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Routed port on Layer 3 switch ?? please help

VTP, Portfast, Spanning Tree and all the other switch related stuff.

Re:Routed port on Layer 3 switch ?? please help

Postby Guest » Fri Dec 31, 2010 11:05 am

Hello Tim,

the option of using a routed port can be helpful in some scenarios where you want to be sure that if that port goes down the L3 interface goes down too.

 

When we use L2 Vlans and their L3 associated objects SVI interfaces there is a mechanism called autostate:

the SVI is considered up/up if at least one L2 port is operational and in STP forwarding state.

 

So using an SVI can lead to an undesired behavior in some cases because also L2 trunks count for that check and it is enough to have the vlan permitted and in STP forwarding state to have the SVI up/up.

 

Another benefit of using routed ports is that on them STP is not running and so routing  convergence depends only from routing protocol capabilities and no STP is involved

 

Hope to help

Giuseppe

Guest
 

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Re:Routed port on Layer 3 switch ?? please help

Postby Guest » Fri Dec 31, 2010 11:11 am

Hello everyone

 

I am confuse about the routed port on layer 3 switch , Can someone please help me out why we have to configure routed port on the layer 3 switch .

As we all know that layer 3 switch can do VLAN routing then we need to configure routed port on the layer 3 switch and connect router on that port

what is purpose of confgureing routed port , I am totally confuse about the concept of routed port

 

please help me out

 

Thanks

 

Hi,

 

Routed port by defination is a physical port that acts like a port on a router. A routed port is not associated with a particular VLAN, and it behaves like a regular router interface. You can configure a routed port with a Layer 3 routing protocol.A routed port is useful if you want to IP terminate something on the

switch and not get the traffic on that port mixed in with other L2 traffic.

 

Hope to Help !!

 

Remember to rate the helpful post

 

Ganesh.H

Guest
 

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