Re: Best practices for BGP Communities

[Christopher Morrow]

On Wed, Mar 6, 2019 at 7:53 PM Randy Bush  wrote:

> > How does one distinguish "informational" and "action" of unknown
> > communities?
>
>
"if the community is unknown why would you take any action except to strip
it?"


> the action ones are divisible by 3
>
> 
>
> you are in a twisty maze where there are no formnally defined semantics,
> only a #:# syntax.  if there were general formal semantics, it could
> have been put directly in bgp attributes.
>
>
isn't it really that the communities (well known aside) mean what you want
them to mean? you get to be creative and have fun!! imagine the fun you'll
leave behind with your follow on networking folks at your job!! great
times!

Re: Best practices for BGP Communities

[Randy Bush]

> How does one distinguish "informational" and "action" of unknown
> communities?

the action ones are divisible by 3



you are in a twisty maze where there are no formnally defined semantics,
only a #:# syntax.  if there were general formal semantics, it could
have been put directly in bgp attributes.

steaming pile

Anybody from switch.com (AS23005) lurking about?

[Bryan Holloway]

If so, could you please contact me off-list?

2019-2020 NANOG Scholarship Application Now Available

[NANOG Support]

NANOG is pleased to announce the 2019-2020 Scholarship Application is now
available.  The application will remain open until April 16, 2019.

NANOG will be providing four (4) scholarships of $10,000 each for the
2019-2020 school year.  Applicants must meet the listed criteria, and not
be a prior recipient of a NANOG Scholarship.  Please see
https://www.nanog.org/scholarships for more information and a link to a
flyer you can share.

Students can go directly to the application site here:
https://www.scholarsapply.org/nanog/

Any peeps from Ookla on the list?

[Mike Lyon]

If so, can you contact me off-list please?

Thank You,
Mike

-- 
Mike Lyon
mike.l...@gmail.com
http://www.linkedin.com/in/mlyon

Re: Best practices for BGP Communities

[Arnold Nipper]

On 04.03.2019 19:15, John Kristoff wrote:
> On Mon, 4 Mar 2019 01:42:02 +
> Joshua Miller  wrote:
> 
>> A while back I read somewhere that transit providers shouldn't delete
>> communities unless the communities have a specific impact to their
>> network, but my google-fu is failing me and I can't find any sources.
> 
> Perhaps you're referring to this recent work?
> 
>   
> 

See also

 
https://2019.apricot.net/assets/files/APKS756/weaponizing-bgp-using-communities.pdf


Arnold
-- 
Arnold Nipper
email: arn...@nipper.de
mobile: +49 172 2650958



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Description: OpenPGP digital signature

March is Severe Weather Month - Plan Ahead for Disasters

[Sean Donelan]

Network operators are involved in most weather disasters.

March is Severe Weather Month in the U.S. The National Weather Service and 
many states use severe weather month to encourage public planning and 
preparedness.


https://www.ready.gov/
https://www.weather.gov/wrn/


Remember, your Amazon Alexa, Google Assistant, Applie Siri smart speakers, 
smart TVs, and smart assistants won't practively warn you about emergency 
alerts or weather warnings. Amazon Alexa will tell you about weather 
warnings, but only when you ask about the weather.


The FEMA National Advisory Council published its recommendations for 
Modernizing the Nation's Public Alert and Warning System, which included 
adding alerts to new technologies.


https://www.fema.gov/media-library/assets/documents/177192

"Ensure people can receive and understand geo-targeted IPAWS messages in 
numerous ways, including social media, mobile aps, automotive GPS units, 
driverless cars and intelligent in-home automated systems (e.g., Smart 
Speakers)."



I also have some suggestions for Wireless Emergency Alerts, in case any 
Apple iOS or Google Android developers are reading.


1. Improving the WEA Imminent Threat Class and Categories
2. Redefining the Child Abduction Emergency/AMBER class
3. Do Not Disturb WEA Behavior for Less Severe Alerts
4. Revising Sample WEA Options Menu
5. Default WEA class names for mobile device user interfaces

https://www.donelan.com/WEA-Improvements.pdf
https://www.donelan.com/eas.html

Re: Arista Layer3

[Kaiser, Erich]

Agreed.


On Wed, Mar 6, 2019 at 2:16 AM Brandon Martin 
wrote:

> On 3/6/19 12:36 AM, Colton Conor wrote:
> > How much do these boxes cost?
>
> List is about $100k in North America for a 9640 with all the ports
> "unlocked", full hardware kit (PSUs, fans, etc.) and some
> maintenance/support.  Take whatever your standard Brocade/Extreme
> discount from that tends to look like.  I should hope nobody pays list
> or anywhere close.
> --
> Brandon Martin
>

Re: Best practices for BGP Communities

[Joshua Miller]

Thanks for all the feedback.

Follow up questions:

How does one distinguish "informational" and "action" of unknown
communities?

Also, why would a transit provider go out of their way to remove unknown
communities that don't have any meaning within their network? What benefit
would it serve the transit provider?

