I had the impression that STP diameter defined the max number of bridges
between 2 points.
And the recommended value by the IEEE was 7 (using default timers).
--
Tassos
?????? ???????? wrote on 21/05/2009 12:25:
Definitely not more than 20 in a ring. As far as I know, IOS limits
the value of max-hops to 20. This means you can't have a BPDU
traverse more than 20 hops without being thrown away. If one pair of
switches in the ring experienced a total cut, your network would have
a diameter of 20, end to end.
this is STP limitation: MaxAge is by default 20 hops.
for IOS, you can change this value:
Switch(config)#spanning-tree vlan 1 max-age ?
<6-40> maximum number of seconds the information in a BPDU is valid
or for MST
Switch(config)#spanning-tree mst max-age ?
<6-40> maximum number of seconds the information in a BPDU is valid
value 40 is maximum bpdu hopcount for 3560 switch, for other models
there can be other upper limit.
--
wbr
sergey khalavchuk
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