Alcatel OS6400-24 Betriebsanweisung PDF herunterladen (Seite 51)

August 2008

OmniSwitch 6400 ------ Release 6.3.3.R01 Page 51 of 55

Spanning Tree

PR Description Workaround

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 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

For items 1 and 2 above there is no

work around presently. For item 3 the

following work around 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.

108339 Dynamic aggregates may be configured with the

participant links spanning multiple elements of a

stack. In this case, if the line card where the

primary link of the aggregate resides goes down,

there may be a small time interval (roughly 10-15

seconds) during which outgoing BPDUs may be

discarded. As result, the hello interval on

neighboring switches may expire leading to STP

reconvergence.

Use static linkagg to obtain optimal

performance.

121509 If a port with PVST+ enabled is connected to

third-party switching device and the STP state is

repetitively toggled, the port link may go down.

The link comes UP again if the

corresponding port on the remote side

is made administratively DOWN and

then back UP.

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