11-25-2011 05:38 PM - edited 03-01-2019 05:31 PM
Hi,
Is there a way to make a router sends RA only under certains conditions ?
For example i would like a router to sends RA only if a specific SLA is true of if the uplink interface (WAN) is UP/UP, etc.
Any ideas ?
Regards,
Martin
11-26-2011 11:08 AM
hi,
maybe with a TCL script or EEM you can disable RA advertisement and reenable it if the sla object is UP but I've never tried it and I don't see any other way of doing this , not even knowing if this is possible like this.
Regards.
Alain
11-27-2011 04:52 PM
I think that any design requiring this behaviour is flawed. Can you ellaborate as to the need for this ? What problem are you trying to solve ?
11-28-2011 01:55 PM
Thank you everyone,
I agree with you stmillet, this is not a good practice and a routing protocol or HSRP should be used instead. This is not a real case but i was wondering if there is RA feature that i missed out that could do the trick.
Ex: 2 internet access with RA enabled ISP routers. Some ISP doesn't allow HSRP/VRRP and running an IP routing protocol requires an L3 device in the customer network (i'm talking about an ultra low-cost design). Conditionnal RA could be helpul here isn't ?
Regards,
11-28-2011 10:18 PM
Hi Martin,
RFC4191 brings one piece of the solution but we still need the "tracking part" which I guess will not be standardized.
Thanks,
Laurent.
11-30-2011 03:28 PM
Hello,
I just read RFC 6204 about Basic Requirements for IPv6 Customer Edge Routers and it is explicity written:
G-4: By default, an IPv6 CE router that has no default router(s) on
its WAN interface MUST NOT advertise itself as an IPv6 default
router on its LAN interfaces. That is, the "Router Lifetime"
field is set to zero in all Router Advertisement messages it
originates [RFC4861].
G-5: By default, if the IPv6 CE router is an advertising router and
loses its IPv6 default router(s) on the WAN interface, it MUST
explicitly invalidate itself as an IPv6 default router on each
of its advertising interfaces by immediately transmitting one
or more Router Advertisement messages with the "Router
Lifetime" field set to zero [RFC4861].
It means putting "ipv6 nd ra-lifetime 0" when WAN is down...
Can someone explain me how it can be achieved ?
Regards,
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
New here? Get started with these tips. How to use Community New member guide