Juniper JUNOSE SOFTWARE FOR E SERIES 11.3.X - RELEASE NOTES 2010-11-09 Release Note page 33

Copyright © 2010, Juniper Networks, Inc.
If you enable detection of duplicate IPv6 prefixes using the aaa

duplicate-prefix-check command, and bring up a subscriber in a dual-stack network
(in which both IPv4 and IPv6 subscribers are present) over a static PPP interface for
which IPv6 prefix is configured for IPv6 Neighbor Discovery router advertisements
(using the ipv6 nd prefix-advertisement ipv6Prefix command), the subscriber
session is successfully brought up. When you attempt to bring up another subscriber
over a different interface on the same virtual router as the one used for the first
subscriber, and for which the Ipv6-NdRa-Prefix (VSA 26-129) returned from the
RADIUS server in the Access-Accept message is the same IPv6 prefix as the
statically configured value for the first subscriber, the second subscriber session is
also brought up and not disconnected as expected.
In such a scenario, the duplicate IPv6 prefix detection functionality does not cause
the second subscriber session, which uses the same IPv6 prefix as the first subscriber
session, to be rejected. Also, a new IPv6 route is installed for the second subscriber as
a duplicate access-internal route. [Defect ID 187264]
When you upgrade from certain releases to JunosE Release 9.2.0p1-0 or

higher-numbered releases, descriptions configured for IP interfaces or IP
subinterfaces are not retained across the upgrade when the descriptions are shorter
than 9 characters in length. Additionally, VRF descriptions are not retained across the
upgrade when the combined length of the VRF description and the VRF name is
shorter than 9 characters. This behavior is seen during upgrades using a reload,
stateful SRP switchover, or unified ISSU. Upgrades from the following releases are
affected by this behavior:
 7.x.x
 8.0.x
 8.1.x, 8.2.x, and 9.x.x builds created before July 23, 2008
Examples of descriptions that are not retained across the upgrade:
host1(config-if)#ip description 12345678
host1(config)#ip vrf 123
host1(config-vrf)#description 45678
Examples of descriptions that are retained across the upgrade:
host1(config-if)#ip description longdescription
host1(config)#ip vrf longername
host1(config-vrf)#description 45678
host1(config)#ip vrf 123
host1(config-vrf)#description longdescription
Work-around: Before you upgrade from an affected release to JunosE Release
9.2.0p1-0 or higher-numbered releases, ensure that you do the following:
 Change IP interface and subinterface descriptions to 9 or more characters.
 Change VRF descriptions, VRF names, or both so that the combination of
associated VRF names and descriptions consists of 9 or more characters.
Release 11.3.0
Known Behavior 25