Redback rails against Cisco edge router

Redback Networks is taking shots at Cisco's 7600 edge router

Redback Networks is taking shots at Cisco's 7600 edge router, just when the 6-year-old product is ready to become a more direct competitor to Redback's offerings.

Cisco this week is announcing broadband remote access server (B-RAS) capabilities for the 7600 that will ship on the platform in the first quarter of 2007. B-RAS is being added to aggregate video traffic and is one feature intended to make the 7600 into a more converged, multi-application edge router for voice, video and data.

Yet Redback, a leading provider of edge routers for broadband services and subscriber management, says Cisco's plan is a tall order.

"To deliver triple-play services, Cisco still uses three operating systems and three different network routers to deliver broadband, phone and TV services," Doug Wills, Redback director of corporate communications, charged in an e-mail to Network World. "Single-service broadband routers are a little out-of-date in today's multi-service, multi-access world. It's a little like buying three computers today, then dedicating each PC to a single application such as word, power point and excel. Put another way, if Cisco were Starbucks, the San Jose company would figure out a way to sell you three different coffee machines to make you a single latte."

Specifically, Redback claims the many iterations of the 7600 over the past six to 10 years have rendered the router a kluge for carrier-class triple play applications. The router's switch fabric employs centralized forwarding susceptible to head-of-line blocking; and its distributed forwarding option is expensive to deploy, Redback charges.

The 7600's multiple generations and versions of line cards and IOS software releases force service providers into mixing and matching the appropriate line cards, supervisor engines and IOS feature sets to attain the desired function and performance -- such as B-RAS and Ethernet switching and multicast switching -- Redback charges.

And the router's new B-RAS capabilities -- housed in a portless module called the Multiprocessor WAN Application Module (MWAM), which Cisco now calls the Intelligent Services Gateway -- are inherited from Cisco's decommissioned 6400 series Broadband Aggregators, Redback claims. MWAM supports only 3Gbps and 16,000 sessions per blade, meaning three will have to occupy a 7600 chassis in order to achieve the 64,000 session maximum Cisco touts for the router. That means there are three less slots for external ports, according to Redback.

Moreover, the MWAM saps the performance of the 7600's Supervisor 720 route engine, and Gigabit Ethernet and 10G Ethernet modules because it forces the Supervisor 720 to default to a previous generation throughput of 16Gbps per slot instead of the 40Gbps per slot it is designed to offer, Redback claims.

Lastly, "the MWAM card on the 7600 uses a separate IOS than the rest of the 7600," says Ravi Medikonda, Redback's director of product marketing.

All this is the result of a 10-year-old router originally designed for the enterprise, Redback claims. Even though the 7600 was introduced in February 2001, the router had its roots in the enterprise market long before it debuted as a service provider platform a little less than six years ago, according to Redback.

The 7600 never gained any meaningful traction with large service providers because ofits initial enterprise focus -- and lack of carrier-class capabilities, Redback charges.

"Among Top 20 DSL providers worldwide, Cisco's 7600 routers are not deployed at the edge of any carrier network, where broadband, phone and TV services are delivered," the Wills e-mail claims.

Well, that might be because the 7600 is targeted predominantly at Metro Ethernet service delivery, not broadband aggregation -- until early next year. For broadband aggregation, Cisco offers the aging 10000 series routers.

Cisco is also working on a next-generation edge router that will combine multiservice, B-RAS and Ethernet edge applications. Redback expects this router to appear in 18 months and be based on the lower-end eight- and four-slot CRS-1s Cisco's unveiled over the past two years.

Cisco is increasingly adding more edge capabilities to the CRS-1's IOS XR operating system. Redback claims Cisco is falling back on the CRS-1 as its converged edge router -- while the 7600 takes on more edge functionality in the short term -- because an internal effort to consolidate its six or so edge routers onto two or three platforms based on technology obtained from the acquisition of start-up BCN Systems two years ago failed.

"The indication that we have from sources, [Cisco] is also planning to shelve an internal next-generation B-RAS project called the BCN," Medikonda says. "They are shelving that project because of the issue of too many edge router product lines within Cisco. The internals of the BCN B-RAS software will be integrated into the 7600.

"Essentially, this will be a replica of a two operating system box very similar to the 6400 that they released in early 2000, that was literally a failure with service providers," Medikonda says.

Perhaps, but is that also the case with the 7600? Cisco says it has sold more than 30,000 units of the 7600 to carriers around the world, including AT&T, BellSouth, Vodafone and VSNL.

And Dell'Oro Group states that Cisco achieved record sales of the 7600 in the third quarter of this year.

Is Redback's rant just sour grapes from a company facing a formidable new -- or reworked -- B-RAS threat after sales of its own SmartEdge routers, according to Dell'Oro, slipped in the third quarterfor the second quarter in a row?

Hardly, company officials say.

"Redback's growing 80-plus (percent) year-over-year," Wills says. "Is Cisco's edge business growing that fast?"

Cisco declined to comment on the Redback claims.

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