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MSTP & VRRP solution

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Post time 2021-9-20 19:58:20 | Show all posts |Read mode

Two common deployment patterns of MSTP+VRRP

1. MSTP with single instance:

As figure shown below, SW1 is the root bridge for MSTP instance 0 to which all vlans are mapped and master VRRP gateway for all vlans. This deployment patterns of MSTP is almost the same to RSTP.

Merit: Easier maintenance and implementation

Demerit:SW2 is the second root and backup VRRP gateway which doesn't forward any traffic .It is a waste of network resource.

                                               

2. MSTP with Multiple instances:

As figure shown below, SW1 is the root bridge for MSTP instance 1 and secondary root for instance

2. SW2 is Root Bridge for MSTP instance 2 and secondary root for instance 1. MSTP instance 1 includes VLAN 10, 60 and 80 and instance 2 includes VLAN 20, 30 and 70.

SW1 is the master VRRP gateway for VLAN 10, 60 and 80 and the backup VRRP gateway for VLAN 20, 30 and 70. SW2 is the master VRRP gateway for VLAN 20, 30 and 70 and the backup gateway for VLAN 10, 60 and 80.

Merit:Fully occupy network resource

Demerit:More complicated configuration and maintenance than MSTP with single instance

Configuring MSTP with single instance


Note:

The deployment pattern of "MSTP + VRRP" is replaced by deployment pattern of VSU day by day and we suggest you to apply VSU if possible. Even so, deployment pattern of "MSTP + VRRP" is still a fallback method to ensure a redundant and reliable network if core and distribution switches don't support VSU

We suggest you to remove some interconnection links first to avoid a Layer 2 loop


I. Network Topology

SW1 is the master VRRP gateway for users on all vlans, and SW2 is the backup VRRP gateway for users on all vlans. Connect SW1 and SW2 through an Aggregate port to ensure reliability and configure this AP as Trunk port.


The IP address of SW1 on VLANs from 10 to 80 are 192.168.10.1 to 192.168.80.1 , and IP address of SW2 on VLANs from 10 to 80 are 192.168.10.2 to 192.168.80.2 , and VRRP IP address are 192.168.10.254 to 192.168.80.254.


II. Configuration Steps



Configuring SW1


(1) Configure MSTP

Ruijie#config terminal

Ruijie(config)#spanning-tree mst 0 priority 0   ------>instance id=0 , priority=0(The lower the number, the more likely the switch will be chosen as the root bridge) by default , all vlans are mapped to instance 0 .

Ruijie(config)#spanning-tree        ------>enable STP feature and the default STP mode is MSTP

Ruijie(config)#exit


(2) Configuring AP

Ruijie#config terminal

Ruijie(config)#interface aggregateport 1

Ruijie(config-if-AggregatePort 1)#switchport mode trunk

Ruijie(config-if-AggregatePort 1)#exit

Ruijie(config)#interface tengigabitEthernet 3/1                       

Ruijie(config-if-TenGigabitEthernet 3/1)#port-group 1

Ruijie(config-if-TenGigabitEthernet 3/1)#exit

Ruijie(config)#interface tengigabitEthernet 3/2     

Ruijie(config-if-TenGigabitEthernet 3/2)#port-group 1

Ruijie(config-if-TenGigabitEthernet 3/2)#exit

Ruijie(config)#interface range gigabitEthernet 1/1-5  

Ruijie(config-if-range)#switchport mode trunk      ----->don't forget to prune trunk port


(3) Configuring VRRP

Ruijie(config)#vlan 10

Ruijie(config)#inter vlan 10

Ruijie(config-if-VLAN 10)#ip address 192.168.10.1 255.255.255.0

Ruijie(config-if-VLAN 10)#vrrp 10 ip 192.168.10.254

Ruijie(config-if-VLAN 10)#vrrp 10 priority 120            ------> vrrp group id=10 , priority value=120 (the bigger the number , the more likely the switch will be chosen as the  master ,and default value is 100)

Ruijie(config-if-VLAN 10)#exit

Ruijie(config)#vlan 20

Ruijie(config)#inter vlan 20

Ruijie(config-if-VLAN 20)#ip address 192.168.20.1 255.255.255.0

Ruijie(config-if-VLAN 20)#vrrp 20 ip 192.168.20.254

Ruijie(config-if-VLAN 20)#vrrp 20 priority 120

Ruijie(config-if-VLAN 20)#exit

...........configuration of VLAN 30 ~ VLAN 70 are omitted............

