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page 62 OmniSwitch 6800/6850/9000—Release 6.1.3.R01
PR 107231
A stack of 3 OS6850's (slots 1 & 2 are 48 ports and slot 3 is 24 ports) with a mobile port of 1/35 (Second
Asic on Slot 1) and a binding mobile rule. A MAC violating is programmed as filtered. Now, this filtered
MAC is programmed on all slots. However, since there is only one ASIC on Slot 3, there is an error and
the address is not programmed as filtered on slot 3.
Workaround: There is no known workaround at this time.
Spanning Tree
Problem Reports
PR 89316
A BPDU packet with the Root BridgeID of 0xffff...is sent out with every link-up to elicit a BPDU reply
from the adjacent switch in the current Auto-Edge Detection mechanism.
Workaround: There is no known workaround at this time.
PR 90297
On an OS6800/OS9000, CST Root convergence in 802.1s may be slow due to the circulation of old ‘good’
spanning tree vectors in the network when a root switch is powered off.
Workaround: 1) Use single MSTP region as much as possible. 2) Tune the performance parameters
maxAge and hop count to optimal values for the network.
PR 95308
Temporary traffic loops could happen under the following scenarios:
1. Reloading of a non-root bridge.
This happens when the bridge is going down and is due to the sequential bringing down of NIs during a
reload process. It is purely temporary in nature and stops when all the NIs eventually get powered off.
2. NI power down
When an NI power down command is executed for an NI and if that NI has the Root port and other NIs
have Alternate ports, it is possible to see some traffic looping back from the newly elected Root port. The
traffic loop back is temporary and will stop once the NI gets powered off.
3. New Root bridge selection
Temporary loops could occur during the process of electing a new Root bridge, if this election process is
triggered by the assignment a worse priority for the existing root bridge or a root bridge failure. This
happens due to the inconsistent spanning tree topology during the convergence and stops entirely once the
network converges.