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Cascading and Stacked Switch STP

Posted on 2012-09-19
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Last Modified: 2016-11-23
my customer has cisco core swtich in cascaded mode. recently they bought Dell M8024-K configured in stacked.
i did a switch failover at M8024-K, the network take about 10 PINGs drop then only resume.
we think this most likely is STP learning.

from both swtich show spannin-tree, we got this from the output..
Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec. both swtiches are using default STP parametres. if change the forward delay to lower at core switch will it fastern the STP learning state..? do i need to increase M8024-K swtich bridge IP to higher number..?

thanks
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Question by:hell_angel
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by:hell_angel
hell_angel earned 0 total points
ID: 38413954
attached with diagram..
Network-v1.jpg
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Expert Comment

by:Craig Beck
ID: 38415357
What STP mode do you use?
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by:hell_angel
ID: 38416216
M8024 is using RSTP. (default)
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hell_angel earned 0 total points
ID: 38416993
solutions found. to use RSTP for both swtich
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Author Closing Comment

by:hell_angel
ID: 38428037
n/a
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