[c-nsp] Maximum switched ethernet daisy chain size

[Clinton Work]

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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Clinton Work
Airdrie, AB