01-30-2013 05:30 AM
Hi there. I have a Sf300 switch running firmware 1.2.7.76.
I've noticed that whenever I removed a tagged vlan from a trunk port, the native Untagged vlan is always reset to 1.
This seems to be a bug with the firmware.
Has anyone else run into this? Is there a fix?
Thanks.
01-30-2013 05:14 PM
Hi Jule, I'm not sure what you mean. By default, vlan 1 is the native and default vlan. You may change the native vlan if you make the vlan id the untagged member of the port. There is no such thing as a tagged native vlan. There is a such thing as a tagged default vlan.
Also, depending on what you're doing, you may be running in to macro issues since the macro will not automatically update the untagged native vlan. But there isn't enough information or scenario to determine this statement.
-Tom
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01-31-2013 08:24 AM
Tom,
I've recreated the problem... please check out the series of commands below:
SAM-A1-SW-1#show interfaces switchport fa1
Port : fa1
Port Mode: Trunk
Gvrp Status: disabled
Ingress Filtering: true
Acceptable Frame Type: admitAll
Ingress UnTagged VLAN ( NATIVE ): 29
Port is member in:
Vlan Name Egress rule Port Membership Type
---- -------------------------------- ----------- --------------------
29 29 Untagged Static
70 70 Tagged Static
80 80 Tagged Static
Forbidden VLANS:
Vlan Name
---- --------------------------------
Classification rules:
Mac based VLANs:
Group ID Vlan ID
------------ -------
SAM-A1-SW-1#conf t
SAM-A1-SW-1config)#int fa1
SAM-A1-SW-1(config-if)#switchport trunk allowed vlan remove 80
SAM-A1-SW-1(config-if)#exit
SAM-A1-SW-1(config)#do show interfaces switchport fa1
Port : fa1
Port Mode: Trunk
Gvrp Status: disabled
Ingress Filtering: true
Acceptable Frame Type: admitAll
Ingress UnTagged VLAN ( NATIVE ): 1
Port is member in:
Vlan Name Egress rule Port Membership Type
---- -------------------------------- ----------- --------------------
1 1 Untagged System
29 29 Tagged Static
70 70 Tagged Static
Forbidden VLANS:
Vlan Name
---- --------------------------------
Classification rules:
Mac based VLANs:
Group ID Vlan ID
------------ -------
SAM-A1-SW-1(config)#
Notice how after i removed the tagged vlan 80, the system has changed my Untagged vlan from 29 to 1.
Any suggestions?
01-31-2013 08:41 AM
Either because you're using GVRP or because the macro is updating and the native vlan on the macro was not added to specify that the native vlan should be 29.
-Tom
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01-31-2013 10:27 AM
Tom, I've checked and we are not suing GVRP. I'm not sure that I understand your comments about the macro...
Sorry, I'm just new to the networking world, so I apologize for being "thick".
Can you give a few more details about what you mean?
Thank you
01-31-2013 10:40 AM
Hi Jule, here is a topic which gives a good visual about this
https://supportforums.cisco.com/thread/2177613
-Tom
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