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April 13th, 2022 12:00
no switchport trunk allowed vlan blocks traffic to core switch until port link is forced down then up
Our network setup is not too complex. The switch has a management IP on our default vlan 1. And several ports have the same set of tagged vlans.
I am removing a vlan. Original port config:
interface ethernet1/1/53
switchport mode trunk
switchport access vlan 1
switchport trunk allowed vlan 2,10,20,40-50,424
no shutdown
The commands I enter are:
interface ethernet1/1/53
no switchport trunk allowed vlan 424
And this does remove tagged vlan 424 on that port:
interface ethernet1/1/53
switchport mode trunk
switchport access vlan 1
switchport trunk allowed vlan 2,10,20,40-50
no shutdown
However all traffic to the switch management IP is then dropped on that port until I physically unplug the cable and replug it. Traffic is still forwarded for all vlans to all devices properly except the switch management IP until the cable is replugged.
It seems that the link down/up event causes the switch to start accepting traffic to it's management IP again on that port for some reason.
Why is this? How do I remove a vlan without forcing a port down/up?
DELL-Young E
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April 13th, 2022 20:00
Hi, thanks for choosing Dell. Are you using using firmware OS6 or Os10? Is it possible that you may be on outdated firmware? Also please refer to this https://dell.to/36cE019 for the methods to remove the VLan from trunk port on N-Series(OS6).
Nathan Shearer
2 Posts
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April 14th, 2022 10:00
It is a Dell PowerSwitch S4148T-ON running OS10 10.3.1E
The OS6 commands for adding and removing vlans on a trunk port do not work. It seems the OS10 syntax is now different and I found only this syntax worked for adding and removing vlans, but causes the problem where traffic to the management IP is dropped:
Add a vlan in OS10:
Remove a vlan in OS10:
DELL-Charles R
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April 14th, 2022 13:00
Hello Nathan,
I have seen your post and wanted to let you know I'll have to do some research.
DELL-Young E
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April 14th, 2022 23:00
Hi Your firmware version 10.3.1E. has issues.
Please upgrade to the latest version.
10.3.1E >> 10.4.3.7 >> 10.5.0.9 > 10.5.3.4
Otherwise take backup of running-configuration and startup-configuration, startup.xml from switch and then upgrade the switch through ONIE mode to the latest version(10.5.3.4) directly after installing ONIE-updater and
ONIE-firmware.
POA:
1install ONIE-updater
2install ONIE-firmware
3NOS(OS10.10.5.3.4) https://dell.to/3uJBCsb
https://dell.to/3KPOZfW
If you need to have it looked closer, please have your service tag ready and call tech support and to open an official ticket. Have a good weekend.