Physical topology. ASR1001X-->LACP-->4500X VSS
Logical topology. ASR port channel 15.1250, /30 routed link to VSS port channel 15 trunk with vlan 1250.
OSPF adjacency between po15.1250 and vlan 1250 works fine when load balancing algorithm on ASR is set to default (flow based).
When load balancing algorithm is set to VLAN based, OSPF gets stuck in EXSTART. (MTU is identical on both sides).
The two devices can no longer ping eachother on VLAN 1250 when LB is set to VLAN based on ASR.
4500x EC LB global setting set to default src-dst-ip
The reason I want to change the load balancing on the ASR is because it will not accept a service-policy on a port-channel sub-interface unless the LB method is set to 'load-balance vlan'.
Relevant config below, you'll notice I'm also doing OTV bridge groups on Po15 but that works fine with either LB method, its the layer 3 forwarding on the sub int that breaks.
interface Vlan1250
ip address 10.217.0.65 255.255.255.252
interface Port-channel15
switchport
switchport trunk native vlan 1000
switchport trunk allowed vlan 18,212,1000,1250
switchport mode trunk
switchport nonegotiate
router ospf x
no passive-interface Vlan1250
network 10.217.0.65 0.0.0.0 area 0
/////////////////////////////////////////////////////////////////////////
interface Port-channel15
no ip address
no negotiation auto
service instance 18 ethernet
encapsulation dot1q 18
bridge-domain 18
!
service instance 212 ethernet
encapsulation dot1q 212
bridge-domain 212
!
service instance 1000 ethernet
encapsulation untagged
bridge-domain 1000
!
end
interface Port-channel15.1250
encapsulation dot1Q 1250
ip address 10.217.0.66 255.255.255.252
router ospf x
no passive-interface Port-channel15.1250
network 10.217.0.66 0.0.0.0 area 0