Ruijie(config)#vlan 80

Ruijie(config)#inter vlan 80

Ruijie(config-if-VLAN 80)#ip address 192.168.80.1 255.255.255.0

Ruijie(config-if-VLAN 80)#vrrp 80 ip 192.168.80.254

Ruijie(config-if-VLAN 80)#vrrp 80 priority 120

Ruijie(config-if-VLAN 80)#exit


Configuring SW2


(1)Configure MST

Ruijie#config terminal

Ruijie(config)#spanning-tree mst 0 priority 4096   ------>instance id=0 , priority=4096(The lower the number, the more likely the switch will be chosen as the root bridge) by default , all vlans are mapped to instance 0

Ruijie(config)#spanning-tree        ------>enable STP feature and default mode is MSTP

Ruijie(config)#exit


(2) Configuring AP

Ruijie#config terminal

Ruijie(config)#interface aggregateport 1

Ruijie(config-if-AggregatePort 1)#switchport mode trunk

Ruijie(config-if-AggregatePort 1)#exit

Ruijie(config)#interface tengigabitEthernet 3/1                       

Ruijie(config-if-TenGigabitEthernet 3/1)#port-group 1

Ruijie(config-if-TenGigabitEthernet 3/1)#exit

Ruijie(config)#interface tengigabitEthernet 3/2              

Ruijie(config-if-TenGigabitEthernet 3/2)#port-group 1

Ruijie(config-if-TenGigabitEthernet 3/2)#exit

Ruijie(config)#interface range gigabitEthernet 1/1-5  

Ruijie(config-if-range)#switchport mode trunk  ----->don't forget to prune trunk port


(3) Configuring VRRP

Ruijie(config)#vlan 10

Ruijie(config)#inter vlan 10

Ruijie(config-if-VLAN 10)#ip address 192.168.10.2 255.255.255.0

Ruijie(config-if-VLAN 10)#vrrp 10 ip 192.168.10.254         ------>vrrp group id=10 , priority value remains default setting(the bigger the number , the more likely the switch will be chosen as the  master ,and default value is 100)

Ruijie(config-if-VLAN 10)#exit

Ruijie(config)#vlan 20

Ruijie(config)#inter vlan 20

Ruijie(config-if-VLAN 20)#ip address 192.168.20.2 255.255.255.0

Ruijie(config-if-VLAN 20)#vrrp 20 ip 192.168.20.254

Ruijie(config-if-VLAN 20)#exit

...........configuration of VLAN 30 ~ VLAN 70 are omitted............

Ruijie(config)#vlan 80

Ruijie(config)#inter vlan 80

Ruijie(config-if-VLAN 80)#ip address 192.168.80.2 255.255.255.0

Ruijie(config-if-VLAN 80)#vrrp 80 ip 192.168.80.254

Ruijie(config-if-VLAN 80)#exit




Configuring SW11,SW12,S13,S14,S15,S16


Ruijie#config terminal

Ruijie(config)#interface range gigabitEthernet 0/25-26  

Ruijie(config-if-range)#switchport mode trunk

Ruijie(config-if-range)#exit

Ruijie(config)#spanning-tree   ------>enable STP feature and default mode is MSTP

Ruijie(config)#exit


If we want to manully conduct MSTP to put G0/25 on SW11 and SW12 in forwarding state , we can assign a higher cost value to G0/26  , then MSTP blocks G0/26. (If a loop occurs, MST uses the path cost when selecting an interface to place into the forwarding state. A lower path cost represents higher-speed transmission)


Ruijie(config)#interface gi0/26

Ruijie(config-if-GiagaEthernet 0/26)#spanning-tree cost 200000    ------>the default value is derived from the media speed of the interface , and the cost value of an 1000M port is 20000

Ruijie(config-if-GiagaEthernet 0/26)#exit


Connectting cable and verifying status of STP and VRRP


Ruijie#show spanning-tree

StpVersion : MSTP

SysStpStatus : ENABLED

MaxAge : 20

HelloTime : 2

ForwardDelay : 15

BridgeMaxAge : 20

BridgeHelloTime : 2

BridgeForwardDelay : 15

MaxHops: 20

TxHoldCount : 3

PathCostMethod : Long

BPDUGuard : Disabled

BPDUFilter : Disabled

LoopGuardDef  : Disabled

###### mst 0 vlans map : ALL

BridgeAddr : 1414.4b19.ecc0 ------>local MAC address

Priority: 0

TimeSinceTopologyChange : 12d:0h:19m:46s

TopologyChanges : 0

DesignatedRoot : 0.1414.4b19.ecc0  ------>root MAC address

RootCost : 0  

RootPort : 0

CistRegionRoot : 0.1414.4b19.ecc0

CistPathCost : 0


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