Cisco Systems 15310-CL, 15310-MA manual Election of the Root Switch

Page 71

Chapter 6 Configuring STP and RSTP on the ML-Series Card

STP Features

•Message age

•Identifier of the sending interface

•Values for the hello, forward delay, and max-age protocol timers

When a switch receives a configuration BPDU that contains superior information (lower bridge ID, lower path cost, etc.), it stores the information for that port. If this BPDU is received on the root port of the switch, the switch also forwards it with an updated message to all attached LANs for which it is the designated switch.

If a switch receives a configuration BPDU that contains inferior information to that currently stored for that port, it discards the BPDU. If the switch is a designated switch for the LAN from which the inferior BPDU was received, it sends that LAN a BPDU containing the up-to-date information stored for that port. In this way, inferior information is discarded, and superior information is propagated on the network.

A BPDU exchange results in these actions:

•One switch in the network is elected as the root switch.

•A root port is selected for each switch (except the root switch). This port provides the best path (lowest cost) when the switch forwards packets to the root switch.

•The shortest distance to the root switch is calculated for each switch based on the path cost.

•A designated switch for each LAN segment is selected. The designated switch incurs the lowest path cost when forwarding packets from that LAN to the root switch. The port through which the designated switch is attached to the LAN is called the designated port.

•Interfaces included in the spanning-tree instance are selected. Root ports and designated ports are put in the forwarding state.

•All interfaces not included in the spanning tree are blocked.

Election of the Root Switch

All switches in the Layer 2 network participating in the spanning tree gather information about other switches in the network through an exchange of BPDU data messages. This exchange of messages results in these actions:

•Election of a unique root switch for each spanning-tree instance

•Election of a designated switch for every switched LAN segment

•Removal of loops in the switched network by blocking Layer 2 interfaces connected to redundant links

For each VLAN, the switch with the highest switch priority (the lowest numerical priority value) is elected as the root switch. If all switches are configured with the default priority (32768), the switch with the lowest MAC address in the VLAN becomes the root switch. The switch priority value occupies the most significant bits of the bridge ID.

When you change the switch priority value, you change the probability that the switch will be elected as the root switch. Configuring a higher value decreases the probability; a lower value increases the probability.

The root switch is the logical center of the spanning-tree topology in a switched network. All paths that are not needed to reach the root switch from anywhere in the switched network are placed in the spanning-tree blocking mode.

Cisco ONS 15310-CL and Cisco ONS 15310-MA Ethernet Card Software Feature and Configuration Guide R8.5

 

78-18133-01

6-3

 

 

 

