Huawei Quidway S3000 Series Operation Manual
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Huawei Quidway S3000 Series Operation Manual

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Operation Manual - STP
Quidway S3000 Series Ethernet Switches
Chapter 1 RSTP Configuration..................................................................................................... 1-1
1.1 STP Overview .................................................................................................................... 1-1
1.1.1 Function of STP....................................................................................................... 1-1
1.1.2 Implement STP........................................................................................................ 1-1
1.1.3 Implement RSTP on Ethernet Switch...................................................................... 1-7
1.2 Configure RSTP................................................................................................................. 1-7
1.2.1 Enable/Disable RSTP on a Switch.......................................................................... 1-8
1.2.2 Enable/Disable RSTP on a Port.............................................................................. 1-8
1.2.3 Configure RSTP Operating Mode ........................................................................... 1-9
1.2.4 Set Priority of a Specified Bridge ............................................................................ 1-9
1.2.5 Specify the Switch as Primary or Secondary Root Switch.................................... 1-10
1.2.6 Set Forward Delay of a Specified Bridge .............................................................. 1-11
1.2.7 Set Hello Time of the Specified Bridge ................................................................. 1-12
1.2.8 Set Max Age of the Specified Bridge .................................................................... 1-12
1.2.9 Set Timeout Factor of the Bridge .......................................................................... 1-13
1.2.11 Set Specified Port to be an EdgePort ................................................................. 1-14
1.2.12 Set Path Cost of the Specified Port .................................................................... 1-14
1.2.13 Set the Priority of a Specified Port ...................................................................... 1-15
1.2.15 Set mCheck of the Specified Port ....................................................................... 1-16
1.2.16 Configure the Switch Security Function .............................................................. 1-17
1.3 Display and Debug RSTP................................................................................................ 1-18
1.4 RSTP Configuration Example.......................................................................................... 1-19
Chapter 2 MSTP Region-configuration ....................................................................................... 2-1
2.1 MSTP Overview ................................................................................................................. 2-1
2.1.1 MSTP Concepts ...................................................................................................... 2-1
2.1.2 MSTP Principles...................................................................................................... 2-4
2.2 Configure MSTP .............................................................................................................. 2-10
2.2.1 Configure the MST Region for a Switch................................................................ 2-11
2.2.2 Specify the Switch as Primary or Secondary Root Switch.................................... 2-13
2.2.3 Configure the MSTP Running Mode ..................................................................... 2-14
2.2.4 Configure the Bridge Priority for a Switch ............................................................. 2-15
2.2.5 Configure the Max Hops in an MST Region ......................................................... 2-15
2.2.6 Configure the Switching Network Diameter .......................................................... 2-16
2.2.7 Configure the Time Parameters of a Switch ......................................................... 2-16
2.2.8 Configure the Max Transmission Speed on a Port ............................................... 2-18

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  • Page 1: Table Of Contents

    Operation Manual - STP Quidway S3000 Series Ethernet Switches Table of Contents Table of Contents Chapter 1 RSTP Configuration..................... 1-1 1.1 STP Overview ........................1-1 1.1.1 Function of STP....................... 1-1 1.1.2 Implement STP......................1-1 1.1.3 Implement RSTP on Ethernet Switch..............1-7 1.2 Configure RSTP.........................
  • Page 2 Operation Manual - STP Quidway S3000 Series Ethernet Switches Table of Contents 2.2.9 Configure a Port as an Edge Port ................. 2-19 2.2.10 Configure the Path Cost of a Port ............... 2-20 2.2.11 Configure the Priority of a Port................2-21 2.2.12 Configure the Port (not) to Connect with the Point-to-Point Link ......

