[Ns-bugs] [Bug 1168] New: Default ExpirationTime not realistic

[code@nsnam.ece.gatech.edu]

https://www.nsnam.org/bugzilla/show_bug.cgi?id=1168

           Summary: Default ExpirationTime not realistic
           Product: ns-3
           Version: ns-3-dev
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: minor
          Priority: P5
         Component: bridge
        AssignedTo: gjcarneiro at gmail.com
        ReportedBy: gjcarneiro at gmail.com
                CC: ns-bugs at isi.edu
   Estimated Hours: 0.0


When I wrote BridgeNetDevice for some reason I was convinced there was nothing
about default values in the standard, but I just discovered I was wrong:

    .AddAttribute ("ExpirationTime",
                   "Time it takes for learned MAC state entry to expire.",
                   TimeValue (Seconds (30)),
                   MakeTimeAccessor (&BridgeNetDevice::m_expirationTime),
                   MakeTimeChecker ())

The standard 802.1D-2004 says in page 44 sec. 7.9.2:

Parameter: Ageing Time
Recommended default value: 300.0 s
Range: 10.0–1 000 000.0 s

We should probably fix ns-3 to be more aligned with the standard.

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