10-23-2014 08:11 AM - edited 03-07-2019 09:13 PM
Recently received a problem ticket indicating a threshold violation on Eobc 0/0. This is occurring on a 6509 with software 12.2(33)SXI8. When doing a 'show eobc" I see the following:
The counters are not registering at this time. What does this mean and how to I resolve this? Can you clear the eobc counters? Thanks!!
10-27-2014 07:18 PM
Hey!
As we know, EOBC is a bus-based Ethernet. In a shared-medium bus like EOBC, we expect to see some type of errors, such as CRC errors, sometimes. As long as the number of errors does not increase very quickly in a short period of time, we do not need to be concerned. There is no impact on the operation of the router when we observe a CRC errors because the protocols on the EOBC have a retry mechanism.
When several keep-alives are missed, it means communication is lost between the Application-Specific Integrated Circuits (ASICs) and the supervisor. In order to prevent this, the code contains a workaround that resets the EOBC when it sees that the messages do not increment constantly.
EOBC is a half-duplex out of band channel which is used for backplane communication between SP/RP and line cards. These errors are mostly benign, as deferred implies packet is ready but the media to send it on is busy. The reason for this is that the EOBC is a half-duplex interface, and the fact that there are deferred simply means that we are receiving when we attempt to transmit. With a half-duplex interface we cannot do that, so we defer the packet, and wait. Likewise, on a half-duplex interface collisions happen, and are part of normal operation.
Kind regards,
- Ed.
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