Figure 9-2 Networking for the application of MSTP in MLAG
Configuration Steps
Step 1: Add the interface to the aggregation group and add to the VLAN. (omitted)
Step 2: Configure the MLAG domain. (omitted)
Step 3: Configure the MST domain.
#Configure the MST domain on Device1, configure the domain name as admin and the revision level as 1 to activate the MST domain.
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Device1#configure terminal
Device1(config)#spanning-tree mst configuration
Device1(config-mst)#region-name admin
Device1(config-mst)#revision-level 1
Device1(config-mst)#active configuration pending
Device1(config-mst)#exit
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The MST domain configuration of Device2, SD, and DHD is the same as Device1. (omitted)
View the details of each device spanning tree.
#Aggregation 1 on Device1 and Device2 is the interconnection port.
Device1#show spanning-tree
Spanning-tree enabled protocol mstp
MST Instance 00 vlans mapped: 1-4094
Bridge address 0001.7a95.000b priority 0
Region root address 0001.7a95.000b priority 0
Designated root address 0001.7a95.000b priority 0
root: 0, rpc: 0, epc: 0, hop: 20
We are the root of the spanning tree
Operational hello time 2, forward time 15, max age 20, message age 0
Configured hello time 2, forward time 15, max age 20, max hops 20, hold count 10
Flap guard : admin false, max count 5, detect period 10s, recovery period 30s
Tc protection: admin true, threshold 2, interval 20s, rxTcCnt 0, status:NORMAL
ARL flush: enabled
Bpdu length-check: false, bpdu illegal length packets count: 0
Autoedge swap-check: true
Swap-delay time: 30
Configured timer factor: 3
Topology Change Count:6, last change occured:118 weeks 5 days(71863322 seconds)
Interface Role Sts Cost Prio.Nbr Type
-------------------------------------------------
te0/1 Desg FWD 20000 128.0036 P2P
link-agg1 Desg FWD 1950 128.0193 P2P (MLAG peer-link)
link-agg30 Desg FWD 19500 128.0222 P2P (MLAG 100)
Device2#show spanning-tree
Spanning-tree enabled protocol mstp
MST Instance 00 vlans mapped: 1-4094
Bridge address 0001.7a95.000b priority 0
Region root address 0001.7a95.000b priority 0
Designated root address 0001.7a95.000b priority 0
root: 0, rpc: 0, epc: 0, hop: 20
We are the root of the spanning tree
Operational hello time 2, forward time 15, max age 20, message age 0
Configured hello time 2, forward time 15, max age 20, max hops 20, hold count 6
Flap guard : admin false, max count 5, detect period 10s, recovery period 30s
Tc protection: admin true, threshold 1, interval 4s, rxTcCnt 0, status:NORMAL
ARL flush: enabled
Bpdu length-check: false, bpdu illegal length packets count: 0
Autoedge swap-check: true
Swap-delay time: 30
Configured timer factor: 3
Topology Change Count:7, last change occured:118 weeks 4 days(71776558 seconds)
Interface Role Sts Cost Prio.Nbr Type
------------------------------------------------
gi0/1 Desg FWD 20000 128.0332 P2P
link-agg1 IRoot FWD 1950 128.0385 P2P (MLAG peer-link)
link-agg30 Desg FWD 19500 128.0414 P2P (MLAG 100)
#SD connects the port of Device2 and the spanning tree calculation is block, and the mlag-group of DHD is Root.
SD#show spanning-tree
Spanning-tree enabled protocol mstp
MST Instance 00 vlans mapped: 1-4094
Bridge address 0001.7a7a.3c10 priority 32768
Region root address 0001.7a95.000b priority 0
Designated root address 0001.7a95.000b priority 0
root: 32804, rpc: 20000, epc: 0, hop: 19
Operational hello time 2, forward time 15, max age 20, message age 0
Configured hello time 2, forward time 15, max age 20, max hops 20, hold count 6
Flap guard : admin false, max count 5, detect period 10s, recovery period 30s
Tc protection: admin true, threshold 1, interval 4s, rxTcCnt 0, status:NORMAL
ARL flush: enabled
Bpdu length-check: false, bpdu illegal length packets count: 0
Autoedge swap-check: true
Swap-delay time: 30
Configured timer factor: 1
Topology Change Count:36, last change occured:118 weeks 5 days(71863036 seconds)
Interface Role Sts Cost Prio.Nbr Type
---------------------------------------------
gi0/1 Root FWD 20000 128.0012 P2P
gi0/2 Alte DIS 20000 128.0036 P2P
DHD#show spanning-tree
Spanning-tree enabled protocol mstp
MST Instance 00 vlans mapped: 1-4094
Bridge address 0001.7a6a.0148 priority 32768
Region root address 0001.7a95.000b priority 0
Designated root address 0001.7a95.000b priority 0
root: 33662, rpc: 18000, epc: 0, hop: 19
Operational hello time 2, forward time 15, max age 20, message age 0
Configured hello time 2, forward time 15, max age 20, max hops 20, hold count 6
Flap guard : admin false, max count 5, detect period 10s, recovery period 30s
Tc protection: admin true, threshold 1, interval 4s, rxTcCnt 0, status:NORMAL
ARL flush: enabled
Bpdu length-check: false, bpdu illegal length packets count: 0
Autoedge swap-check: true
Swap-delay time: 30
Configured timer factor: 6
Topology Change Count:20, last change occured:118 weeks 5 days(71863409 seconds)
Interface Role Sts Cost Prio.Nbr Type
---------------------------------------------
link-agg30 Root FWD 18000 128.0894 P2P
Step 4: Modify the priority of the specified bridge of Device2, so that the blocked port of SA is calculated as 0/1.
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Device2#conf t
Device2(config)#spanning-tree pseudo-information
Device2 (config-stp-pseudo)#mst instance 0 designated-priority 4096
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