From: Howard C. Berkowitz (hcb@gettcomm.com)
Date: Wed Jun 18 2003 - 19:36:08 GMT-3
At 4:42 PM -0400 6/18/03, Yuki Hisano wrote:
>?Group,
>
>Since I did not get any responces last time, I am posting this again.
>I will appreciate any feedback. Thanks!
>
>I have come up with a few questions regarding Layer 1 capablity on router.
>
>My question is that by receiving CRC errors, does it mean the router is
>detecting all the deterioration on the circuit? Is there any errors that
>router is unable to detect?
Remember CRC (or more precisely FCS on Ethernet) is a layer 2 check,
so it will only detect problems with frames that are being
transmitted.
>
>Is that possible that if an interface receives excessive amount or certain
>amount of errors, that will take the interface to "down" state?
This used to be the case, after a maximum number of retries. I assume
it's still true.
>
>The reason I ask for this is that I always check the router's inteface when
>I become suspicious of any deterioration of the physical circuit. Sometimes
>I would need to check the DSU if there is one. But I dont know how to check
>when the router has a DSU attached inteface.
Is the DSU SNMP manageable? Do you have a path to it?
If the DSU interface has explicit clock pins, you should be able to
see that in the show controllers.
>
>I will appreciate your responses.
>
>Thanks.
>
>Yuki
>
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