Re: Network SLA

[Zartash Uzmi]

As I gather, there is a mix of answers, ranging from "building the resources
according to requirements and HOPE for the best" to "use of arguably
sophisticated tools and perhaps sharing the results with the legal
department".

I would be particularly interested in hearing the service providers'
viewpoint on the following situation.

Consider a service provider with MPLS deployed within its own network.

(A) When the SP enters into a relation with the customer, does the SP
establish new MPLS paths based on customer demands (this is perhaps similar
to "building" based on requirements as pointed out by David)? If yes,
between what sites/POPs? I assume the answer may be different depending upon
a single-site customer or a customer with multiple sites.

(B) For entering into the relationship for providing X units of bandwidth
(to another site of same customer or to the Tier-1 backbone), does the SP
use any wisdom (in addition to MRTG and the likes)? If so, what scientific
parameters are kept in mind?

(C) How does the customer figure out that a promise for X units of bandwidth
is maintained by the SP? I believe customers may install some measuring
tools but is that really the case in practice?

Thanks,
Zartash

On Fri, Feb 20, 2009 at 1:16 AM, Stefan  wrote:

> Saqib Ilyas wrote:
>
>> Greetings
>> I am curious to know about any tools/techniques that a service provider
>> uses
>> to assess an SLA before signing it. That is to say, how does an
>> administrator know if he/she can meet what he is promising. Is it based on
>> experience? Are there commonly used tools for this?
>> Thanks and best regards
>>
>>
> Not necessarily as a direct answer (I am pretty sure there'll be others on
> this list giving details in the area of specific tools and standards), but I
> think this may be a question (especially considering your end result
> concern: *signing the SLA!) equally applicable to your legal department. In
> the environment we live, nowadays, the SLA could (should?!? ...
> unfortunately) be "refined" and (at the other end - i.e. receiving)
> "interpreted" by the lawyers, with possibly equal effects (mostly financial
> and as overall impact on the business) as the tools we (the technical
> people) would be using to measure latency, uptime, bandwidth, jitter, etc...
>
> Stefan
>
>

FW: Ctrl+Shift+6 then X

[Bruce Grobler]

Hi Guys,

 

If anyone can tell me how to resolve this issue there's a strong possibility
of a fedex'd beer. 

 

Using Putty or any other ssh/telnet terminal I find that Ctrl+Shift+6 then X
(on a cisco) works only sometimes after beating your keyboard multiple times
with a hammer, has anyone else come across or had a solution to this problem
? 

 

Regards,

 

Bruce Grobler

Yo!Africa  - Network Engineer

Landline: +263-4-701300, Cellphone: +263-91-2364532

Skype ID: bruce.grobler

 

Re: FW: Ctrl+Shift+6 then X

[Elmar K. Bins]

Re Bruce,

br...@yoafrica.com (Bruce Grobler) wrote:

> Using Putty or any other ssh/telnet terminal I find that Ctrl+Shift+6 then X
> (on a cisco) works only sometimes after beating your keyboard multiple times
> with a hammer, has anyone else come across or had a solution to this problem
> ? 

I have found that using "Ctrl-6" (through putty) gives me breaks on Ciscos.
You usually have to wait for the device to poll for a break (especially in
pings/traceroutes), but it does actually work.

Elmar.

PS: Please don't fedex beer to Germany...

Re: FW: Ctrl+Shift+6 then X

[Shon Elliott]

Bruce,

I have that problem using any terminal program (I use SecureCRT).. I have to
bang the command like 10-20 times for the device to recognize it. Kind of wished
CTRL-C or something worked better and actually worked well.


Shon Elliott
Senior Network Engineer
unWired Broadband, Inc.



Bruce Grobler wrote:
> Hi Guys,
> 
>  
> 
> If anyone can tell me how to resolve this issue there's a strong possibility
> of a fedex'd beer. 
> 
>  
> 
> Using Putty or any other ssh/telnet terminal I find that Ctrl+Shift+6 then X
> (on a cisco) works only sometimes after beating your keyboard multiple times
> with a hammer, has anyone else come across or had a solution to this problem
> ? 
> 
>  
> 
> Regards,
> 
>  
> 
> Bruce Grobler
> 
> Yo!Africa  - Network Engineer
> 
> Landline: +263-4-701300, Cellphone: +263-91-2364532
> 
> Skype ID: bruce.grobler
> 
>  
> 
> 

RE: FW: Ctrl+Shift+6 then X

[Bruce Grobler]

Ye, exact same things happens for me, then after it decides to execute it
you have a nice long line of 6x6x66x6x666x6, tried the Ctrl+6 no such
luck...

