user manual
Table Of Contents
- Cisco ONS 15454 SDH Reference Manual
- Contents
- About this Guide
- Shelf and FMEC Hardware
- Common Control Cards
- Electrical Cards
- Optical Cards
- Ethernet Cards
- Storage Access Networking Cards
- Card Protection
- Cisco Transport Controller Operation
- Security and Timing
- Circuits and Tunnels
- SDH Topologies and Upgrades
- CTC Network Connectivity
- Alarm Monitoring and Management
- Ethernet Operation
- Hardware Specifications
- A.1 Shelf Specifications
- A.2 SFP Specifications
- A.3 General Card Specifications
- A.4 Common Control Card Specifications
- A.5 Electrical Card and FMEC Specifications
- A.5.1 E1-N-14 Card Specifications
- A.5.2 E1-42 Card Specifications
- A.5.3 E3-12 Card Specifications
- A.5.4 DS3i-N-12 Card Specifications
- A.5.5 STM1E-12 Card Specifications
- A.5.6 BLANK Card
- A.5.7 FMEC-E1 Specifications
- A.5.8 FMEC-DS1/E1 Card Specifications
- A.5.9 FMEC E1-120NP Card Specifications
- A.5.10 FMEC E1-120PROA Card Specifications
- A.5.11 FMEC E1-120PROB Card Specifications
- A.5.12 E1-75/120 Impedance Conversion Panel Specifications
- A.5.13 FMEC-E3/DS3 Card Specifications
- A.5.14 FMEC STM1E 1:1 Card Specifications
- A.5.15 FMEC-BLANK Card Specifications
- A.5.16 MIC-A/P Card Specifications
- A.5.17 MIC-C/T/P Card Specifications
- A.6 Optical Card Specifications
- A.6.1 OC3 IR 4/STM1 SH 1310 Card Specifications
- A.6.2 OC3 IR/STM1 SH 1310-8 Card Specifications
- A.6.3 OC12 IR/STM4 SH 1310 Card Specifications
- A.6.4 OC12 LR/STM4 LH 1310 Card Specifications
- A.6.5 OC12 LR/STM4 LH 1550 Card Specifications
- A.6.6 OC12 IR/STM4 SH 1310-4 Card Specifications
- A.6.7 OC48 IR/STM16 SH AS 1310 Card Specifications
- A.6.8 OC48 LR/STM16 LH AS 1550 Card Specifications
- A.6.9 OC48 ELR/STM16 EH 100 GHz Card Specifications
- A.6.10 OC192 SR/STM64 IO 1310 Card Specifications
- A.6.11 OC192 IR/STM64 SH 1550 Card Specifications
- A.6.12 OC192 LR/STM64 LH 1550 Card Specifications
- A.6.13 OC192 LR/STM64 LH ITU 15xx.xx Card Specifications
- A.7 Ethernet Card Specifications
- A.8 Storage Access Networking Card Specifications
- Administrative and Service States
- Network Element Defaults
- Index

REVIEW DRAFT—CISCO CONFIDENTIAL
14-18
Cisco ONS 15454 SDH Reference Manual, R5.0
April 2008
Chapter 14 Ethernet Operation
14.3.6 E-Series Spanning Tree (IEEE 802.1D)
14.3.6.2 Spanning Tree on a Circuit-by-Circuit Basis
You can also disable or enable STP on a circuit-by-circuit basis on single-card EtherSwitch E-Series
cards in a point-to-point configuration. This feature allows customers to mix spanning tree protected
circuits with unprotected circuits on the same card. It also allows two single-card EtherSwitch E-Series
cards on the same node to form an intranode circuit.
14.3.6.3 E-Series Spanning Tree Parameters
Default STP parameters are appropriate for most situations (Table 14-2). Contact the Cisco Technical
Assistance Center (Cisco TAC) before you change the default STP parameters.
14.3.6.4 E-Series Spanning Tree Configuration
To view the spanning tree configuration, at the node view click the Provisioning > Etherbridge >
Spanning Trees tabs. (Table 14-3).
Table 14-2 Spanning Tree Parameters
Parameter Description
BridgeID ONS 15454 SDH 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 SDH MAC address
TopoAge Amount of time in seconds since the last topology change
TopoChanges Number of times the STP topology has been changed since the node booted up
DesignatedRoot STP’s designated root for a particular STP instance
RootCost Total path cost to the designated root
RootPort Port used to reach the root
MaxAge Maximum time that received-protocol information is retained before it is
discarded
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
HoldTime Minimum time period, in 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
Table 14-3 Spanning Tree Configuration
Column Default Value Value Range
Priority 32768 0 to 65535
Bridge max age 20 seconds 6 to 40 seconds
Bridge Hello Time 2 seconds 1 to 10 seconds
Bridge Forward Delay 15 seconds 4 to 30 seconds