Huawei Switch How To - Configuring basic STP functions

HUAWEI SWITCH S5700 - HOW TO

Configuring basic STP functions

HUAWEI SWITCH S5700 HOW TO



General infos and application environment

Network designers tend to deploy multiple physical links between two

devices (one link is the master and the others are backups) to fulfill

network redundancy requirements. Loops are bound to occur on such

types of complex networks.

Loops will cause broadcast storms, which exhaust network resources

and paralyze the network. Loops also cause MAC address flapping

that damages MAC address entries.

STP can be deployed on a network to eliminate loops by blocking

some ports.

We will use a simple network scenario (see the picture) to show how

basic STP functions work. In our example, after SwitchA, SwitchB,

SwitchC, and SwitchD running STP discover loops by exchanging

information, they trim the ring topology into a loop-free tree topology

by blocking a certain port. STP prevents replication and circular

propagation of packets on the network and the release the switching

devices from processing duplicate packets, improving their processing

performance.

SwitchA

Root

Bridge

GE 0/0/1

SwitchB SwitchC

SwitchD

PC1

10.1.1.2/24

PC2

10.1.1.3/24

GE 0/0/1

GE 0/0/2 GE 0/0/2

GE 0/0/3 GE 0/0/3

GE 0/0/1 GE 0/0/1

STP

Blocked port

GE 0/0/2 GE 0/0/2



Configuring the STP mode for the ring network

<Huawei> system-view

[Huawei] sysname SwitchA

[SwitchA] stp mode stp

1. Configure the STP mode for all the switches Enter the configuration view

Configure the switch name

Configure the STP mode


[Huawei] sysname SwitchB

[SwitchB] stp mode stp


[Huawei] sysname SwitchC

[SwitchC] stp mode stp <Huawei> system-view

[Huawei] sysname SwitchD

[SwitchD] stp mode stp



Configuring root bridges and blocking ports

2. Configure primary (SwitchA) and secondary (SwitchD) root bridges

Configure the primary root bridge

Configure the secondary root bridge

Enter the interface view

Configure the interface path cost

[SwitchA] stp root primary

[SwitchD] stp root secondary

3. Configure the ports to be blocked (GE0/0/1 of SwitchC)

[SwitchC] interface gigabitethernet 0/0/1

[SwitchC-GigabitEthernet0/0/1] stp cost 200000

[SwitchC-GigabitEthernet0/0/1] quit Exit the interface view



Enabling STP to eliminate loops (1)

4. Disable STP on interfaces connected to PC Enter the interface view

Disable STP on the interface

Enable STP on the switch

Exit the interface view

[SwitchB] interface gigabitethernet 0/0/2

[SwitchB-GigabitEthernet0/0/1] stp disable

[SwitchB-GigabitEthernet0/0/1] quit [SwitchC] interface gigabitethernet 0/0/2

[SwitchC-GigabitEthernet0/0/2] stp disable

[SwitchC-GigabitEthernet0/0/2] quit

5. Enable STP globally on all the switches

[SwitchA] stp enable

[SwitchB] stp enable

[SwitchC] stp enable

[SwitchD] stp enable




6. Enable BPDU on all the interfaces except the interfaces connected to terminals

[SwitchA] interface gigabitethernet 0/0/1

[SwitchA-GigabitEthernet0/0/1] bpdu enable

[SwitchA-GigabitEthernet0/0/1] quit

[SwitchA] interface gigabitethernet 0/0/2

[SwitchA-GigabitEthernet0/0/2] bpdu enable

[SwitchA-GigabitEthernet0/0/2] quit


Enable the BPDU



[SwitchB-GigabitEthernet0/0/1] bpdu enable

[SwitchB-GigabitEthernet0/0/1] quit


[SwitchB-GigabitEthernet0/0/3] bpdu enable

[SwitchB-GigabitEthernet0/0/3] quit





[SwitchC-GigabitEthernet0/0/1] bpdu enable



[SwitchC-GigabitEthernet0/0/3] bpdu enable



Enable the BPDU


[SwitchD] interface gigabitethernet 0/0/1

[SwitchD-GigabitEthernet0/0/1] bpdu enable

[SwitchD-GigabitEthernet0/0/1] quit

[SwitchD] interface gigabitethernet 0/0/2

[SwitchD-GigabitEthernet0/0/2] bpdu enable

[SwitchD-GigabitEthernet0/0/2] quit



Checking the configuration 7. Check the stp configuration on all the switches

[SwitchA] display stp brief

MSTID Port Role STP State Protection

0 GigabitEthernet0/0/1 DESI FORWARDING NONE


[Huawei] [SwitchB] display stp brief



0 GigabitEthernet0/0/3 ROOT FORWARDING NONE

[SwitchB]

[SwitchC] display stp brief


0 GigabitEthernet0/0/1 ALTE DISCARDING NONE


[SwitchC] [SwitchD] display stp brief




[SwitchD]



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Huawei Switch How To - Configuring basic STP functions

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Transcript of Huawei Switch How To - Configuring basic STP functions