Topic: export route BGP by status neighbor?

[soundbear]

Hi all,

Please help me resolve this case:

................R3
...............// (link 1)
..R1 === R2
...............\\ (link 2)
................R4


R1, R2 ins AS1.
R3 in AS2.
R4 in AS3
R1 advertise 4 prefixs: 10.0.0/24, 10.0.1/24, 10.0.2/24, 10.0.3/24 to R2, and R2 adverties them to R3, R4

My system has 2 link IXP to internet, but bandwidth is very low. So if 1 in 2 link DOWN, I don't want to advertise full route to IXP AS:
+ If both of 2 link 1 & 2 UP, RT2 will advertise 4 prefixs from RT1 (10.0.0/24-10.0.3/24)to RT3 & RT4
+ If link 1 or link 2 DOWN, RT2 just advertises only 1 prefix (10.0.3.0/24) to another AS.

My device is MX80 (Juniper JUNOS 10.2R4..
I can't find any policy to do this. Please let share to me.

Thanks

[screenie.]

Don't think it can be done with policies. Look into eventscripting!.

[soundbear]

:d i found it.
Use policy with condition : if-route-exits. This solution likes Cisco 's "advertise map".
Some guys recommend me use "event script", but it's so hard with me, i don't know about script by Perl, C.
Any body know clearly about this?please share with me
Thanks