Is OSPFv3 and OSPFv2 compatible?

Is OSPFv3 and OSPFv2 compatible?

Another similarity to the relationship of RIPng to RIPv2 is that OSPFv3 is not backward-compatible with OSPFv2. So if you want to use OSPF to route both IPv4 and IPv6, you must run both OSPFv2 and OSPFv3.

What are two important differences between OSPFv2 and OSPFv3?

OSPFv2 stands for Open Shortest Path First version 2 and OSPFv3 stands for Open Shortest Path First version 3. OSPFv2 is the IPv4’s OSPF version, whereas OSPFv3 is the IPv6’s OSPF version. In OSPFv2, many OSPF instances per interface are not supported, whereas in OSPFv3, many OSPF instances per interface are supported.

What is OSPFv3 used for?

External LSAs are used to advertise IPv4 routes redistributed from any IPv4 routing protocol, including connected and static. The IPv4 OSPFv3 process runs the Shortest Path First (SPF) calculations and finds the shortest path to those IPv4 destinations.

Which IPv6 multicast addresses are used by OSPFv3?

The multicast addresses used by OSPFv3 are as follows:

• FF02::5—This address represents all SPF routers on the link-local scope; it is equivalent to 224.0. 0.5 in OSPFv2.
• FF02::6—This address represents all designated routers (DRs) on the link-local scope; it is equivalent to 224.0. 0.6 in OSPFv2.

Is OSPFv3 only for IPv6?

Organizations can stick with OSPFv2 for IPv4, and then use OSPFv3 for IPv6-only for a configuration that separates the control planes and the forwarding planes. Organizations can now combine the configuration of IPv4 and IPv6 into a single OSPFv3 process that can work equally well for both IP protocols.

What is instance ID in OSPFv3?

OSPFv3 can support more than one instance per process. You could use an instance number of 0 (zero) through 255 to distinguish between the different OSPFv3 instances. In RFC 5838, the instance ID was re-purposed to be used to support address families with OSPFv3. The default instance is 0 if no other is defined.

How do I enable OSPFv2?

Enabling OSPFv2

1. Enter the router ospf command in global configuration mode to enable OSPF on the device.
2. Assign the areas to which the device will be attached.
3. Assign individual interfaces to the OSPF areas.
4. Assign a virtual link to any ABR that does not have a direct link to the OSPF backbone area.

Which multicast address does OSPFv3 use?

What two multicast addresses does OSPFv3 use? Explanation: Adjacencies and next-hop attributes now use link-local addresses, and OSPFv3 still uses multicast traffic to send its updates and acknowledgments with the addresses FF02::5 for OSPF routers and FF02::6 for OSPF designated routers.

What are two features of OSPFv3?

The following are some of the additions and changes to OSPFv3:

• Support for multiple instances per link. —With OSPFv3, you can run multiple instances of the OSPF protocol over a single link.
• Protocol Processing Per-link.
• Changes to Addressing.
• Authentication Changes.
• Support for multiple instances per-link.
• New LSA Types.

How do I enable OSPFv3?

Enabling OSPFv3

1. Enter the configure terminal command to access global configuration mode. device# configure terminal.
2. Enter the ip router-id command to specify the router ID.
3. Enter the ipv6 router ospf command to enter OSPFv3 router configuration mode and enable OSPFv3 on the device.

Can a IPv4 router become an OSPFv3 neighbor?

That’s looking good, the routers have become OSPFv3 neighbors: Another problem bites the dust! Lesson Learned: OSPFv3 for IPv6 has the same requirements to form a neighbor adjacency as OSPFv2 for IPv4. Apply your “IPv4 OSPF” knowledge to solve neighbor adjacency issues.

How is OSPFv2 related to the neighbor Table?

An OSPFv2 interface that receives these Hello packets determines if the settings are compatible with the receiving interface settings. Compatible interfaces are considered neighbors and are added to the neighbor table (see the Neighbors section).

What’s the difference between OSPFv2 and OSPF v3?

OSPFv3 still establishes neighbor adjacencies, has areas, different network types, the same metrics, runs SPF, etc. There are however some differences. OSPFv2 runs on top of IPv4 and since OSPFv3 runs on IPv6, some changes had to be made.

What are the requirements for the OSPFv2 interface?

The two OSPFv2 interfaces must match the following criteria: Hello interval Dead interval Area ID (see the Areas section) Authentication Optional capabilities If there is a match, the following information is entered into the neighbor table: