LLS allows for the extension of existing OSPF packets to provide additional bit space. The additional bit space enables greater information per packet exchange between OSPF neighbors.
When enabling LLS on the router, OSPF adjacency with the ASA stuck in INIT state.
Router(config-if)#ip OSPF lls (command to enable LLS)
On the Peer device, we get below Error (neighbor detached)
%OSPF-5-ADJCHG: Process 100, Nbr x.x.x.x on GigabitEthernet0/0/1 from FULL to DOWN, Neighbor Down: Interface down or detached.
Router(config)#logg OSPF-100 ADJ Gi0/0/1: Cannot see ourself in hello from x.x.x.x, state INIT
Router# sh ip ospf neighbor Neighbor ID Pri State Dead Time Address Interface x.x.x.x 1 INIT/DROTHER 00:00:16 y.y.y.y GigabitEthernet0/0/1 <----- Stuck in INIT
On ASA, the following log is generated:
ASA5525(config)# %ASA-4-409003: Received invalid packet: Bad LLS TLV length from Y.Y.Y.Y Soultion: A temporary solution is to disable the LLS on the router or switch connected to ASA. Interface gigabitEthernet 0/0/1 Ip ospf lls disable (Disable LLS)