Dell Networking Enterprise SONiC Reserved VLAN

Index

Introduction
What if we already have a VLAN in the default reserved VLAN range (3967 - 4094) being used.
Command syntax
Example
 

Introduction

Dell Enterprise SONiC reserves 128 VLANs for use of the various protocols. This was implemented from 4.0 and later.

By default, the reserved VLAN range for SONiC 4.0 is 3967 - 4094.
 

Note

Before a firmware upgrade from any Dell Sonic 3.X release to 4.0 or later release, check if you have any VLANs in the range 3967 - 4094 being used. If any of the VLANs in this range are already being used, find 128 continuous VLANs which are free and, after the upgrade reconfigures take place, change the reserved VLANs. Reserved VLANs were introduced in 4.0. We can change reserved VLANs after upgrade to 4.0 and later.

Below is a sample output where we attempt to configure a VLAN in the reserved range in 4.0 and later.

SONIC:~$ sonic-cli
SONIC# configure terminal
SONIC(config)# interface Vlan 3967
%Error: One or more given vlans is a reserved vlan

 

What if we already have a VLAN in the default reserved VLAN range (3967-4094) being used

 After a firmware upgrade from Sonic 3.X to 4.X release, if any existing VLANs are configured in the reserved VLAN range (3967 - 4094), they will continue to work as normal. However, no more VLANs in the default range are allowed to be configured. It is not recommended to leave configured VLANs in the reserved range.

The following actions may be taken:

• Remove any existing configuration VLANs in the default VLAN range of 3967 - 4094. Ensure that this step is taken with ample preparation time as an existing VLAN in the switch is changed, the connected switches and systems configurations should also be revised. 

Or

• Find 128 continuous unused VLANs and change the reserved VLAN range.

Command syntax

The default reserved VLANs can be changed by using the below commands:
 

Command	Explanation
SONIC:~$ sonic-cli	Enter Dell SONiC CLI
SONIC# configure terminal	Enter Configure terminal
SONIC(config)# system vlan <starting reserved vlan> reserve	Change the default reserved VLAN range. Specify the starting VLAN of the reserved VLAN and reserve 128 VLANs.
SONIC(config)# no system vlan <starting reserved vlan> reserve	Restore the default VLAN to 3967 - 4094. Check the present reserved VLAN range using "command show system vlan" command.

To verify, use the below commands:
 

Command	Explanation
SONIC:~$ sonic-cli	Enter Dell SONiC CLI
SONIC# show system vlan	Show system VLAN reserved range.
SONIC# show running-configuration | grep reserve	Check show running configuration for reserved VLANs.

 

Example

Consider that we want to change the reserved VLAN range to 100 - 227:

SONIC:~$ sonic-cli
SONIC# configure terminal
SONIC(config)# system vlan 100 reserve

SONIC# show system vlan reserved 
system vlan reservation: 100-227

SONIC# show running-configuration | grep reserve
system vlan 100 reserve

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