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OmniSwitch 6800/6850/9000—Release 6.1.3.R01 page 63
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