OK I think I know the answer to this question but would be good to have confirmation.
I have a ISR4331 running XE 16.12.05 with an NIM-ES2-8-P etherswitch module installed.
The switch module has a couple of vlans which I want to trunk over fibre to another switch in the site via one of the router interfaces Gi0/0/0 ot Gi0/0/2 using the SFP port.
It seems that this 'could' be possible using bridge domains but there seems to be a limitation that the router bridge domain and the etherswitch vlan are not connected.
Config snippet
bridge-domain 100
bridge-domain 200
!
interface GigabitEthernet0/0/0
no ip address
media-type sfp
negotiation auto
service instance 100 ethernet
encapsulation dot1q 100
bridge-domain 100
!
service instance 200 ethernet
encapsulation dot1q 200
bridge-domain 200
!
interface GigabitEthernet0/1/2
switchport access vlan 100
switchport mode access
spanning-tree portfast
!
interface Vlan100
ip address 192.169.100.200 255.255.255.0
!
interface BDI100
no ip address
encapsulation dot1Q 100
!
interface BDI200
ip address 172.21.100.20 255.255.255.0
encapsulation dot1Q 200
!
Dependant upon where the ip address is defined BDI100 or VLAN100 reachability is limited to devices connected to the etherswitch or the adjacent switch via Gi0/0/0.
When I look at spanningtree for vlan 100 we get this.
sh spanning-tree vlan 100
G0:VLAN0100
Spanning tree enabled protocol rstp
Root ID Priority 32868
Address bce7.12e3.df61
This bridge is the root
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 32868 (priority 32768 sys-id-ext 100)
Address bce7.12e3.df61
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 300 sec
Interface Role Sts Cost Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Gi0/1/2 Desg FWD 4 128.12 P2p Edge
G1:VLAN0100
Spanning tree enabled protocol rstp
Root ID Priority 32868
Address b4e9.b00f.3f80
Cost 19
Port 6 (GigabitEthernet0/0/0)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 32868 (priority 32768 sys-id-ext 100)
Address bce7.12e3.df62
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 300 sec
Interface Role Sts Cost Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Gi0/0/0 Root FWD 19 128.6 P2p
Implying two completely isolated domains.
Does anyone know if these can be linked and the config changes needed, before I go and buy an SM-X-16G4M2X with the SFPs in the module.
