what does n-802.1q mean under trunking

Answered Question
Mar 21st, 2010
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Hi all,


I have 3550 switch where i have enabled trunk on port fa0/1


Switch#sh int trunk

Port        Mode             Encapsulation  Status        Native vlan
Fa0/1       desirable        n-802.1q       trunking      1******************

Port        Vlans allowed on trunk
Fa0/1               1-4094

Port                Vlans allowed and active in management domain
Fa0/1               1

Port                Vlans in spanning tree forwarding state and not pruned
Fa0/1 



Nei switch is 2950 and it does not show n-802.1q trunking it just shows  802.1q


2950T2#sh int trunk

Port        Mode         Encapsulation  Status        Native vlan
Fa0/1       desirable          802.1q         trunking      1


My question is why switch 3550 shows n-802.1q?


many thanks

mahesh

Correct Answer by glen.grant about 7 years 1 month ago

   It means it  "negotiated"  the trunking encapsulation type because it was not explicitly set in the config . If you actually put the "switchport trunk encapsulation dot1q"  on the switchport , that "n" will disappear.  When using desirable to set trunks it will negotiate on its own.

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Correct Answer
glen.grant Sun, 03/21/2010 - 19:02
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   It means it  "negotiated"  the trunking encapsulation type because it was not explicitly set in the config . If you actually put the "switchport trunk encapsulation dot1q"  on the switchport , that "n" will disappear.  When using desirable to set trunks it will negotiate on its own.

mahesh18 Sun, 03/21/2010 - 19:39
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Many thanks Glen again for explaining me about that.

mahesh

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