Best,
Josh

On Tue, Mar 5, 2019 at 8:18 PM Job Snijders  wrote:

> On Wed, Mar 6, 2019 at 8:32 Smith, Courtney 
> wrote:
>
>> On 3/5/19, 6:04 PM, "NANOG on behalf of Job Snijders"
>> > j...@instituut.net> wrote:
>>
>> On Sun, Mar 03, 2019 at 08:42:02PM -0500, Joshua Miller wrote:
>> > A while back I read somewhere that transit providers shouldn't
>> delete
>> > communities unless the communities have a specific impact to their
>> > network, but my google-fu is failing me and I can't find any
>> sources.
>> >
>> > Is this still the case? Does anyone have a source for the practice
>> of
>> > leaving unknown communities alone or deleting them?
>>
>> https://tools.ietf.org/html/rfc7454#section-11
>>
>>
>> Remember policies between two peers may not be same as customer policies.
>>
>> Example:  Customers_of_transit_X >>> Transit X >>> Peer_A >>
>> Customers_of_Peer_A
>>
>> Customers_of_Peer_A may use community A:50 to set local pref to 50 in
>> Peer_A network.  But that doesn’t not mean Customers_of_transit_X can send
>> A:50 to set lpref on their routes in Peer_A's network.  Peer_A's policy
>> with Transit X likely does not take action on customer communities since
>> they are 'peers' not customers.  Transit X can send A:50 to Peer_A but
>> nothing would happen.  What's the benefit of Transit X preserving A:50 from
>> its customers if it means nothing in Transit X?
>
>
>
> OP didn’t specify what kind of BGP communities they were referring to. In
> general we can separate communities into two categories: “Informational”
> and “Action”. You are right that preserving/propagating “action”
> communities (such as in your example) probably isn’t that interesting.
> “informational” communities on the other hand can be very valuable.
>
> See https://tools.ietf.org/html/rfc8195 for more information on how the
> two types differ.
>
> Kind regards,
>
> Job
>
>

Facebook Will Begin Selling Wholesale Fiber Capacity

[Mehmet Akcin]

Just read this.

https://datacenterfrontier.com/facebook-will-begin-selling-wholesale-fiber-capacity/?fbclid=IwAR3sgfisNYrQzzfJlanFSajIymOP-4USxhPR1s8MeiKtzNY4hRTdXYB2bz8

Looking forward to discussions.

mehmet

Re: WIndows Updates Fail Via IPv6 - Update!

[Mark Tinka]

On 6/Mar/19 08:38, Fernando Gont wrote:

>
> RFC4821 seems to signal that the IETF has given up in making ICMP-based
> PMTUD work, and aims at a (mostly) ICMP-free PMTUD.

As much as I hate to admit it, I think this is a more realistic approach.

Mark.

Re: WIndows Updates Fail Via IPv6 - Update!

[Mark Tinka]

On 6/Mar/19 08:29, Mark Andrews wrote:

> Make a big enough stink and it will get fixed.  People just don’t make enough 
> of
> a stink.  Use social media.  None of the companies with broken firewalls 
> really
> want their idiotic practices pointed out in public.  Start doing so every time
> you see it #STUPIDFIREWALL.

I think the (Inter)network is growing a lot faster than we can shame
folk into fixing things.

Mark.

Re: Arista Layer3

[Brandon Martin]

On 3/6/19 12:36 AM, Colton Conor wrote:

How much do these boxes cost?


List is about $100k in North America for a 9640 with all the ports 
"unlocked", full hardware kit (PSUs, fans, etc.) and some 
maintenance/support.  Take whatever your standard Brocade/Extreme 
discount from that tends to look like.  I should hope nobody pays list 
or anywhere close.

--
Brandon Martin

Re: Arista Layer3

[Brandon Martin]

On 3/6/19 3:05 AM, Dmitry Sherman wrote:

Is there any reason to have 2M routes support for next 3 years?


Full IPv4 table + full IPv6 table + multiple VRFs (BGP-VPN, etc.) plus 
lots of on-net deaggregates could well push you above 1M right now 
especially if your platform also shares that "1M" FIB space with 
next-hop L2 information, ARP/ND entries, etc.  Bonus points for neeing 
MPLS info in FIB, too, on MPLS PE routers.


IPv4 DFZ alone is rapidly growing to where it'll hit 1M for most 
viewpoints without FIB compression, though most end networks can 
probably compress it down a fair bit from that.


2M is the next "logical" FIB scale to target, I guess.  I've seen 1.5M 
boxes, too, though the headline FIB scale is always suspect.  You have 
to look at how other things that sit in TCAM will eat into that scale, 
whether it has static or dynamic CAM partitions, etc.

--
Brandon Martin

Re: Arista Layer3

[Dmitry Sherman]

Is there any reason to have 2M routes support for next 3 years?

--
Dmitry Sherman
Interhost Networks Ltd
dmi...@interhost.net
Mobile: +972-54-3181182
Office: +972-74-7029881
Web: www.interhost.co.il

From: NANOG  on behalf of Roel Parijs 

Date: Wednesday, 6 March 2019 at 0:47
To: "nanog@nanog.org" 
Subject: Re: Arista Layer3

We have been using the 7280SR-48C6 for 2.5 years now. Just after Arista 
announced the full table BGP routing.
Looking at the price / port there is nothing near Arista. We also use Cisco 
ASR1K and Juniper MX204 but these have far less capacity.

When we first started, there were quite a few features missing but over the 
past 2 year they have really been catching up. I was very happy when they added 
MSS clamping at the end of last year.

The new version 7280R2K should be able to handle 2M routes.

On Tue, Mar 5, 2019 at 9:31 PM 
mailto:na...@jack.fr.eu.org>> wrote:
Check out the 7280sr2k, which is actually 24*10G, 24*25G, 6*100G

On 03/05/2019 08:55 PM, David Hubbard wrote:
> I love the NCS5501, but once Arista gets the 2M-route capacity down into the 
> 48x10g format, I'd jump ship in a heartbeat; currently you have to do a much 
> larger chassis-based device or their 100gig 7280 to have that route scale.  
> My big gripes with the 5501 are that, due to its architecture, if you want to 
> do uRPF, you chop your route scale in half, even on the 5501-SE.  5501 also 
> has no supported configuration where you have both first hop redundancy and 
> physical path redundancy, because you can't do both VRRP (its only redundant 
> first hop option) and BVI's, can't do MC-LAG, can't do vPC, so you need 
> switches in addition to the 5501's if that's the goal..
>
> David
>