normal access ports shown as trunk ports in "sh int trunk"

[banajahm]

hi,

i have a 4500 series switch that has vlan membership and trunk ports configured on it. when i do a "sh int trunk", the output shows trunk ports that are actually normal access ports. i know that becuase when i do a sh run, it shows that these ports are members of a vlan and not trunk ports. here is the output from sh int trunk:

Port Mode Encapsulation Status Native vlan

Gi5/45 auto n-802.1q trunking 1

Gi7/44 on 802.1q trunking 1

Po1 on 802.1q trunking 1

and here's the sh run output:

interface GigabitEthernet5/45

switchport access vlan 14

....

nterface GigabitEthernet7/44

switchport trunk encapsulation dot1q

switchport mode trunk

one more question. what is Po1? and waht is n-802.1q?

PS: this switch connects to another 4500 via 2 port channeled trunks which do not show in the sh int trunk output.

[NUNO PIMENTA]

Hi there:D

Regarding the Gi5/45 , you should try to force to access mode with switchport mode access command.

PO1 is the Port-channel logical interface that is created when you create a port-channel. It's automatic.

Regards

Nuno

[banajahm]

thanks for the reply,

i understand what you are suggesting. but why was 5/45 configured as a trunk (auto, and desirable in some other cases) to begin with?

[Georg Pauwen]

Hello,

that is because the default configuration of the interface is:

switchport mode dynamic desirable.

This means the interface is ready to autonegotiate trunking encapsulation and form a trunk link (using DTP) with a neighbor port in desirable, auto, or on mode.

HTH,

Georg

[banajahm]

hi,

if that were the case, wouldn't every port on every blade revert to being a trunk and be shown when donig "sh int trunk"?

also, 5/45 was configured as an access port and a member of VLAN 14 from the beginning.

thanks