What does interface VLAN 1 mean?

Description. VLAN 1 is a special VLAN that tags and handles most of the control plane traffic such as Spanning-Tree Protocol (STP), Cisco Discovery Protocol (CDP), Dynamic Trunking Protocol (DTP), VLAN Trunking Protocol (VTP), and Port Aggregation Protocol (PAgP) all VLAN 1 tagged traffic.

What is VLAN 1 on a Cisco router?

VLAN 1 contains control plane traffic and can contain user traffic. It is recommended that user traffic be configured on VLANs other than VLAN 1, primarily to prevent unnecessary user broadcast and multicast traffic from being processed by the Network Management Processor (NMP) of the supervisor.

Should VLAN 1 be used?

Therefore, with regard to VLAN 1, the above rule simply translates into the recommendations to: Not use VLAN 1 for inband management traffic and pick a different, specially dedicated VLAN that keeps management traffic separate from user data and protocol traffic.

Why would you configure VLAN 1 on the switch?

By default, all ports on the switch are VLAN 1. With all ports in VLAN 1, all ports can communicate. As soon as you change the VLAN assignment for a switch port to another VLAN, that switch port won’t be able to communicate with the rest of the devices on other ports.

Is VLAN 1 reserved?

Furthermore, VLAN 1 is reserved for “untagged traffic,” meaning that any data traffic in a network that does not have a VLAN tag is considered to be on VLAN 1. This is why all switch and access point VLANs are defaulted to VLAN 1.

Why should you avoid using VLAN 1?

If we leave the default native VLAN as 1, then a malicious developer could exploit this to gain access to another segment. This is accomplished by using a software package to double-tag an Ethernet packet with two separate VLAN ID headers.

Why is VLAN 1 a security risk?

VLAN 1 is the only VLAN that exists, so this means that all ports are members of VLAN 1 by default. The native VLAN can be a security risk. It isn’t tagged by default. If an access port is set to the same VLAN as the attackers, VLAN hopping is much more easily accomplished from the default VLAN.

What is difference between interface and VLAN?

It sounds like what you’re asking is about the concept of switched virtual interfaces – “interface vlan 10”, for instance, is a switched virtual interface. This is different than a VLAN in that a VLAN is a logical network segment, a broadcast domain, whereas an SVI is a logical interface.

What is an interface on a switch?

Switch interfaces are an access aid used to connect a special needs switch or similar device to a computer. In many cases, a standard switch 3.5mm jack cannot plug directly into a computer.

Is there an IP address assigned to VLAN 1?

VLAN 1 has a static IP address, while VLAN 2 has a dynamic IP address assigned via DHCP or PPPoE from the uplink device. You can enable the DHCP/PPPoE client multiple uplink VLAN interfaces (up to four) on the managed device; these VLANs cannot be VLAN 1.

Is VLAN 1 the management interface?

VLAN 1 serves as the management VLAN if you did not specifically define another VLAN. You assign the management VLAN an IP address and subnet mask. A switch can be managed via HTTP, Telnet, SSH, or SNMP.

Is VLAN 1 tagged?

In FTOS VLAN 1 is the default VLAN and is untagged on all ports. The default VLAN cannot be tagged on any interface in FTOS platform. In order to change the default VLAN ID on the switch to any VLAN ID from 1-4094 it should not be present in the VLAN database of the switch.

How many interfaces the switch have?

three types
Generally three types of interfaces are provided to manage a Network switch: Simple Network Management Protocol: Also known as SNMP, it is a protocol that facilitates the exchange of management information between network devices.

What is a Layer 3 interface?

Layer 3 interfaces forward packets to another device using static or dynamic routing protocols. You can use Layer 3 interfaces for IP routing and inter-VLAN routing of Layer 2 traffic. Routed Interfaces. You can configure a port as a Layer 2 interface or a Layer 3 interface.