Hi Roman,
 
Most ISPs would use BGP and typically it would look like this:
 
ISP-----iBGP_AS100-----ISP
  |                                     |
  |                                     |
eBGP                          eBGP
  |                                     |
  |                                     |
CSR--iBGP_AS65532--CSR
Regards,
Fadi
 
On Fri, Nov 2, 2012 at 9:56 AM, Roman Hochuli <roman.hochuli@nexellent.ch> wrote:
Hey All

Quick question: do you allow/run routing protocols between your (isp-)
network and your customer?
If so: which protocols?
If not: what reasons do you tell the customer?


In particular I am interested to know about setups when they want to
announce the prefix/subnet you assigned them from your PA-space back to
you because they want to run redundant routers.

The setup would probably look like this:

                   Customer Subnet 10.0.0.0/27
         /                                             \
         |                                             |
[customer router a]  - <routing protocol x> - [customer router b]
         |                                             |
<routing protocol y>                          <routing protocol y>
         |                                             |
[isp router a]       - <routing protocol z> - [isp router b]
         |                                             |
         \                                             /
                     ISP Network 10.0.0.0/8

--
Best regards,
Roman Hochuli
Operations Manager

nexellent ag
Saegereistrasse 33
CH-8152 Glattbrugg

Phone:       +41 44 872 20 00
Fax:         +41 44 872 20 01
URL:         www.nexellent.ch
X-NCC-RegID: ch.nexellent

Imagination is the one weapon in the war
against reality.
                    -- Jules de Gaultier


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