BGP and anycast

Tue Jan 30 00:17:50 UTC 2001

How does one announce the same net (with the same
origin AS) from different places on the Internet? Or
should the "anycast" networks be announced from
different origin AS:es?
(Can't find "anycast" setup in my BGP for Dummies<tm>)

----------------------------------------
AS12345
IGP
(announces net 1.2.3/24 among others)
Connected to several major networks (P, Q, W, Z)
----------------------------------------
Isolated* site 1 (one unique routable net and
1.2.3/24)
Router connected to a major network X, announced as
AS12345
----------------------------------------
Isolated* site 2 (one unique routable net and
1.2.3/24)
Router connected to a major network Y, announced as
AS12345
----------------------------------------
* Isolated - No contact to main AS via IGP, tunnels or
telepathy

So when communicating among the sites (doing zone
transfers etc) I use the unique routable network...
piece of ca...
...but won't my BGP routers at the different locations
be a bit puzzled when they see the announcements from
another AS12345 for my unique networks (and more so
for the anycast)?
The config above does seem to break the concept of an
AS.

Feel free to bash my Yahoo mail if this post is
utterly stupid or seems way out of scope
/Swede - still among the clueless – aka Anders Plym,
presently without *real* mail access

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