For my tests, I connected my protected server through the SM-2601F version SX to two Cisco Systems Catalyst 3524 switches on GBIC ports. I had some odd negotiation problems between one of the switch ports and the SM-2601F, but a bit of switch configuration smoothed it out. The failover process worked as advertised--when I tampered with the primary connection, the backup took over without skipping a beat. I manipulated the physical connection and disabled the switch port in management to induce failover, and the panel alarms and SNMP trap notification went out as expected. After several dozen forced failovers, the only strange result was a single instance of slow link acquisition between the SM-2601F and the switch, but I couldn't duplicate it. Every other time, the primary link took over seamlessly.
Two SM-2601F units can occupy a single rack unit and ensure redundant connectivity. The look of the SM-2601F is understated, with simple push buttons on its face and basic command-line and standard MIB controls that offer pretty neat protection. Automatic failover, local and remote control, failure reporting and configuration flexibility make the SM-2601F worth a look for your important gigabit links.
Lee Badman is a network engineer at Syracuse University. Write to him at [email protected].
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