Why it is a best practice to change the default VLAN 1 to a different VLAN number?
It is also a good practice to shut down unused switch ports to prevent unauthorized access . A good security practice is to separate management and user data traffic. The management VLAN, which is VLAN 1 by default should be changed to a separate distinct VLAN. All control traffic is send on VLAN 1.
Are all switch ports assigned to VLAN 1 by default?
VLANs are assigned to individual switch ports. Ports can be statically assigned to a single VLAN or dynamically assigned to a single VLAN. Ports are active only if they are assigned to VLANs that exist on the switch….Configuring Dynamic VLANs.
| COS | set vmps state enable |
|---|---|
| IOS | N/A |
How are STP BPDUs sent on a Cisco switch?
There are some small changes in how a Cisco switch will send STP BPDUs depending on the native vlan on a trunk. This is described in this document: VLAN 1 STP BPDUs are sent to the IEEE STP MAC address (0180.c200.0000), untagged.
Can a Cisco switch transmit BPDUs on a MAC address?
No other VLAN, including a renumbered native VLAN, will transmit BPDUs on the open standard MAC address. In other words, it is only on VLAN 1 that a Cisco switch will transmit STP BPDUs on the IEEE MAC (0180.c200.0000) to create that CST.
Which is the default VLAN for a switch port?
All switch ports, are configured by default to be members of VLAN 1. All trunks carry VLAN 1 by default. The native VLAN is the VLAN to which a port returns when it is not trunking. Also, the native VLAN is the untagged VLAN on an IEEE 802.1Q trunk. CDP, VTP, and PAgP updates are always forwarded on trunks with a VLAN 1 tag.
How is BPDU transmitted with native VLAN for PVST?
Windows drivers almost always strip off any VLAN tags and pass the frames to Wireshark untagged. Some drivers can be configured (usually through Registry settings) to keep the VLAN tags in frames so that the Wireshark can see them, but it is not supported universally.