We are about to get up MS Windows Network Load Balancing (WNLB) for a proxy array. The two array cluster members will be in different buildings connect to two different Cat6k switches, separated by a fibre link.
WNLB will be set up in "Multicast" mode, so a multicast MAC address exists to which clients address packets (all cluster members receive all packets, and WNLB decides which packets to discard, according to its load-balancing algorithm).
Therefore, any inbound packets will be flooded to all switch ports in the VLAN, and I cannot see a method of limiting this multicast traffic other than by placing these servers in a separate VLAN. Would it be possible to hard-wire static CAM entries into the switches to limit the multicast traffic (would static entries then be required on upstream switches)?
This may be less of an issue than I anticipate, as only inbound traffic will be flooded (reply traffic from the cluster members won't have multicast MAC addresses) and the cluster is for a proxy server array where less traffic is likely to be sent than received.
Incidentally, I see that Microsoft have improved WNLB in 2003 Server, and now IGMP can be used to limit the flooding of cluster-related multicast traffic on switch ports through IGMP snooping.
We are pleased to announce availability of Beta software for 16.6.3.
16.6.3 will be the second rebuild on the 16.6 release train targeted
towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are
looking for early feedback from customers befor...
Introduction Featured Speakers Luis Espejel is the Telecommunications
Manager of IENova, an Oil & Gas company. Currently he works with Cisco
IOS® and Cisco IOS XE platforms, and NX to some extent. He has also
worked as a Senior Engineer with the Routing P...
In this session you can learn more about Layer 3 multicast and the best
practices to identify possible threats and take security measures. It
provides an overview of basic multicast, the best security practices for
use of this technology, and recommendati...