-Original Message-
From: Shon Elliott [mailto:s...@unwiredbb.com] 
Sent: Monday, February 23, 2009 10:48 AM
To: nanog@nanog.org >> nanog
Subject: Re: FW: Ctrl+Shift+6 then X

Bruce,

I have that problem using any terminal program (I use SecureCRT).. I have to
bang the command like 10-20 times for the device to recognize it. Kind of
wished
CTRL-C or something worked better and actually worked well.


Shon Elliott
Senior Network Engineer
unWired Broadband, Inc.



Bruce Grobler wrote:
> Hi Guys,
> 
>  
> 
> If anyone can tell me how to resolve this issue there's a strong
possibility
> of a fedex'd beer. 
> 
>  
> 
> Using Putty or any other ssh/telnet terminal I find that Ctrl+Shift+6 then
X
> (on a cisco) works only sometimes after beating your keyboard multiple
times
> with a hammer, has anyone else come across or had a solution to this
problem
> ? 
> 
>  
> 
> Regards,
> 
>  
> 
> Bruce Grobler
> 
> Yo!Africa  - Network Engineer
> 
> Landline: +263-4-701300, Cellphone: +263-91-2364532
> 
> Skype ID: bruce.grobler
> 
>  
> 
> 

RE: Ctrl+Shift+6 then X

[Moriniaux Michel]

Hi,
Yep does that all the time the worst is on a traceroute where it seems you need 
to wait for the end of line to send the ctrl+shift+6.
Workaround on cisco:
Line con 0
 Escape-character 3
Line vty 0 4
 Escape-character 3

Whith this you can just CTRL+C 

Cheers,
Michel Moriniaux

-Message d'origine-
De : Bruce Grobler [mailto:br...@yoafrica.com] 
Envoyé : lundi 23 février 2009 09:22
À : nanog@nanog.org
Objet : FW: Ctrl+Shift+6 then X

Hi Guys,

 

If anyone can tell me how to resolve this issue there's a strong possibility
of a fedex'd beer. 

 

Using Putty or any other ssh/telnet terminal I find that Ctrl+Shift+6 then X
(on a cisco) works only sometimes after beating your keyboard multiple times
with a hammer, has anyone else come across or had a solution to this problem
? 

 

Regards,

 

Bruce Grobler

Yo!Africa  - Network Engineer

Landline: +263-4-701300, Cellphone: +263-91-2364532

Skype ID: bruce.grobler

 

Re: FW: Ctrl+Shift+6 then X

[William Herrin]

On Mon, Feb 23, 2009 at 3:48 AM, Shon Elliott  wrote:
> I have that problem using any terminal program (I use SecureCRT).. I have to
> bang the command like 10-20 times for the device to recognize it. Kind of 
> wished
> CTRL-C or something worked better and actually worked well.

I usually change the escape character to ctrl-C using:

line vty 0 15
escape-character 3

Then you can escape with Ctrl-C followed by x.

Regards,
Bill Herrin


-- 
William D. Herrin  her...@dirtside.com  b...@herrin.us
3005 Crane Dr. .. Web: 
Falls Church, VA 22042-3004

RE: FW: Ctrl+Shift+6 then X

[Ivan Pepelnjak]

Just configure a different escape character with "terminal escape x". For
example, "term esc 3" will make Ctrl/C the escape character (and Ctrl/C+X
the escape sequence). Ctrl/^ is "somewhat" hard to get on "some" terminal
emulators :)

Ivan

> > If anyone can tell me how to resolve this issue there's a strong
> possibility
> > of a fedex'd beer. 
> > 
> > Using Putty or any other ssh/telnet terminal I find that 
> Ctrl+Shift+6 
> > then
> X
> > (on a cisco) works only sometimes after beating your 
> keyboard multiple
> times
> > with a hammer, has anyone else come across or had a solution to this
> problem

Re: Great outage of 1997 - Does anyone recall?

