Filter ::/0 EIGRP out interface

[sebastien3]

Hi,

With EIGRP IPV6 I want to redistribute the static and connected routes but not the

default route ::/0

distribute-list prefix-list FILTER_EIGRP out GigabitEthernet1/0
redistribute static
redistribute connected

ipv6 prefix-list FILTER_EIGRP seq 10 deny ::/0
ipv6 prefix-list FILTER_EIGRP seq 20 permit ::/0 le 128

interface Loopback0
no ip address
ipv6 address 2001:db8:1:1:1:1:1:100/128
ipv6 enable

If I use the FILTER_EIGRP filter it works for the

default route ::/0

but not with an IPV6 of loopback0 which is in (LC) Local/Connected.

This filter rule work for a subnet IPV6 /64 Static (S).

How would you write the filtering

access list FILTER_EIGRP

?

Thanks

[Harold Ritter]

Hi @sebastien3 ,

The issue is with the

eigrp stub

configuration. Please change the following:

From:

eigrp stub redistributed

To:

eigrp stub redistributed connected

The

loopback ipv6

address will then be advertised.

Regards,

[sebastien3]

Hi @Harold Ritter ,

You are right, the connected was missing !

I need an explanation on this. In IPV4 also in stub I don't need to use "connected" so that the IPs of the loopbacks are propagated. Can you tell me if this is an EIGRP IPV6 specificity ?

Thanks

[Harold Ritter · Accepted solution]

Hi @sebastien3 ,

 It definitely appears to be an

eigrpv6

implementation difference.

As can be seen below, the

lo0 ipv6

address is flagged as "Connected" in the topology database, while the

lo0 ipv4

address is flagged as

Rconnected

(or redistribute connected). This is most likely why only

stub redistributed

is sufficient with IPv4 to advertise the

lo0

address, while

stub redistributed connected

is required with IPv6.

DUT#sh ip eigrp topo

EIGRP-IPv4 VR(EIGRP) Topology Table for AS(10)/ID(192.168.100.1)

Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,

       r - reply Status, s - sia Status

P 192.168.100.1/32, 1 successors, FD is 163840

        via Rconnected (163840/0)

…

DUT#sh ipv6 eigrp topo

EIGRP-IPv6 VR(EIGRP) Topology Table for AS(10)/ID(10.10.10.229)

Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,

       r - reply Status, s - sia Status

P 2001:DB8:1:1:1:1:1:100/128, 1 successors, FD is 163840

        via Connected, Loopback0

…

Regards,

[sebastien3]

THANKS @Harold Ritter  ! I also agree with you, this explains why I had no problem with IPV4.