Page 70 Page 72
Image 71
Page 70 Page 72
Contents Text Part Number Americas HeadquartersCopyright 2007-2009 Cisco Systems, Inc. All rights reserved RPR Startup Configuration File Iii Configuring POS Interface Framing ModeUnderstanding VLANs Configuring Encapsulation over EtherChannel or POS Channel IP ACLs Vii Role of Sonet CircuitsViii Configuration GuidelinesUsing Technical Support C-1 Page 11-7 11-311-4 11-514-22 14-1314-17 14-1811-12 10-510-6 11-1117-8 13-317-7 Date PrefaceRevision History This section provides the following informationRelated Documentation Document ObjectivesAudience Italic Document ConventionsConvention Application BoldfaceWarnung Wichtige Sicherheitshinweise Bewaar Deze InstructiesAviso Instruções Importantes DE Segurança Avvertenza Importanti Istruzioni Sulla SicurezzaPage GEM Disse Anvisninger Viii Cisco Optical Networking Product Documentation CD-ROM Where to Find Safety and Warning InformationObtaining Optical Networking Information Page ML-Series Card Description Overview of the ML-Series CardIRB ML-Series Feature ListBundling the two POS ports LEX encapsulation only Cisco IOS Release 12.228SV Key ML-Series FeaturesCisco IOS GFP-F FramingRmon Link Aggregation FEC and POSTL1 Refresh CTC Operations on the ML-Series CardDisplaying ML-Series POS Statistics in CTC ML-Series POS Statistics Fields and ButtonsML-Series Ethernet Statistics Fields and Buttons Displaying ML-Series Ethernet Statistics in CTCButton Description CTC Provisioning Sonet Circuits Displaying Sonet AlarmsDisplaying J1 Path Trace 78-18133-01 Page Cisco IOS on the ML-Series Card Initial Configuration of the ML-Series CardHardware Installation Telnetting to the Node IP Address and Slot Number Opening a Cisco IOS Session Using CTCCTC Node View Showing IP Address Telnetting to a Management PortRJ-11 Pin RJ-45 Pin Connecting a PC or Terminal to the Console PortML-Series IOS CLI Console Port RJ-11 to RJ-45 Console Cable AdapterStartup Configuration File Router enable PasswordsConfiguring the Management Port Command PurposeNvram Configuring the HostnameClick the IOS startup config button Loading a Cisco IOS Startup Configuration File Through CTCDatabase Restore of the Startup Configuration File Cisco IOS Command ModesEnter the line console Mode What You Use It For How to Access PromptEnter the configure terminal Interface fastethernet 0 forGetting Help Using the Command ModesRouter# configure ? ExitPage MAC Addresses Configuring Interfaces on the ML-Series CardGeneral Interface Guidelines MLSeries# show interfaces fastethernet Interface Port IDMLSeriesconfig# interface fastethernet number Basic Interface ConfigurationMLSeries# configure terminal Configuring the Fast Ethernet Interfaces Basic Fast Ethernet and POS Interface ConfigurationConfiguring the POS Interfaces Hdlc Monitoring Operations on the Fast Ethernet InterfacesFCR Example 4-3 show controller Command OutputDaytona# show run interface fastethernet Example 4-4 show run interface Command OutputAvailable Circuit Sizes and Combinations Configuring POS on the ML-Series CardUnderstanding POS on the ML-Series Card Mbps STS-1 STS-1-1v STS-1-2v J1 Path Trace, and Sonet AlarmsLcas Support Ccat High Order Vcat High OrderGFP-F Framing Hdlc Framing Configuring the POS InterfaceEncapsulations LEX default Cisco Hdlc CRC Sizes Bit default None FCS disabledAdmindown Configuring POS Interface Framing ModeFraming mode changes on POS ports are Allowed only when the interface is shut downGFP default-The ML-Series card supports Sets the framing mode employed by the ONSNot a keyword choice in the command. The no Form of the command sets the framing modeConfiguring Sonet Alarms Sonet AlarmsAll -All alarms/signals Configuring Sonet Delay TriggersMonitoring and Verifying POS Hdlc Page These sections describe how the spanning-tree features work Configuring STP and Rstp on the ML-Series CardSTP Features Bridge Protocol Data Units STP OverviewSupported STP Instances Election of the Root Switch Bit Bridge ID, Switch Priority, and Extended System IDSpanning-Tree Timers Switch Priority ValueSpanning-Tree Interface States Creating the Spanning-Tree TopologySpanning-Tree Interface States Blocking StateForwarding State Disabled StateListening State Learning StateSpanning Tree and Redundant Connectivity Spanning-Tree Address ManagementSTP and Ieee 802.1Q Trunks Supported Rstp Instances Rstp FeaturesAccelerated Aging to Retain Connectivity Port State Comparison Port Roles and the Active TopologyIs Port Included Rapid Convergence