  • Page 3: Chapter 1 Rstp Configuration

    Operation Manual - STP Quidway S3000 Series Ethernet Switches Chapter 1 RSTP Configuration Chapter 1 RSTP Configuration 1.1 STP Overview 1.1.1 Function of STP Spanning Tree Protocol ( STP ) is applied in loop network to block some undesirable redundant paths with certain algorithms and prune the network into a loop-free tree, thereby avoiding the proliferation and infinite cycling of the packet in the loop network.
  • Page 4 Operation Manual - STP Quidway S3000 Series Ethernet Switches Chapter 1 RSTP Configuration Switch A Switch C Switch B Figure1-1 Designated switch and designated port For a switch, the designated switch is a switch in charge of forwarding packets to the local switch via a port called the designated port accordingly.
  • Page 5 Operation Manual - STP Quidway S3000 Series Ethernet Switches Chapter 1 RSTP Configuration Switch A with priority 0 Switch B with priority 1 Switch C with priority 2 Figure1-2 Ethernet switch networking To facilitate the descriptions, only the first four parts of the configuration BPDU are described in the example.
  • Page 6 Operation Manual - STP Quidway S3000 Series Ethernet Switches Chapter 1 RSTP Configuration received, the local BPDU is updated. And the optimum configuration BPDU will be elected through comparing the configuration BPDUs of all the ports. The comparison rules are: The configuration BPDU with a smaller root ID has a higher priority f the root IDs are the same, perform the comparison based on root path costs.
  • Page 7 Operation Manual - STP Quidway S3000 Series Ethernet Switches Chapter 1 RSTP Configuration BP1 receives the configuration BPDU from Switch A and finds that the received BPDU has a higher priority than the local one, so it updates its configuration BPDU.
  • Page 8 Operation Manual - STP Quidway S3000 Series Ethernet Switches Chapter 1 RSTP Configuration Thus the spanning tree is stabilized. The tree with the root Switch A is illustrated in the figure1-3 below. Switch A with priority 0 Switch B with priority 1...

  • Page 9: Implement Rstp On Ethernet Switch

    Operation Manual - STP Quidway S3000 Series Ethernet Switches Chapter 1 RSTP Configuration 1.1.3 Implement RSTP on Ethernet Switch The Ethernet Switch implements the Rapid Spanning Tree Protocol (RSTP), i.e., the enhancement of STP. The Forward Delay for the root ports and designated ports to enter forwarding state is greatly reduced in certain conditions, thereby shortening the time period for stabilizing the network topology.

  • Page 10: Enable/Disable Rstp On A Switch

    Operation Manual - STP Quidway S3000 Series Ethernet Switches Chapter 1 RSTP Configuration Set Forward Delay of a specified bridge Set Hello Time of the specified bridge Set Max Age of the specified bridge Set the maximum transmission speed of the specified port...

  • Page 11: Configure Rstp Operating Mode

    Operation Manual - STP Quidway S3000 Series Ethernet Switches Chapter 1 RSTP Configuration Table1-2 Enable/Disable RSTP on a port Operation Command Enable RSTP on a specified port stp enable Disable RSTP on a specified port stp disable Note that the redundancy route may be generated after RSTP is disabled on the Ethernet port.

  • Page 12: Specify The Switch As Primary Or Secondary Root Switch

    Operation Manual - STP Quidway S3000 Series Ethernet Switches Chapter 1 RSTP Configuration Table1-4 Set priority of a specified bridge Operation Command Set priority of a specified bridge stp priority bridge-priority Restore the default priority of specified bridge undo stp priority Note that if the priorities of all the bridges in the switching network are the same, the bridge with the smallest MAC address will be selected as the “root”.

  • Page 13: Set Forward Delay Of A Specified Bridge

    Operation Manual - STP Quidway S3000 Series Ethernet Switches Chapter 1 RSTP Configuration Note: To configure a switch as the root of the spanning tree instance, you can specify its priority as 0 or simply set it as the root, using the command.

  • Page 14: Set Hello Time Of The Specified Bridge

    Operation Manual - STP Quidway S3000 Series Ethernet Switches Chapter 1 RSTP Configuration 1.2.7 Set Hello Time of the Specified Bridge A bridge transmits hello packet regularly to the adjacent bridges to check if there is link failure. You can use the following command to set the Hello Time of a specified bridge.

  • Page 15: Set Timeout Factor Of The Bridge

    Operation Manual - STP Quidway S3000 Series Ethernet Switches Chapter 1 RSTP Configuration 1.2.9 Set Timeout Factor of the Bridge A bridge transmits hello packet regularly to the adjacent bridges to check if there is link failure. Generally, if the switch doesn’t receive the RSTP packets from the upstream switch for 3 times of hello time, the switch will decide the upstream switch is dead and will recalculate the topology of the network.

