Supermicro L2 User manual

L2 / L3 Switches
VLAN
Configuration Guide
Revision 1.0

VLAN Configuration Guide
Supermicro L2/L3 Switches
Configuration Guide
2
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VLAN Configuration Guide
Supermicro L2/L3 Switches
Configuration Guide
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Contents
1 VL N Configuration Guide .................................................................................................................... 4
1.1 VL N Basics ................................................................................................................................... 5
1.2 VL N Support ................................................................................................................................ 5
1.3 VL N Numbers .............................................................................................................................. 7
1.4 VL N Defaults ............................................................................................................................... 8
1.5 Creating VL Ns .............................................................................................................................. 9
1.6 Modifying VL Ns ......................................................................................................................... 10
1.7 Removing VL Ns ......................................................................................................................... 10
1.8 VL N Name ................................................................................................................................. 10
1.9 Port Based VL Ns ........................................................................................................................ 12
1.9.1 ccess Ports ........................................................................................................................ 13
1.9.2 Trunk Ports .......................................................................................................................... 15
1.9.3 Hybrid Ports ........................................................................................................................ 21
1.9.4 cceptable Frame Types ..................................................................................................... 24
1.10 M C Based VL N ........................................................................................................................ 26
1.11 Protocol Based VL N .................................................................................................................. 28
1.12 VL N Configuration Example ...................................................................................................... 32

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1VLAN Configuration Guide
This document describes the Virtual Local rea Network (VL N) feature supported in Supermicro Layer 2
/ Layer 3 switch products.
This document covers the VL N configurations for the below listed Supermicro switch products.
The majority of this document applies to all the above listed Supermicro switch products. In any
particular sub section however, the contents might vary across these switch product models. In those
sections the differences are clearly identified with reference to particular switch product models. If any
particular switch product model is not referenced, the reader can safely assume that the content is
applicable to all the above listed models.
Throughout this document, the common term “switch” refers to any of the above listed
Supermicro switch product models unless a particular switch product model is noted.
This
document covers only Layer 2 Static VL Ns
.
D
ynamic VL N feature
s
are
explained in
the
Dynamic VL N Configuration Guide.
Top of Rack Switches
• SSE-G24-TG4
• SSE-G48-TG4
• SSE-X24S
• SSE-X3348S
• SSE-X3348T
Blade Switches
• SBM-GEM-X2C
• SBM-GEM-X2C+
• SBM-GEM-X3S+
• SBM-XEM-X10SM

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1.1 VLAN Basics
Virtual L N (VL N) is a logical switched L N formed by segmenting physical Local rea Networks
(L Ns).
Segmenting a switched L N as one or more VL Ns provides the following advantages:
⇒Limits multicast and broadcast flood only to the required segments of the L N to save L N
bandwidth
⇒Provides secured L N access by limiting traffic to specific L N segments
⇒Eases management by logically grouping ports across multiple switches
Figure VLAN-1: VLANs on a Switched LAN
VL Ns work in same way as physical L Ns. The packets from the end stations of a VL N are switched
only to other end stations or network devices inside that VL N. To reach devices in another VL N, the
packets have to be routed from one VL N to another. Supermicro L2/L3 switches support such
InterVL N Routing to route packets across different VL Ns. InterVL N Routing is done by creating
“Layer 3 Interface VL Ns”.
This document covers only Layer 2
VL Ns
.
The Layer 3
Interface
VL N feature is explained in
the IP Configuration Guide.
1.2 VLAN Support
Supermicro switches support the three types of VL Ns – M C Based VL Ns, Protocol Based VL Ns and
Port Based VL Ns.
VL N 20
62.10.0.0 IP Subnet
VL N 20
VL N 40
44.23.0.0 IP Subnet
Switch

