Uploaded image for project: 'LLDP - Link Layer Discovery Protocol'
  1. LLDP - Link Layer Discovery Protocol
  2. PSLLDP-167

Supported ranges of msgTxInterval and msgTxHold do not comply with IEEE Std 802.1AB™-2016

    Details

    • Type: Change
    • Status: Closed
    • Priority: Minor
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: V4.4.0.15, V4.4.2.0 (open)
    • Component/s: None
    • Labels:
      None
    • Account:
      SPC TCP_IP (SPCTCPIP)

      Description

      • Currently, the supported range of msgTxInterval is 5 - 32768 sec.
        This does not comply with the LLDP specification which states 1 - 3600 sec. See IEEE Std 802.1AB™-2016, section "9.2.5.7 msgTxInterval".
        The LLDP stack shall at least support a minimum TX interval of 1 second.
        The maximum interval shall be kept at 32768 seconds so that existing devices are not forced to change their behavior.
      • Currently, the supported range of msgTxHold is 2 - 10.
        This does not comply with the LLDP specification which states 1 - 100. See IEEE Std 802.1AB™-2016, section "9.2.5.6 msgTxHold".

      • In addition it was found that a change of msgTxInterval and/or msgTxHold does not have an immediate affect when observing the behavior on the network.
        Example:
        When changing msgTxInterval from 3600 seconds to 1 second, it is expected that right after setting the new value, the LLDP stack will start sending LLDP frame with a 1 second interval.
        Currently, the LLDP stack applies the new value not before the TX_TIMER expires. This means that in the worst case it takes up to 3600 seconds until the new interval of 1 second gets applied.
        This shall be changed so that the new value is applied right away by taking LLDP's "localChange" variable into account (see IEEE Std 802.1AB™-2016, section "9.2.5.3 localChange").

        Attachments

          Issue Links

            Expenses

              Activity

                Status Description

                  People

                  • Reporter:
                    KMichel Kai Michel
                  • Votes:
                    0 Vote for this issue
                    Watchers:
                    0 Start watching this issue

                    Dates

                    • Created:
                      Updated:
                      Resolved: