[c-nsp] Input error from Cisco Switch and Juniper Router

[Eric Van Tol]

> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-
> bounces at puck.nether.net] On Behalf Of Kelvin Goei
> Sent: Thursday, January 15, 2009 11:17 PM
> To: cisco-nsp at puck.nether.net
> Subject: [c-nsp] Input error from Cisco Switch and Juniper Router
> 
> Hi All,
> 
> We are experiencing issue with connectivity between Cisco Switch to
> Juniper Router. We are seeing the input error keep increasing in our Cisco
> Switch.
> 

CRC errors are normally caused by a physical issue such as a bad cable, port, or light levels.  You mentioned that you changed the cable on the Cisco side, what about the Juniper side?  Check to make sure that the fiber connectors are clean along the entire path of the RX cable to the Cisco and that your light levels are within spec.  Do you know the distance of the cable between the two?

Policed discards and L3 incompletes wouldn't cause CRC errors, but as a previous poster mentioned, you'll want to disable CDP/LLDP/STP on the Cisco side to prevent policed discards from accruing.  L3 incompletes are an annoying counter on Juniper that are normally impossible to figure out without a packet sniffer, but in my experience have not been service affecting.

-evt