[Gadi Evron]

On Sun, 22 Feb 2009, Danny McPherson wrote:


On Feb 22, 2009, at 10:10 PM, Christopher Morrow wrote:


On Mon, Feb 23, 2009 at 12:06 AM, Paul Wall  wrote:

On Sun, Feb 22, 2009 at 2:57 AM, Gadi Evron  wrote:

What was that story with an African routes some years back, any memories
anyone? I am looking for a reference.


146.20.0.0/16?


that's erie forge/steal... I think maybe Gadi's referring to the 41/8
used by an italian DSL provider for their internal network?? (not
announced outside their ASN I don't think)


Or the AFOL-KE thing with Above last March:




Thanks for all the references!



-danny

RE: Ctrl+Shift+6 then X

[Bruce Grobler]

Oh wow, that worked like a charm  Thanks a bunch!!! :D

-Original Message-
From: Moriniaux Michel [mailto:mmorini...@prosodie.com] 
Sent: Monday, February 23, 2009 11:18 AM
To: Bruce Grobler; nanog@nanog.org
Subject: RE: Ctrl+Shift+6 then X

Hi,
Yep does that all the time the worst is on a traceroute where it seems you
need to wait for the end of line to send the ctrl+shift+6.
Workaround on cisco:
Line con 0
 Escape-character 3
Line vty 0 4
 Escape-character 3

Whith this you can just CTRL+C 

Cheers,
Michel Moriniaux

-Message d'origine-
De : Bruce Grobler [mailto:br...@yoafrica.com] 
Envoyé : lundi 23 février 2009 09:22
À : nanog@nanog.org
Objet : FW: Ctrl+Shift+6 then X

Hi Guys,

 

If anyone can tell me how to resolve this issue there's a strong possibility
of a fedex'd beer. 

 

Using Putty or any other ssh/telnet terminal I find that Ctrl+Shift+6 then X
(on a cisco) works only sometimes after beating your keyboard multiple times
with a hammer, has anyone else come across or had a solution to this problem
? 

 

Regards,

 

Bruce Grobler

Yo!Africa  - Network Engineer

Landline: +263-4-701300, Cellphone: +263-91-2364532

Skype ID: bruce.grobler

 

Re: Ctrl+Shift+6 then X

[Mark Smith]

On Mon, 23 Feb 2009 11:28:17 +0200
"Bruce Grobler"  wrote:

> Oh wow, that worked like a charm  Thanks a bunch!!! :D
> 

What, nobody's using vt220s anymore?

(Almost bought one (or rather a vt420) off ebay for fun to plug in to
one of our 2500 terminal servers for the machine room - but realised
that not having cut-and-paste would be very annoying.)

> -Original Message-
> From: Moriniaux Michel [mailto:mmorini...@prosodie.com] 
> Sent: Monday, February 23, 2009 11:18 AM
> To: Bruce Grobler; nanog@nanog.org
> Subject: RE: Ctrl+Shift+6 then X
> 
> Hi,
> Yep does that all the time the worst is on a traceroute where it seems you
> need to wait for the end of line to send the ctrl+shift+6.
> Workaround on cisco:
> Line con 0
>  Escape-character 3
> Line vty 0 4
>  Escape-character 3
> 
> Whith this you can just CTRL+C 
> 
> Cheers,
> Michel Moriniaux
> 
> -Message d'origine-
> De : Bruce Grobler [mailto:br...@yoafrica.com] 
> Envoyé : lundi 23 février 2009 09:22
> À : nanog@nanog.org
> Objet : FW: Ctrl+Shift+6 then X
> 
> Hi Guys,
> 
>  
> 
> If anyone can tell me how to resolve this issue there's a strong possibility
> of a fedex'd beer. 
> 
>  
> 
> Using Putty or any other ssh/telnet terminal I find that Ctrl+Shift+6 then X
> (on a cisco) works only sometimes after beating your keyboard multiple times
> with a hammer, has anyone else come across or had a solution to this problem
> ? 
> 
>  
> 
> Regards,
> 
>  
> 
> Bruce Grobler
> 
> Yo!Africa  - Network Engineer
> 
> Landline: +263-4-701300, Cellphone: +263-91-2364532
> 
> Skype ID: bruce.grobler
> 
>  
> 
> 

switch speed question

[Deric Kwok]

Hi

Can you share your experience what is fastest Gig switch?

I see there is CEF feature in cisco.

ls it big different when i enable it in switch vs other switch?

ls there any problem?

Thank you

Re: switch speed question

[Brian Feeny]

Can you elaborate a bit on your question?  The fastest "Gig switches"  
can do 1GB full speed on the port.  There are many that can do that.
Do you have a particular density you need to do full speed with? Any  
particular features?  Are you looking at any particular models now, in  
others words have you
even begun to explore this before posting here?  Are you looking at  
Layer 3 switching, I assume you are since you are asking about CEF.   
Every manufacturer has a way
of switching the packets, Cisco uses CEF, and yes if you enable CEF  
its a big difference vs. a netgear gig switch from best buy, but I  
think you are wanting more of an answer than that

and you just need to give us some more info.

Brian

On Feb 23, 2009, at 10:08 AM, Deric Kwok wrote:


Hi

Can you share your experience what is fastest Gig switch?

I see there is CEF feature in cisco.

ls it big different when i enable it in switch vs other switch?

ls there any problem?

Thank you

Re: comcast price check

[Justin Wilson - MTIN]

In a "Former Life" we used Comcast for transport for a school corporation.
In the 3 years we used them we have 10 minutes of unscheduled downtime.


Justin

RE: external L2 ethernet connections

[Holmes,David A]

All of the protocols below should be turned off; my understanding is
that with dot1q trunking vlan1 cannot be removed from the trunk,
although Cisco's isl trunking allows the removal of all vlans. If Cisco
equipment is used, the "bpdu filter" command is useful as it instructs
the switch to neither send bpdus nor accept them. These are good
practices not just for connectivity to other AS's, but also in cases
where Ethernet switches comprise a geographically dispersed WAN
backbone. The key is to turn off all layer 2 state machines in the
connected Ethernet switches, enabling only layer 3 state machines. 

We have found with some vendors' equipment that the layer 2/layer 3
state machines are not tightly integrated so, for instance, a cam
timeout in layer 2 will remove the underlying port/mac table entry for a
destination layer 3 network, resulting in unknown unicast flooding with
noticeable effects on user response time.

-Original Message-
From: Joe Maimon [mailto:jmai...@ttec.com] 
Sent: Friday, February 20, 2009 6:42 AM
To: nanog@nanog.org
Subject: external L2 ethernet connections

Does anyone have a best practice list of things to disable/filter/turn 
off on ethernet ports l2 connected to other AS's

cdp
stp
switchport negotiate
vtp
if trunking, limit vlans, no vlan1

So on so forth.

Switches do so many darn things all by themselves, as any packet capture

shows.

Thanks,

Joe

NANOG in the news

[neal rauhauser]

http://www.thecuttingedgenews.com/index.php?article=1&pageid=28&pagename=Sci-Tech


-- 
mailto:n...@layer3arts.com //
GoogleTalk: nrauhau...@gmail.com
IM: nealrauhauser

Re: NANOG in the news

[Tony Rall]

Very nice.  But note that our group's name is "North American Network 
Operators' Group" (not "Operations").

--
Tony Rall

Re: NANOG in the news

[neal rauhauser]

 Whoops - will have to go dig and see if that's my error or the editors.
They've wound it up a bit over my reporting ... the audience there is
educated but non-technical.



On Mon, Feb 23, 2009 at 12:26 PM, Tony Rall  wrote:

> Very nice.  But note that our group's name is "North American Network
> Operators' Group" (not "Operations").
>
> --
> Tony Rall
>



-- 
mailto:n...@layer3arts.com //
GoogleTalk: nrauhau...@gmail.com
IM: nealrauhauser

ISIS route summarization

[Jack Bates]

In a level2 only ISIS network (not using multiple areas due to MPLS 
limitations), is there a better method for handling aggregate routes 
than creating an aggregate and redistributing it into ISIS for each 
router? Primarily Cisco/Juniper based. Cisco I believe has an aggregate 
option in ISIS (similar to OSPF) and Juniper has a separate aggregate 
function which can be distributed into ISIS. Neither can do 
summarization per say unless they cross between levels; unless I'm mistaken.


