Sipser,
And there's where the problem exists, same broadcast domain with same Mac address. Would you be able to use a separate physical interface for each VRF? or at least separate the sub interfaces on a another physical interface. Sub interfaces inherit the mac address from the physical interface and since you are landing on the same broadcast domain you will get the same mac-address on the same vlan.
Here is my research.
Known facts: We are not able to change sub interface mac address.
1) I Plugged interface g0/0 and g0/1 of a router into the same Vlan 1 of a switch, and only one of interface will obtain and IP Address. This is because they are on the same domain and 2 interface can not have the same subnet without a VRF setup.
2) I Created SITE1, and SITE2 VRF into two separate interface G0/0 G0/1 or could be sub interfaces as long as they are on a separate physical interface, and landing on the same vlan of the switch. Both Received an IP address from the same subnet DHCP(vlan1).
3) This won't work with they are sub interface with different VRF on the same physical interface, this is due to the fact you are landing on the same broadcast domain, basically you are separating the layer three on the router but no the layer 2 on the switch which depend on mac addresses
From Switch VIEW.
SW0-MAT#show cdp neighbors
Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone
Device ID Local Intrfce Holdtme Capability Platform Port ID
RIKEV2.edwinmatos.rocks
Fas 0/9 139 R B S I CISCO1941/Gig 0/0
RIKEV2.edwinmatos.rocks
Fas 0/4 151 R B S I CISCO1941/Gig 0/1
TO ROUTER
RIKEV2#show vrf
Name Default RD Protocols Interfaces
SITE1 101:101 ipv4 Gi0/0
SITE2 102:102 ipv4 Gi0/1
RIKEV2#show ip interface brief
Interface IP-Address OK? Method Status Protocol
Embedded-Service-Engine0/0 192.168.29.1 YES NVRAM initializing down
GigabitEthernet0/0 192.168.28.140 YES manual up up
GigabitEthernet0/1 192.168.28.141 YES manual up up
Back to Switch
SW0-MAT#ping 192.168.28.140
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.28.140, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/3/4 ms
SW0-MAT#ping 192.168.28.141
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.28.141, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 4/4/4 ms
SW0-MAT#
