PANL traffic between networked Passport nodes is achieved through PANL switching. When a Passport 4400 receives a PANL frame destined for another unit, the Passport 4400 consults a PANL switching table to determine which path the frame should take. If the destination is unknown, the Passport 4400 will route the frame further up the network hierarchy to be processed by a higher-level Passport node.
PANL switching is activated by the configuration of at least one PANL-DCE connection. A Passport 4400 with no configured PANL-DCE connection (such as units D, E, F, and G as shown in the Passport Network with PANL Switching figure below) functions as a typical frame relay access device. Switching information will still be passed along the PANL-DTE port to a higher-level Passport node.
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Note: The terms PANL-DCE and PANL-DTE refer to the logical (switching) function of the port, not the port clocking mode associated with physical DCE or DTE. |
PANL and Passport 6400 Interworking
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