Hello Bird Users,
I am trying to implement RTBH (Remotely Triggered Black Hole) in below setup:
0.Simplified Topology:
* ebgp fabric
* inside fabric we use only IPv6, so we announce IPv4 blocks with IPv6 next
hop (extended next hop)
* tor --- leaf --- spine---3xstem(3xborder_leaf) --- border
* tor announces 192.168.66.1/32 tagged with (65535,666) up to border
1.Border has static route:
r04.border01.labkrk05.fab> show route for 23.0.0.255
23.0.0.255/32 blackhole [DISCARD_ROUTE_v4 2024-01-08] * (200)
2.Border learns 192.168.66.1/32. In import filter I change next hop to
23.0.0.255 to blackhole traffic to 192.168.66.1/32.
I don’t see this change in “show route” but I see this in “show route all”
Can you give me a tip how to change eBGP next hop in this scenario and resolve
it recursively via static route?
r04.border01.labkrk05.fab> show route for 192.168.66.1/32
Executing "/usr/sbin/birdc show route for 192.168.66.1/32"
Table master4:
192.168.66.1/32 unicast [fc00:5:1:502::1__r01.stem01.la 09:24:07.174] *
(100) [AS4290000010i]
via fc00:5:1:502::1 on ae201
unicast [fc00:5:1:503::1__r02.stem01.la 09:24:07.174]
(100) [AS4290000010i]
via fc00:5:1:503::1 on ae202
unicast [fc00:5:1:504::1__r03.stem01.la 09:24:07.172]
(100) [AS4290000010i]
via fc00:5:1:504::1 on ae203
r04.border01.labkrk05.fab> show route for 192.168.66.1/32 all
192.168.66.1/32 unicast [fc00:5:1:502::1__r01.stem01.la 09:24:07.174] *
(100) [AS4290000010i]
via fc00:5:1:502::1 on ae201
Type: BGP univ
BGP.origin: IGP
BGP.as_path: 4290000004 4290000005 4290000008 4290000010
BGP.next_hop: 23.0.0.255
BGP.local_pref: 100
BGP.community: (65535,666)
unicast [fc00:5:1:503::1__r02.stem01.la 09:24:07.174]
(100) [AS4290000010i]
via fc00:5:1:503::1 on ae202
Type: BGP univ
BGP.origin: IGP
BGP.as_path: 4290000004 4290000006 4290000008 4290000010
BGP.next_hop: 23.0.0.255
BGP.local_pref: 100
BGP.community: (65535,666)
unicast [fc00:5:1:504::1__r03.stem01.la 09:24:07.172]
(100) [AS4290000010i]
via fc00:5:1:504::1 on ae203
Type: BGP univ
BGP.origin: IGP
BGP.as_path: 4290000004 4290000007 4290000008 4290000010
BGP.next_hop: 23.0.0.255
BGP.local_pref: 100
BGP.community: (65535,666)
Regards,
Dariusz
