74 | Chapter 4 - AppleTalk Routing & Bridging |
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AppleTalk Phase 2 Configuration
AppleTalk Phase 2 is an updated version of the AppleTalk protocol which allows for more than 256 nodes on an Ethernet segment, and reduces the over- head required by AppleTalk RTMP (Routing Table Maintenance Protocol). AppleTalk Phase 2 should be used for all new installations.
>Phase 2 Routing/Bridging/Off
This set of radio buttons controls how AppleTalk Phase 2 packets are handled for this interface.
•If set to Phase 2 Routing, then AppleTalk Phase 2 packets received on this interface are routed to the correct interface on the router.
•If set to Phase 2 Bridging, then any AppleTalk Phase 2 packets received on this interface are forwarded to the router’s internal bridge. This setting makes this Ethernet interface a member of the “AppleTalk Phase 2 Bridge Group” for this router.
ϖNote: The Phase 1 Bridging radio button will be grayed out unless bridging has been turned on globally for the device using the Main Bridging Configuration Dialog Box (under Global/Bridging) and locally on this inter- face using the Bridging: Ethernet Dialog Box (under Ethernet/Bridging).
•If it is set to Phase 2 Off, then any AppleTalk Phase 2 packets received on this interface are discarded.
Phase 2 Seed Status
One of the functions which routers perform in AppleTalk internetworking is setting the AppleTalk network number for each network segment. A router which sets the network number for a segment is said to have “seeded” the network.
•Seed means the router will listen for an AppleTalk Phase 2 network range being set by another router on the segment connected to this inter- face and use this range if it exists. If it doesn’t discover a range in use, the router will use the configured AppleTalk Phase 2 Net # range (discussed below) to set the Phase 2 network number(s) for the segment. It will also assign the configured Phase 2 Zone list to the segment.
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