Configure neighbor cache thresholds

For environments that manage a large number of network endpoints or container networking interfaces, configure the IPv4 and IPv6 neighbor cache thresholds on the NetBackup Snapshot Manager host to ensure sufficient neighbor table capacity.

Create or update a sysctl configuration file, such as: /etc/sysctl.d/99-neighbor-cache.conf

Add the following entries to the created file:

net.ipv4.neigh.default.gc_thresh1 = 128
net.ipv4.neigh.default.gc_thresh2 = 512
net.ipv4.neigh.default.gc_thresh3 = 1024

net.ipv6.neigh.default.gc_thresh1 = 128
net.ipv6.neigh.default.gc_thresh2 = 512
net.ipv6.neigh.default.gc_thresh3 = 1024

Apply the changes using the sysctl --system command without restarting the host.