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Wich 28xx Router?

Hello,

we need a router that supports three fiber optic links (single mode), 1 GBit each. The 2811 seems to be the smallest that supports three HWIC-1GE-SFP. Now what about performance? It is fast enough, provided that it does nothing more than simple static routing? Would a 2821 or even a 2851 be better?

Regards, Christoph Gartmann

Reply to
Christoph Gartmann
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In article , Christoph Gartmann wrote: :we need a router that supports three fiber optic links (single mode), 1 GBit :each. The 2811 seems to be the smallest that supports three HWIC-1GE-SFP. :Now what about performance? It is fast enough, provided that it does nothing :more than simple static routing? Would a 2821 or even a 2851 be better?

None of the 28xx are suitable for sustaining gigabit.

formatting link
The 2851 peaks at 112.64 megabits per second of 64 byte packets,

220K pps. In theory that would be 2.7 Gbps and yet the 28xx routers are marketed in terms of low multiples of T1 (2, 3, 5), and the Gardner Reports measured throughputs compatible with sustained T1.

If your packets average (say) 600 bytes including trailers and intrapacket gap, then in order to keep 3 unidirectional gigabit links going, you would need a performance of 625,000 packets per second . The closet you can get to that is:

3845 - 500,000 pps 7200-NPE-G1 - 1,018,000 pps 7304-NPE-G100 - 1,099,000 pps 7301 - 1,018,000 pps 7500-RSP16 - 530,000 pps

If you need only "simple static routing" then you might want to look into Cisco's Catalyst Switch line, the 3550, 3750 (and their kin), and the 4000/6000/6500 families. 3 gigabits would barely keep the fan running on a 3550 or 3750 "Multilayer switches".

Reply to
Walter Roberson

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