Open Problem Reports and Feature Exceptions

Workaround: For items 1 and 2 above, there is no known workaround at this time. For item 3, the following workarounds could be applied:

1.Tune the max age (and or max hops in the case of MSTP) parameter to a lower value that is optimal for the network. This will reduce the convergence time and thereby the duration of temporary loops.

2.To select a new root bridge, consider assigning better priority for that bridge instead of assigning worse priority for the existing root bridge.

PR 96358

On an OS9000, during a Spanning Tree reconvergence triggered by link up/down or board power up/ down, the DVMRP subsystem may print the following error message: "dvmrpRecvProbe, Looping back our probes".

This happens only if the Spanning Tree protocol selected is RSTP and is caused by rapid transitions of port states. It has been verified that the problem does not happen for switched VLAN traffic. So there is no chance of a real loop in the network. Packets handled in software might experience the problem due to larger transit delays, but does not cause any malfunction.

Workaround: There is no known workaround at this time.

PR 100356

During boot-up, a Link aggregate port can momentarily become forwarding before blocking, causing BPDU and dynamic MACs to be learned on that port. The dynamic MACs could potentially remain learned on the Link aggregate port for some time, resulting in traffic disruption.

Workaround: Manually flush the MACs learned on the blocked port or admin down/up the blocked port.

PR 101214

Toggling the edge port of an OS9000 the very first time after boot-up may cause a TCN to occur in the STP (1d) network.

Workaround: Configure the port as an edge port instead of an autoEdge port or configure the switch to run in RSTP (1w) protocol.

PR 105493

Enabling Spanning Tree on an OS9000 in flat mode after disabling does not work when VLAN 1 is disabled.

Workaround: Enable VLAN 1, enable STP and disable VLAN 1.

Step1: disable Spanning Tree -> vlan 1 stp disable

OmniSwitch 6800/6850/9000—Release 6.1.3.R01

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Alcatel-Lucent 9000, 6800, 6850 user manual Open Problem Reports and Feature Exceptions