stp root

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May 31st, 2009
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We have 2 core switches connected to each other.core switch 1 acts as root for vlans 3,5,7 and switch 2 for 2,4,6.

we have a server with 2 interfaces to each core.server is in vlan 3.

Can i make core switch 2 to act as root only for this server?


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mahmoodmkl Sun, 05/31/2009 - 23:17
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I think this is not possible as we cannot make a STP root switch for a particular end system it can be done on a per vlan basis.



Giuseppe Larosa Mon, 06/01/2009 - 03:46
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Hello Sam,

as explained by Mahmood this is not possible.

the root bridge is defined for each Vlan in PVST.

Note that the server will use the NICs in active/standby strategy so you cannot have both NICs active.

if the server tries to use both NICs (active/active) you get a lot of errors of type MAC address flapping.

to use both NICs they should be connected to a single switch and you should use etherchannel (LACP is recommended).

Hope to help



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