Can the same
AS number be used by an organization at two different sites to peer with two
different ISPs?
The
scenario is as per what is shown below:
ASN
1111-a (100.100.100.0/24)---ASN XXX---ASN YYY---ASN 1111-b (200.200.200.0/24)
The
AS number is 1111. The organization using it at location A to advertise network
100.100.100.0/24 to the ISP peer. At location B the organization is is using
the same ASN to advertise 200.200.200.0/24 to another ISP. There is no peering
between the two AS 1111 routers as they are physically separated.
Will
this work?
Some Notes:
You need to advertise separate public ip address blocks out of the
two sites.
If you try to advertise something more specific that a /24 you
may have problems with summarization of your routes at the ISP level.
So it can work in real world if you have at least two /24 public ip
address blocks registered with your AS number
Without knowing the details of the remote site routes it is
difficult to say what is happening when something goes wrong.
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