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Figure VLAN-2: Ty es of VLANs Su orted
Once a packet is received, a switch tries to identify the VL N for the received packet. This VL N
identification is done according to the procedure below.
If the incoming packet has a VL N tag and the VL N ID in the tag is not equal to zero, then this VL N ID
is used as the VL N for this packet.
If the incoming packet does not have a VL N tag (untagged packet) or if the VL N ID in the V LN tag is
equal to zero (priority tagged packet), the packet is considered as untagged/priority tagged and the
below steps are used to identify the VL N for this untagged/priority tagged packet.
Step 1: Use the source M C of the incoming packet and check the M C VL N mapping. If the VL N is
found for this source M C, that VL N ID is used as the VL N for this packet. If the M C VL N is not
found, proceed to the next step.
Step 2: Use the protocol field from the incoming packet layer 2 header and check the protocol VL N
table. If a protocol VL N is found, that VL N ID is used as the VL N for this packet. If a protocol VL N is
not found, proceed to the next step.
Step 3: Use the PVID from the port on which the packet is received as the VL N ID for this packet.
This VL N identification procedure is shown in Figure VL N-3: VL N Identification Procedure.
Once the VL N is identified for the received packet, it will be forwarded to any other member port of
this VL N based on the forwarding logic. If there are no other member ports for this VL N, the packet
will most likely be dropped unless it was routed or sent to the CPU or redirected by an CL rule.
M C Based
VL N
Protocol
Based VL N
Port Based
VL N

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Figure VLAN-3: VLAN Identification Procedure
1.3 VLAN Numbers
Supermicro switches support VL N identifiers from 1 to 4069 for user created VL Ns. VL N identifiers
4070 to 4094 are reserved for internal use.
The number of supported VL Ns differs among different models of Supermicro switch products as
shown in the table below.
Switch Product Number of VLANS Supported
SSE-G24-TG4 1024
Packet has
VLAN tag?
VLAN ID
!= 0
?
Check Src MAC for
MAC VLAN
Found MAC
VLAN ?
Check Protocol VLAN
Found Proto
VLAN ?
Use PVID
Found VLAN
Use VL N I
D
from VL N tag
Use MAC
VLAN ID
Use Protocol
VLAN ID
Use PVID as
VLAN ID
Yes
Yes
Yes
Yes
No
No
No
No

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SSE-G48-TG4
SBM-GEM-X2C
SBM-GEM-X2C+
SBM-GEM-X3S+
SSE-X24S
SBM-XEM-X10SM
SSE-X3348S
SSE-X3348T
4094
The command “
show vlan device info
” displays
the
maximum VL N identifier
s
and total
number of VL Ns supported by the switch.
ll the above switch models support 1024 M C based VL Ns.
Supermicro switches support 16 protocol groups for protocol based VL Ns. These 16 protocol groups
can be mapped to different VL Ns in every port. Same protocol group can be associated with different
VL N in different port.
1.4 VLAN Defau ts
Supermicro switches boot up with VL N 1, which is a default Layer 2 VL N. The switchable ports of all
switches are added to this default VL N 1 as access ports. This default setup helps switch forwarding
traffic across all the ports without the need of any user configuration.
Users can modify the port members of this VL N 1 by adding or removing any ports to this VL N 1 as
either tagged or untagged ports.
VL N 1 cannot be deleted by
the
user.
Instead
, a
user can remove all the ports from VL N 1
to make it nonfunctional. This can be done by using the “no orts” command in VL N the
configuration mode in CLI.
The port based VL N identifier (PVID) for all the switch ports is set to 1 by default. The PVID is used to
associate incoming untagged packets to port based VL Ns. Users can modify the PVID for switch ports to
any VL N identifier.
The switch port mode is set to “hybrid” for all switch ports by default. Users can change the port mode
as explained in the Port Based VL N Section.

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VL N 1 is configured as the default native VL N for all trunk interfaces. Users can change the native
VL Ns for trunk interfaces as explained in section Native VL N on Trunk.
Protocol based VL N is enabled by default.
Supermicro switches do not create VL Ns by default except
for
VL N 1. Users need to
create all the VL Ns used on their network in Supermicro switches. Trunk ports will be able
to carry only VL Ns created in Supermicro switches.
1.5 Creating VLANs
Follow the steps below to create VL Ns in Supermicro switches.
Ste Command Descri tion
Step 1
configure terminal
Enter
s
the configuration mode
Step 2
vlan
<
vlan-list
>
Create
s
a
VL N
using
vlan
command.
vlan-list – may be any vlan number or
list of vlan numbers. Multiple vlan
numbers can be provided as comma-
separated values. Consecutive vlan
numbers can be provided as a range,
such as 5-10.
User can configure VL Ns with
identifiers 1 to 4069.
Step 3
show vlan
D
isplay
s
the configured VL Ns
Step 4
write startu
-
config
Optional step
–
Save these VL N
configuration to be part of startup
configuration.
The examples below show various ways of creating VL Ns.
Create a VLAN with identifier 10
SMIS# configure terminal
SMIS(config)# vlan 10
SMIS(config-vlan)# exit
Create VLANs with identifiers 20 to 30, 50 and 100
SMIS# configure terminal
SMIS(config)# vlan 20-30,50,100
SMIS(config-vlan)# exit

