Cisco Cisco ONS 15454 SONET Multiservice Provisioning Platform (MSPP) Guía De Diseño
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Spanning Tree Parameters
Table 7-25 shows the 802.1D STP parameters for the Ethernet cards.
Table 7-25 shows the 802.1D STP parameters for the Ethernet cards.
Table 7-25: 802.1D Spanning Tree Parameters
Parameter Description Default
Range
BridgeID
ONS 15454 unique
identifier that transmits the
configuration bridge
protocol data unit (BPDU);
the bridge ID is a
combination of the bridge
priority and the ONS 15454
MAC address
identifier that transmits the
configuration bridge
protocol data unit (BPDU);
the bridge ID is a
combination of the bridge
priority and the ONS 15454
MAC address
Read Only
Read Only
Priority
Defines bridge priority
32768
0 - 65535
TopoAge
Amount of time in seconds
since the last topology
change
since the last topology
change
Read Only
Read Only
TopoChanges
Number of times the
spanning tree topology has
been changed since the
node booted up
spanning tree topology has
been changed since the
node booted up
Read Only
Read Only
DesignatedRoot
Identifies the spanning
tree’s designated root for a
particular spanning tree
instance
tree’s designated root for a
particular spanning tree
instance
Read Only
Read Only
RootCost
Identifies the total path cost
to the designated root
to the designated root
Read Only
Read Only
RootPort
Port used to reach the root
Read Only
Read Only
MaxAge
Maximum time that
received-protocol
information is retained
before it is discarded
received-protocol
information is retained
before it is discarded
20
6 - 40 seconds
HelloTime
Time interval, in seconds,
between the transmission of
configuration BPDUs by a
bridge that is the spanning
tree root or is attempting to
become the spanning tree
root
between the transmission of
configuration BPDUs by a
bridge that is the spanning
tree root or is attempting to
become the spanning tree
root
2
1 - 10 seconds
HoldTime
Minimum time period, in
seconds, that elapses
during the transmission of
configuration information on
a given port
seconds, that elapses
during the transmission of
configuration information on
a given port
ForwardDelay
Time spent by a port in the
listening state and the
learning state
listening state and the
learning state
15
4 - 30 seconds
The ML-Series cards also support the 802.1T spanning tree extensions shown in Table 7-26.
Table 7-26: 802.1T Spanning Tree Extensions
Switch Priority Value
Extended System ID (Set Equal to the Bridge ID)
Bit 16
Bit 16
Bit
16
16
Bit
16
16
Bit
16
16
Bit
16
16
Bit
16
16
Bit
16
16
Bit
16
16
Bit
16
16
Bit
16
16
Bit
16
16
Bit
16
16
Bit
16
16
Bit
16
16
Bit
16
16
32768 16384 8192 4096 2048 1024 512 256 128 64 43 16 8
4
2
1
Rapid Spanning Tree
The ML-Series cards support per-VLAN rapid spanning tree and a maximum of 255 rapid
spanning tree (RSTP) instances per port.