[c-nsp] IOS-XR Nested Route Policy

[Arthur Liew]

Dear Guys,

I would like to implement a nested routing policy in IOS-XR within our
network. Sample policy at the bottom of email.

We have the following versions in our network

IOS-XR 3.9.2

IOS-XR 4.2.0
IOS-XR 5.2.0

I am just wondering if anyone of you have ever implemented this & do share
with me if there's any issues faced or comments for different versions of
IOS-XR.

Cheers !

Rgds
Arthur

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route-policy BGP-IN-ISP

 apply BGP-IN-BASE-POLICY

 if as-path in isp-as-path-in-permit then

    set community isp-routes

    set local-preference 100

    pass

  else

    drop

  endif

end-policy

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route-policy BGP-OUT-ISP

  apply BGP-OUT-BASE-POLICY

  pass

end-policy

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route-policy BGP-IN-BASE-POLICY

 # Repetitive route processing required in all peering

 if destination in bogon-ipv4-deny

     drop

 elseif destination in prefixsize-ipv4-permit then

    pass

 else

     drop

 endif

end-policy


---------------------------------------------------

 route-policy BGP-OUT-BASE-POLICY

 # Repetitive route processing required in all peering

 if (destination in isp-own-ipv4 or as-path in METRO_E) and (destination in
prefixsize-ipv4-permit) then

     pass

 else

     drop

 endif

end-policy