Foundry NetIron M2404C and M2404F Metro Access Switches
Configuring MSTP (Rev. 03)
Overview
© 2008 Foundry Networks, Inc
Page 57 of 70
TimeSinceTopologyChange = 3039 (Sec)
TopChanges = 2
Border Bridge
= Disabled
==========================================================================
Port |Pri|Prt role|State|PCost |DCost |Designated bridge |DPrt
--------+---+--------+-----+---------+---------+------------------+-------
01/01/01 128 Root frwrd 200000 0 00000.00A00001090B 128.002
01/01/02 128 Altern block 200000 0 32768.0012F20A0168 128.002
01/01/10 128 Designat frwrd 200000 0 32768.0012F20B0BC4 128.010
If for example, the direct link between switch 1 and switch 3 fails (see
Figure 9
), MSTI01 is
recalculated and port 1/1/2 in switch 3 changes its role from alternate to root.
Figure 9: Link Failure between Two Switches
In this case, the
show mstp
command will show the following.
On Switch 2 and Switch 4:
The output displayed by the
show mstp
command will not be affected by the change.
On Switch 1:
device-name
#
show mstp
Multiple spanning trees = enabled
ProtocolSpecification = ieee8021s
Priority = 0
TimeSinceTopologyChange = 0 (Sec)
TopChanges = 6
CIST Root = 32768.00:A0:00:01:09:0B
MaxAge = 20 (Sec)
HelloTime = 2 (Sec)
ForwardDelay = 15 (Sec)
BridgeMaxAge = 20 (Sec)
BridgeHelloTime = 2 (Sec)
BridgeForwardDelay = 15 (Sec)
ProtoMigratioDelay = 3 (Sec)
MaxHopCount = 40
TxHoldCount = 3
SpanIgmpFastRecovery
= disabled
FastRing
= disabled
LearnMode = Standard
MST00
VLAN mapped = 1-99,101-199,201-4093
Priority = 32768
Regional Root = 32768.00:A0:00:01:09:0B