RE: Significance of Native Vlan

Native vlan is used to carry untagged packets. When you create a vlan the
number of the vlan becomes the tag and it travels with the packets from
switch to switch. By default on most vendor switches vlan 1 is the native
vlan. You can make the native vlan anything you want but you must have this
configuration "SWITCHPORT TRUNK NATIVE VLAN (VLAN NUMBER)" on your trunk
ports for untagged packets to be carried.

Spanning tree umm! That will require some reading on your part but simply
put spanning tree is a layer two technology used to prevent loops around the
network. There are different types /modes. Depending on the type of
spanning tree you have implemented that will determine if you have a
"blocked port" or "alternate port" status. Either ways you can still
disable spanning tree on a port (caveat this might prevent loops from being
detected on your network). "spanning portfast" can do this on an access
port. You can also disable it on a trunkport with the spanning tree point
to point configuration.

Spanning tree implementation requires planning on your part and knowing your
network topology well.

-----Original Message-----
From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of S
Malik
Sent: Saturday, November 21, 2009 6:46 AM
To: Cisco certification
Subject: Significance of Native Vlan

All,
If two switches configured for "switchport mode trunk" & " sw trunk encap
dot1q" and spanning is disabled on one end of the trunk, then what is the
significance of Native Vlan?

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Received on Sat Nov 21 2009 - 07:55:03 ART