Expansion port for UC540

[Volzhenin Dmitriy]

     Why is expansion port for UC540? How does it differ from the WAN port? Is it possible to use the expansion port on the role of WAN port?

[paolo bevilacqua]

That port is used to connect your switches.

With the appropriate configuration, you can use it for anything.

[Volzhenin Dmitriy]

This means that the expansion port - a port of the 3rd level and supports

subinterface? Can WAN port to support subinterface?

[paolo bevilacqua]

No it's purely a layer 2 itnerface. So you do layer 3 config using VLAN interface..

Instread, the wan port support subinterfaces being a layer3 interface.

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[Volzhenin Dmitriy]

Thank you for your help

Tell me where you can read about these features. Or is it just personal experience?

[paolo bevilacqua]

On cisco.com, search "configuiring vlan" for routers that have a switch module, eg 870, ISR with ESW switch module, and many others.

Thanks for the nice rating and good luck!