Comment 9 for bug 1562110

Reviewed: https://review.openstack.org/302816
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=8810a2535b65346e215e58d646d1144ebc80a850
Submitter: Jenkins
Branch: stable/liberty

commit 8810a2535b65346e215e58d646d1144ebc80a850
Author: Swaminathan Vasudevan <email address hidden>
Date: Fri Mar 25 12:38:13 2016 -0700

    DVR: Increase the link-local address pair range

    The current dvr_fip_ns.py file has FIP_LL_SUBNET configured
    with a subnet prefixlen of /23 which only allows 255 pairs of
    link-local addresses to be generated. If the number of routers
    per-node increases beyond the 255 limit it raises an assertion.

    This patch increases the link-local address cidr to be a /18
    to allow for 8K routers. The new range was chosen to not
    overlap with the original, allowing for in-place upgrades
    without affecting existing routers.

    Closes-Bug: #1562110
    Change-Id: I6e11622ea9cc74b1d2428757f16aa0de504ac31a
    (cherry picked from commit 7b1b8c2de57457c2ec1ed784165a3e10e24151cf)