Proposal and Agreement Handshaking for Rapid Convergence Synchronization of Port RolesRstp Bpdu Flags Bridge Protocol Data Unit Format and ProcessingBit Function Processing Inferior Bpdu Information Topology ChangesProcessing Superior Bpdu Information Interoperability with Ieee 802.1D STP Configuring STP and Rstp FeaturesDisabling STP and Rstp Default STP and Rstp ConfigurationFeature Default Setting Port-channel-number Configuring the Root SwitchConfiguring the Port Priority Configuring the Switch Priority of a Bridge Group Configuring the Path CostConfiguring the Hello Time Verifying and Monitoring STP and Rstp Status Configuring the Forwarding-Delay Time for a Bridge GroupConfiguring the Maximum-Aging Time for a Bridge Group Displays brief summary of STP or Rstp information Commands for Displaying Spanning-Tree StatusExample 6-1 show spanning-tree Commands Displays detailed STP or Rstp informationPage Understanding VLANs Configuring VLANs on the ML-Series CardConfiguring Ieee 802.1Q Vlan Encapsulation MLSeriesconfig-subif# end Ieee 802.1Q Vlan ConfigurationReturns to privileged Exec mode Optional Saves your configuration changes toBridging Ieee 802.1Q VLANs ML-Series#show vlans Example 7-2 Output for show vlans CommandMonitoring and Verifying Vlan Operation Page Understanding Ieee 802.1Q Tunneling Ieee 802.1Q Tunnel Ports in a Service-Provider Network FCS Configuring an Ieee 802.1Q Tunneling Port Configuring Ieee 802.1Q TunnelingIeee 802.1Q Tunneling and Compatibility with Other Features Ieee 802.1Q Example Untagged will be switched based on this bridge-group. OtherDisplays the tunnel ports on the switch Optional Saves your entries in the configuration fileVLAN-Transparent Service Versus VLAN-Specific Services VLAN-Transparent Services VLAN-Specific ServicesExample 8-2 MLSeries B Configuration Example 8-3applies to ML-Series card a Example 8-3 ML-Series Card a ConfigurationExample 8-5applies to ML-Series card C Example 8-4 ML-Series Card B ConfigurationExample 8-5 ML-Series Card C Configuration Example 8-4applies to ML-Series card BUnderstanding Layer 2 Protocol Tunneling Configuring Layer 2 Protocol TunnelingDefault Layer 2 Protocol Tunneling Configuration Default Layer 2 Protocol Tunneling ConfigurationLayer 2 Protocol Tunneling Configuration Guidelines 2shows the default Layer 2 protocol tunneling configurationConfiguring Layer 2 Tunneling on a Port Monitoring and Verifying Tunneling Status Configuring Layer 2 Tunneling Per-VLANUnderstanding Link Aggregation Configuring Link Aggregation on the ML-Series CardConfiguring Fast EtherChannel Configuring Link AggregationCisco IOS Configuration Fundamentals Configuration Guide EtherChannel Configuration ExampleAssigns an IP address and subnet mask to the POS Configuring POS ChannelConfigure one POS channel on the ML-Series card Creates the POS channel interface. You canPOS Channel Configuration Example Understanding Encapsulation over FEC or POS Channel Configuring Encapsulation over EtherChannel or POS ChannelEncapsulation over EtherChannel Example Configuration mode and enable otherSupported interface commands to meet Example 9-5 MLSeries a ConfigurationMonitoring and Verifying EtherChannel and POS Example 9-6 MLSeries B ConfigurationPort Load Balancing on the ML-Series cardsFor the Frame XOR Result Port ChannelEtherChannel Used MemberInterface for FrameFourth SecondFirst ThirdUsed Member This chapter includes the following major sections Configuring IRB on the ML-Series CardCisco IOS Command Reference publication Understanding Integrated Routing and Bridging10-2 Configuring IRB10-3 IRB Configuration Example10-4 Example 10-1 Configuring MLSeries aExample 10-2 Configuring MLSeries B Monitoring and Verifying IRB10-5 10-6 Field Description11-1 Configuring Quality of Service on the ML-Series Card11-2 IP Precedence and Differentiated Services Code PointUnderstanding QoS Priority Mechanism in IP and Ethernet11-3 Ethernet CoS11-4 ML-Series QoSClassification 11-5 PolicingMarking and Discarding with a Policer 11-6 QueuingScheduling 11-7 Control Packets and L2 Tunneled Protocols11-8 Egress Priority MarkingIngress Priority Marking QinQ Implementation11-9 QoS on RPRFlow Control Pause and QoS 11-10 Configuring QoSCreating a Traffic Class 11-11 Creating a Traffic PolicyMaximum of 40 alphanumeric characters Syntax of the class command isPolicy-map policy-nameno policy-map policy-name Class class-map-name no class class-map-name11-13 11-14 Command11-15 Attaching a Traffic Policy to an InterfaceTraffic