Stp?

soccerwatch7

STP: Switch W-X-Y-Z connected like a rectangle
Cost is same on all, How STP converge
What if No STP is there?

NetworkNewb

CCNA topic...

It will then look at the Bridge ID to determine the path. lowest wins

If you don't have STP you will get broadcast storms.

soccerwatch7

Thank you!, If bridge ID is same? look for lowest MAC?

OfWolfAndMan

Bridge ID cannot be the same unless it's two ports going to the same switch. Bridge ID is calculated based on lowest bridge priority (Default 32768/)in increments of 4096 (Backslash is in the number because I can't write the original without making a smiley with shades). If bridge priority is set the same, then the winner becomes the device with the lowest MAC address (Which is also a part of the bridge ID)

soccerwatch7

Thank you

Priston

http://packetlife.net/media/library/11/Spanning_Tree.pdf

bharvey92

OfWolfAndMan wrote: »

Bridge ID cannot be the same unless it's two ports going to the same switch. Bridge ID is calculated based on lowest bridge priority (Default 32768/)in increments of 4096 (Backslash is in the number because I can't write the original without making a smiley with shades). If bridge priority is set the same, then the winner becomes the device with the lowest MAC address (Which is also a part of the bridge ID)

Just to add to this, if you are talking about plain old STP that's fine. If you starting adding VLANs dont forget to add on the VLAN ID, Eg: if STP priority is the default, the VLAN is VLAN 10 and the MAC is all A's the BID would be:

32768 + 10 and then AAAA.AAAA.AAAA