
DLSw Implementation Notes
114063 Rev. A 2-3
-- Converts the CANUREACH frame back to a TEST (POLL) frame.
-- Forwards the TEST (POLL) frame to all interfaces on this slot which have
DLSw enabled.
• If the destination device resides on an attached LAN, then this device
responds by broadcasting a TEST (RESPONSE) message. Upon receiving
this response, the remote router:
-- Caches the MAC address (for SNA) or name (for NetBIOS) in the
appropriate table on the router.
-- Converts the TEST (RESPONSE) packet into a DLSw ICANREACH
frame.
-- Forwards the ICANREACH to the originating data link switch (router).
• Upon receiving the ICANREACH, the originating router:
-- Caches the MAC address or NetBIOS name and identity of the remote
router in the appropriate table on the router.
-- Converts the ICANREACH back to a TEST (RESPONSE) frame.
-- Forwards the packet to the originating workstation.
At completion, all routers and endstations can forward SNA and NetBIOS packets
appropriately, creating a logical session between endpoints.
Each slot on a Bay Networks router running DLSw functions as an independent
data link switch. The network administrator controls the packets forwarded to
DLSw by specifying the appropriate SAPs in the DLSw SAP Table.
Combining DLSw and SRB
A router running DLSw can communicate with a router running in an SRB
configuration. Multiple SRB networks can be interconnected locally or across a
TCP/IP backbone using DLSw (
Figure 2-1).
DLSw/SRB allows up to 13 total hops. This means that seven hops are allowed on
each side of the DLSw network, with one hop reserved exclusively for DLSw. All
other rules for configuring SRB networks using Bay Networks routers apply. For
detailed information on SRB, refer to Configuring Bridging Services.
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