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Hardware :Dell PowerEdge R630- CPU - CPU E5-2697 v4 , 250GB RAM, 2TB HDD, 1 Network Interface
EVE-NG Running on - Inside ESXI (v6.7)
VT-X - Enabled
promiscuous mode enabled

images:

L2/3 SW: i86bi_linux_l2-adventerprisek9-ms.SSA.high_iron_20190423.bin and i86bi_LinuxL2-AdvEnterpriseK9-M_152_May_2018.bin
Routers: i86bi_LinuxL3-AdvEnterpriseK9-M2_157_3_May_2018.bin , L3-ADVENTERPRISEK9-M-15.4-2T.bin

A simple topology, with one switches and 2 routers.
Router 1 interface e0/1 is connected to Switch 1 interface e0/1.
Router 2 interface e0/2 is connected to Switch 2 interface e0/2.


Sw1 config:


interface Ethernet0/1
switchport access vlan 10
switchport mode access
!
interface Ethernet0/2
switchport access vlan 10
switchport mode access
!
vlan 10
name vlan-10


R1 config:

interface Ethernet0/1.10
encapsutation dot1q 10
ip address 10.10.10.1 255.255.255.0
!

R2 config:

interface Ethernet0/1.10
encapsutation dot1q 10
ip address 10.10.10.2 255.255.255.0
!


R1 cannot ping R2.

arp shows incomplete.
disabled cef, same result.

Tried also with Nexus Switch and same result.

ports on switch must be in trunk mode not access
then dot1q will work

Thanks Uldis(UD). It worked!