Hello everybody,
I am Implementing Cisco IP Routing (CCNP ROUTE FLG) book and right now I am reviewing IPv6 chapter.
This part of OSPFv3 multiple instances over a single physical interface caught my attention

According to the Figure 8-27, each router is connected via a single interface to a shared segment.
R3 is running only one instance, Instance 1
R4 is running only one instance, Instance 2
R1 and R2 are running both instances

I wanted to see this running (since no example configuration for this feature was provided), so I fired up my GNS3, connected 4 routers (C2691-ADVIPSERVICESK9-M, Version 12.4(15)T12) via a single Ethernet switch and eventually ended without getting it to work

I configured IPv6 addresses in Fa0/0 interfaces and verified connectivity (directly connected neighbors' Fa0/0s could be pinged)
I enabled
I created process and assigned a unique router ID to every router
under R3 Fa0/0 interface I configured
under R4 Fa0/0 interface I configured
under R2 Fa0/0 interface I configured
under R1 Fa0/0 interface I configured


everything was running fine for instance 2 but no neighbors came up for instance 1
I checked the running-configuration and only the latter command for instance 2 was there

I tried it with separate OSPF proecesses on R1 and R2 e.g.

but it only took the latter command (the first one was overwritten with the second one)

Apparently it only takes 1 command per interface

Could anybody please tell me what am I doing wrong?
How can I run multiple instances of OSPFv3 over a single physical interface as shown in the book ?

Thank you very much for any answers in advance

It looks like to me you should still use the same process id just different instance ids.

Sent from my ADR6400L using Tapatalk 2

I tried that

ok, neighborship with instance 1 neighbors came up
I entered another command for instance 2

neighborships for instance 1 went down, came up for instance 2

I did show run int f0/0
and only the latter command was there, e.g. the 1st one was overwritten

Need to be different areas

Sent from my ADR6400L using Tapatalk 2

I tried that one as well



again the latter command has overwritten the previous one

According to the below (from here) you need to use one instance per address-family. So one instance for IPv4 and one for IPv6.

thank you very much
I need to hunt for a new enough IOS to test it in GNS3 since none of our 2811 have enough RAM to run anything more than 12.4T