  • Page 16: Set Specified Port To Be An Edgeport

    Operation Manual - STP Quidway S3000 Series Ethernet Switches Chapter 1 RSTP Configuration By default, the maximum transmission speed is 3 (a counter value without unit) on all the Ethernet ports of the bridge. 1.2.11 Set Specified Port to be an EdgePort EdgePort is not connected to any switch directly or indirectly via the connected network.

  • Page 17: Set The Priority Of A Specified Port

    Operation Manual - STP Quidway S3000 Series Ethernet Switches Chapter 1 RSTP Configuration Table1-12 Set path cost of the specified port Operation Command Set path cost of the specified port stp cost cost Restore the default path cost of the specified port undo stp cost The path cost of Ethernet port is related to its link speed.

  • Page 18: Set Mcheck Of The Specified Port

    Operation Manual - STP Quidway S3000 Series Ethernet Switches Chapter 1 RSTP Configuration You can use the following command to configure a specified port to be connected to a point-to-point link. Perform the following configurations in Ethernet port view. Table1-14 Configure a specified port to be connected to a point-to-point link...

  • Page 19: Configure The Switch Security Function

    Operation Manual - STP Quidway S3000 Series Ethernet Switches Chapter 1 RSTP Configuration Table1-15 Set mCheck of the specified port Operation Command Set mCheck of the specified port stp mcheck This command can be used when the bridge runs RSTP in RSTP mode, but it cannot be used when the bridge runs RSTP in STP-compatible mode.

  • Page 20: Display And Debug Rstp

    Operation Manual - STP Quidway S3000 Series Ethernet Switches Chapter 1 RSTP Configuration Operation Command Restore the disabled Root protection state, as defaulted, (from undo stp root-protection Ethernet port view) Configure switch loop protection function (from Ethernet port view) stp loop-protection...

  • Page 21: Rstp Configuration Example

    Switch A can be a mid-range switch of Huawei, such as S5516 and S6500 Series Switches. Switch B and Switch C can be the low-end switches of Huawei, such as S3500 Series Switches. Switch D through Switch F can be the low-end switches of Huawei, such as S3000 Series, S2000 Series etc.
  • Page 22 Operation Manual - STP Quidway S3000 Series Ethernet Switches Chapter 1 RSTP Configuration III. Configuration procedure Configure Switch B # Enable RSTP globally. [Quidway] stp enable # The port RSTP defaults are enabled after global RSTP is enabled. You can disable RSTP on those ports that are not involved in RSTP calculation, however, be careful and do not disable those involved.
  • Page 23 Operation Manual - STP Quidway S3000 Series Ethernet Switches Chapter 1 RSTP Configuration [Quidway-Ethernet0/4] stp disable # To configure Switch C as a secondary root, you can either configure the Bridge priority of it as 4096 or simply use the command to specify it as the secondary root.
  • Page 24 Operation Manual - STP Quidway S3000 Series Ethernet Switches Chapter 1 RSTP Configuration # RSTP operating mode, time parameters, and port parameters take default values. 1-22...

  • Page 25: Chapter 2 Mstp Region-Configuration

    Operation Manual - STP Quidway S3000 Series Ethernet Switches Chapter 1 RSTP Configuration Chapter 2 MSTP Region-configuration 2.1 MSTP Overview Note: For Quidway series switches, MSTP feature is compatible to STP and RSTP, but if a switch supports RSTP, it will not support MSTP.
  • Page 26 Operation Manual - STP Quidway S3000 Series Ethernet Switches Chapter 1 RSTP Configuration Region A0 CIST: Common and Internal vlan 1 mapped to Instance 1 Spanning Tree vlan 2 mapped to Instance 2 MSTI: Multiple Spanning Tree Instance Other vlans mapped to CIST...
  • Page 27 Operation Manual - STP Quidway S3000 Series Ethernet Switches Chapter 1 RSTP Configuration IV. CST Common Spanning Tree (CST): Connects the spanning trees of all the MST region. Taking every MST region as a “switch”, the CST can be regarded as their spanning tree generated with STP/RSTP.

