14.
Multiple Spanning Tree Protocol (MSTP)
MN700004 Rev 01
175
Forward Transitions
= 1
Port Role
= Root
Port Path Cost
= 200000
CIST Root
= 00000.000000000000
ExternalPortPathCost =
200000
Designated Root
= 32768.00A012110708
Port Path Cost
= 200000
Designated Bridge
= 32768.00A01211227A
Designated Port Id
= 128.2
AdminEdgePort
= disabled
OperEdgePort
= disabled
AdminLink-Type
= PointToPoint
Link-Type
= PointToPoint
MSTP Global Parameters Configuration
The following example shows how to configure MSTP global parameters.
1. Enter into Protocol Configuration mode and set the
forward-delay
value to
5
seconds:
device-name
#
configure terminal
device-name
(config)#
protocol
device-name
(cfg protocol)#
mstp forward-delay 5
2. Configure the following parameters:
Hello-time
to
4
seconds,
max-age
time
to
34
seconds and
max-hop count
to
23
.
device-name
(cfg protocol)#
mstp hello-time 4
device-name
(cfg protocol)#
mstp max-age 34
device-name
(cfg protocol)#
mstp max-hops 23
device-name
(cfg protocol)#
end
3. Display the MSTP configuration:
device-name
#
show mstp
Multiple spanning trees = enabled
ProtocolSpecification = ieee8021s
Priority = 32768
TimeSinceTopologyChange = 0 (Sec)
TopChanges = 8
CIST Root = 00001.00:A0:12:0F:2F:27
CIST Port = 01/01/10
CIST Cost = 200000
MaxAge = 20 (Sec)
HelloTime = 2 (Sec)
ForwardDelay = 5 (Sec)
BridgeMaxAge = 0 (Sec)
BridgeHelloTime = 4 (Sec)
BridgeForwardDelay = 5 (Sec)
ProtoMigratioDelay = 3 (Sec)
MaxHopCount = 23
TxHoldCount = 3
MST00
VLAN mapped = 2-4094
Regional Root = This bridge is the root
RemainingHopCount = 23
TopChanges
= 8
====================================================================
Port |Pri|Prt role|State|PCost |DCost |Designated bridge | Prt
--------+---+--------+-----+-----+-------+------------------+-------
01/01/01 128 Designat frwrd 200000 200000 32768.00A01211227A 128.001
01/01/10 128 Root frwrd 200000 0 00000.00A0120F2F27 128.006