On 09.06.2018 15:26, Rodney W. Grimes wrote: >> Author: ae >> Date: Sat Jun 9 09:57:14 2018 >> New Revision: 334875 >> URL: https://svnweb.freebsd.org/changeset/base/334875 >> >> Log: >> Explicitly change the link state when we assingn an address. >> >> Since we are setting IFF_UP flag on SIOCSIFADDR, it is possible, that >> after this link state information still not initialized properly. >> This leads to problems with routing, since now interface has >> IFCAP_LINKSTATE capability and a route is considered as working only >> when interface's link state is in LINK_STATE_UP (see RT_LINK_IS_UP() >> macro). > > I was going to say something when the ability to up and down > the loopback interfaces was added as it perturbed me but I > could not put my finger on places it may cause problems so > remained silent on the matter. > > Now that I see this issue, having lo0 go DOWN can kill a network > that is using exported from lo0 into a routing protocol routes that > are used for management purposes.
This was one of the main reasons of this change. > How does Cisco, Juniper, etc at handle this? > Do any of them or all of them allow you to "down" loopback? AFAIK, they allow this. -- WBR, Andrey V. Elsukov
Description: OpenPGP digital signature