It does work for me. I set it up so that one HARC owns all the cards and they are statically set. The backup is set to owner=no for all slots, but is dynamic. If the first HARC fails, the second one then comes in (not immediately, but it does come in) when the NMC notices the first one is gone and dynamically assigns all slots to the second one. Under normal operation, the second one is just sitting there, and I assign it the same IP pool as the primary HARC in the chassis. I've had this work in my test chassis, in a live controlled experiment where I had to shut down a chassis for other reasons so I pulled the primary HARC first to see if failover would work (it did; then I powered off the chassis), and once in an actual failure. That one was kind of rocky, though; the primary HARC failed, but tried several times to ressurect itself and take back control of the chassis. This didn't work, but was enough to disrupt the chassis several more times. Naturally, this happened while I was on vacation, and at a remote POP, not our Tokyo hub. By the time somebody got out there to remove the failed card, it had bounced up and down several times. It appears that failover will work fine in the even of complete failure, but if a HARC keeps coming up with "I'm not dead yet!" then your customers on that chassis can be in for a rough ride until someone dispatches it. Jonathan Byrne, CCNA Engineering Division <Large Hosting/Colo company with no public opinions> Tel: +81 3-5358-5291 Fax: +81 3-5358-5306 Aaron Nabil (nabil@SpiritOne.com) wrote:
It may not work at all. From the TC4.0 HiperArc release notes...
MR 12602 Issue Dual HiPer ARC Fail-over not working. When using two HiPer ARCs, and one is pulled, the other fails to take ownership of the pulled ARCs HDMs. Status No Workaround currently exists
-- Aaron Nabil
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