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They’re called
Routing Instances (VRFs), but they
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AREN’T virtual
routers. JunOs has virtual routers
in 6.1
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2547 vpns have
only one iBGP. What happens is that
a
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Route Identifier
and Target bgp communities are added,
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putting routes
into separate tables. IGP remains
same.
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The catch is that
interfaces need to be in one VRF or
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another. They can’t be in multiples. There are tricky
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workarounds with
next-table policies, but they didn’t work
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well in our
situation. Customers don’t know
about 2547.
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So since we ebgp
with everyone, we establish second
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peerings with ISP
customers. A nuisance but it works.
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