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1.6 Modifying VLANs
To modify a configured VL N, follow the same steps used to create a VL N as explained in the Creating
VL Ns section.
1.7 Removing VLANs
Follow the steps below to remove VL Ns from Supermicro switches.
Ste Command Descri tion
Step 1
configure terminal
Enter the configuration mode
Step 2
no v
lan <
vlan-list
>
Remove
VL N
s
using
the
no v
lan
command.
vlan-list – may be any vlan number or
list of vlan numbers. Multiple vlan
numbers can be provided as comma
separated list. Consecutive vlan
numbers can be provided as ranges like
5-10.
Step
3
show vlan
To display the configured VL Ns
Step
4
write startu
-
config
Optional step
–
Save these VL N
configuration to be part of startup
configuration.
The below examples show sample ways to remove VL Ns.
Delete a VLAN with identifier 10
SMIS# configure terminal
SMIS(config)# no vlan 10
Delete VLANs with identifier 20 to 30, 50 and 100
SMIS# configure terminal
SMIS(config)# no vlan 20-30,50,100
SMIS(config-vlan)# exit
1.8 VLAN Name
VL Ns can be associated with a label name string for easier configuration and identification.
Follow the steps below to add or modify a name string to any VL N in Supermicro switches.

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Ste Command Descri tion
Step 1
configure terminal
Enter
s
the configuration mode
.
Step 2
vlan <
vlan-list
>
Enter
s
the
VL N configuration mode.
vlan-list – may be any VL N number or
list of VL N numbers. Multiple VL N
numbers can be provided as comma-
separated values. Consecutive VL N
numbers can be provided as a range,
such as 5-10.
If multiple VL Ns are provided, the
same name string provided in next step
will be associated with all these VL Ns.
Step 3
name <
vlan-name-string
>
ssociate
s a
name string to this VL N
using the name command.
vlan-name-string is any alphanumeric
string up to 32 characters.
Step 4
show vlan
D
isplay
s
the configured VL Ns
Step 5
write startu
-
config
Optional step
–
s
ave
s
this
VL N
configuration to be part of startup
configuration.
The example below shows the necessary steps to associate a name string to a VL N.
Associate name main_user_vlan to VLAN 50.
SMIS# configure terminal
SMIS(config)# vlan 50
SMIS(config-vlan)# name main_user_vlan
SMIS(config-vlan)# exit
Follow the steps below to remove a name string from any VL N in Supermicro switches.
Ste Command Descri tion
Step 1
configure terminal
Enter
s
the configuration mode
.
Step 2
vlan <
vlan-list
>
Enter
s
the
VL N configuration mode.
vlan-list – may be any VL N number or
list of VL N numbers. Multiple VL N
numbers can be provided as comma-
separated values. Consecutive VL N
numbers can be provided as a range,
such as 5-10.

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If multiple VL Ns are provided, the
name string of all these VL Ns will be
removed by the next step.
Step 3
no name
Removes associated name string from
this VL N.
Step 4
show vlan
D
isplay
s
the configured VL Ns
Step 5
write startu
-
config
Optional step
–
s
ave
s
this
VL N
configuration to be part of startup
configuration.
The example below shows steps to remove name string from a VL N.
Remove name from VLAN 50.
SMIS# configure terminal
SMIS(config)# vlan 50
SMIS(config-vlan)# no name
SMIS(config-vlan)# exit
1.9 Port Based VLANs
Port based VL Ns are the simplest and most useful type of VL N.
In port based VL N deployment, switch ports are associated with one or more VL Ns as member ports.
The VL N traffic sent on the ports is decided by the VL N membership modes of the ports. Mostly ports
are associated with VL Ns as either “access” port members or “trunk” port members. Supermicro
switches support an additional port mode called “hybrid”.
Port Channel interfaces also can be configured as VL N member ports.

