Known Behavior
19
Release 11.0.2
When you upgrade from a release numbered lower than Release 7.1.0, all
DHCP host routes previously stored in NVS are deleted. After the upgrade,
DHCP clients must reacquire their IP addresses, which results in the new host
routes being correctly stored in NVS.
DHCP External Server
If you are using DHCP external server and a burst of client releases occurs
during a unified ISSU, some of the client releases might not be processed.
[Defect ID 180178]
When the DHCP relay agent application and the DHCP external server
application are configured in the same virtual router, using the
ip
dhcp-external server-sync
command on an unnumbered IP interface does not
function as expected. When you issue the
ip dhcp-external server-sync
command in this configuration to create subscriber state information based on
lease renewals when the external DHCP server and the router are
unsynchronized, the router does not forward the ACK request from the DHCP
server to the client because there is no route. [Defect ID 88562]
When a bound DHCP client on a dynamic subscriber interface extends its IP
address lease by restarting the DHCP discovery process on its primary IP
interface instead of by initiating the DHCP renewal process on its dynamic
subscriber interface, the default behavior of the DHCP external server
application to preserve the client’s dynamic subscriber interface was changed
in the following JunosE releases to delete and re-create the client’s dynamic
subscriber interface:
Release 7.2.4p0-4 and all higher-numbered 7.2.x releases and patch
releases
Release 7.3.4 and all higher-numbered 7.3.x releases and patch releases
Release 8.0.4 and all higher-numbered 8.0.x releases and patch releases
Release 8.1.2 and all higher-numbered 8.1.x releases and patch releases
Release 8.2.3 and all 8.2.3 patch releases
Release 9.0.0 and all 9.0.0 patch releases
Release 9.0.1 and all 9.0.1 patch releases
Release 9.1.0 and all 9.1.0 patch releases
If you are upgrading the JunosE Software on the router from any of these
releases, you must explicitly issue the
ip dhcp-external
recreate-subscriber-interface
command to configure the router to continue to
delete and re-create the DHCP client’s dynamic subscriber interface.
NOTE:
The DHCP external server application is unsupported in JunosE Release
8.2.1 and JunosE Release 8.2.2.
