OcNOS DC : Layer 2 Guide : Layer 2 Configuration : Disabling Native VLAN Configuration
Disabling Native VLAN Configuration
This chapter contains sample configurations to check the functionality to drop the untagged traffic by disblaing the native vlan by configuring acceptable-frame-type vlan-tagged.
Topology
Native VLAN Topology
Configuration
SW1
 
SW1#configure terminal
Enter configuration mode
SW1(config)# bridge 1 protocol rstp vlan-bridge
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 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 hybrid
Configure port mode as hybrid
SW1(config-if)# switchport hybrid allowed vlan all
Allow all the vlans on the xe6 port
SW1(config-if)#exit
Exit from interface 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 hybrid
Configure port mode as hybrid
SW1(config-if)# switchport hybrid allowed vlan all
Allow all the vlans on the xe21 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 hybrid
Configure port mode as hybrid
SW2(config-if)# switchport hybrid 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 hybrid
Configure port mode as hybrid
SW2(config-if)# switchport hybrid 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 o/p 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 rstp vlan-bridge
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 0000.0000.0003 1 300
1 5 xe21 0000.0000.0005 1 300
1 6 xe21 0000.0000.0006 1 300
 
SW1#sh int counters rate mbps
+-------------------+--------------+-------------+--------------+-------------+
| Interface | Rx mbps | Rx pps | Tx mbps | Tx pps |
+-------------------+--------------+-------------+--------------+-------------+
ce53 0.00 0 0.00 0
xe6 0.00 0 2960.63 246719
xe8 0.00 0 0.00 0
xe9 0.00 0 0.00 0
xe21 2960.63 246719 0.00 0
 
SW1#sh vlan brief
Bridge VLAN ID Name State H/W Status Member ports
(u)-Untagged, (t)-Tagged
======= ======= ================ ======= ========== ==========================
1 1 default ACTIVE Success xe6(u) xe21(u)
1 2 VLAN0002 ACTIVE Success xe6(t) xe21(t)
1 3 VLAN0003 ACTIVE Success xe6(t) xe21(t)
1 4 VLAN0004 ACTIVE Success xe6(t) xe21(t)
1 5 VLAN0005 ACTIVE Success xe6(t) xe21(t)
1 6 VLAN0006 ACTIVE Success xe6(t) xe21(t)
1 7 VLAN0007 ACTIVE Success xe6(t) xe21(t)
1 8 VLAN0008 ACTIVE Success xe6(t) xe21(t)
1 9 VLAN0009 ACTIVE Success xe6(t) xe21(t)
1 10 VLAN0010 ACTIVE Success xe6(t) xe21(t)
 
Configuring acceptable-frame-type vlan-tagged on ingress interface
SW1
SW1(config)#interface xe21
Enter interface configuration mode for xe21
SW1(config-if)# switchport mode hybrid acceptable-frame-type vlan-tagged
Configure acceptable-frame-type vlan-tagged
SW1(config-if)#exit
Exit from interface mode
SW1(config)#commit
Commit the candidate configuration to the running configuration
 
Validation
After configuring acceptable-frame-type vlan-tagged, In the show bridge o/p we can see that un-tagged traffic is dropped (.0003 mac entry is not present), and traffic also getting dropped for that specific stream.
Now on show vlan brief output we can see that xe21 interface is having port type as tagged (t).
SW1#sh show bridge
bridge 1 is running on rstp vlan-bridge
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 5 xe21 0010.9400.0003 1 300
1 6 xe21 0010.9400.0004 1 300
SW1#sh int counters rate mbps
+-------------------+--------------+-------------+--------------+-------------+
| Interface | Rx mbps | Rx pps | Tx mbps | Tx pps |
+-------------------+--------------+-------------+--------------+-------------+
ce53 0.00 0 0.00 0
xe6 0.00 0 1971.13 164480
xe8 0.00 0 0.00 0
xe9 0.00 0 0.00 0
xe21 2960.64 246720 0.00 0
 
SW1#sh vlan brief
Bridge VLAN ID Name State H/W Status Member ports
(u)-Untagged, (t)-Tagged
======= ======= ================ ======= ========== ==========================
1 1 default ACTIVE Success xe6(u) xe21(t)
1 2 VLAN0002 ACTIVE Success xe6(t) xe21(t)
1 3 VLAN0003 ACTIVE Success xe6(t) xe21(t)
1 4 VLAN0004 ACTIVE Success xe6(t) xe21(t)
1 5 VLAN0005 ACTIVE Success xe6(t) xe21(t)
1 6 VLAN0006 ACTIVE Success xe6(t) xe21(t)
1 7 VLAN0007 ACTIVE Success xe6(t) xe21(t)
1 8 VLAN0008 ACTIVE Success xe6(t) xe21(t)
1 9 VLAN0009 ACTIVE Success xe6(t) xe21(t)
1 10 VLAN0010 ACTIVE Success xe6(t) xe21(t)