User guide

HP Virtual Connect for Cisco Network Administrators (version 4.x)
Document Number: C01386629 Date: January 2014
page 43
Figure 22: Using multiple vNets to extend PVLAN configuration from external Cisco switch
(Please refer to Cisco documentation for a discussion of isolated, promiscuous, and community VLANs)
Multicast & IGMP Snooping
The IGMP Snooping feature allows VC-Enet modules to monitor (snoop) the IGMP
membership activities of the blade servers and optimize a vNet’s handling of multicast traffic to
maximize network resource utilization. Currently only IGMP v1 and v2 (RFC2236) are supported.
The IGMP Snooping idle timeout interval is set to 260 seconds by default. This value is basically
the "Group Membership Interval" value as specified by IGMP v2 specification (RFC2236). For
optimum network resource utilization, set the interval to match the configuration on the network's
multicast router.
By default, VC will flood, not prune, for all multicast groups. If a particular multicast group
receives an explicit join from a server NIC port, then that multicast group (and that group only) will
be pruned for any server NIC port that doesn’t transmit a join message. All other multicast groups
will continue to flood.
See the Virtual Connect User Guide for instructions on configuring IGMP
Snooping.
SPAN (Port Monitoring)
Virtual Connect supports port monitoring functionality to assist in troubleshooting networking
issues for servers connected to the external network through Virtual Connect. VC allows an
Administrator to define a single, active port monitoring session per VC domain.