Offlist input is fine. Just trying to double check my brain while 
setting up IPv6 on the access edges.


Link state does have it's limitations. ;)


-Jack

RE: FW: Ctrl+Shift+6 then X

[Tom Storey]

FWIW Ive rarely had a problem breaking out of ping/traceroute/etc on a Cisco.

I have found that Shift-Ctrl, then a very very small delay and 6 (while
still holding down Shift-Ctrl) works like a charm every time.

Maybe the terminals I use are just more friendly towards that sort of key
sequence than others. :-)

Though the only thing it doesnt seem to help with is when you have no DNS
servers configured and mistype "configt", or some other command that
doesnt exist and it tries to resolve it through broadcast several times.
Ive found its futile to try and get out of that.

Tom

> Ye, exact same things happens for me, then after it decides to execute it
> you have a nice long line of 6x6x66x6x666x6, tried the Ctrl+6 no such
> luck...
>
> -Original Message-
> From: Shon Elliott [mailto:s...@unwiredbb.com]
> Sent: Monday, February 23, 2009 10:48 AM
> To: nanog@nanog.org >> nanog
> Subject: Re: FW: Ctrl+Shift+6 then X
>
> Bruce,
>
> I have that problem using any terminal program (I use SecureCRT).. I have
> to
> bang the command like 10-20 times for the device to recognize it. Kind of
> wished
> CTRL-C or something worked better and actually worked well.
>
>
> Shon Elliott
> Senior Network Engineer
> unWired Broadband, Inc.
>
>
>
> Bruce Grobler wrote:
>> Hi Guys,
>>
>>
>>
>> If anyone can tell me how to resolve this issue there's a strong
> possibility
>> of a fedex'd beer.
>>
>>
>>
>> Using Putty or any other ssh/telnet terminal I find that Ctrl+Shift+6
>> then
> X
>> (on a cisco) works only sometimes after beating your keyboard multiple
> times
>> with a hammer, has anyone else come across or had a solution to this
> problem
>> ?
>>
>>
>>
>> Regards,
>>
>>
>>
>> Bruce Grobler
>>
>> Yo!Africa  - Network Engineer
>>
>> Landline: +263-4-701300, Cellphone: +263-91-2364532
>>
>> Skype ID: bruce.grobler
>>
>>
>>
>>
>
>
>

Re: FW: Ctrl+Shift+6 then X

[Nick Hilliard]

On 23/02/2009 23:02, Tom Storey wrote:

Though the only thing it doesnt seem to help with is when you have no DNS
servers configured and mistype "configt", or some other command that
doesnt exist and it tries to resolve it through broadcast several times.
Ive found its futile to try and get out of that.


line con 0
 transport preferred none
line vty 0 15
 transport preferred none

Nick

Re: FW: Ctrl+Shift+6 then X

[Chris Stebner]

'No ip domain lookup' will solve your problem instance below. Eg dns resolution 
attempt on typos.
-Original Message-
From: "Tom Storey" 

Date: Tue, 24 Feb 2009 09:32:28 
To: Bruce Grobler
Cc: 
Subject: RE: FW: Ctrl+Shift+6 then X


FWIW Ive rarely had a problem breaking out of ping/traceroute/etc on a Cisco.

I have found that Shift-Ctrl, then a very very small delay and 6 (while
still holding down Shift-Ctrl) works like a charm every time.

Maybe the terminals I use are just more friendly towards that sort of key
sequence than others. :-)

Though the only thing it doesnt seem to help with is when you have no DNS
servers configured and mistype "configt", or some other command that
doesnt exist and it tries to resolve it through broadcast several times.
Ive found its futile to try and get out of that.

