Simple bridging on MX
I’m doing some studying using Junosphere at the moment, but unfortunately Junosphere can’t emulate a LAN at the moment. Basically the same problem that GNS3 has and (as far as I know) Cisco’s VIRL/CML has as well. So you’ve got to bodge it with Integrated Routing and Bridging (IRB). What I needed topology-wise was this:
LAN segment between S1, R1 and R2
I find Junos a bit counter-intuitive when creating bridge domains. Here I need something quite simple – two ports in a bridge group (no VLANs or anything), but I need to give a VLAN tag value to identify the bridge domain.
Anyway, the process for doing this is as follows:
1. Give the physical interfaces the right encapsulation type – ethernet-bridge
2. Create a bridge domain which has a VLAN-ID and references these two interfaces
3. Create an IRB interface (irb.10) with family inet and an IP address on it
4. In the bridge domain, use “routing-interface irb.10″ to tie the bridge domain and the IP interfaces together.
The result is this:
IRB solution for LAN
The configuration I used was this:
root@S1# show interfaces
ge-0/0/0 {
description "to R1 0/0/1";
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