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)#int g0/0/1

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.

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

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)