep 22 19:10:19.112 AEST: %BGP-3-NOTIFICATION: sent to neighbor 172.22.0.65 4/0 (hold time expired) 0 bytes 000062: Sep 22 19:10:19.113 AEST: %BGP-5-NBR_RESET: Neighbor 172.22.0.65 reset (BGP Notification sent) 000063: Sep 22 19:10:19.114 AEST: %BGP-5-ADJCHANGE: neighbor 172.22.0.65 Down BGP Notification sent 000064: Sep 22 19:10:19.114 AEST: %BGP_SESSION-5-ADJCHANGE: neighbor 172.22.0.65 IPv4 Unicast topology base removed from session BGP Notification sent 000065: Sep 22 19:10:22.168 AEST: %TRACK-6-STATE: 1 ip route 0.0.0.0/0 reachability Up -> Down 000066: Sep 22 19:10:49.182 AEST: %VDSL_DAEMON-3-VDSL_LINE_UPDOWN: Controller VDSL 0/1/0, line 0, changed state to down 000067: Sep 22 19:10:49.182 AEST: %CONTROLLER-5-UPDOWN: Controller VDSL 0/1/0, changed state to down 000068: Sep 22 19:10:51.183 AEST: %LINK-3-UPDOWN: Interface Ethernet0/1/0, changed state to down 000069: Sep 22 19:10:52.183 AEST: %LINEPROTO-5-UPDOWN: Line protocol on Interface Ethernet0/1/0, changed state to down 000070: Sep 22 19:12:47.754 AEST: %VDSL_DAEMON-3-VDSL_LINE_UPDOWN: Controller VDSL 0/1/0, line 0, changed state to up 000071: Sep 22 19:12:47.754 AEST: %CONTROLLER-5-UPDOWN: Controller VDSL 0/1/0, changed state to up 000072: Sep 22 19:12:49.754 AEST: %LINK-3-UPDOWN: Interface Ethernet0/1/0, changed state to up 000073: Sep 22 19:12:50.754 AEST: %LINEPROTO-5-UPDOWN: Line protocol on Interface Ethernet0/1/0, changed state to
up 000074: Sep 22 19:12:55.268 AEST: %BGP-5-ADJCHANGE: neighbor 172.22.0.65 Up 000075: Sep 22 19:13:37.184 AEST: %TRACK-6-STATE: 1 ip route 0.0.0.0/0 reachability Down -> Up
Here are the updates from the Telco
We have interpreted the test results, please see the summary below:
1. MAC detected on LST and on VPNE is the same.
2. Sync went down when the customer unplugged the modem, which further rules out jumpering issue:
WRI904986675432 AVC Test Result details Service Status Operational Status Down Service Stability UNSTABLE Request Date 17/09/2020 17:17 AEST
The service was in sync when the modem is connected: Operational Status Up Service Stability UNSTABLE
3. DSL Stability Profile: Stable
4. SELT is clear, no bridge tap detected.
As a result of the above, our next steps and action plan moving forward will be as follows:
1. SRA setting on the modem should be set to DYNAMIC
Seamless Rate Adaptation should be enabled as it allows the DSLAM port to request the modem to change bitrate (sync speed) without needing to drop sync. As the Seamless Rate Adaptation Settings are disabled it would cause Intermittent Service/Dropouts. Kindly change the Seamless Rate Adaptation (Seamless Rate Adaptation) settings in the Customer Premise Equipment to Dynamic and monitor the service for 2 days.
2. Make sure that dot1p is set to 0 3. Consider trying an alternate CPE
Here is the status of the controller VDSL 0/1/0
Controller VDSL 0/1/0 is UP
Daemon Status: UP
XTU-R (DS) XTU-C (US) Chip Vendor ID: 'BDCM' 'BDCM' Chip Vendor Specific: 0x0000 0xB1C5 Chip Vendor Country: 0xB500 0xB500 Modem Vendor ID: 'CSCO' ' ' Modem Vendor Specific: 0x4602 0x0000 Modem Vendor Country: 0xB500 0x0000 Serial Number Near: FOC2113611A 4331/K9 15.5(3)S4b Serial Number Far: Modem Version Near: 15.5(3)S4b Modem Version Far: 0xb1c5
XTU-R (DS) XTU-C (US) Trellis: ON ON SRA: disabled disabled SRA count: 0 0 Bit swap: enabled enabled Bit swap count: 299 0 Line Attenuation: 24.7 dB 0.0 dB Signal Attenuation: 0.0 dB 0.0 dB Noise Margin: 6.1 dB 21.3 dB Attainable Rate: 51789 kbits/s 12947 kbits/s Actual Power: 12.1 dBm 7.8 dBm Per Band Status: D1 D2 D3 U0 U1 U2 U3 Line Attenuation(dB): 19.5 48.5 72.8 8.5 39.5 59.0 N/A Signal Attenuation(dB): 25.0 48.2 N/A 8.5 39.0 N/A N/A Noise Margin(dB): 6.1 6.0 N/A 24.0 21.1 N/A N/A Total FECC: 6729332 0 Total ES: 54 0 Total SES: 54 0 Total LOSS: 1 0 Total UAS: 309 255 Total LPRS: 0 0 Total LOFS: 2 0 Total LOLS: 0 0
DS Channel1 DS Channel0 US Channel1 US Channel0 Speed (kbps): NA 49046 NA 7399 SRA Previous Speed: NA 0 NA 0 Previous Speed: NA 49096 NA 7399 Reed-Solomon EC: NA 3117618 NA 0 CRC Errors: NA 3133 NA 0 Header Errors: NA 0 NA 0 Interleave (ms): NA 0.00 NA 0.00 Actual INP: NA 69.00 NA 63.00
Not familiar with this VDSL configuration please help.
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