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Community Member

Trunking config problem

Hi there

Case:

We have C6500 layer 3 swtich as a core device

and C3560 as access switch device running.

The C6500 Switch is the VTP Server and the

access switch is a vtp client.

Now we try to pluged a vpn dedicated hardware

(juniper sa-6000) to a port on the C6500 device.

This vpn box is able to trunking on the port we

plugged the box to it.

Config C6500:

int gig 3/26

no ip address

switchport

switchport trunk encapsulation dot1q

switchport mode trunk

switchport trunk native vlan 207

After we did "no shut" the interface...

There was no possibility to ping the ssl vpn box.

As we put the vpn box to a port on the access

switch (vtp client).

Config C3560:

int gig 0/20

switchport trunk encapsulation dot1q

switchport mode trunk

switchport trunk native vlan 207

We have been able to ping the vpn box...

Why is that???

What is wrong on the trunk config on the C6500 device???

Thx

AA

2 REPLIES
Silver

Re: Trunking config problem

If the user is unable to establish a connection across a trunk link, check the settings by issuing the set trunk command.

Check the trunking mode configured on both ends of the link. The trunking mode should be on or desirable on one end, and on, desirable, or auto on the other end. Check the trunk encapsulation type configured on both ends of the link to ensure it is valid. Check that the port is trunking and that the allowed VLAN list allows the desired VLAN range to pass through. On IEEE 802.1q trunks, make sure the native VLAN is the same on both ends of the trunk.

Community Member

Re: Trunking config problem

Hi, what's the "show interface trunk" command showing?

Where are you trying to ping from in each case?

Regards

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