2811 or 2821

Answered Question
Jun 15th, 2009
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I am upgrading a 5 user remote site from stand alone DSL to T1 P-to_P to regional HQ. I am deciding between a 2811 w/a Switch or a 2821 with a T1 module and Ethernet modules. I'd like to know which way to go, esp. cost wise and parts# needed. Thnx a mil.

Correct Answer by Joseph W. Doherty about 8 years 1 week ago

If you're forced to chose between the 2811 vs. 2821, not a huge difference in performance. The 2821 offers about 41% more forwarding performance, but in absolute terms it's 170 Kpps vs 120 Kpps (64 byte packets). I.e., either could be inadequate for even a single 100 Mbps, although fine for a couple or several T1s.


The 2821 does come with gig Ethernet interface, again not very useful with its low forwarding performance, but it also supports a NME-X module.


If money isn't an object, go with the 2821 to have a bit more capacity. If money is tight, go with the 2811 unless you know for sure you need the 2821.

Correct Answer by paolo bevilacqua about 8 years 1 week ago

You can get a 1861, does voip/CME/SRTS and all the stuff plus it has 8 nice PoE ports.


Sometime you may want to be the one that shows others how to spend money wisely.

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paolo bevilacqua Mon, 06/15/2009 - 10:49
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Honest with you, a 1841 is enough for T1.

mrcooper1 Mon, 06/15/2009 - 11:04
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agreed, but these sites are being set up with the hope of going to VoIP in the near future without necessarily having to replace the entire hardware. I figured I can get the proper IOS in and wait for whenever VoIP rolls around. Also, the enterprise is standardised on 2811/2821 and above depending on size.

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paolo bevilacqua Mon, 06/15/2009 - 11:08
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You can get a 1861, does voip/CME/SRTS and all the stuff plus it has 8 nice PoE ports.


Sometime you may want to be the one that shows others how to spend money wisely.

mrcooper1 Mon, 06/15/2009 - 12:40
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Paolo. I think that will do it. For the goal, a 2811 is a bit much. thnx all.

paolo bevilacqua Mon, 06/15/2009 - 13:22
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Joseph W. Doherty Mon, 06/15/2009 - 12:47
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If you're forced to chose between the 2811 vs. 2821, not a huge difference in performance. The 2821 offers about 41% more forwarding performance, but in absolute terms it's 170 Kpps vs 120 Kpps (64 byte packets). I.e., either could be inadequate for even a single 100 Mbps, although fine for a couple or several T1s.


The 2821 does come with gig Ethernet interface, again not very useful with its low forwarding performance, but it also supports a NME-X module.


If money isn't an object, go with the 2821 to have a bit more capacity. If money is tight, go with the 2811 unless you know for sure you need the 2821.

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