Re: SFP vs. SFP+
On 18/02/2011 03:04, Frank Bulk wrote: Are there are any optics that plug into 10G ports but have a copper or optical 1G interface? There's some equipment that I'm specing where it is $10K for a multi-port 1G card, even while I really may only *occasionally* need a single 1G port and there's a free 10G port for me to use. Some of the cisco stuff supports a twingig converter module, One tengig to 2 one gig (and from there a copper or optical SFP) http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps7077/product_data_sheet0900aecd805bbee3.html Vince Frank -Original Message- From: Richard A Steenbergen [mailto:r...@e-gerbil.net] Sent: Thursday, February 17, 2011 7:00 PM To: Jason Lixfeld Cc: nanog@nanog.org Subject: Re: SFP vs. SFP+ On Thu, Feb 17, 2011 at 03:41:28PM -0800, Sam Chesluk wrote: Depends on the switch. Some, like the 2960S and 4948E, have 1G/10G ports. They will, however, not operate at 4Gbps (that particular speed was chosen to allow the core components to work for gigabit Ethernet, OC48, 2G FC, and 4G FC). 4G SFPs are relatively rare, and only for fibre channel. Multi-rate SFPs that do up to 2.5G (for OC48) are a lot more common, but they cost more than just a simple 1GE SFP. Since all you can do with Ethernet is 1G or 10G anyways, most SFPs you'll encounter in the field will be the cheaper non-multirate kind. For more information about SFP+, as well as some comparisons between different 10G optic types, take a look at: http://www.nanog.org/meetings/nanog42/presentations/pluggables.pdf As an update (since this presentation is from Feb 2008), SFP+ is just now finally starting to get into 40km/ER reach territory. Supplies are limited, as they just very recently started shipping, but they do exist. Of course since they moved the electronic dispersion compensation (EDC) off the optic and onto the host board, the exact distances you'll be able to achieve are still based on the quality of the device you're plugging them into. SFP+ is still mostly an enterprise box or high density / short reach offering, and XFP is still required for full functionality.
Re: SFP vs. SFP+
On 18/02/2011 03:04, Frank Bulk wrote: Are there are any optics that plug into 10G ports but have a copper or optical 1G interface? There's some equipment that I'm specing where it is $10K for a multi-port 1G card, even while I really may only *occasionally* need a single 1G port and there's a free 10G port for me to use. Some of the cisco stuff supports a twingig converter module, One tengig to 2 one gig (and from there a copper or optical SFP) http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps7077/product_data_sheet0900aecd805bbee3.html Vince Frank -Original Message- From: Richard A Steenbergen [mailto:r...@e-gerbil.net] Sent: Thursday, February 17, 2011 7:00 PM To: Jason Lixfeld Cc: nanog@nanog.org Subject: Re: SFP vs. SFP+ On Thu, Feb 17, 2011 at 03:41:28PM -0800, Sam Chesluk wrote: Depends on the switch. Some, like the 2960S and 4948E, have 1G/10G ports. They will, however, not operate at 4Gbps (that particular speed was chosen to allow the core components to work for gigabit Ethernet, OC48, 2G FC, and 4G FC). 4G SFPs are relatively rare, and only for fibre channel. Multi-rate SFPs that do up to 2.5G (for OC48) are a lot more common, but they cost more than just a simple 1GE SFP. Since all you can do with Ethernet is 1G or 10G anyways, most SFPs you'll encounter in the field will be the cheaper non-multirate kind. For more information about SFP+, as well as some comparisons between different 10G optic types, take a look at: http://www.nanog.org/meetings/nanog42/presentations/pluggables.pdf As an update (since this presentation is from Feb 2008), SFP+ is just now finally starting to get into 40km/ER reach territory. Supplies are limited, as they just very recently started shipping, but they do exist. Of course since they moved the electronic dispersion compensation (EDC) off the optic and onto the host board, the exact distances you'll be able to achieve are still based on the quality of the device you're plugging them into. SFP+ is still mostly an enterprise box or high density / short reach offering, and XFP is still required for full functionality.
