How to do it depends on what you are trying to achieve and you have not given us enough details to know what you are trying to accomplish that needs bridging on your 1841.
In the most simple situation where you have some non-IP protocol that you want to bridge you would start by creating a bridge group with the command:
bridge 1 protocol ieee
and then you enable bridging on the interfaces with the command:
If you want to bridge IP then it becomes more complicated. If you want to bridge IP on every interface you would use the commands I gave above and also this command to disable IP routing and enable bridging of IP:
no ip routing
If you want to route IP on some interfaces and bridge IP on other interfaces then you need to configure Integrated Routing and Bridging.
So if you clarify what it is that you are trying to accomplish then we can give better advice.
I don't mean to intrude on this topic. But I think the author and I are may be looking for the same thing. Here's my tread below. But basically, I am looking to connect two locations using two different routers to use the same subnets, such as 192.168.1.x at both locations. Can IRB do that ?
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