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Beginner

How to configure Multiple AS numbers in single BGP instance

HI

Our current set up is two links (Primary and Secondary)  with single ISP, running BGP with private AS number (Two Byte ASN). We have 100 IPs now.

We are taking Provider independant IP SPACE from APNIC (/24 range). Public and 4 Byte AS number.

This IP SPACE will be published (advertisesd) via Two ISPs.)

How will I configure advertising the existing 100 IPs via my new public AS Number. I require these 100 IPs for some times till I complete renumbering all servers and completing DNS entries.

How can I achieve advertising networks from multiple AS numbers, (1 Public and 1 Private).

Thanks.

2 REPLIES 2
Advisor

How to configure Multiple AS numbers in single BGP instance

If you have AS 1 with provider 1 and AS 2 with provider 2, you should be able to do something like this:

router bgp 1

neighb 192.168.1.1 remote 1559

neighbor 192.168.2.2 local-as 2

neighbor 192.168.2.2 remote 2559

The provider at 192.168.2.2 will see you coming from AS 2. This is usually used as a transition only and not recommended for full time use.

HTH,

John

HTH, John *** Please rate all useful posts ***
Beginner

How to configure Multiple AS numbers in single BGP instance

Thanks a lot John.

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