Prepend only default route 0.0.0.0/0

[Crowley262]

I thought this would work to prepend only the default route 0.0.0.0/0 but it ended up prepending everything. On an IOS XR platform 

conf t
!
prefix-set PREPEND_CUST
0.0.0.0/0
end-set
!
route-policy CUST_PREPEND_AS
if destination in PREPEND_CUST then
prepend as-path most-recent 4
else
pass
endif
end-policy
!

Set this on the bgp route-policy outbound 

Any help is appreciated, thanks

[Georg Pauwen]

Hello,

I somewhere recall the the below syntax is possible as well, can you give that a try ?

route-policy CUST_PREPEND_AS
if destination in (0.0.0.0/0) then
prepend as-path most-recent 4
else
pass
endif
end-policy

[paul driver]

Hello

May i ask why is there a requirement to prepend a default route, can you elaborate on your topology a little bit more if applicable.

[Crowley262]

Customer would like to prefer a default route from another network they have. Use this one as secondary for internet traffic.

[Crowley262]

I opened a Cisco TAC case on this and this is what they provided as a solution. He showed me it working in the LAB environment. Just an FYI

prefix-set XXXX
0.0.0.0/0
end-set

route-policy PASS
if destination in XXXX then
prepend as-path 12345 4
else
pass
endif
end-policy