Tom

> Ye, exact same things happens for me, then after it decides to execute it
> you have a nice long line of 6x6x66x6x666x6, tried the Ctrl+6 no such
> luck...
>
> -Original Message-
> From: Shon Elliott [mailto:s...@unwiredbb.com]
> Sent: Monday, February 23, 2009 10:48 AM
> To: nanog@nanog.org >> nanog
> Subject: Re: FW: Ctrl+Shift+6 then X
>
> Bruce,
>
> I have that problem using any terminal program (I use SecureCRT).. I have
> to
> bang the command like 10-20 times for the device to recognize it. Kind of
> wished
> CTRL-C or something worked better and actually worked well.
>
>
> Shon Elliott
> Senior Network Engineer
> unWired Broadband, Inc.
>
>
>
> Bruce Grobler wrote:
>> Hi Guys,
>>
>>
>>
>> If anyone can tell me how to resolve this issue there's a strong
> possibility
>> of a fedex'd beer.
>>
>>
>>
>> Using Putty or any other ssh/telnet terminal I find that Ctrl+Shift+6
>> then
> X
>> (on a cisco) works only sometimes after beating your keyboard multiple
> times
>> with a hammer, has anyone else come across or had a solution to this
> problem
>> ?
>>
>>
>>
>> Regards,
>>
>>
>>
>> Bruce Grobler
>>
>> Yo!Africa  - Network Engineer
>>
>> Landline: +263-4-701300, Cellphone: +263-91-2364532
>>
>> Skype ID: bruce.grobler
>>
>>
>>
>>
>
>
>

Re: FW: Ctrl+Shift+6 then X

[Tom Storey]

Erm, what does that have to do with DNS lookups? :-)

> line con 0
>   transport preferred none
> line vty 0 15
>   transport preferred none
>
> Nick
>

Re: FW: Ctrl+Shift+6 then X

[Tom Storey]

> 'No ip domain lookup' will solve your problem instance below. Eg dns

True, but only really useful until you configure the device and it can
reach a DNS server, at which point you lose the ability to resolve any
hostname, but would be very handy in a lab where DNS is never likely to
exist I must say.

I might include that into my lab template. :-)

Re: FW: Ctrl+Shift+6 then X

[Nick Hilliard]

On 23/02/2009 23:51, Tom Storey wrote:

Erm, what does that have to do with DNS lookups? :-)


Nothing at all, except that it stops this behaviour:


... when you have no DNS
servers configured and mistype "configt", or some other command that
doesnt exist and it tries to resolve it through broadcast several times.


More specifically, IOS command mode will assume by default that any non 
recognised command is actually a hostname which it should try to connect to 
- a fossilised relic of times past, when routers were often terminal 
servers.  You can stop it doing this by using "transport preferred none" on 
the appropriate line configuration.


Nick

Charter.net email routing issues

[John Martinez]

Is anyone else seeing a high rejection rate from charter.net email clients?

Re: Charter.net email routing issues

[John Martinez]

Yup, I knew that, sorry.

Ryan Rawdon wrote:
> You may want to try the mailop mailing list, which was created to try
> and shift mail operations traffic volume from NANOG: http://www.mailop.org/
> 
> Good luck with your issue,
> Ryan
> 
> John Martinez wrote:
>> Is anyone else seeing a high rejection rate from charter.net email
>> clients?
>>
>>
>>   
> 

Re: Charter.net email routing issues

[Suresh Ramasubramanian]

Anybody actually on that list?  Most of the serious mailops work is on
some other, entirely different lists.

And why do people have to think nanog is solely for packet pushing
related ops?  Email is operational, and its often the first ops
failure that your users notice, right after the ones that go "I cant
get to my pr0n".

On Tue, Feb 24, 2009 at 7:23 AM, John Martinez  wrote:
> Yup, I knew that, sorry.
>
> Ryan Rawdon wrote:
>> You may want to try the mailop mailing list, which was created to try
>> and shift mail operations traffic volume from NANOG: http://www.mailop.org/
>>
>> Good luck with your issue,
>> Ryan

Re: Charter.net email routing issues

[Kameron Gasso]

Suresh Ramasubramanian wrote:
> Anybody actually on that list?  Most of the serious mailops work is on
> some other, entirely different lists.

I followed up to John's message there.  We're currently seeing
intermittent timeouts when connecting TCP/25 on ib1.charter.net as well
as timeouts after the TCP session is established.

Thanks,
-- 
Kameron Gasso | Senior Systems Administrator | visp.net
Direct: 541-955-6903 | Fax: 541-471-0821