Junos OS

Hi,

we are observing strange behavior with our ospf neighbor which create problem in neighborship establishment and fluctuation. we have faced this problem a weak before but resolved itself and facing same problem again. below are the logs.

marwat@RTR01-M10i-RE0> monitor traffic interface ae1.303

6:57:30.169248 In IP 10.2.0.1 > 224.0.0.5: OSPFv2, Hello, length 52 06:57:30.562605 In IP 10.2.0.3 > 224.0.0.5: OSPFv2, Hello, length 52 06:57:31.693868 Out IP truncated-ip - 26 bytes missing! 10.2.0.253 > 224.0.0.5: OSPFv2, Hello, length 56 06:57:31.697852 In IP 10.2.0.2 > 10.2.0.253: OSPFv2, Database Description, length 32 06:57:31.698099 In IP 10.2.0.3 > 10.2.0.253: OSPFv2, Database Description, length 32 06:57:31.706059 In IP 10.2.0.2 > 224.0.0.5: OSPFv2, Hello, length 56 06:57:31.706077 In IP 10.2.0.2 > 224.0.0.5: OSPFv2, Hello, length 56 06:57:31.706087 In IP 10.2.0.3 > 224.0.0.5: OSPFv2, Hello, length 56 06:57:31.706097 In IP 10.2.0.3 > 224.0.0.5: OSPFv2, Hello, length 56 06:57:31.710733 Out IP truncated-ip - 26 bytes missing! 10.2.0.253 > 224.0.0.5: OSPFv2, Hello, length 56 06:57:31.711595 Out IP truncated-ip - 2 bytes missing! 10.2.0.253 > 10.2.0.3: OSPFv2, Database Description, length 32 06:57:31.712240 Out IP truncated-ip - 2 bytes missing! 10.2.0.253 > 10.2.0.2: OSPFv2, Database Description, length 32 06:57:31.719004 Out IP truncated-ip - 26 bytes missing! 10.2.0.253 > 224.0.0.5: OSPFv2, Hello, length 56 06:57:31.750351 In IP 10.2.0.3 > 10.2.0.253: OSPFv2, Database Description, length 1352 06:57:31.752634 Out IP truncated-ip - 1322 bytes missing! 10.2.0.253 > 10.2.0.3: OSPFv2, Database Description, length 1352 06:57:31.753064 Out IP truncated-ip - 42 bytes missing! 10.2.0.253 > 10.2.0.3: OSPFv2, LS-Request, length 72 06:57:31.800055 In IP 10.2.0.3 > 10.2.0.253: OSPFv2, Database Description, length 32 06:57:31.800082 In IP 10.2.0.3 > 10.2.0.253: OSPFv2, LS-Request, length 48 06:57:31.800251 In IP 10.2.0.3 > 10.2.0.253: OSPFv2, LS-Update, length 208 06:57:31.804097 Out IP truncated-ip - 70 bytes missing! 10.2.0.253 > 10.2.0.3: OSPFv2, LS-Update, length 100 06:57:31.851201 In IP 10.2.0.3 > 224.0.0.5: OSPFv2, LS-Update, length 64 06:57:31.853091 In IP 10.2.0.1 > 224.0.0.6: OSPFv2, LS-Update, length 64 06:57:31.853698 In IP 10.2.0.2 > 224.0.0.5: OSPFv2, LS-Update, length 64 06:57:31.855016 Out IP truncated-ip - 34 bytes missing! 10.2.0.253 > 224.0.0.6: OSPFv2, LS-Update, length 64 06:57:31.893073 In IP 10.2.0.3 > 224.0.0.5: OSPFv2, LS-Update, length 104 06:57:31.893096 In IP 10.2.0.1 > 224.0.0.6: OSPFv2, LS-Update, length 68 06:57:31.894459 In IP 10.2.0.2 > 224.0.0.5: OSPFv2, LS-Update, length 104 06:57:32.804246 Out IP truncated-ip - 74 bytes missing! 10.2.0.253 > 224.0.0.6: OSPFv2, LS-Ack, length 104 06:57:32.854575 In IP 10.2.0.2 > 224.0.0.5: OSPFv2, LS-Ack, length 64 06:57:33.816404 In IP 10.2.0.3 > 224.0.0.5: OSPFv2, LS-Update, length 112 06:57:33.816430 In IP 10.2.0.1 > 224.0.0.6: OSPFv2, LS-Update, length 112 06:57:33.818311 Out IP truncated-ip - 14 bytes missing! 10.2.0.253 > 10.2.0.3: OSPFv2, LS-Ack, length 44 06:57:34.819296 Out IP truncated-ip - 14 bytes missing! 10.2.0.253 > 224.0.0.6: OSPFv2, LS-Ack, length 44 06:57:34.821796 In IP 10.2.0.2 > 224.0.0.5: OSPFv2, LS-Ack, length 64 06:57:36.044949 Out IP truncated-ip - 2 bytes missing! 10.2.0.253 > 10.2.0.2: OSPFv2, Database Description, length 32 06:57:36.152875 In IP 10.2.0.2 > 10.2.0.253:

traceoption logs attached for reference.

Ideas what's causing this problem....???

Attachment(s)

ospf trace.txt   13 KB 1 version

Hello,

I can see in the trace logs that ae1.303 is not seeing self in neighbor Hello packet

Oct 10 04:29:14.267329 OSPF neighbor 10.2.0.3 (ae1.303 area 0.0.0.0) state changed from Full to Init due to 1WayRcvd (event reason: neighbor is in one-way mode) (nbr helped: 0)

This could be because 10.2.0.3 is not receiving Hello from ae1.303.

Please check if:

1/ light level on the fiber link (if ae1 is using fiber) are above warning threshold

2/ cable is OK

3/ CRC errors are not incrementing on remote side of ae1.

Just last week I spent 2 days t'shooting dirty cable and low light levels on 10GE AggEth link causing BGP to lose packets and constantly retransmit.

HTH

Rgds

Alex

Hi Alex,

issue has been resolved by upgrading Switch firmware at remote end.

issue was due to LSA drop that was not reaching remote end routers due to switch firmware issue.

thanks for your valuable points.

Regards

Farooq