08-17-2024 02:50 AM - edited 08-17-2024 05:23 AM
Multilayer Switch66 can build ipv4 routing table via ospf.
```
20.0.0.0/24 is subnetted, 1 subnets
C 20.20.20.0 is directly connected, Vlan10
O IA 192.168.30.0/24 [110/2] via 20.20.20.29, 00:38:20, Vlan10
[110/2] via 20.20.20.69, 00:38:20, Vlan10
```
Why can't it build 1111::/64 table via ospf ?
```
C 2222::/64 [0/0]
via ::, Vlan10
L 2222::7777/128 [0/0]
via ::, Vlan10
L FF00::/8 [0/0]
via ::, Null0
```
Switch66 running config
ip cef
ip routing
ipv6 unicast-routing
ipv6 cef
!
interface GigabitEthernet1/0/1
switchport access vlan 10
!
interface GigabitEthernet1/0/2
switchport access vlan 10
!
interface Vlan10
ip address 20.20.20.66 255.255.255.0
ipv6 address 2222::7777/64
ipv6 ospf 1 area 0.0.0.0
!
router ospf 1
router-id 66.66.66.66
log-adjacency-changes
network 20.20.20.0 0.0.0.255 area 0.0.0.0
!
ipv6 router ospf 1
router-id 66.66.66.66
log-adjacency-changes
area 0.0.0.0 range 2222::/64
Switch69 running config
ip cef
ip routing
ipv6 unicast-routing
ipv6 cef
!
interface GigabitEthernet1/0/1
switchport access vlan 30
!
interface GigabitEthernet1/0/2
switchport access vlan 10
!
interface Vlan10
ip address 20.20.20.69 255.255.255.0
ipv6 address 2222::8888/64
ipv6 ospf 1 area 0.0.0.0
!
interface Vlan30
ip address 192.168.30.69 255.255.255.0
ipv6 address 1111::8888/64
ipv6 ospf 1 area 192.168.30.0
standby version 2
!
router ospf 1
router-id 69.69.69.69
log-adjacency-changes
network 192.168.30.0 0.0.0.255 area 192.168.30.0
network 20.20.20.0 0.0.0.255 area 0.0.0.0
!
ipv6 router ospf 1
router-id 69.69.69.69
log-adjacency-changes
area 0.0.0.0 range 2222::/64
area 192.168.30.0 range 1111::/64
Switch29 has the similar running config with Switch69 but with different ip address and Switch73 acts as a layer 2 switch. The topo shows below.
08-17-2024 06:49 AM - edited 08-17-2024 06:50 AM
Hello @nmmn1359 ,
check on switch66 if the OSPFv3 adjacency with switch69 is built using
show ipv6 ospf neighbors
This is the first step on troubleshooting.
Hope to help
Giuseppe
08-17-2024 07:05 AM
This command shows nothing. What configurations do I miss ?
08-17-2024 08:20 AM - edited 08-17-2024 08:28 AM
Hello @nmmn1359 ,
switch66 : vlan 10: ipv6 address: ipv6 address 2222::7777/64
and
switch69: vlan 10 : ipv6 address 2222::8888/64
are in the same /64 IPv6 subnet or are they are in two different IPv6 subnets ?
for me they are in two different IPv6 subnets.
read the following document
look at the configuration of ipv6 address both routers have the following:
ipv6 address FD01:ABAB::/64 eui-64
add eui-64 on your configuration of ipv6 addresses.
OSPFv3 can build adjacency on link local addresses FE80 ...
Hope to help
Giuseppe
08-17-2024 08:16 AM
Hi @nmmn1359 ,
I think this is due to a Cisco Packet Tracer limitation. Try applying the IPv6 configuration directly on the physical instead of the vlan interface and the ipv6 ospf adjacency should come up.
Switch69:
no interface Vlan10
interface GigabitEthernet1/0/2
no switchport
ip address 20.20.20.69 255.255.255.0
ipv6 address 2222::8888/64
ipv6 ospf 1 area 0.0.0.0
Do the same on Switch66 and the session should come up.
Regards,
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