Re: ipv4's last graph
On 02/02/2011 17:22, Matthew Petach wrote: On Wed, Feb 2, 2011 at 9:01 AM, Tony Hain alh-i...@tndh.net wrote: So in the interest of 'second opinions never hurt', and I just can't get my head around APnic sitting at 3 /8's, burning 2.3 /8's in the last 2 months and the idea of a 50% probability that their exhaustion event occurs Aug. 2011, here are a couple other graphs to consider. http://www.tndh.net/~tony/ietf/IPv4-rir-pools.pdf http://www.tndh.net/~tony/ietf/IPv4-rir-pools-zoom.pdf Tony Two things: 1) you'll get better uptake of your graph if it's visible as a simple image, rather than requiring a PDF download. :/ Not wishing to advertise google but http://docs.google.com/viewer?url=http://www.tndh.net/~tony/ietf/IPv4-rir-pools.pdf and http://docs.google.com/viewer?url=http://www.tndh.net/~tony/ietf/IPv4-rir-pools-zoom.pdf works for me without needing to download a pdf viewer Vince 2) labelling the Y axis would help; I'm not sure what the scale of 1-8 represents, unless it's perhaps the number of slices of pizza consumed per staff member per address allocation request? But I do agree with what seems to be your driving message, which is that Geoff could potentially be considered optimistic. ^_^; Matt
Re: IPv6 Space Management. Tracking, not Allocating
On 17/11/2010 17:22, chip wrote: There's been lots of discussion on how we should allocate space to various bits of the network. What I haven't yet seen is how people are tracking these allocations. Is everyone using one of the two or three commercial applications or some OSS solution or a few large(ish) text files? Anyone have any recommendations or feedback? Thanks! --chip I've been playing with HaCi and quite like it http://haci.larsux.de/ Vince
Re: APNIC Allocated 14/8, 223/8 today
On 14/04/2010 13:45, Dave Hart wrote: On Wed, Apr 14, 2010 at 09:20 UTC, Nick Hilliard wrote: On 14/04/2010 08:06, Srinivas Chendi su...@apnic.net wrote to SANOG: 014/8 223/8 Sunny, Please be careful about how you write this. 014 is formally an octal representation, and what you've written there actually means that APNIC has received 12/8 (= octal 014). Nick Nick, My eyebrow raised at the leading zero as well, but I'd call it ambiguous. 0x14 is unambiguously decimal 20, but 014 is only unambiguous in a context that defines leading zero as implying octal. For a C program relying on the runtime to convert text to numeric representation, it depends. sscanf(%d, myint) will convert 014 to decimal 14, %i gets decimal 12. I personally hunt down and kill %i and other octal-assuming code when I see it, except where octal is conventional. To my eyes, 0xFF (or FF) screams all bits lit while 0377 (or 377) only hesitantly clears its throat. Moreover, I assume computers will be used by people who have never had reason to believe a leading zero implies base 8, and I find no joy in forcing them to learn that quirk of computing history. On an up to date OSX install (and Centos linux and FreeBSD) (15:23:17 ~) 0 $ ping 014.0.0.1 PING 014.0.0.1 (12.0.0.1): 56 data bytes Request timeout for icmp_seq 0 From windows 2003 servert C:\Documents and Settings\Administratorping 014.0.0.01 Pinging 12.0.0.1 with 32 bytes of data: wget (on linux and freebsd) (15:26:02 ~) 0 $ wget 014.0.0.1 --2010-04-14 15:26:06-- http://014.0.0.1/ Connecting to 014.0.0.1|12.0.0.1|:80... Oddly on OSX it doesnt take it as octal (15:27:30 ~) 130 $ wget 014.0.0.1 --2010-04-14 15:27:31-- http://014.0.0.1/ Connecting to 014.0.0.1 (014.0.0.1)|14.0.0.1|:80... When it comes to IP addresses, its not history, its important :) Vince Take care, Dave Hart
Re: Drop in IPv6 traffic
Jeroen Wunnink wrote: Same here, we usually do 40-100Mbit of teredo 2001::/32 anycast traffic (a lot of which is news traffic over IPv6 to artrato/XSnews) and that dropped to an all-time low a bit before 0:00 CET. I know XSnews had a free IPv6 news account service, perhaps they closed that ? Assuming that the graph at http://www.xsnews.com/ipv6/ isnt broken for any other reason, you may well be right Vince Marco Hogewoning wrote: On 9 jul 2009, at 12:24, Mikael Lind wrote: Hi, I've seen a big drop in IPv6 traffic volume on our Freenet6 IPv6 service last night and it seems to be the same on AMS-IX. Has anyone else seen the same? Any idea why? Multiple options, but it must have something todo with a free usenet service. We (XS4ALL, AS3265) changed some filters at around 15:00 GMT, but I notice the drop is hours later and much bigger (se the graph at https://www.ams-ix.net/technical/stats/sflow/). If you have trouble reaching newszilla6.xs4all.nl at port 119 please drop me a note as you might accidently got filtered and I'm happy to resolve this. From the looks of it one of our colleagues who also run a free usenet box have some issues as well, news.ipv6.eweka.nl isn't responding, which may well be the only cause of this little drop. Groet, MarcoH
Re: Anomalies with AS13214 ?
On 11/5/09 16:30, Jay Hennigan wrote: We're getting cyclops[1] alerts that AS13214 is advertising itself as origin for all of our prefixes. Their anomaly report shows thousands of prefixes originating there. Anyone else seeing evidence of this or being affected? [1] http://cyclops.cs.ucla.edu/ I'm seeing alerts for AS13214 advertising our prefixes from cyclops also. However a quick look at a few looking glasses and route servers doesnt seem to show any rogue advertisments, and we havent see any drop in traffic as yet. Vince -- Jay Hennigan - CCIE #7880 - Network Engineering - j...@impulse.net Impulse Internet Service - http://www.impulse.net/ Your local telephone and internet company - 805 884-6323 - WB6RDV
