Can I use DSPU over two router connected on the same ethernet segment that through two wan links connects with a central site. Both router have a DLSW peer active with the central site and a backup peer configured to another router at the central site. Do I have any loop problem with this? do I have to configure etherneth redundancy to avoid it? Is DSPU compatible with ethernet redundancy?
I do not fully understand the topology. Let me rephrase it.
You will use the MAC address of ethernet interface of router 1 (MAC1) and 2 (MAC2) for the downstream PUs. In other words, some of the downstream PUs will point to MAC1; while some of the downstream will point to MAC2. As there is no linkage between DSPU (for downstream PUs) and DLSw, you cannot use DLSw ethernet redundancy. As you do not use mac-address to modify the MAC address for the ethernet interfaces, there is no redundancy at all for the downstream PUs.
I wonder if the customer wants redundancy for the downstream PUs. If they do, the only solution I can think of is to use DLUR (SNASw). You use mac-address on ethernet interface to set the ethernet interface on both router the same. Then, you run HSRP. The active HSRP router will pick up all LLC2/DLUR session. Once the active HSRP router goes down, the backup HSRP router will pick up the circuit. I think that THERE MAY BE A CHANCE THAT DSPU may work with HSRP and mac-address. However, I do not think that any one has tried it
If I have well understood with DSPU I cannot have redundancy even by configuring the same mac-address on both ethernet. I don't understand why I have to configure the same mac-address even with HSRP while there is already one used by both routers.
If you use HSRP and SNASw, only the active HSRP router will handle all DLUR session for the downstream PUs. I have never tried HSRP and DSPU. If the same concept works, you will have redundancy. i.e. the active HSRP router will handle all DSPU sessions. Of course, the LUs on downstream PUs will have different LUs on different routers.
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