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Switch Meshing
Operating Notes for Switch Meshing
traffic patterns, including the situation where multiple VLANs are configured
and a broadcast path through the mesh domain leads only to ports that are in
the same VLAN as the device originating the broadcast.
Unicast Packets with Unknown Destinations
A meshed switch receiving a unicast packet with an unknown destination does
not flood the packet onto the mesh. Instead, the switch sends a query on the
mesh to learn the location of the unicast destination. The meshed switches
then send 802.2 test packets through their non-meshed ports. After the unicast
destination is found and learned by the mesh, subsequent packets having the
same destination address will be forwarded. By increasing the MAC Age Time
in the System Information screen (page
6-10) you can cause the switch address
table to retain device addresses longer. Because the switches in a mesh
exchange address information, this will help to decrease the number of unicast
packets with unknown destinations, which improves latency within the switch
mesh. Also, in an IP environment, HP recommends that you configure IP
addresses on meshed switches. This makes the discovery mechanism more
robust, which contributes to decreased latency.
Spanning Tree Operation with Switch Meshing
Using STP or RSTP with several switches and no switch meshing configured
can result in unnecessarily blocking links and reducing available bandwidth.
For example:
14-19