OcNOS-DC : Layer 2 Guide : Layer 2 Configuration Guide : Disabling Native VLAN Configuration on Trunk mode
Disabling Native VLAN Configuration on Trunk mode
This chapter contains sample configurations to check the functionality to drop the untagged traffic by disabling the native VLAN by configuring disable-native-VLAN.
Topology
Native VLAN Topology
Configuration
SW1
 
SW1#configure terminal
Enter configuration mode
SW1(config)#bridge 1 protocol mstp
Create bridge
SW1(config)#vlan database
Enter VLAN configuration mode
SW1(config-vlan)#vlan 2-10 bridge 1 state enable
Create 2-10 vlans
SW1(config-vlan)#exit
Exit VLAN configuration mode
SW1(config)#interface xe21
Enter interface configuration mode for xe21
SW1(config-if)#switchport
Configure switchport
SW1(config-if)#bridge-group 1
Associate interface with bridge-group 1
SW1(config-if)#switchport mode trunk
Configure port mode as trunk
SW1(config-if)#switchport trunk allowed vlan all
Allow all the VLANs on the xe21 port
SW1(config-if)#exit
Exit from interface mode
SW1(config)#interface xe6
Enter interface configuration mode for xe6
SW1(config-if)#switchport
Configure switchport
SW1(config-if)#bridge-group 1
Associate interface with bridge-group 1
SW1(config-if)#switchport mode trunk
Configure port mode as trunk
SW1(config-if)#switchport trunk allowed vlan all
Allow all the VLANs on the xe6 port
SW1(config-if)#exit
Exit from interface mode
SW1(config)#commit
Commit the candidate configuration to the running configuration
SW2
 
SW2#configure terminal
Enter configuration mode
SW2(config)#bridge 1 protocol rstp vlan-bridge
Create bridge
SW2(config)#vlan database
Enter VLAN configuration mode
SW2(config-vlan)#vlan 2-10 bridge 1 state enable
Create 2-10 vlans
SW2(config-vlan)#exit
Exit VLAN configuration mode
SW2(config)#interface xe6
Enter interface configuration mode for xe6
SW2(config-if)#switchport
Configure switchport
SW2(config-if)#bridge-group 1
Associate interface with bridge-group 1
SW2(config-if)#switchport mode trunk
Configure port mode as trunk
SW2(config-if)#switchport trunk allowed vlan all
Allow all the VLANs on the xe6 port
SW2(config-if)#exit
Exit from interface mode
SW2(config)#interface xe13
Enter interface configuration mode for xe13
SW2(config-if)#switchport
Configure switchport
SW2(config-if)#bridge-group 1
Associate interface with bridge-group 1
SW2(config-if)#switchport mode trunk
Configure port mode as trunk
SW2(config-if)#switchport trunk allowed vlan all
Allow all the VLANs on the xe13 port
SW2(config-if)#exit
Exit from interface mode
SW2(config)#commit
Commit the candidate configuration to the running configuration
Validation
Sending untagged, VLAN-5 and VLAN-6 traffic from IXIA-1 to IXIA-2. In the show bridge output we can see all the MAC entries learnt for all the traffics.
In the show vlan brief output for default VLAN interface xe21 is having port type as untagged (u).
SW1#show bridge
bridge 1 is running on mstp
Ageout time is global and if something is configured for vxlan then it will be a
ffected here also
Bridge CVLAN SVLAN BVLAN Port MAC Address FWD Time-out
---------+------+------+------+-----------+-----------------+-----+---------+
1 1 xe21 0010.9400.0001 1 300
 
SW1#show interface counters rate mbps
+-------------------+--------------+-------------+--------------+-------------+
| Interface | Rx mbps | Rx pps | Tx mbps | Tx pps |
+-------------------+--------------+-------------+--------------+-------------+
xe21 621.21 606650 0.00 0
xe6 0.00 0 621.21 606651
 
SW1#show vlan brief
Bridge VLAN ID Name State H/W Status Member ports
(u)-Untagged, (t)-Tagged
======= ======= ================ ======= ========== ==========================
1 1 default ACTIVE Success xe21(u) xe6(u)
1 2 VLAN0002 ACTIVE Success xe21(t) xe6(t)
1 3 VLAN0003 ACTIVE Success xe21(t) xe6(t)
1 4 VLAN0004 ACTIVE Success xe21(t) xe6(t)
1 5 VLAN0005 ACTIVE Success xe21(t) xe6(t)
1 6 VLAN0006 ACTIVE Success xe21(t) xe6(t)
1 7 VLAN0007 ACTIVE Success xe21(t) xe6(t)
1 8 VLAN0008 ACTIVE Success xe21(t) xe6(t)
1 9 VLAN0009 ACTIVE Success xe21(t) xe6(t)
1 10 VLAN0010 ACTIVE Success xe21(t) xe6(t)
Configuring Disable-Native-VLAN on Trunk mode
SW1
SW1(config)#interface xe21
Enter interface configuration mode for xe21
SW1(config-if)#switchport mode trunk disable-native-vlan
Configure disable native VLAN on trunk mode
SW1(config-if)#exit
Exit from interface mode
SW1(config)#commit
Commit the candidate configuration to the running configuration
 
Validation
After configuring disable-native-vlan, show vlan brief output we can see that xe21 interface is having port type as tagged (t).
SW1#show bridge
bridge 1 is running on mstp
Ageout time is global and if something is configured for vxlan then it will be a
ffected here also
Bridge CVLAN SVLAN BVLAN Port MAC Address FWD Time-out
---------+------+------+------+-----------+-----------------+-----+---------+
1 1 xe21 0010.9400.0001 1 300
 
SW1SW1#show vlan brief
Bridge VLAN ID Name State H/W Status Member ports
(u)-Untagged, (t)-Tagged
======= ======= ================ ======= ========== ==========================
1 1 default ACTIVE Success xe21(t) xe6(u)
1 2 VLAN0002 ACTIVE Success xe21(t) xe6(t)
1 3 VLAN0003 ACTIVE Success xe21(t) xe6(t)
1 4 VLAN0004 ACTIVE Success xe21(t) xe6(t)
1 5 VLAN0005 ACTIVE Success xe21(t) xe6(t)
1 6 VLAN0006 ACTIVE Success xe21(t) xe6(t)
1 7 VLAN0007 ACTIVE Success xe21(t) xe6(t)
1 8 VLAN0008 ACTIVE Success xe21(t) xe6(t)
1 9 VLAN0009 ACTIVE Success xe21(t) xe6(t)
1 10 VLAN0010 ACTIVE Success xe21(t) xe6(t)
 
SW1#show interface counters rate mbps
+-------------------+--------------+-------------+--------------+-------------+
| Interface | Rx mbps | Rx pps | Tx mbps | Tx pps |
+-------------------+--------------+-------------+--------------+-------------+
Xe21 864.88 844613 0.00 0
Xe6 0.00 0 0.00 0
 
SW1#show interface counters drop-stats
Interface xe21
Rx Policy Discards: 454522965
Rx EGR Port Unavail: 454522967