Re: What's the point of prepend communities?

2017-10-26 Thread joel jaeggli
On 10/26/17 10:58, Jason Lixfeld wrote: > Hi, > > Of all the ISPs that I am familiar with that have a BGP community structure > usable by their peering partners and/or downstream customers, among other > things, they allow the customer to signal the ISP to prepend their own AS to > the as-path

Re: Ping a Comcast Business DNS Admin?

2017-10-26 Thread Aaron C. de Bruyn via NANOG
I received replied from several friendly Comcast staff members and it looks like there will be a resolution shortly. Thanks, and sorry for the list noise. -A On Thu, Oct 26, 2017 at 3:33 PM, Aaron C. de Bruyn wrote: > I'm hoping a Comcast engineer can clear something up for

Ping a Comcast Business DNS Admin?

2017-10-26 Thread Aaron C. de Bruyn via NANOG
I'm hoping a Comcast engineer can clear something up for me: If I recall correctly siteprotect.com is used by Comcast Business hosting. We have a mutual customer who has their domain NS pointed at ADNS.CS.SITEPROTECT.COM and BDNS.CS.SITEPROTECT.COM and those servers resolve their domain

RE: What's the point of prepend communities?

2017-10-26 Thread Naslund, Steve
No, Mr Herrin was correct in the first place. The BGP communities are used to control to which peers the prepend is applied. You cannot do this within your own BGP configuration. Here is the use case. I have a connection to AT and I have one to Comcast I want AT customers to come to me over

Re: What's the point of prepend communities?

2017-10-26 Thread Clinton Work
I believe that Jason is asking about an ISP BGP community to prepend their AS when the BGP routes are received from the customer (not when advertising to a peer). I don't see a functional difference between the two and I suspect that ISPs added support for convenience. If you already send BGP

Re: What's the point of prepend communities?

2017-10-26 Thread Brett Frankenberger
On Thu, Oct 26, 2017 at 03:05:25PM -0400, William Herrin wrote: > > You'd only use communities like that if you want to signal the ISP to > deprioritize your advertisement on a particular peer or set of peers but > not others. That's when you're getting fancy. It's not the norm. The norm > is you

RE: What's the point of prepend communities?

2017-10-26 Thread Naslund, Steve
That is exactly correct. It is normally used to control which peers the ISP is prepended to. Many times the ISP has a guide that shows several different communities you can use to further control BGP beyond what you normally could do yourself. Steven Naslund Chicago IL -Original

Re: What's the point of prepend communities?

2017-10-26 Thread Leo Bicknell
In a message written on Thu, Oct 26, 2017 at 02:47:44PM -0400, Jason Lixfeld wrote: > I understand how prepends fit in the context of best path selection, but my > question was more the difference between a customer signalling the ISP to > prepend their AS using a BGP community stamped to a

Re: What's the point of prepend communities?

2017-10-26 Thread William Herrin
On Thu, Oct 26, 2017 at 3:05 PM, William Herrin wrote: > On Thu, Oct 26, 2017 at 2:47 PM, Jason Lixfeld > wrote: > You'd only use communities like that if you want to signal the ISP to > deprioritize your advertisement on a particular peer or set of peers

Re: What's the point of prepend communities?

2017-10-26 Thread Jason Lixfeld
> On Oct 26, 2017, at 2:55 PM, Job Snijders wrote: > > If Network B offers some kind of “Prepend to Network C” BGP community, > network A will be able to utilize all of network B except the pieces that > perform less well. (This is ofcourse assuming that Network C picks some >

Re: What's the point of prepend communities?

2017-10-26 Thread William Herrin
On Thu, Oct 26, 2017 at 2:47 PM, Jason Lixfeld wrote: > Hi Bill, > > > On Oct 26, 2017, at 2:37 PM, William Herrin wrote: > > > > BGP routing is based on "distance". Distance in BGP is primarily > calculated as the number of ASNs in the AS Path. Prepends

Re: What's the point of prepend communities?

2017-10-26 Thread Job Snijders
Hi, In context of traffic engineering it may be that Network A (customer of Network B) observes that performance is suboptimal between Network B and Network C. If Network B offers some kind of “Prepend to Network C” BGP community, network A will be able to utilize all of network B except the

Re: What's the point of prepend communities?

2017-10-26 Thread Christopher Morrow
On Thu, Oct 26, 2017 at 2:47 PM, Jason Lixfeld wrote: > Hi Bill, > > > On Oct 26, 2017, at 2:37 PM, William Herrin wrote: > > > > BGP routing is based on "distance". Distance in BGP is primarily > calculated as the number of ASNs in the AS Path. Prepends

Re: What's the point of prepend communities?

2017-10-26 Thread Jason Lixfeld
Hi Bill, > On Oct 26, 2017, at 2:37 PM, William Herrin wrote: > > BGP routing is based on "distance". Distance in BGP is primarily calculated > as the number of ASNs in the AS Path. Prepends make a path more distance, > encouraging routers to choose a different path if one is

Re: What's the point of prepend communities?

2017-10-26 Thread William Herrin
On Thu, Oct 26, 2017 at 1:58 PM, Jason Lixfeld wrote: > Of all the ISPs that I am familiar with that have a BGP community > structure usable by their peering partners and/or downstream customers, > among other things, they allow the customer to signal the ISP to prepend >

What's the point of prepend communities?

2017-10-26 Thread Jason Lixfeld
Hi, Of all the ISPs that I am familiar with that have a BGP community structure usable by their peering partners and/or downstream customers, among other things, they allow the customer to signal the ISP to prepend their own AS to the as-path of a particular prefix announcement. What

RE: Physical Layer fiber Software Tools?

2017-10-26 Thread Jameson, Daniel
http://www.crestpt.com/data-center-infrastructure-management-dcim.html -Original Message- From: NANOG [mailto:nanog-boun...@nanog.org] On Behalf Of Jameson, Daniel Sent: Thursday, October 26, 2017 11:32 AM To: Craig; nanog group Subject: RE: Physical Layer fiber Software Tools?

Re: Physical Layer fiber Software Tools?

2017-10-26 Thread Craig
was the link attached? On Thu, Oct 26, 2017 at 1:31 PM, Jameson, Daniel < daniel.jame...@tdstelecom.com> wrote: > Give this a look. It can track to the cross-connect level, then provide > a one-line drawing. Application is web driven and expandable. It should be > able to do what you need. >

RE: Physical Layer fiber Software Tools?

2017-10-26 Thread Jameson, Daniel
Give this a look. It can track to the cross-connect level, then provide a one-line drawing. Application is web driven and expandable. It should be able to do what you need. -Original Message- From: NANOG [mailto:nanog-boun...@nanog.org] On Behalf Of Craig Sent: Thursday, October 26,

Re: Physical Layer fiber Software Tools?

2017-10-26 Thread Andrew Latham
https://en.wikipedia.org/wiki/Data_center_infrastructure_management Many solutions exist. Some are targeted for different uses. Look at https://netbox.readthedocs.io/en/latest/data-model/circuits/ for some terminology that might help in your search. On Thu, Oct 26, 2017 at 10:08 AM, Craig

Physical Layer fiber Software Tools?

2017-10-26 Thread Craig
I am hoping someone could help me out with some suggestions for any software that is available, for individuals that are doing physical layer wiring in a data center? The idea is the technician is performing the fiber runs from say RACK 111 router AAA port 1/1/1 to RACK 222 router BBB port 1/1/1