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Multiple Static Paths
per Port
If you assign multiple paths to a port, the port must be running PPP.
To use both B channels together on a built-in ISDN connector, to reserve a
path for disaster recovery, or to use another path for dial-on-demand,
failover, or bandwidth-on-demand, you can assign both paths to one port
and use Multilink PPP using:
ADD !<port> -PORT PAths <path> [,<path>...]
You may want to use static ports instead of a dial pool if you are only
dialing one destination and do not need the versatility of a dial pool.
See “Configuring Bandwidth Management for PPP” on page 89 for more
information about bandwidth management features such as
dial-on-demand.
Virtual Ports To configure multiple ports over one path, you create virtual ports. A
virtual port can be assigned to a static path, or for PPP, it can be assigned
to the SysCallerID of a remote site. SysCallerID virtual ports use paths in a
dial pool and are not associated to any one path.
A virtual port functions the same way as a nonvirtual port does, that is, as
a logical interface that represents a connection to a network.
For example, if a SuperStack II bridge/router central node needs to
connect to two separate boundary routers over the same ISDN port at
different times, you can create a virtual port for each boundary router.
The virtual ports would have all the connection information for each
boundary router.
Table 12 provides information on topologies that require virtual ports and
the node on which the virtual ports should be created.
Table 12 Topologies that Require Virtual Ports
Topology Virtual Ports Required?
Node That Virtual Ports
Should Be Created On
Boundary Routing over Frame Relay or X.25 Yes. Central node
Traditional routed environment: partially meshed or
nonmeshed Frame Relay and X.25 topologies
Depends on bridging or routing
protocol. See “Virtual Ports over
Frame Relay and X.25” for more
information.
Any router
Multidestination dialing (modem pooling) over PPP Yes, for dynamic dial-up lines. Central node
Frame Relay topology with disaster recovery
configured
Yes. Nodes on both ends of serial
line running Frame Relay