class Monitoring and Verifying QoS ConfigurationConfiguring CoS-Based QoS Displays all configured traffic policies11-17 QoS Configuration Examples11-18 Traffic Classes Defined ExampleTraffic Policy Created Example Match spr1 Interface Example Example 11-6 Class Map Match All Command ExampleExample 11-7 Class Map Match Any Command Example Example 11-8 Class Map SPR Interface Command Example11-20 Example 11-9 ML-Series VoIP CommandsML-Series VoIP Example ML-Series Policing ExampleML-Series CoS-Based QoS Example Example 11-10 ML-Series Policing CommandsRouterconfig# class-map match-all policer Routerconfig# policy-map policef0ML-Series CoS Example 11-2211-23 Default Multicast QoS11-24 Configuring Multicast Priority Queuing QoSMulticast Priority Queuing QoS Restrictions 11-25 11-26 QoS not Configured on EgressML-Series Egress Bandwidth Example Bandwidth 11-2711-28 Understanding CoS-Based Packet StatisticsFast Ethernet Statistics Collected Interface Subinterface Vlan11-29 Configuring CoS-Based Packet StatisticsMLSeries# show interface pos0 cos Understanding IP SLA11-30 MLSeries# show interface fastethernet 0 cos11-31 IP SLA on the ML-SeriesIP SLA Restrictions on the ML-Series 11-32 12-1 Understanding the SDMUnderstanding SDM Regions Lookup Type Configuring SDMConfiguring SDM Regions Default SizeEntries Configuring Access Control List Size in TcamTask Command Monitoring and Verifying SDM12-4 13-1 Configuring Access Control Lists on ML-Series CardUnderstanding ACLs ML-Series ACL Support13-2 IP ACLsNamed IP ACLs User Guidelines13-3 Creating IP ACLsCreating Numbered Standard and Extended IP ACLs 13-4 Creating Named Standard IP ACLsCreating Named Extended IP ACLs Control Plane Only Applying the ACL to an InterfaceApplying ACL to Interface Controls access to an interfaceModifying ACL Tcam Size 13-513-6 14-1 Configuring Resilient Packet Ring on ML-Series CardUnderstanding RPR 14-2 Role of Sonet CircuitsPacket Handling Operations 14-3 Ring Wrapping14-4 RPR Framing ProcessRPR Frame for ML-Series Card DA-MAC and 0x00 for Unknown DA-MACRPR as the source 14-5CTM and RPR Configuring RPRMAC Address and Vlan Support RPR QoS14-7 Configuring CTC Circuits for RPRCTC Circuit Configuration Example for RPR Three-Node RPR Example 14-814-9 14-10 Configures a station ID. The user must configure aOptional Sets the RPR ring wrap mode to either wrap Immediate delayed14-11 Assigning the ML-Series Card POS Ports to the SPR Interface14-12 14-13 14-14 RPR Cisco IOS Configuration ExampleExample 14-1 SPR Station-ID 1 Configuration Example 14-2 SPR Station-ID 2 Configuration14-15 CRC Threshold Configuration and DetectionExample 14-3 SPR Station-ID 3 Configuration Example 14-5 Example of show run interface spr 1 Output Monitoring and Verifying RPR14-16 Example 14-4 Example of show interface spr 1 Output14-17 Add an ML-Series Card into an RPRThree-Node RPR After the Addition 14-1814-19 Adding an ML-Series Card into an RPR14-20 Cisco ONS 15454 Procedure GuideEnables the port Endpoint of the first newly created circuit14-21 Stop. You have completed this procedureDelete an ML-Series Card from an RPR Endpoint of the second newly created circuitThree-Node RPR Before the Deletion 14-2214-23 Deleting an ML-Series Card from an RPRLog into Adjacent Node 1 with CTC Double-click the ML-Series card in Adjacent Node14-24 Cisco Proprietary RPR Shortest Path Configuring Cisco Proprietary RPR KeepAliveConfiguring Shortest Path and Topology Discovery Cisco Proprietary RPR KeepAlive14-26 Redundant InterconnectMonitoring and Verifying Shortest Path andTopolgy Discovery Redundant Interconnect is only supported on 454 platforms15-1 Configuring Security for the ML-Series CardUnderstanding Security Understanding SSH Secure Login on the ML-Series CardDisabling the Console Port on the ML-Series Card Secure Shell on the ML-Series CardThis section has configuration information Configuring SSHConfiguration Guidelines Setting Up the ML-Series Card to Run SSH15-4 Configuring the SSH ServerRouter config# ip ssh timeout Displaying the SSH Configuration and StatusRouter # configure terminal Router config# ip ssh version 115-6 Radius Relay ModeRadius on the ML-Series Card 15-7 Radius Stand Alone ModeConfiguring Radius Relay Mode 15-8 Configuring RadiusUnderstanding Radius 15-9 Default Radius ConfigurationIdentifying the Radius Server Host 15-10 Switchconfig# radius-server host host1 Configuring AAA Login AuthenticationRouter# configure terminal Enter global configuration mode Router config# aaa new-model Enable