Are you running spanning-tree on the large metro Ethernet ring? Default STP settings limit you to 20 switches from the STP root for a stable topology. You have to consider the worst case distance from the STP root rather than the steady state one.
Pavel Skovajsa wrote:
Hello all, Recently I have found an interesting issue. I have found that on our network the packets that traverse more then 17 (18 and more) L2 ethernet switching hops all connected with MM fiber 1G links have lowered probability of arrival. The way I have found this is that our big ethernet ring with 30+ switches was cut (fiber issue) behind 18th switch from L3 switch, and everybody hosted after 18th switch has some interesting packet loss issues.See the smokeping details for 18th switch on http://img171.imageshack.us/img171/3777/hop18kn4.jpg.
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