Configure 7600 Ethertype

[yoram12345]

Hi ,

I have cisco 7606 and wanted to test wether cisco can drop frams due to invalid vlan ethertype

i have configured  the ports as

interface GigabitEthernet5/1

no ip address

switchport

switchport trunk encapsulation dot1q

switchport mode trunk

interface GigabitEthernet5/2

no ip address

switchport

switchport trunk encapsulation dot1q

switchport mode trunk

I have configured port  aslo with encapsulation trunk dot1q ethertpe 88a8

i injected traffic with vlan ethertype 0x8100

I expected to see drop traffic , however traffic passed in port to port

any suggestions ?

BR,

Yoram

[acampbell]

Yoram,

On an ES port, you can use the

switchport trunk dot1q ethertype value

Regards,
Alex.
Please rate useful posts.

interface configuration

command to program a custom ethertype value for the interface. This feature allows the switch to

interoperate with third-party vendor switches that do not use the standard 0x8100 ethertype to

identify 802.1Q-tagged frames. For example, if you set 0x1234 as the custom IEEE 802.1Q

ethertype on a trunk port, incoming frames containing that ethertype are assigned to the VLAN

contained in the tag following the ethertype as they would be with a standard 802.1Q trunk. Frames

arriving on a trunk port with either the standard ethertype (0x8100) or the custom ethertype value

are treated as valid IEEE 802.1Q traffic; frames containing any other ethertype are assigned to the

native VLAN of that trunk. Egress traffic that has an ethertype value of 0x8100 is mapped to the

customer ethertype.