4-4
Switch Meshing
Switch Meshing Fundamentals
Operating Rules
(See also “Mesh Design Optimization” on page 4-23.)
■ A meshed switch can have some ports in the meshed domain and other
ports outside the meshed domain. That is, ports within the meshed domain
must be configured for meshing, while ports outside the meshed domain
must not be configured for meshing.
■ Meshed links must be point-to-point switch links.
■ On any switch, all meshed ports belong to the same mesh domain.
■ A switch can have up to 24 meshed ports.
■ A mesh domain can include up to 12 switches.
■ Up to five inter-switch, meshed hops are allowed in the path connecting
two nodes through a switch mesh domain. A path of six or more meshed
hops between two nodes is unusable. However, in most mesh topologies,
there would normally be a shorter path available, and paths of five hops
or fewer through the same mesh will continue to operate.
■ Hub links between meshed switch links are not allowed.
■ If the switch has multiple static VLANs and you configure a port for
meshing, the port becomes a tagged member of all such VLANs . If you
remove a port from meshing, it becomes an untagged member of only the
default VLAN.
■ A port configured as a member of a static trunk (LACP or Trunk) cannot
also be configured for meshing.
■ If a port belongs to a dynamic LACP trunk and you impose meshing on
the port, it automatically ceases to be a member of the dynamic trunk.
■ Meshing is not supported on ports configured with 802.1X access control.
■ On a port configured for meshing, if you subsequently remove meshing
from the port’s configuration and reboot the switch, the port returns to its
default configuration. (It does not revert to any non-default configuration
it had before being configured for meshing).
■ In a given mesh domain, switches in the same product family must run
the same switch software version. For example, if you update the software
version on one 8212zl switch, then you must update the software version
on any other 8212zl switch in the mesh. HP Networking recommends that
you always use the most recent software version available for the switches
in your network.
■ The spanning-tree configuration must be the same for all switches in the
mesh (enabled or disabled). If spanning tree is enabled in the mesh, it must
be the same version on all switches in the mesh: 802.1D, 802.1w, or 802.1s.
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