RACOM Ray2, User Manual

Page: 104 / 235

7.5.4. Advanced
Trunk
Fig. 7.26: Menu Switch settings - Advanced - Trunk
Port trunking is supported by the device using any combinations of ports. The ports that are to be as-
sociated with the trunk need to have all the port member's defined with the same
Id (TrunkID) and the
Enabled parameter has to be enabled.
When a frame enters a Trunk Port its Source Address (SA) is learned with its association to the ingress
port's TrunkID number. In this way the contents of the address database contain the same association
with the frame's SA regardless of the link of the trunk the frame entered the switch.
When frames are routed back toward a trunk the frame will have its Destination Address (DA) found
from the address database. If the frame's DA is unknown the frame will try to flood out all ports of the
trunk (this is OK in so far as this will be fixed with load balancing). If the frame's DA is found, the entry
will indicate mapping to a trunk and the entry's DPV bits will contain the TrunkID associated with this
frame's DA. This TrunkID needs to be converted into a DPV (Destination Port Vector) that the rest of
the switch can use. This is accomplished by accessing the Trunk Mapping table using the TrunkID that
was in the ATU's entry.
Balancing mode
Hash DA and SA for TrunkMask selection. Trunk load balancing is accomplished
using the frame's DA and SA fields to access one of eight Trunk Masks. Two
options are available:
The lower 3 bits if the frame's DA and SA are XOR'ed together
to select the TrunkMask to use. XOR
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