IPv6 OSPFv3- Blocks all Link-Local address

[Cesar Duran]

Hello team,

if i decided to secure IPv6 environment with traffic filters and blocks all link-local addresses. What will happen to OSPFv3?

[balaji.bandi]

How will you configure OSPF config for IPv6? are you going to configure interface level with neighbour link-local address right?

what is the requirement here to block link-local address?

Note: I may be misunderstood the question here.

[Cesar Duran]

Hello Balaji.

the question is:

An engineer decided to secure IPv6 environment with traffic filters and blocks all link-local addresses. What will happen to OSPFv3?

from a CCNP Route 300-101

Best Regards

[balaji.bandi]

OSPF neighbor relationships  fails.

[Harold Ritter]

OSPFv3 needs link local connectivity in order to establish an adjacency. Without it, it will not come up.

Regards,

[Faraz Shamim]

If you block all link local then off course ospfv3 neighbors will go down. Since link local addresses are not routeable so I don’t really see any reasons to block it. No only ospfv3 but you will also block neighbor discovery packets which provides basic ipv6 functionality.