To all,
I am studying for a certain vendors test, and need some guidance on best practices. Lets say you have a MPLS VPN with 4 PE routers. Is it more efficient to use RR or Confederation?
Thank you,
Philip
need some guidance on best practices
What the vendor says is best practices, or what people in the trenches say?
Is it more efficient to use RR or Confederation?
If option A is 2% more "efficient" than option B, but takes 10% longer to
deploy and causes 3% more SLA payouts to your customers when the added
complexity causes a whoopsie, how much more work could you have gotten done in
the time you spent in an uncomfortable meeting explaining to upper management
why the whoopsie happened?
(Sorry, it's been that sort of week 
Le 12/06/2014 18:39, Valdis.Kletnieks@vt.edu a �crit :
need some guidance on best practices
What the vendor says is best practices, or what people in the trenches
say?
Is it more efficient to use RR or Confederation?
If option A is 2% more "efficient" than option B, but takes 10% longer to
deploy and causes 3% more SLA payouts to your customers when the added
complexity causes a whoopsie, how much more work could you have gotten
done in
the time you spent in an uncomfortable meeting explaining to upper
management
why the whoopsie happened?
(Sorry, it's been that sort of week
Now, Philip, I think along the same path as Vladis: it depends... What does
your physical or layer 2 network look like? How do you expect packets to
move around inside, and in and out, of that topology? You need policing?
How much and of what, etc, etc...?
I'm quite often a fan of confed's, if the network is young thus ``easy''
migration, but there are scenarios... Please provide more detail to this
mail
thread or one-to-one if you prefer.
Cheers,
mh
I guess my question is (sorry MPLS speak ahead) with 4 PE's on the edge running MP-BGP and ISIS & 4 P's in the core running ISIS, is it best practice to confederate or use a route reflector and make the PE's clients.
Basically I want to know what an ISP would do, not a test in a LAB.
need some guidance on best practices
What the vendor says is best practices, or what people in the trenches
say?
Is it more efficient to use RR or Confederation?
If option A is 2% more "efficient" than option B, but takes 10% longer to
deploy and causes 3% more SLA payouts to your customers when the added
complexity causes a whoopsie, how much more work could you have gotten
done in
the time you spent in an uncomfortable meeting explaining to upper
management
why the whoopsie happened?
(Sorry, it's been that sort of week
Now, Philip, I think along the same path as Vladis: it depends... What does
your physical or layer 2 network look like? How do you expect packets to
move around inside, and in and out, of that topology? You need policing?
How much and of what, etc, etc...?
I'm quite often a fan of confed's, if the network is young thus ``easy''
migration, but there are scenarios... Please provide more detail to this
mail
thread or one-to-one if you prefer.
Cheers,
mh
One data point that you may find useful: If you find out later that you’ve
chosen incorrectly the first time around, it is FAR easier to change
*from* RRs *to* Confeds than it is to do the opposite. The AS migration
tools that you’d normally use to handle moving routers from one ASN to
another don’t work to migrate routers from a confed ASN to a normal iBGP
ASN setup, probably because the BGP machinery doesn’t know what to do with
the union of the changes those things make to BGP’s default behavior, so
you’re stuck with trying to find the least bad flag day way to handle
renumbering ASNs out of a confed. Doing it without major traffic impact is
pretty difficult since most of the options involve nuking BGP and
rebuilding it to punt routers from one ASN to another, and doing this on
multiple routers simultaneously in order to minimize the time when BGP is
offline on multiple devices due to ASN mismatches. Size of network of
course matters when considering whether this is really a potential issue
for you, but since you’re asking in terms of what an ISP would do vs what
works in a lab, considering large scale rather than today’s scale when
determining the exit strategy is pretty important.
Wes George
Anything below this line has been added by my company’s mail server, I
have no control over it.
Le 18/06/2014 18:31, Philip Lavine a �crit :
I guess my question is (sorry MPLS speak ahead)
No harm, me I've always rather consifered MPLS as a service provider
(like VPN, etc).
with 4 PE's on the edge running MP-BGP and ISIS & 4 P's in the
core running ISIS, is it best practice to confederate or use a route
reflector and make the PE's clients.
MP-BGP for VPN, I guess? Or am I missing something in your case? If so,
you use MPLS for services, right? Where
do you hook up to 'the Internet'?
This aside, I'd go the confederation way (only?) in case I see a
potential future need to do amounts of by destination
routing also within my network. I'd find it nicer than rushing down the
RSVP lane (pending SR :-)) Makes some sense
to you?
Basically I want to know what an ISP would do, not a test in a LAB.
Me, rarely had a lab for these kind of things, but quite often networks
Cheers,
mh
Route reflector.
Mark.