
DLSw Configuration Overview
3-7
If a unique IP address is not available, you must perform one of the following
tasks:
• For configurations that do not have as many physical IP interfaces as DLSw
slots, add multiple IP addresses to a single physical interface. For example,
you might want to do this in large SDLC configurations, since IP cannot be
configured on SDLC interfaces. For more information on configuring multiple
IP addresses, see Configuring IP Services.
• For single switch operation, enter any valid IP address that is available but not
used in your network. This address should be on a unique IP subnet.
Figure 3-4 shows a sample network with three routers running DLSw. Although
many options exist for the Slot Table, this network uses the following values in the
Slot Tables:
• Router A, the central site router, has three slots running DLSw, as follows:
— For Slot 1, the circuitless IP address is used in the Slot Table to represent
this slot. This provides the highest availability for Token Ring devices.
— For Slot 3, the IP address of the directly attached Frame Relay interface
represents this slot in the Slot Table.
— For Slot 4, note that an IP address cannot be assigned to an SDLC
interface, and no IP address is assigned to the Frame Relay interface.
Instead, the IP address of a Token Ring interface on Slot 1 is used in the
Slot Table. It is acceptable to use any other IP address existing on this
router to represent this slot.
• Router B, a remote site connected to the central site using Frame Relay, is a
single slot router running single switch DLSw. The IP address of the Frame
Relay interface represents this slot in the Slot Table.
Note: You can use the circuitless IP interface address for one (and only one)
DLSw-capable slot. Using the circuitless IP interface allows TCP connections
for DLSw services on that slot to be less dependent on the availability of
specific physical circuits or data links. We recommend that you set the
Keepalive Time parameter to a nonzero value when using the circuitless IP
address. (For more information on the circuitless IP interface, refer to
Configuring IP Services.)
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