Hi
It looks like GoBGP installs VPNv4 routes learned from a route-reflector into
Linux kernel's default forwarding table via FRR/Zebra.
[ashaikh@vsp-vpe-west ~]$ gobgp global rib -a vpnv4
Network Labels Next Hop AS_PATH
Age Attrs
*> 100:2:172.16.0.1/32 [145] 192.168.10.3 65003
00:04:48 [{Origin: i} {Med: 0} {LocalPref: 100} {Originator: 192.168.0.3}
{ClusterList: [192.168.0.2]} {Extcomms: [100:2]}]
*> 100:2:192.168.101.0/24 [145] 192.168.10.3 65003
00:04:48 [{Origin: i} {Med: 0} {LocalPref: 100} {Originator: 192.168.0.3}
{ClusterList: [192.168.0.2]} {Extcomms: [100:2]}]
No VRF is configured with RT 100:2 on gobgp.
[ashaikh@vsp-vpe-west ~]$ gobgp vrf
Name RD Import RT Export RT
ID
blue 100:1 100:1 100:1
6
Note blue VRF's RT are different from the RT of the routes above. Thus, gobgp
daemon does not have a VRF to import these routes into, so it seems to be
installing these routes as IPv4 routes through Zebra. Here's what vtysh shows
for routes in Zebra's RIB:
vsp-vpe-west# show ip route
Codes: K - kernel route, C - connected, S - static, R - RIP,
O - OSPF, I - IS-IS, B - BGP, P - PIM, E - EIGRP, N - NHRP,
T - Table, v - VNC, V - VNC-Direct, A - Babel, D - SHARP,
> - selected route, * - FIB route
B> 172.16.0.1/32 [200/0] via 192.168.10.3 (recursive), 00:07:14
* via 10.202.0.8, ens8, label 17, 00:07:14
...<snip>...
O>* 192.168.10.3/32 [110/2] via 10.202.0.8, ens8, label 17, 1d02h12m
B> 192.168.101.0/24 [200/0] via 192.168.10.3 (recursive), 00:07:14
* via 10.202.0.8, ens8, label 17, 00:07:14
Zebra then installs these routes into the Linux kernel's default forwarding
table.
[ashaikh@vsp-vpe-west ~]$ ip route show
...<snip>...
172.16.0.1 encap mpls 17 via 10.202.0.8 dev ens8 proto 186 metric 20
...<snip>...
192.168.101.0/24 encap mpls 17 via 10.202.0.8 dev ens8 proto 186 metric 20
In my opinion this is a bug. Received VPNv4 routes should not be passed to
FRR/Zebra irrespective of whether there is a VRF for importing routes into or
not.
thx
aman
------------------------------------------------------------------------------
Check out the vibrant tech community on one of the world's most
engaging tech sites, Slashdot.org! http://sdm.link/slashdot
_______________________________________________
gobgp-devel mailing list
gobgp-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/gobgp-devel
