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Switch Meshing
Operating Notes for Switch Meshing
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Figure 14-21. Example of the Maximum Meshed Switch Hop Count
Connecting Mesh Domains: To connect two separate switch meshing
domains, you must use non-meshed ports. (The non-meshed link can be
a port trunk or a single link.) Refer to figure
14-3 on page 14-7.
Fast EtherChannel® (FEC): This cannot be configured on a meshed
port. (You can configure FEC on non-meshed ports in a switch that also
has meshed ports.)
Multiple Links Between Meshed Switches: Multiple mesh ports can
be connected between the same two switches, to provide higher band-
width. Each port that you want in the mesh domain should be configured
as Mesh (and not as a trunk—Trk). Note that if you configure a port as
Mesh, there is no “Type” selection for that port.
Automatic Broadcast Control: Series 5300XL switches do not offer this
feature. Thus, in a switch mesh comprised of Series 5300XL switches and
any of the 1600M/2400M/2424M/4000M/8000M switches, ABC must be
disabled (the default setting) on the 1600M/2400M/2424M/4000M/8000M
switches.
Network Monitor Port: If a network monitor port is configured, broad-
cast packets may be duplicated on this port if more than one port is being
monitored and switch meshing is enabled.
Compatibility with Older Switches: Each entry in a Series 5300XL
switch MAC-address table consists of a MAC address and a VLAN ID
(VID). In older switches there is no VID; just a MAC address. The older
switches will therefore see indistinguishable, duplicate addresses where
the Series 5300XL switches will see multiple different addresses consist-
ing on the same MAC address and different VIDs. In a switch mesh that
includes any 1600M/2400M/2424M/4000M/8000M switches, duplicate
MAC addresses entering the mesh on different switches are not allowed.
(These older switches do not recognize multiple instances of a particular
MAC address on different VLANs.) If you try to add one of these switches
to a mesh comprised entirely of Series 5300XL switches, and any of the
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