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Cisco 7204 - NPE300 ATM PVC's problem

There is a Cisco 7204-NPE300 router in our network which is acting as PE router toaggregate a lot of MPLS and internet customers, also there is 2 ATM interface on the PE ATM1/0 aggregating most of the customers PVC, and the second interface using for Core PVC, both interfaces connected to Cisco BPX-8650 via MM-OC3 trunk.

The problem is all the customers PVC?s and Core PVC is daily flapping with the below log

Jul 4 17:05:57: Changing vc 101/420 vc-state to ATM_VC_NOT_VERIFIED

Jul 4 17:05:57: %LINEPROTO-5-UPDOWN: Line protocol on Interface

ATM1/0.420, changed state to down

Jul 4 17:05:57: Changing vc 101/421 vc-state to ATM_VC_NOT_VERIFIEDh

Jul 4 17:05:57: %LINEPROTO-5-UPDOWN: Line protocol on Interface

ATM1/0.421, changed state to do

Jul 4 17:14:25: Changing vc 101/457 vc-state to ATM_VC_UP

Jul 4 17:14:25: %LINEPROTO-5-UPDOWN: Line protocol on Interface

ATM1/0.457, changed state to up

Output from debug atm error/events

Jul 4 17:00:32: ATM(ATM1/0.184): VCD#99 VC 101/184 failed to echo OAM.

74989 tries

Jul 4 17:00:32: ATM(ATM1/0.51): VCD#25 VC 101/51 failed to echo OAM.

11544 tries

Jul 4 17:00:32: ATM(ATM1/0.296): VCD#151 VC 101/296 failed to echo OAM.

74988 tries

Jul 4 17:00:33: ATM(ATM1/0.93): VCD#49 VC 101/93 failed to echo OAM.

74989 tries

Jul 4 17:00:33: ATM(ATM1/0.243): VCD#139 VC 101/243 failed to echo OAM.

74990 tries

Jul 4 17:00:33: ATM(ATM1/0.420): VC(184) Bad SAP received 7E7E

Jul 4 17:00:33: ATM(ATM1/0.421): VC(185) Bad SAP received 7E7E

Jul 4 17:00:34: ATM(ATM1/0.99): VC(52) Bad SAP received 7E7E

Jul 4 17:00:34: ATM(ATM1/0.167): VCD#95 VC 101/167 failed to echo OAM.

74988 tries

Jul 4 17:00:34: ATM(ATM1/0.319): VC(160) Bad SAP received 7E7E

Jul 4 17:00:35: ATM(ATM1/0.185): VCD#100 VC 101/185 failed to echo OAM.

74989 tries

Jul 4 17:00:37: ATM(ATM1/0.116): VCD#61 VC 101/116 failed to echo OAM.

74991 tries

Jul 4 17:00:38: ATM(ATM1/0.115): VC(60) Bad SAP received 7E7E

Jul 4 17:00:38: ATM(ATM1/0.232): VCD#130 VC 101/232 failed to echo OAM.

74992 tries

Kindly advice

Best Regards,

Mounir Mohamed

  • WAN Routing and Switching
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