Native VLAN


When configuring [Native VLAN](/native-vlan)s on a switch [trunk](/switchport-trunk) interface, traffic flow over that trunk port will not be possible by default.  Consider the following topology:

![native-vlan-example-topology.png](/attachments/native-vlan-example-topology.png)

Hosts H1 and H2 on [VLAN](/vlan) 10 will be able to communicate with each other since VLAN 10 is allowed on the trunk.  However, hosts H3 and H4 will not be able to communicate with each other, even though they are configured on the native VLAN 99 and the native VLAN is configured on the trunk.

In order for those hosts to communicate, you must allow VLAN 99 on the trunk, and if you do so, their communication will take place using [untagged frames](/native-vlans-and-untagged-frames).

## Links

https://forum.networklessons.com/t/802-1q-native-vlan-on-cisco-ios-switch/1082/107?u=lagapidis

https://networklessons.com/switching/802-1q-native-vlan-cisco-ios-switch


Native VLAN Traffic Flow on Trunk Ports

Multicast PIM with multiple RPs

Multicast PIM with multiple mapping-agents

Multicast PIM-assert forwarder election

Multicast SPT and RPT

Multicast bidirectional PIM advantages

Multicast boundary filtering - filter auto RP

Multicast enabling Bidir in BSR mode

Multicast ip pim autorp listener

Multicast ip pim rp-address override

Multicast load splitting across equal-cost paths

Multicast local subnetwork address range

Multicast mapping IP to MAC addresses

Multicast mapping agent IGMP membership report

Multicast ping on a Nexus device

Multicast using Anycast RP with Auto-RP and BSR

Multicast

NAT - Translation Table

NAT - Twice NAT

NAT - Understanding debug nat detailed output

NAT - Virtual Interface (NVI)

NAT - What is Policy NAT

NAT - add-route keyword

NAT - ip nat inside destination

NAT - ports used for translation

NAT - show NAT translations

NAT - translate address not directly connected to edge device

NAT Extendable on Cisco IOS

NAT Order of Operation

NAT address naming conventions

NAT and IPv6

NAT how port numbers are chosen when using PAT

NAT intra-VRF NAT

NAT port forwarding - specifying outside IP address

NAT prefix-length keyword on nat pool command

NAT vrf-aware

NBAR classifies only established sessions

NETCONF

NHRP - Authentication

NHRP - Destination Protocol Address

NHRP - Holding Time

NHRP - resolution redirect from hub

NHRP show ip nhrp flags

NHRP

NIC Promiscuous Mode

NTP - securing with MD5 authentication and a Windows NTP server

NTP poll interval

NTP server and client and the master command

NTP troubleshooting and debugging tools

NTP versions 3 and 4

Native VLANs and untagged frames

NetFlow - Flexible NetFlow

NetFlow - Flow Samplers

NetFlow - applying to an SVI

NetFlow - what is a flow

NetFlow local cache size

NetFlow

Network - BUM Traffic

Network - Discontiguous or Discontinuous

Network - Discontiguous

Network - Example of communication, encapsulation, and decapsulation, between hosts

Network - Flapping

Network - Layer 3 network

Network - Monitoring multiple IPs of a single device with Observium

Network - Observium vs LibreNMS

Network - Simultaneous network traffic handling

Network - Transient traffic

Network - Two Way Active Measurement Protocol (TWAMP)

Network - broadcast domain

Network - control plane

Network - data plane

Network Address Translation (NAT)

Network Collisions

Network Design - Choosing a technology for multiple datacenter topology

Network Design - Load Balancing vs Load Sharing

Network Design - Spine and leaf architecture

Network Design - Switch oversubscription ratios

Network Design - Traffic Engineering

Network Design - on-premises and off-premises

Network Design Achieving Redundancy with PE Devices

Network Design Considerations Involving PE and P Routers

Network Time Protocol (NTP)

Network design - confine VLANs to as few access switches as possible

Network planes

Networking - Understanding Chassis devices

Networking - what is a socket

Networks - Overlay Network

Networks - Overlay Transport Virtualization (OTV)

Networks - Spanning Layer 2 networks across remote sites

Networks - Underlay Network

Next Generation Multicast Virtual Private Network (NG-MVPN)

Next Hop

Nexus - using vPC with HSRP

Nexus - what is vPC

Nexus lacp rate fast

Nexus

OSI Model

OSPF - A comparison with IS-IS

OSPF - ABR has at least one interface in Area 0

Native VLAN Traffic Flow on Trunk Ports

Links

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