We get the CRC errors out of the box, I don't believe there is a need to go down the path of setting custom UnDP to do that.
We have the same setup of C1841 with a Serial Link running IOS 12.4(17). Details are straight from Solarwinds WebUI.
If you do need to use the UnDP as well however then note sometimes the OID can change at times depending on the IOS.
Are you actually incurring any errors since you started testing the UnDP you set up before clearing counters?
Do you have a device you can properly test against, or a link to have known errors against?
Maybe request a change window on this link if that's the only option you have.
If you poll and get the same error count vs CLI showing errors then you need to check what your doing with the counter as well.
Node Details:
| SysObjectID | 1.3.6.1.4.1.9.1.620 | |
Operating System | 12.4(17), RELEASE SOFTWARE (fc1) | |
| IOS Image | C1841-ADVIPSERVICESK9-M | |
Interface Details:
| Name | Serial0/0/0 · ** Access Link ** | |
| Alias | ** Access Link ** | |
| Index | 3 | |
| Interface Type | Serial | |
