FRR EVPN VXLAN ROUTE SHOW

root@dev57:/home/admin# ip -d route show vrf vrf1
unicast 9.9.9.0/24 via 10.10.18.212 dev br100 proto bgp scope global metric 20 onlink 
unicast 10.1.1.0/24 dev br10 proto kernel scope link src 10.1.1.1 
unicast 20.1.1.0/24 dev br20 proto kernel scope link src 20.1.1.1 

root@dev57:/home/admin# ip -d nei show vrf vrf1
20.1.1.2 dev br20 lladdr 00:00:00:00:00:02 STALE
10.10.18.212 dev br100 lladdr 00:00:64:00:00:02 extern_learn  NOARP
10.1.1.2 dev br10 lladdr 00:00:00:00:00:01 STALE
fe80::200:ff:fe00:3 dev br10 lladdr 00:00:00:00:00:03 extern_learn  NOARP
fe80::200:ff:fe00:1 dev br10 lladdr 00:00:00:00:00:01 STALE
fe80::200:ff:fe00:2 dev br20 lladdr 00:00:00:00:00:02 STALE


dev57# show ip route vrf vrf1 
Codes: K - kernel route, C - connected, S - static, R - RIP,
       O - OSPF, I - IS-IS, B - BGP, E - EIGRP, N - NHRP,
       T - Table, v - VNC, V - VNC-Direct, A - Babel, D - SHARP,
       F - PBR, f - OpenFabric,
       > - selected route, * - FIB route, q - queued route, r - rejected route


VRF vrf1:
B>* 9.9.9.0/24 [20/0] via 10.10.18.212, br100 onlink, 1d17h04m
C>* 10.1.1.0/24 is directly connected, br10, 01w4d20h
C>* 20.1.1.0/24 is directly connected, br20, 01w5d00h

 隧道之间不用直连的路由相连而是通过网段1.1.1.1 到 2.2.2.2，看下bgp evpn同步的路由是什么样子：

dev57# show ip route vrf vrf1
Codes: K - kernel route, C - connected, S - static, R - RIP,
       O - OSPF, I - IS-IS, B - BGP, E - EIGRP, N - NHRP,
       T - Table, v - VNC, V - VNC-Direct, A - Babel, D - SHARP,
       F - PBR, f - OpenFabric,
       > - selected route, * - FIB route, q - queued route, r - rejected route


VRF vrf1:
B>* 9.9.9.0/24 [20/0] via 2.2.2.2, br222 onlink, 00:00:52
C>* 10.1.1.0/24 is directly connected, br10, 01w5d00h
C>* 20.1.1.0/24 is directly connected, br20, 01w5d05h
C>* 22.1.1.0/24 is directly connected, br22, 00:01:54

root@dev57:/home/admin# ip -d route show vrf vrf1
unicast 9.9.9.0/24 via 2.2.2.2 dev br222 proto bgp scope global metric 20 onlink 
unicast 10.1.1.0/24 dev br10 proto kernel scope link src 10.1.1.1 
unicast 20.1.1.0/24 dev br20 proto kernel scope link src 20.1.1.1 
unicast 22.1.1.0/24 dev br22 proto kernel scope link src 22.1.1.1

dev57# show evpn next-hops vni all 

VNI 222 #Next-Hops 1

IP              RMAC             
2.2.2.2         00:22:22:00:00:02

可以看到bgp evpn同步过来的路由的nexthop是远端vtep的IP。

root@dev57:/home/admin# ip -d nei show vrf vrf1
20.1.1.2 dev br20 lladdr 00:00:00:00:00:02 STALE
2.2.2.2 dev br222 lladdr 00:22:22:00:00:02 extern_learn  NOARP
10.1.1.2 dev br10 lladdr 00:00:00:00:00:01 STALE
fe80::200:ff:fe00:1 dev br10 lladdr 00:00:00:00:00:01 STALE
fe80::200:ff:fe00:2 dev br20 lladdr 00:00:00:00:00:02 STALE


root@dev57:/home/admin# bridge fdb show|grep 00:22:22:00:00:02
00:22:22:00:00:02 dev vxlan222 vlan 1 extern_learn master br222 
00:22:22:00:00:02 dev vxlan222 extern_learn master br222 
00:22:22:00:00:02 dev vxlan222 dst 2.2.2.2 self extern_learn 

FRR内部其实把vtep 2.2.2.2 当作是L3 VNI的neighbor，这么做不得不说很是巧妙。