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Tommetje

Service Instances

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Yesterday I had to configure a 4451-X router with built-in L2/L3 switch. Apparently they are completely different from the old routers with NM switch modules (those you can also insert into GNS3 routers). These new service modules (SM-X-ES3-24-P) are completely indepent 3560 switches that you can insert into a router.

 

Anyway, in order to connect the router to the built-in switch, you need to configure an internal Ethernet interface on the router. You can't configure it as a trunk or using subinterfaces. You need to configure Service Instances on the interface and Bridge Domain Interfaces (BDI).

 

I found the below articles very useful in order to understand this new (to me) concept.

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