Trunk port configuration

In case two trunk port is configured on each switch and inter-connect. Can the switches use either one of the port for passing vlan traffic ? Do I need to configure LACP first to group these two ports ?

Tks
AXISHKAsked:
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arnoldCommented:
LAG I do not believe will work as each leg goes to a different switch.
Most managed switches have the loop detection where the switch will lockout the one of ports from which it sees.....
Are considering using route advertising.
Where you can advertise the direct path as lowest cost and the cross link as higher.  Unless a switch looses a trunk it will not route traffic via the interlink.

Defining on what issue/possible failure's impact you want to mitigate/minimize.
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AkinsdNetwork AdministratorCommented:
In case two trunk port is configured on each switch and inter-connect
Do I need to configure LACP first to group these two ports ?
If you mean 2 interfaces on 1 switch going to 2 interfaces on a 2nd switch, then the answer is yes.

By grouping, I think you meant bundling. You need an ether-channel for both ports to be active. If ether-channel (pagp or lacp) is not configured, spanning tree will block one port to prevent loop.
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AXISHKAuthor Commented:
Hi Arnold,

To clarify my understanding, suppose on switch A , two ports has been configured with trunk port that connecting to the corresponding ports on switch . It would not work, correct as switch will disable one port to prevent looping, correct ?

Tks
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AkinsdNetwork AdministratorCommented:
To clarify my understanding, suppose on switch A , two ports has been configured with trunk port that connecting to the corresponding ports on switch
I hope you meant corresponding port on another switch B.
Correct, if they are not bundled
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arnoldCommented:
<pre>
           /---------trunk port 1 switch A port12 trunk. \
Router                                                                           |
           \--------trunk port 1 switch B port 11 trunk. /
</pre>
Presumably this is what you are considering?
Most likely switch A will lock port 12 while switch B will lock port A.
Should switch A loose feed on port 1 from router, I am not sure what the convergence tine for port12 to be unblocked, the same is true for port 11 on switch B.
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AkinsdNetwork AdministratorCommented:
AXISHK
Please take a look at the link below if it matches what you're describing
http://www.9tut.com/etherchannel-tutorial
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