AAA15-12 Router config# aaa authenticationRouter config# line console tty 15-13 Router config# end Return to privileged Exec modeRouter# show running-config Verify your entries Defining AAA Server GroupsRouter # show running-config Router config# aaa group serverRouter config-sg-radius# server Router config-sg-radius# end15-15 Radius15-16 Starting Radius Accounting15-17 Configuring a nas-ip-address in the Radius PacketConfiguring Settings for All Radius Servers 15-18 Default is 0 the range is 1 to 1440 minutesDeadtime minutes Marked as dead, the skipping will not take place15-19 Send accounting authentication15-20 Displaying the Radius Configuration16-1 Configuring Bridging on the ML-Series CardUnderstanding Bridging 16-2 Configuring Bridging16-3 For any statically configured forwarding entriesMonitoring and Verifying Bridging Brief displays summary information about spanning tree Displays detailed information about spanning treeBridge-group-number restricts the spanning tree information To specific bridge groups17-1 CE-100T-8 Ethernet OperationCE-100T-8 Overview Sonet17-2 CE-100T-8 Ethernet FeaturesAutonegotiation, Flow Control, and Frame Buffering 17-3 Ethernet Link Integrity Support17-4 Enhanced State Model for Ethernet and Sonet PortsIeee 802.1Q CoS and IP ToS Queuing CoS Priority Queue Mappings 17-5IP ToS Priority Queue Mappings 17-6 CE-100T-8 Sonet Circuits and FeaturesRmon and Snmp Support Statistics and Counters17-7 Ccat High Order Vcat High Order Vcat Low OrderNumber of STS-3c Circuits Maximum Number of STS-1 Circuits Maximum Number of STS-1-2v Circuits17-8 CE-100T-8 Maximum Service DensitiesCE-100T-8 STS/VT Allocation Tab 7x=1-12 6x=1-14 5x=1-16 =1-2117-9 CE-100T-8 Vcat Characteristics17-10 CE-100T-8 POS Encapsulation, Framing, and CRC17-11 CE-100T-8 Loopback, J1 Path Trace, and Sonet Alarms17-12 Command Reference for the ML-Series Card Rstp Related Commands bridge-groupDrpri-rstp IeeeRouter# clear counters Related Commands show interfaceClear counters Clock timezone Syntax Description Defaults Command Modes Usage GuidelinesNo clock auto Clock summertimeInterface spr Defaults Command ModesMLSeriesconfig-if # pos mode gfp fcs-disable No pos mode gfp fcs-disabledRelated Commands shutdown No pos pdi holdoff time Pos trigger defects No pos report alarmRelated Commands Non pos trigger defects condition Syntax Description DefaultsRelated Commands pos trigger delay Command is 50 milliseconds No pos trigger delay timeTime Delay time in milliseconds, 200 to Default value is 200 millisecondsImmediate No pos vcat defect immediate delayedDelayed Parameter DescriptionMLSeries# show controller pos 0 Interface POS0 Show controller pos interface-numberdetailsRelated Commands show interface pos Clear counters Show interface pos interface-number Use this command to display the status of the POS interfaceRelated Commands show controller pos Clear counters MLSeries# show ons alarm Show ons alarm78-18133-01 Vcg EqptSts MLSeries# show ons alarm defect sts Related Commands show controller pos Show ons alarm failuresML-Series#show ons alarm failure port MLSeries# show ons alarm failure eqptMLSeries# show ons alarm failure sts Interface spr Spr station-id Spr wrap Assigns the POS interface to the SPR interfacePort-based Related Commands interface sprNo spr load-balance auto port-based AutoSpr-intf-id Spr wrap Configures a station IDDefaultsN/A Following example sets an ML-Series card SPR station ID toInterface spr Spr-intf-id Spr station-id Spr wrap immediate delayedWraps RPR traffic after the carrier delay time expires Unsupported Global Configuration Commands Unsupported CLI Commands for the ML-Series CardUnsupported Privileged Exec Commands Page Unsupported POS Interface Configuration Commands Unsupported FastEthernet Interface Configuration Commands Unsupported Port-Channel Interface Configuration Commands Rate-limit Random-detect Timeout Tx-ring-limit Unsupported BVI Interface Configuration CommandsGathering Information About Your Internetwork Using Technical SupportGetting the Data from Your ML-Series Card Providing Data to Your Technical Support Representative Page IN-5 IN-6 IS,AINSIN-7 CRC RPRRstp SDM SSHIN-9 Rstp STPIN-10 See also framingGFP-F IN-11 LcasIN-12 POSRPR SDM IN-13 IN-14 RmonRstp IN-15 SnmpSee also Bpdu IN-16 TcamVcat VTP Layer 2 protocol tunneling Vty Configuring as Layer 2 tunnel Configuring Ieee 802.1QCustomer numbering in service-provider SDM STP and Rstp statusIN-18
Related manuals
Manual 8 pages 60.19 Kb Manual 352 pages 59.1 Kb

