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| Sun Ethernet Fabric Operating System ### STP Administration Guide

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#### Hop Count

The hop count and path cost are used by the IST and the MST to compute the spanning tree topology. SEFOS MSTP provides a command to configure the hop count inside the region, which is applicable to all the IST and MST instances in that region. When a switch receives a BPDU with the hop count set to a maximum value from the root, the switch decrements the received remaining hop count value and propagates the new hop count value in the BPDU the switch generates. When the count reaches zero, the switch discards the BPDU.

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