EVE-NG gateway via Cloud0 not reachable    

If a ping to a gateway outside of vmware doesn't work and you're sure that the promiscuous/forged mode in the virtual switch in vSphere is configured correctly, i.e.

router10.0.35.20---Cloud0-EVENG10.0.35.5-----LABSWITCH---LABROUTER(Arista with virtual-router 10.0.35.1)

Router#show arp
Protocol  Address          Age (min)  Hardware Addr   Type   Interface
Internet  10.0.35.19              -   aabb.cc00.3d00  ARPA   Ethernet0/0
Router#ping 10.0.35.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.0.35.1, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)

ping from router to 10.0.35.1 doesn't work then do a ping towards the real IP 10.0.35.3.

Router#ping 10.0.35.3
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.0.35.3, timeout is 2 seconds:
.!!!!

This will populate the ARP table on the router with 10.0.35.1 also for some reaso

Router#show arp
Protocol  Address          Age (min)  Hardware Addr   Type   Interface
Internet  10.0.35.1               0   001c.7300.0099  ARPA   Ethernet0/0
Internet  10.0.35.3               0   444c.a869.07dd  ARPA   Ethernet0/0
Internet  10.0.35.19              -   aabb.cc00.3d00  ARPA   Ethernet0/0

and then ping to 10.0.35.1 will work

Router#ping 10.0.35.1 
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.0.35.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/1 ms