Hello, I have a catalyst 4507 with a WS-X4418-GB blade. The ports on the blade are trunks connected to 3560 edge switches. whenever the ports begin to transmit more than 10Mbps, I will see total output drops in the order of 1M to 3M per day. The first two ports on this blade do not experience drops, but the rest of the ports do. Why am i seeing such large output drops on low utilized Gig ports?
Check your cabling (specifically, the jumpers) between the switches. A split pair on pins 3&6 will cause this kind of behaviour and is very common in handmade cables (or "bad" cables - kinked, twisted, severe bends, stretched, crushed, etc).
The issue is too much crosstalk on the cable (10Meg is half duplex ... crosstalk doesn't interfere because only one side is talking at a time).
Unfortunately these are fiber connections. Actually I beleive that I am running into oversubscription on the ports. In my original question I stated the type of blade and noted that only ports 1&2 are the only ones not dropping packets. That is because these two ports each have 1Gbps of bandwidth whereas the other ports share 1Gbps in groups of four.
This document gives several answers on frequently asked questions for PFRv3 channel state behavior.
Q1: What are all the channel operational states from a BR (border role) perspective and what are the rules/conditions to be in each st...
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