[195937] in North American Network Operators' Group
Re: IPv6 migration steps for mid-scale isp
daemon@ATHENA.MIT.EDU (Owen DeLong)
Sat Sep 23 03:22:49 2017
X-Original-To: nanog@nanog.org
From: Owen DeLong <owen@delong.com>
In-Reply-To: <CAADjeEiW_1kXqNtaBt7MNFjXkXhT_jLWPznR3ha4hvD_24RFFw@mail.gmail.com>
Date: Wed, 20 Sep 2017 12:04:45 -0300
To: Ahad Aboss <ahad@swiftelnetworks.com>
Cc: nanog@nanog.org
Errors-To: nanog-bounces@nanog.org
> On Sep 17, 2017, at 5:14 AM, Ahad Aboss <ahad@swiftelnetworks.com> =
wrote:
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> Hi Fredrik,
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> Running two different IGPs for IPv4 and IPv6 is a recipe for disaster =
even
> if it=E2=80=99s a short-term goal.
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> Here are a few things to consider;
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> OSPF is good for small ISPs with small routing tables (10 to 15K =
routes).
> It will support more routes but configuration of your network becomes =
more
> complex hence an increase in human error (network engineers)
Another perfectly workable alternative is to divide your network up into =
OSPF
instances which each have an internal ASN and linking them together with =
BGP.
> EIGRP is more suitable for mid-size say 50K subscriber base but you =
are
> really stretching your luck if you go beyond the 50K subscriber base.
You also have the problem that EIGRP locks you into an all-Cisco =
network.
> EIGRP is more susceptible to flap when adding a new device with an MTU
> mis-match etc. You can google up some stories about EIGRP flap =
issues=E2=80=A6.
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> My recommendation is to use iBGP for both IPv4/IPv6, you can use OSPF =
or
> EIGRP for link layer connectivity and iBGP to carry the traffic.
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> I prefer OSPF over EIGRP because of its equal cost load balancing if =
you
> have multiple interfaces from PE devices to your core.
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> iBGP is scalable, you can introduce router reflectors to avoid full =
mesh
> peering between PE routers =E2=80=93 and the sky if your limit!
I think in general most serious networks consider this a question of =
OSPF
vs. ISIS for IGP and BGP is the only choice for EGP.
I find it interesting that you don=E2=80=99t even mention ISIS in your =
discussion.
I don=E2=80=99t know of any substantial networks running EIGRP these =
days. I=E2=80=99m not
saying they don=E2=80=99t exist, but they are certainly rare exceptions.
Owen
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> Hope this helps
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>=20
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> Thanks
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> Ahad
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>=20
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> On Sat, Sep 16, 2017 at 6:09 PM, Fredrik Sallinen <
> fredrik.sallinen@gmail.com> wrote:
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>> Thank you all for your Ideas. AFAIK one of the main decisions for =
IPv6
>> transition and deployment is the choice of IPv6 IGP. I read somewhere
>> that its a good practice to use different IGP protocol for IPv6 and
>> IPv4. For example if IGP for IPv4 is IS-IS then use OSPFv3 for IPv6.
>> any comments on this?
>> Additionally I will appreciate it if you share your suggestions on
>> products and their performance? For example If I go for NAT64+DNS64 =
to
>> handle IPv4 traffic, What sort of carrier grade products are you
>> recommending and can you share your experience on their
>> performance/pitfalls? currently we have ~150Gbps of IPv4 traffic, so
>> we need a solution to
>> support such scale and future growth.
>>=20
>>=20
>> Regards,
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>> On Thu, Sep 14, 2017 at 9:35 PM, Mikael Abrahamsson =
<swmike@swm.pp.se>
>> wrote:
>>> On Wed, 13 Sep 2017, Fredrik Sallinen wrote:
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>>>> Hello,
>>>>=20
>>>> Recently we have decided to start IPv6 migration in our network. We
>>>> have ~1K BNGs and connecting our customers to network using PPPoE.
>>>> I'd be interested in hearing from the technical community about =
their
>>>> experiences and recommendations on this process. I'm wondering:
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>>>> Shall I go for IPv6-only deployment or dual stack?
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>>>=20
>>> For PPPoE with existing IPv4, go dual stack.
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>>>> Where to start with IPv6? (core, edge or ...)
>>>=20
>>>=20
>>> Core, peering, work outwards towards end users.
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>>>> What are the best practices for ISPs?
>>>> What are the costs and return on investment?
>>>> How to identify address CPE and legacy application issues?
>>>=20
>>>=20
>>> There is a lot written and presented about IPv6 deployment. People =
have
>> been
>>> doing this in volume since around 2010, and if you search for IPv6
>>> deployment experience you'll find lots of presentations.
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>>> Some I found that seem relevant:
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>>> https://www.nanog.org/meetings/nanog51/presentations/Monday/aronson-
>> pierantozzi-level3-ipv6.pdf
>>> https://www.ietf.org/proceedings/54/slides/plenary-15.pdf
>>> https://www.apnic.net/community/ipv6-program/ipv6-stories/
>>> https://www.ipv6council.be/experiences-de-deploiements-ipv6/
>>>=20
>>> If you prefer video form, there are lots of presentations from
>> conferences,
>>> available on youtube as well.
>>>=20
>>> --
>>> Mikael Abrahamsson email: swmike@swm.pp.se
>>=20
