Information Note: Redundant Connection between PRP Network and RSTP Network through HSR Ring

An HSR ring can be connected to a PRP network with zero-time failover redundancy through HSR-PRP coupling, and an HSR ring can also have a dual connection to an RSTP network for RSTP-timed failover redundancy through HSR Mode R.

This makes it possible to connect a PRP network at two locations to an RSTP network through an HSR ring, and therefore, providing a redundant connection between the PRP and RSTP networks.

Figure 1. Same NetId on the HSR-PRP-A and HSR-PRP-B switches


For redundancy, the top two RedBoxes need to be on different device(s) than the bottom two RedBoxes to ensure the redundant connection even with a power failure. This kind of configuration can be set up on the Raptor and/or MicroRaptor as in the following example.



VLANs used:
  1. Default switch RSTP network
  2. PRP LAN A
  3. PRP LAN B
  4. Connecting test PRP switch to outside world

A Raptor configuration script (version 1.14.10 and above) is as follows.

configure terminal
sub-switch vlan 2 gi 0/10-16,0/19
sub-switch vlan 4 gi 0/9 ex 0/1
interface redundant 5
shut
mode hsr
hsr-operational-mode moder netid 1
no shut
exit
interface redundant 6
shut
mode hsr-prp-a netid 3
no shut
exit
interface redundant 7
shut
mode prp
no shut
exit
exit

A MicroRaptor configuration script (version 1.14.10 and above) is as follows.

configure terminal
sub-switch vlan 3 gi 0/5-8,0/11
interface redundant 3
shut
mode hsr
hsr-operational-mode moder netid 1
no shut
exit
interface redundant 4
shut
mode hsr-prp-b netid 3
no shut
exit
exit