15310-CL, 15310-MA specifications

Cisco Systems has established itself as a leader in the networking domain, offering a wide array of solutions to meet the needs of modern businesses. Among its impressive product lineup are the Cisco 15310-CL and 15310-MA routers, designed to provide advanced network performance and reliability.

The Cisco 15310-CL is a versatile platform that primarily serves as a carrier-class router aimed at supporting high-speed data and voice services. It is built to handle the demands of large enterprises and service providers, offering a robust design that ensures maximum uptime and performance. One of its standout features is its modular architecture, which enables users to customize their configurations based on specific application needs. This scalability allows for future expansion without the need for a complete hardware overhaul.

Key technologies integrated into the Cisco 15310-CL include high-density Ethernet interfaces and a comprehensive suite of Layer 2 and Layer 3 protocol support. The device is capable of supporting multiple types of connections, including TDM, ATM, and Ethernet. This flexibility makes it an ideal choice for organizations that require seamless migration between various service types. Moreover, with features such as MPLS (Multiprotocol Label Switching) support and advanced Quality of Service (QoS) mechanisms, the router ensures that critical applications receive the necessary bandwidth and low latency required for optimal performance.

In contrast, the Cisco 15310-MA focuses on access solutions, providing a cost-effective entry point for businesses looking to enhance their network capabilities. It is well-suited for smaller offices or branch locations that need reliable connectivity without the expense and complexity associated with larger systems. The device supports a range of access methods and provides essential features like firewall capabilities, VPN support, and comprehensive security measures to protect sensitive data.

Both models benefit from Cisco's commitment to security and manageability, offering features like enhanced encryption protocols and user authentication mechanisms that help safeguard networks against threats. Additionally, they can be managed through Cisco’s intuitive software tools, simplifying configuration and monitoring tasks for IT administrators.

The Cisco 15310-CL and 15310-MA are ideal solutions for businesses seeking to enhance their network infrastructure, ensuring firms can keep pace with evolving technology demands while maintaining a focus on security and performance. Their combination of advanced features, modular capabilities, and robust support makes them valuable assets in the networking landscape.
Top Page Image Contents