We bought a second CRS with the purpose of redundancy and want to link the two CRS together with QSFP+ cable(s). I don't see any problems there. For the CCR we want to use the 2nd SFP+ port to the 2nd CRS. AFAIK bonding is only for when using multiple cables between the same device and not for this setup.
The question is if I should add vlan interfaces on the 2nd sfp+ port as well and create a bridge for each vlan and add both vlan interfaces to that bridge - or - should I bridge the physical ports together and add vlan interfaces on that bridge. I have no clue if that works, but I did notice ROS does allow me to do /interface vlan add interface=testbridge name=vlan1 vlan-id=1
So
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/interface vlan add interface=sfp-sfpplus1 vlan-id=1 name=sfp1vlan1
/interface vlan add interface=sfp-sfpplus2 vlan-id=1 name=sfp2vlan1
/interface bridge add name=bridge-vlan1
/interface bridge port add bridge=bridge-vlan1 interface=sfp1vlan1
/interface bridge port add bridge=bridge-vlan1 interface=sfp2vlan1
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/interface bridge add name=bridge-sfp
/interface bridge port add bridge=bridge-sfp interface=sfp-sfpplus1
/interface bridge port add bridge=bridge-sfp interface=sfp-sfpplus2
/interface vlan add interface=bridge-sfp vlan-id=1 name=vlan1