ā09-14-2010 12:51 AM - edited ā03-06-2019 12:57 PM
Hi there. I need some help with my issue.
This is the input data for this task:
We have one AS, for example, XXXX, and one subnet X.X.X.X , one router with BGP support. It is configured with two active sessions with two ISPs.
Because of the separation of companies, we have obtaibed new AS YYYY and new IP Y.Y.Y.Y subnet. Now we have to migrate our services from old AS to new AS. Our used hardware is one Cisco 7304.
Additionally we have another one Cisco 7304, wich not configured yet, i think we must use it for this migration.
Can anybody suggest, how can we easiest do this?
ā09-14-2010 01:01 AM
You will still have multihoming topology?
New AS and new subnet - are your registered objects in RIR (perhaps,RIPE) ?
ā09-14-2010 01:06 AM
Yes, we will still have multihoming topology. We have to connect at least one more ISP for this.
Now we have new registered objects (AS and IP subnet), obtained by RIPE.
ā09-14-2010 02:01 AM
Perhaps, if multihoming policy, that you used previously, fits your needs then
you can simply take old config (bgp part) and use it in new environment.
Just correct ASN number, advertised network, new p2p net addresses for peering, acquired from your ISPs, policies (if used) and filtering (depends on what you used before: prefix-lists or as-path lists).
ā09-14-2010 07:53 AM
The major problem is that the old AS continues to work, and in parallel we have to run new AS and transfer services to new IP adresses on new environment.
ā09-14-2010 08:37 AM
Is the old subnet still in use? Are you going to migrate services from old subnet to new subnet? if yes then you could run both new and old AS with subnets advertised while you migrate services to new!!
The other option is you could use both ASs. For example you could reconfigure the local BGP speakers to use new AS number but advertise the old AS in BGP OPEN messages and BGP updates until you finish migrating to the new AS.
The "local-as
Francisco
Hope to help
ā09-14-2010 10:52 PM
francisco_1 wrote:
Is the old subnet still in use?
Yes, the old subnet still in use and it will be in use after this migration. Each of our companies will have its own individual AS as a result.
francisco_1 wrote:
Are you going to migrate services from old subnet to new subnet?
Yes we are going to migrate from old subnet to new one.
francisco_1 wrote:
The "local-as
Yes, I can only see this way to migrate, I wanted to get a confirmation that this is the most correct way.
Thanks to all for help. Now i need to create test model of the migration, for example, on the "Dynamips", and test it.
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