Cnange next-hop

[Alexander Shikov]

Hi,

continuing the implemetation of blackhole in our IXP, I've faced with problem of 
changing next-hop for the route.

Construction looks like

if (net.len = 32 && bgp_community ~ [ (31210,*) ] && bgp_community ~ [ (0,666) ] ) then {
	gw = 193.25.181.253;
	return true;
}

results in :

bird> show route for 95.67.13.2/32 all 
95.67.13.2/32      via 193.25.181.253 on bge0 [COSMONOVA2 2014-04-04 17:59:19 from 193.25.180.133] * (50) [AS34867i]
        Type: BGP unicast univ
        BGP.origin: IGP
        BGP.as_path: 34867
        BGP.next_hop: 193.25.180.133
        BGP.local_pref: 100
        BGP.community: (0,666) (31210,31210)


And when this route is announced to other peer, next-hop remains unchanged:

Peerings.inet.0: 16708 destinations, 50556 routes (16627 active, 0 holddown, 88 hidden)
+ = Active Route, - = Last Active, * = Both

95.67.13.2/32      *[BGP/170] 00:12:14, localpref 100, from 193.25.180.255
                      AS path: 34867 I
                    > to 193.25.180.133 via xe-1/0/0.777

As far as I understand from User's Guide, gw is an read-write attribute,
so why it didn't change next-hop?

Thanks in advance!

-- 
Alexander Shikov
Technical Staff, Digital Telecom IX
Tel.: +380 44 201 14 07
http://dtel-ix.net/