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Figure VLAN-4: Port Based VLANs
1.9.1 Access Ports
ccess ports carry traffic of only one VL N. ny switch ports can be configured as access ports. Mostly
switch ports connected to end stations (computers / servers) that have only one type of traffic are
configured as access ports.
ccess ports cannot be configured to be part of more than one VL N.
When a switch port is configured as an access port to any VL N, that port is added as an untagged
member port of the given VL N. lso, the Port based VL N identifier (PVID) of that port is configured as
the given VL N.
Switch strips the VL N tag header from all packets sent out on an access port. Hence, access ports are
also called untagged ports.
When a packet is received on an access port, the switch identifies the VL N for the received packet from
the packet’s VL N tag header. If the received packet did not have a VL N identifier and the packet did
not match any M C or protocol VL N, the port PVID is used as VL N for all the received untagged and
priority tagged packets.
Follow the below steps to configure any port as the access port of any VL N.
Ste Command Descri tion
Step 1
configure terminal
Enter
s
the configuration mode
Step 2
interface
<interface-type> <interface-id>
or
interface range <interface-type> <interface-id>
Enter
s
the interface mode.
interface-type – may be any of the
VL N 20 & 30
VL N 40
Switch
B
VL N 20 & 30
Switch A
VL N 20 & 30
Trunk Links
ccess Links

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….
following:
gigabitethernet – gi
extreme-ethernet – ex
qx-ethernet – qx
port-channel – po
interface-id is in slot/port format for all
physical interfaces. It may be the port
channel identifier for port channel
interfaces.
To configure multiple interfaces, use
the “interface range …” command. To
provide a range use a hypen (-)
between the start and end interface
numbers.
E.g.: int range gi 0/1-10
To provide multiple interfaces or
ranges, use separate with a comma (,).
E.g.: int range gi 0/1-10, gi 0/20
Step 3
switch ort mode access
Set
s
the port mode as
the
access port.
Step
4
switch ort access vlan
<vlan-id>
Configure
s
the access VL N fo
r this
interface. The VL Ns identifiers may be
any VL N number from 1 to 4069.
The VL N provided in this command
must exist in the switch. If the VL N
does not exist, create it first.
Step
5
show vlan
ort config ort
<
iftype
> <
ifnum
>
D
isplay
s
the configured
mode and
accesses the VL N for this interface.
Step
6
write startu
-
config
Optional step
–
s
ave
s
this
VL N
configuration to be part of startup
configuration.
“
no switch ort mode
” command will change the port mode to
the
default hybrid mode. For
more details about hybrid mode, refer to section Hybrid Ports.
“no switch ort access vlan” command will set the access VL N as default VL N 1. The port
will continue to be the access port of VL N 1.
The examples below show various ways to create VL Ns with access ports.
Create a VLAN with identifier 50 and configure orts gi 0/2 to gi 0/10 as access orts to this VLAN.
SMIS# configure terminal

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SMIS(config)# vlan 50
SMIS(config-vlan)# exit
SMIS(config)# interface range gi 0/2-10
SMIS(config-if)# switch ort mode access
SMIS(config-if)# switch ort access vlan 50
SMIS(config-if)# exit
Create a VLAN with identifier 10 and configure ort channel 1 as access ort to this VLAN.
SMIS# configure terminal
SMIS(config)# vlan 10
SMIS(config-vlan)# exit
SMIS(config)# interface o 1
SMIS(config-if)# switch ort mode access
SMIS(config-if)# switch ort access vlan 10
SMIS(config-if)# exit
1.9.2 Trunk Ports
Trunk ports carry the traffic of one or more VL Ns. ny switch ports can be configured as trunk ports.
Mostly switch ports connected between switches are configured as trunk ports to carry multiple VL N
traffic across switches. Switch ports connected to end stations (computers / servers) that have multiple
VL Ns are also configured as trunk ports.
When a switch port is configured as trunk port, by default it will be added to all the VL Ns in the switch
as a tagged port. To restrict the VL Ns carried in trunk ports, refer section llowed VL Ns on a Trunk.
Trunk port
s
will not carry traffic for
VL Ns that are not configured in
a
switch.
For example, if the user wants to carry traffic for all the VL Ns from 1 to 1024 in a trunk
port, VL Ns 1 to 1024 need to be created in the switch using the “vlan” command.
switch adds the VL N tag header to all packets sent out on the trunk port except for native VL N
traffic. Supermicro switches support only IEEE 802.1Q encapsulation for VL N tag headers.
When a packet is received on a trunk port, the switch identifies the VL N for the received packet from
the packet’s VL N tag header. If the received packet did not have a VL N identifier and the packet did
not match any M C or protocol VL N, the port PVID is used to determine the VL N for all untagged and
priority tagged packets that are received.
native VL N identifier is configured as a PVID for the trunk ports. If the user has not configured a
native VL N, the default VL N 1 will be used as PVID for the trunk ports.
Follow the steps below to configure any port as a trunk port.
Ste Command Descri tion
Step 1
configure terminal
Enter
s
the configuration mode

