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Defining SNA Switching Node Link

From the SNA Service screen (Configure -> WAN/Data Services -> SNA), click on the Switching Node link at the top of the screen. You will see the SNA Switching Node screen listing the current configurations, like the following (example screens shown are from Passport 4460 units):

Parameter

Range of Values

Default Value

Required Action

Bridge Number

Integer (1..15)

1

Enter the bridge number for the Passport 4400 unit. This number must be unique for all bridges in the LAN.

Segment LF Size

Integer (516..1536)

521

Enter the largest frame size in octets that the switching component can forward on any path through itself. See RFC 2024.

Virtual Ring Number

Integer (1..4095)

4095

Enter the virtual ring number in which this switching component resides.

  • If a single source routed path (series path) exists between switching nodes (Passport unit to Passport unit), you should configure a unique virtual ring number for each node. In most networks, a series path exists between Passport units.
  • If a multiple source routed path (parallel path) exists between switching nodes, you should configure the same virtual ring number for these nodes. This will prevent looping of data.

See the illustration following this table.

Test Connect Timer

Integer (0..65535)

60

Enter the maximum time in seconds to establish an SNA connection via the configured LAN ports.

Circuit Timer

Integer (0..65535)

60

Enter the maximum time in seconds to reach a target.

Default Send Window

Integer (1..127)

7

Enter the default send window size.

Default Receive Window

Integer (1..127)

7

Enter the default receive window size.


End of procedure.


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