IPV6 EIGRP Route advertisement from switches

[djgraves1986@gmail.com]

I have two neighboring routers, each router neighbors a switch. I have ROAS on each interface connected to the switch. On each switche I have 2 vlans that each have ip addresses. Each switch can communicate with the router and vice versa. I have EIGRP routes from each neighboring routers, however the routers are not advertising EIGRP routes to the switch. So basically each router can ping its neighboring router's ip address that is outside of its network but it can't reach the switch which is in the same network as the router that was pinged. Help is appreciated, hopefully this question is clear.

Switch 1 config

interface FastEthernet0/1

switchport trunk encapsulation dot1q

switchport mode trunk

!

interface FastEthernet0/2

switchport access vlan 10

!

interface FastEthernet0/3

switchport access vlan 20

interface Vlan10

mac-address 0000.0cbd.d601

no ip address

ipv6 address 2001:0:0:10::2/64

!

interface Vlan20

mac-address 0000.0cbd.d602

no ip address

ipv6 address 2001:0:0:20::2/64

Router 1 Config 

interface GigabitEthernet0/1

no ip address

duplex auto

speed auto

ipv6 address 2001:0:0:1::1/64

ipv6 eigrp 1

interface GigabitEthernet0/2

no ip address

duplex auto

speed auto

ipv6 eigrp 1

interface GigabitEthernet0/2.10

encapsulation dot1Q 10

no ip address

ipv6 address 2001:0:0:10::1/64

ipv6 eigrp 1

interface GigabitEthernet0/2.20

encapsulation dot1Q 20

no ip address

ipv6 address 2001:0:0:20::1/64

ipv6 eigrp 1

ipv6 router eigrp 1

eigrp router-id 1.1.1.1

no shutdown

Router 2 config 

interface GigabitEthernet0/1

no ip address

duplex auto

speed auto

ipv6 address 2001:0:0:1::2/64

ipv6 eigrp 1

interface GigabitEthernet0/2.10

encapsulation dot1Q 30

no ip address

ipv6 address 2001:0:0:30::1/64

ipv6 eigrp 1

interface GigabitEthernet0/2.20

encapsulation dot1Q 40

no ip address

ipv6 address 2001:0:0:40::1/64

ipv6 eigrp 1

ipv6 router eigrp 1

eigrp router-id 2.2.2.2

no shutdown

Switch 2 config

interface FastEthernet0/1

switchport trunk encapsulation dot1q

switchport mode trunk

!

interface FastEthernet0/2

switchport access vlan 30

!

interface FastEthernet0/3

switchport access vlan 40

interface Vlan30

mac-address 0060.70c4.9401

no ip address

ipv6 address 2001:0:0:30::/64

ipv6 address 2001:0:0:30::2/64

!

interface Vlan40

mac-address 0060.70c4.9402

no ip address

ipv6 address 2001:0:0:40::2/64

[ADP_89]

Hello,

This is happening because the switches do not have a default gateway. They get ICMP echo from an external subnet but they do not know where to forward the replies in order to get out of the local subnet.

The info you provided is not complete, specially I do not understand if this is a real scenario or if you are just testing EIGRP on IPv6 using the switches like if they were hosts. But you might have 2 options:

- Extend EIGRP on the switches (if they support it)

- Add an IPv6 static route to the switch and point it to one of the router local IP: (e.g for switch1 would be ipv6 route ::/0 2001:0:0:10::1)

HTH,

ADP 

[djgraves1986@gmail.com]

It’s not a real life scenario but what I am trying to do is have the networks be able to communicate with each other using EIGRP and then use ACLs to permit and deny some of the networks from going through certain devices.

[ADP_89]

I see, well you should consider using an emulator like GNS3,Eve-NG or Cisco VIRL to test those features. It will give you the ability to emulate routers, switches and end-hosts that you should use as traffic initiators. The routers will just serve as default gateway and EIGRP. The switches will trunk the vlans from the routers and provide some access ports to the end-hosts (I normally use a docker ipterm image on GNS3). With all this setup you will be able to properly test what you are looking for..

HTH,

ADP

[djgraves1986@gmail.com]

Thank you! I will give that a try.