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Step 2
interface
<interface-type> <interface-id>
or
interface range <interface-type> <interface-id>
….
Enter
s
the interface mode.
interface-type – may be any of the
following:
gigabitethernet – gi
extreme-ethernet – ex
qx-ethernet – qx
port-channel – po
interface-id is in slot/port format for all
physical interfaces. It may be a port
channel identifier for port channel
interfaces.
To configure multiple interfaces, use
the “interface range …” command. To
provide a range, use a hypen (-)
between the start and end interface
numbers.
E.g.: int range gi 0/1-10
To provide multiple interfaces or
ranges, separate with a comma (,).
E.g.: int range gi 0/1-10, gi 0/20
Step 3
switch ort mode
trunk
Set
s
the port mode as
a
trunk
port.
Step
4
show vlan ort config ort
<
iftype
> <
ifnum
>
and
show running-config
D
isplay
s
the configured
mode
for this
interface.
Step
5
write startu
-
config
Optional step
–
s
ave
s
this
VL N
configuration to be part of startup
configuration.
“
no switch ort mode
” command will change the port mode to
the
default hybrid mode. For
more details about hybrid mode, refer to the Hybrid Ports section.
The examples below show various ways to configure trunk ports.
Configure ort ex 0/1 and ex 0/2 as trunk orts.
SMIS# configure terminal
SMIS(config)# interface range ex 0/1-2
SMIS(config-if)# switch ort mode trunk
SMIS(config-if)# exit
Configure ort channel 1 as a trunk ort.

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SMIS# configure terminal
SMIS(config)# interface o 1
SMIS(config-if)# switch ort mode trunk
SMIS(config-if)# exit
1.9.2.1 Allowed VLANs on a Trunk
By default, all the VL Ns configured on a switch are allowed on the trunk interfaces. However, there
may be some cases where users would like to limit the number of VL Ns carried on the trunk ports. This
can be configured by following the steps below.
Ste Command Descri tion
Step 1
configure ter
minal
Enter
s
the configuration mode
Step 2
interface
<interface-type> <interface-id>
or
interface range <interface-type> <interface-id>
….
Enter
s
the interface mode.
interface-type – may be any of the
following:
gigabitethernet – gi
extreme-ethernet – ex
qx-ethernet – qx
port-channel – po
interface-id is in slot/port format for all
physical interfaces. It may be a port
channel identifier for port channel
interfaces.
To configure multiple interfaces, use
the “interface range …” command. To
provide a range, use a hypen (-)
between the start and end interface
numbers.
E.g.: int range gi 0/1-10
To provide multiple interfaces or
ranges, separate with a comma (,).
E.g.: int range gi 0/1-10, gi 0/20
Step 3
switch ort mode trunk
Set
s
the port mode as trunk port.
Step 4
Use any one of the below steps 4a to 4f based on
the need.
The
vlan-list
parameter used in
the
below commands could be any VL N
number or list of VL N numbers.
Multiple VL N numbers can be
provided as comma-separated values.
Consecutive VL N numbers can be
provided as a range, such as 5-10.
Step 4a
switch ort trunk allowed vlan
<
vlan-list
>
This command configures the
list of
allowed VL Ns on this trunk. Only the
VL Ns provided on the vlan-list will be

