Hi
I have noticed that GoBGP is assigning MPLS label of zero to all VPNv4 routes
that are imported from VRF RIBs into the default RIB.
In my testbed, I have a PE (vsp-west-pe) connected to two CEs in two different
VRFs named 'blue' and 'red'. Each CE sends a route to the PE for prefix
192.168.0.0/24.
Here's the RIB for blue VRF on vsp-west-pe:
[ashaikh@vsp-vpe-west ~]$ gobgp vrf blue rib
Network Next Hop AS_PATH Age
Attrs
192.168.0.0/24 10.200.0.2 65001 00:51:30
[{Origin: i} {Med: 0}]
Similarly, here's the RIB for red VRF:
[ashaikh@vsp-vpe-west ~]$ gobgp vrf red rib
Network Next Hop AS_PATH Age
Attrs
192.168.0.0/24 10.201.0.3 65003 00:52:22
[{Origin: i} {Med: 0}]
Finally, here's the list of VPNv4 routes in the default RIB:
[ashaikh@vsp-vpe-west ~]$ gobgp global rib -a vpnv4
Network Labels Next Hop AS_PATH
Age Attrs
*> 100:1:192.168.0.0/24 [0] 10.200.0.2 65001
00:53:05 [{Origin: i} {Med: 0} {Extcomms: [100:1]}]
*> 100:2:192.168.0.0/24 [0] 10.201.0.3 65003
00:53:05 [{Origin: i} {Med: 0} {Extcomms: [100:2]}]
As you can see the label stack for each route has a single label whose value is
zero.
thx
aman
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