port types

Created: Feb 19, 2019 13:23:06Latest reply: Feb 19, 2019 21:01:00 125 2 0 0
  Rewarded Hi-coins: 0 (problem resolved)

Hello every one.we have three types of port (1)access (2)trunk (3)hybrid ..

access used with host means untagge traffic will pass on access port and trunk is b/w switches or switch to router tag traffic will pass and we said that hybrid is funtion as both access & trunk but how can any one explian me this..Thanks in advance

  • x
  • convention:

Sergio93  Enthusiast Technician   Created Feb 19, 2019 13:33:58 Helpful(0) Helpful(0)


As you said, a hybrid interface can connect to not only a user terminal (such as a user host or server) or network device (such as a hub or simplified Layer 2 switch) that cannot identify tags, but also a switch, router, voice terminal, or AP that can receive and send tagged and untagged frames. It allows tagged frames from multiple VLANs. Frames sent out from a hybrid interface are tagged or untagged according to the VLAN configuration.  

When the interface receives an untagged frame, it tags the frame with the default VLAN ID. If the default VLAN ID is allowed by the interface, the interface accepts the frame. Otherwise, the interface discards the frame.
When the interface receives a tagged frame, it accepts the frame if the VLAN ID of the frame is in the list of allowed VLAN IDs. Otherwise, the interface discards the frame.
If the VLAN ID of a frame is allowed by the interface, the interface forwards the frame.

After a hybrid interface is added to VLANs in tagged mode, the interface forwards frames without removing VLAN tags of frames.

After a hybrid interface is added to VLANs in untagged mode, the interface removes VLAN tags of frames before sending frames.

Hybrid and trunk interfaces can be interchanged in some scenarios, but hybrid interfaces must be used in specified scenarios, for example, selective QinQ scenario. Before packets from multiple VLANs provided by a service provider enter a user network, the outer VLAN tags must be removed. The trunk interface cannot be used here because the trunk interface allows only untagged packets from the default VLAN of the interface to pass through.
  • x
  • convention:

BEST ANSWER! If you think I earn it!
If this post was useful to you, please click the Helpful button and flag my post as a "BEST ANSWER" so others can benefit. Thank you
LSA     Created Feb 19, 2019 21:01:00 Helpful(0) Helpful(0)

Sergio93 Thanks for explanation but where hybrid port funtions as access port,send untagged packet..and other things that it means that hybrid in untagged mode can also send tagged frame that you said in last sentence.
  • x
  • convention:


You need to log in to reply to the post Login | Register

Notice: To protect the legitimate rights and interests of you, the community, and third parties, do not release content that may bring legal risks to all parties, including but are not limited to the following:
  • Politically sensitive content
  • Content concerning pornography, gambling, and drug abuse
  • Content that may disclose or infringe upon others ' commercial secrets, intellectual properties, including trade marks, copyrights, and patents, and personal privacy
Do not share your account and password with others. All operations performed using your account will be regarded as your own actions and all consequences arising therefrom will be borne by you. For details, see " Privacy."
If the attachment button is not available, update the Adobe Flash Player to the latest version!
Fast reply Scroll to top