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carried over the trunk.
Step 4b
switch ort trunk allowed vlan add
<
vlan-list
>
This command adds the given list of
VL NS to the existing set of allowed
VL Ns on this trunk.
Step 4c
switch ort trunk allowed vlan remove
<
vlan-list
>
This command removes the given list of
VL NS from the existing set of allowed
VL Ns on this trunk.
Step 4d
switch ort trunk allowed vlan exce t
<
vlan-list
>
This command makes all the configured
VL Ns allowed on this trunk except for
the given list of VL Ns.
Step 4e
switch ort trunk allowed vlan all
This command sets
the default
behavior of allowing all VL Ns
configured in the switch as allowed
VL Ns on this trunk.
Step 4f
switch ort trunk allowed vlan none
This command removes all the allowed
VL Ns from this trunk.
Step 5
show vlan ort config ort
<
iftype
> <
ifnum
>
and
show running-config
D
isplay
s
the configured
,
allowed VL Ns
for this trunk interface.
Step 6
write startu
-
config
Optional step
–
s
ave
s
this
VL N
configuration to be part of startup
configuration.
t
runk port will not carry traffic for
any
VL Ns that are not configured in
the
switch.
For example, if a user wants to allow traffic for VL Ns 1 to 100, VL Ns 1 to 100 need to be
created in the switch using the “vlan” command.
The examples below show examples of configurations to allow VL Ns on trunk ports.
Configure to allow only VLANs 2 to 20 on trunk interface ex 0/1.
SMIS# configure terminal
SMIS(config)# vlan 2-20
SMIS(config-vlan)# exit
SMIS(config)# interface ex 0/1
SMIS(config-if)# switch ort mode trunk
SMIS(config-if)# switch ort trunk allowed vlan 2-20
SMIS(config-if)# exit
Configure to not to allow VLANs 30 to 50 on trunk interface ex 0/1.
SMIS# configure terminal
SMIS(config)# interface ex 0/1
SMIS(config-if)# switch ort mode trunk

VLAN Configuration Guide
Supermicro L2/L3 Switches
Configuration Guide
19
SMIS(config-if)# switch ort trunk allowed vlan exce t 30-50
SMIS(config-if)# exit
1.9.2.2 Native VLAN on Trunk
ll packets sent out on a trunk interface carry the 802.1Q VL N tag header. There may be cases in which
untagged packets need to be carried over a trunk interface. This is achieved by using the native VL N
feature of the trunk interface.
ny VL N can be configured on any trunk interface as a native VL N. Trunk interfaces will send native
VL N packets as untagged packets without adding the 802.1Q VL N tag header. Similarly, any untagged
packets received on a trunk interface will be considered to be native VL N packets.
The native VL N identifier will be configured as a PVID on trunk interfaces. VL N 1 is the default native
VL N for all trunk interfaces.
Figure VLAN-5: Native VLANs
Users can configure a native VL N for trunk interfaces by following the steps below.
Ste Command Descri tion
Step 1
configure terminal
Enter
s
the configuration mode
Step 2
interface
<interface-type> <interface-id>
or
interface range <interface-type> <interface-id>
….
Enter
s
the interface mode.
interface-type – may be any of the
following:
gigabitethernet – gi
extreme-ethernet – ex
qx-ethernet – qx
VL N 20 & 30
VL N 40
Switch
B
VL N
20 & 30
Switch A
Native VLAN 40
VL N
40
Trunk Links
ccess Links

VLAN Configuration Guide
Supermicro L2/L3 Switches
Configuration Guide
20
port
-
channel
–
po
interface-id is in slot/port format for all
physical interfaces. It may be a port
channel identifier for port channel
interfaces.
To configure multiple interfaces, use
the “interface range …” command. To
provide a range, use a hypen (-)
between the start and end interface
numbers.
E.g.: int range gi 0/1-10
To provide multiple interfaces or
ranges, separate with a comma (,).
E.g.: int range gi 0/1-10, gi 0/20
Step 3
switch
ort mode trunk
Set
s
the port mode as
a
trunk port.
Step 4
switch ort trunk
native
vlan
<
vlan-id
>
vlan-id -
The VL N
identifiers
may
be
from 1 to 4069.
The VL N provided in this command
must exist in the switch. If the VL N
does not exist, create it first.
Step 5
show vlan ort config ort
<
iftype
> <
ifnum
>
and
show running-config
D
isplay
s
the configured
native VL N
for
this trunk interface.
Step 6
write startu
-
config
Optional step
–
s
ave
s
this
VL N
configuration to be part of startup
configuration.
“
no switch ort
trunk native vlan
” command will reset the native VL N as VL N 1 for trunk
interfaces.
The examples below show examples of configuring native VL Ns for trunk ports.
Configure VLAN 20 as a native VLAN for trunk interface ex 0/1.
SMIS# configure terminal
SMIS(config)# vlan 20
SMIS(config-vlan)# exit
SMIS(config)# interface ex 0/1
SMIS(config-if)# switch ort mode trunk
SMIS(config-if)# switch ort trunk native vlan 20
SMIS(config-if)# exit