  • Page 28: Mstp Principles

    Operation Manual - STP Quidway S3000 Series Ethernet Switches Chapter 1 RSTP Configuration Master port is the port connecting the entire region to the Common Root Bridge and located on the shortest path between them. Alternate port is the backup of the master port. When the master port is blocked, the alternate port will take its place.
  • Page 29 Operation Manual - STP Quidway S3000 Series Ethernet Switches Chapter 1 RSTP Configuration II. MSTI calculation Inside an MST region, MSTP generates different MSTIs for different VLANs according to the association between VLAN and the spanning tree. The calculation process of MSTI is same like RSTP.
  • Page 30 Operation Manual - STP Quidway S3000 Series Ethernet Switches Chapter 1 RSTP Configuration Switch A and the designated port is AP1. Also in the figure above, Switch B and Switch C are connected to the LAN and Switch B forwards packets to LAN. So the designated switch of LAN is Switch B and the designated port is BP2.
  • Page 31 Operation Manual - STP Quidway S3000 Series Ethernet Switches Chapter 1 RSTP Configuration Switch B: Configuration BPDU of BP1: {1, 0, 1, BP1} Configuration BPDU of BP2: {1, 0, 1, BP2} Switch C: Configuration BPDU of CP2: {2, 0, 2, CP2}...
  • Page 32 Operation Manual - STP Quidway S3000 Series Ethernet Switches Chapter 1 RSTP Configuration AP1 receives the configuration BPDU from Switch B and finds out that the local configuration BPDU priority is higher than that of the received one, so it discards the received configuration BPDU.
  • Page 33 Operation Manual - STP Quidway S3000 Series Ethernet Switches Chapter 1 RSTP Configuration CP2 will receive the updated configuration BPDU, {0, 5, 1, BP2}, from Switch B. Since this configuration BPDU is better then the old one, the old BPDU will be updated to {0, 5, 1, BP2}.

  • Page 34: Configure Mstp

    Operation Manual - STP Quidway S3000 Series Ethernet Switches Chapter 1 RSTP Configuration initiated to generate a new path to replace the failed one and thus restore the network connectivity. However, the new configuration BPDU as now recalculated will not be propagated throughout the network right away, so the old root ports and designated ports that have not detected the topology change will still forward the data through the old path.

  • Page 35: Configure The Mst Region For A Switch

    Operation Manual - STP Quidway S3000 Series Ethernet Switches Chapter 1 RSTP Configuration display active-region-configuration command shows the parameters configured before MSTP is enabled. For those configured after MSTP is enabled, you can use the related display commands to display. For detailed information, refer to the “Display and Debug MSTP”...
  • Page 36 Operation Manual - STP Quidway S3000 Series Ethernet Switches Chapter 1 RSTP Configuration Table2-2 Configure the MST region for a switch Operation Command Configure MST region name region-name name Restore the default MST region name undo region-name Configure VLAN mapping table...

  • Page 37: Specify The Switch As Primary Or Secondary Root Switch

    Operation Manual - STP Quidway S3000 Series Ethernet Switches Chapter 1 RSTP Configuration 2.2.2 Specify the Switch as Primary or Secondary Root Switch MSTP can determine the spanning tree root through calculation. You can also specify the current switch as the root, using the command provided by the switch.

  • Page 38: Configure The Mstp Running Mode

    Operation Manual - STP Quidway S3000 Series Ethernet Switches Chapter 1 RSTP Configuration You can configure more than one secondary root for a spanning tree through specifying the secondary STI root on two or more switches. Generally, you are recommended to designate one primary root and more than one secondary roots for a spanning tree.

  • Page 39: Configure The Max Hops In An Mst Region

    Operation Manual - STP Quidway S3000 Series Ethernet Switches Chapter 1 RSTP Configuration You can use the following command to configure the Bridge priorities of the designated switch in different STIs. Perform the following configuration in system view. Table2-6 Configure the Bridge priority for a switch...

