User`s guide

Workgroup Configuration
5-2
- If the ATX determines that the port does not belong to any workgroup
configuredfor thereceivedpacket’stype, the packetwillagain be sentout
through all other ports on the bridge that are in a Spanning Tree
Forwarding state.
- If the ATX determines that the port is a member of a single workgroup
configured for the received packet’s type, the packet will only be
forwarded to the other ports that are members of that same workgroup.
- If the ATX determines that the port is a member of multiple workgroups,
theATXnarrowsdown the most appropriateworkgroup(orworkgroups)
forthebroadcastpacket,andsendsitthroughallforwardingportsthatare
members of the appropriate workgroup (or workgroups).
IftheworkgroupsareconfiguredforALLbroadcastpackets,thebroadcast
issentthroughthe combined ports in those workgroups.Notethatif an IP
or IPX broadcast is detected at the port, but no IP or IPX workgroup is
definedfortheport, then any ALLworkgroupconfiguredforthe port will
be used instead.
If the workgroups are configured for an IP network, the IP routing tables
of those workgroups are combined, and the standard IP “best match”
algorithm is performed:
1. Attempt to match the complete destination IP of the broadcast —
matching network and host ID — and then, if a routing table entry is
found, forward the broadcast to the indicated next hop router or directly
connected interface; if this fails,
2. Search the routing table for an entry that matches only the network ID,
andthen— if oneisfound (taking intoaccounta subnet mask) —forward
the broadcast to the indicated next hop router or directly connected
interface; finally,
3. If no entry is found matching the network ID, search the routing tables
for a “default”entry, and forwardthe broadcast tothe indicatednext-hop
router.
If no match is found for the broadcast packet’s destination address using
the above methods, the packet is considered undeliverable and is
forwarded out all Spanning Tree Forwarding ports.
NOTE
In a case where an ALL and an IP or IPX workgroup exist for the same port, the
forwarding parameters for IP or IPX packets will be determined based on the IP or IPX
workgroup. Any non-IP or non-IPX packets will use the parameters set in the ALL
workgroup.