02-13-2018 04:21 AM - edited 03-08-2019 01:49 PM
Hi, i'm sorry if the question a little bit confusing.
So i'm currently learning about trunk troubleshoot (ccna).
In the book (ccna 200-125 official cert guide) said that both ends have to have same allowed trunk configuration.
But when i tried in packet tracer, i still can ping from PC1 (Vlan 10, 192.168.1.1) to PC2 (Vlan 10, 192.168.1.2) without trunk allowed vlan 10.
Config on Switch01 :
int fa0/2
sw mode trunk
I don't config on Switch02 because as you know it's automatically "trunked" from Switch01.
Could you pelase explain what happend?
I thought fa0/2 (Switch01) will not pass the vlan 10 frame (ping) because i didn't write "sw trunk allowed vlan 10".
Solved! Go to Solution.
02-13-2018 04:30 AM
Hi there,
If you don't explicitly define the allowed VLANs on a trunk link it will trunk them all.
Check the output from the command:
sh int trunk
cheers,
Seb.
02-13-2018 04:30 AM
Hi there,
If you don't explicitly define the allowed VLANs on a trunk link it will trunk them all.
Check the output from the command:
sh int trunk
cheers,
Seb.
02-13-2018 09:57 PM
Thx a lot very clear for me!
02-13-2018 05:18 AM
Hi
By default, all the common VLANs between the switches will cross the Trunk if you have not filtered it. Now if you have filtered one or both ends to avoid the VLAN 10, no communication should happen between the devices over the VLAN 10, otherwise it could be a bug on the PT.
02-13-2018 09:59 PM
Thank you very much sir for the enlighment.
I think i will build simple ccna lab at home to avoid bug from PT.
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