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is L2TPv3 right for me?

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cchurc05 at harris

Oct 31, 2009, 10:52 AM

Post #1 of 3 (468 views)
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is L2TPv3 right for me?

Hey all,

Have a data center migration project (old building to new) where I require the temporary extension of VLANs from the old building to the new one. The interconnection between the buildings will be Type 1 encryptors back to back via dark fiber (Ethernet), which only do IP (can't function as Layer 2 or support MPLS). I'm thinking L2TPv3 is what I need, where I can bridge between 5 and 20 VLANs across the link, and route other traffic that doesn't need to be bridged across. I'm told the Taclanes will support large frames, so that the L2TP and IP headers don't create fragmentation for the normal 1500 byte Ethernet frames. I'm assuming with L2TP, normal bridging things work (L2 forwarding table built, unknown mac destinations are sent across, etc)...
The link provided will be gigabit, but with encryption overhead, probably need at most 900 mbit throughput, mostly using full-size frames as traffic will be mostly migration data. I've got a couple 7206s available with NPE-G1. I'm thinking that will work. Any thoughts?

Thanks,

Chuck

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cisco-nsp at ml

Nov 1, 2009, 12:16 PM

Post #2 of 3 (425 views)
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Re: is L2TPv3 right for me? [In reply to]

* Church, Charles <cchurc05 [at] harris> [2009-10-31 18:59]:
> Hey all,
>
> destinations are sent across, etc)... The link provided will
> be gigabit, but with encryption overhead, probably need at
> most 900 mbit throughput, mostly using full-size frames as
> traffic will be mostly migration data. I've got a couple
> 7206s available with NPE-G1. I'm thinking that will work.
> Any thoughts?

I don't have numbers at the moment but IRRC NPE-G1 can't handle
anything near 900MBit/s of L2TPv3 traffic..

Regards,

Sebastian

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yanf787 at yahoo

Nov 2, 2009, 4:58 AM

Post #3 of 3 (441 views)
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Re: is L2TPv3 right for me? [In reply to]

I would agree with that and I was testing it some time ago and tests involved ISRs, 7206-G1 and 10720 and 10720 was the only device that could do this and even Cisco was surprised. L2TPv3 is not supported in hardware of most devices and in case of 10720 it just had enough processing power. With larger frames, the throughput would increase as, there would less packets to encapsulate, but I never saw with 1400 byte frames anything that went beyond 100 Mbps. EoMPLS might be a better choice (still not sure about G1) and they might just bring L2TPv3 to ASR one day, if they unless they already did.

________________________________
From: Sebastian Wiesinger <cisco-nsp [at] ml>
To: cisco-nsp [at] puck
Sent: Sun, November 1, 2009 3:16:09 PM
Subject: Re: [c-nsp] is L2TPv3 right for me?

* Church, Charles <cchurc05 [at] harris> [2009-10-31 18:59]:
> Hey all,
>
> destinations are sent across, etc)... The link provided will
> be gigabit, but with encryption overhead, probably need at
> most 900 mbit throughput, mostly using full-size frames as
> traffic will be mostly migration data. I've got a couple
> 7206s available with NPE-G1. I'm thinking that will work.
> Any thoughts?

I don't have numbers at the moment but IRRC NPE-G1 can't handle
anything near 900MBit/s of L2TPv3 traffic..

Regards,

Sebastian

--
New GPG Key: 0x93A0B9CE (F4F6 B1A3 866B 26E9 450A 9D82 58A2 D94A 93A0 B9CE)
Old GPG Key-ID: 0x76B79F20 (0x1B6034F476B79F20)
'Are you Death?' ... IT'S THE SCYTHE, ISN'T IT? PEOPLE ALWAYS NOTICE THE SCYTHE.
-- Terry Pratchett, The Fifth Elephant
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