  • Page 40: Configure The Switching Network Diameter

    Operation Manual - STP Quidway S3000 Series Ethernet Switches Chapter 1 RSTP Configuration The more the hops in an MST region, the larger the scale of the region. Only the max hops configured on the region root can limit the scale of MST region. Other switches in the MST region also apply the configurations on the region root, even if they have been configured with max hops.
  • Page 41 Operation Manual - STP Quidway S3000 Series Ethernet Switches Chapter 1 RSTP Configuration period of time during which the new configuration BPDU can be propagated throughout the network. The switch sends Hello packet periodically at an interval specified by Hello Time to check if there is any link fault.

  • Page 42: Configure The Max Transmission Speed On A Port

    Operation Manual - STP Quidway S3000 Series Ethernet Switches Chapter 1 RSTP Configuration To avoid frequent network flapping, the values of Hello Time, Forward Delay and Maximum Age should guarantee the following formulas equal. 2 * (forward-delay - 1seconds) >= maximum-age maximum-age >= 2 * (hello + 1.0 seconds)

  • Page 43: Configure A Port As An Edge Port

    Operation Manual - STP Quidway S3000 Series Ethernet Switches Chapter 1 RSTP Configuration You can configure the max transmission speed on a port with either of the above-mentioned measures. For more about the commands, refer to the Command Manual. This parameter only takes a relative value without units. If it is set too large, too many packets will be transmitted during every Hello Time and too many network resourced will be occupied.

  • Page 44: Configure The Path Cost Of A Port

    Operation Manual - STP Quidway S3000 Series Ethernet Switches Chapter 1 RSTP Configuration enabled on the switch, the configured edge port will turn into non-edge port again when it receives BPDU from other port. In the case that BPDU protection is enabled, the port will be disabled.

  • Page 45: Configure The Priority Of A Port

    Operation Manual - STP Quidway S3000 Series Ethernet Switches Chapter 1 RSTP Configuration Table2-15 Configure the Path Cost of a port Operation Command Configure the Path Cost of a port stp [ instance instance-id ] cost cost Restore the default path cost of a port.

  • Page 46: Configure The Port (Not) To Connect With The Point-To-Point Link

    Operation Manual - STP Quidway S3000 Series Ethernet Switches Chapter 1 RSTP Configuration Table2-17 Configure the port priority Operation Command Configure the port priority. stp [ instance instance-id ] port priority priority Restore the default port priority. undo stp [ instance instance-id ] port priority You can configure the port priority with either of the above-mentioned measures.

  • Page 47: Configure The Mcheck Variable Of A Port

    Operation Manual - STP Quidway S3000 Series Ethernet Switches Chapter 1 RSTP Configuration Table2-19 Configure the port (not) to connect with the point-to-point link Operation Command Configure the port to connect with the point-to-point link. stp point-to-point force-true Configure the port not to connect with the point-to-point link.

  • Page 48: Configure The Switch Security Function

    Operation Manual - STP Quidway S3000 Series Ethernet Switches Chapter 1 RSTP Configuration You can use the following measure to perform mCheck operation on a port. I. Configure in system view Perform the following configuration in system view. Table2-20 Configure the mCheck variable of a port...
  • Page 49 Operation Manual - STP Quidway S3000 Series Ethernet Switches Chapter 1 RSTP Configuration high-speed link may be pulled to the low-speed link and congestion will occur on the network. Root protection function is used against such problem. The root port and other blocked ports maintain their state according to the BPDUs send by uplink switch.

  • Page 50: Enable Mstp On The Device

    Operation Manual - STP Quidway S3000 Series Ethernet Switches Chapter 1 RSTP Configuration By default, the switch does not enable BPDU protection or Root protection. For more about the configuration commands, refer to the Command Manual. 2.2.15 Enable MSTP on the Device You can use the following command to enable MSTP on the device.

  • Page 51: Display And Debug Mstp

    Operation Manual - STP Quidway S3000 Series Ethernet Switches Chapter 1 RSTP Configuration Table2-25 Enable/Disable MSTP on a port Operation Command Enable MSTP on a port. stp enable Disable MSTP on a port. stp disable Restore the default MSTP state on the port.

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