vlan ID can go from 1 to 4094 (if you use extended vlan) so combining second and third octets will not work anyway. I don't think there is a best way for it neither their is a norm. If you want it consistent then use: vlan 1 = 10.140.1.0/24 (oh no wait don't use vlan 1) vlan 2 = 10.140.2.0 /24. vlan 3 = 10.140.3.0 /24 . and so on.

VLAN is a part of Layer 2 header, as soon as packet crosses the Layer 3 boundry the layer 2 header is stripped off and replaced by other layer 2 header. Like you said that you have 6500 switch working as a L3 switch in both building. So using same VLAN ID doesnt matter here.

The native VLAN on a trunk link is the VLAN that will carry untagged traffic. However, the other VLANs that will be passing over that trunk link will be carried out with their VLAN ID tag. The native VLAN must match on both ends of the trunk link.

Use the encapsulation dot1q command in subinterface range configuration mode to apply a VLAN ID to the subinterface. In your router interface configuration: interface GigabitEthernet0/1.633. bandwidth 2048. encapsulation dot1Q 633 . Here, You …

You use VLAN 2 on a routed port, so it is normal you cannot create this VLAN: VLAN Usage---- -----2 GigabitEthernet1/19.2 . A solution would be to make Gi1/19 a trunk port and create a SVI for VLAN2 . Best rgds, Jerome

both PCs belong to VLAN 20 after the command switchport access vlan 20, under interface fa 0/1 in the two switches. I have configured the g 0/1 interface to trunk at the two switches. the show interfaces trunk command verifies that g 0/1 is trunking. When I issue the command show vlan id 20, the output only mentions fa 0/1 as member of the VLAN.

This just means that if a frame comes in on a SWITCH port that has no VLAN tag or the VLAN ID is empty the switch will assume it belongs to the default VLAN configured on the port. So if you have an access port that is part of VLAN 10 and it receives an untagged frame that frame will be associated with VLAN 10 inside the switch.

Let’s take an example, let’s assume the attacker has successfully negotiated a trunk connection with switch A, and the attacker wants to send malicious traffic to the target machine located in VLAN50 which has the MAC address of aaaa.bbbb.cccc. The attacker would inject VLAN ID 50 into the 802.1q tag and send it to the switch.

"If an 802.1Q trunk port receives a tagged frame with the VLAN ID the same as the native VLAN, it drops the frame. Consequently, when configuring a switch port on a Cisco switch, configure devices so that they do not send tagged frames on the native VLAN." 3. Please refer to the following documents - "Section 3: Situation 3: Caveat"

2024年2月26日 · Dynamic VLAN - LIke MAC-based, dynamic VLANs do not have a specific VLAN ID range assigned. Instead, VLAN membership is dynamically assigned by a VMPS (VLAN Membership Policy Server) based on the MAC address or user authentication. Private VLAN (PVLAN) - PVLAN use a combination of primary and secondary VLANs. The primary VLAN is …