LSA Options explained?

FrankGuthrie

When looking thorugh the OSPF database I see a line/field with the following description Options: (No TOS-capability, DC)



What does this means? What options can you change and what do they do?

EdTheLad

Read the OSPF rfc to learn about options. "No TOS-capability" means ospf will have one routing table rather than one rib for each TOS value, afaik Cisco only supports "No TOS-capability" . The DC means the router originating the LSA supports demand circuits, a demand circuit will suppress lsa hello's and route refresh, a virtual-link is an example of a demand circuit.

FrankGuthrie

Hi Ed, But don't you need hello's to create a neighbour relationship?


Does this mean that it does send hello's to set up the initial OPSF neighbour relationship, but not after the relationship has been established?

powmia

Does this mean that it does send hello's to set up the initial OPSF neighbour relationship, but not after the relationship has been established?

......yes

FrankGuthrie

....thanks