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Moxa PM-7200-4MST-FL — understanding Communication Redundancy in Networking Protocols [36/36]
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Communication Redundancy STP/RSTP/MSTP
4-11
Port Role
Indicates the current port role status.
Setting
Port Role Status
Factory Default
Port Role
Backup
Alternate port
Root port
Designated port
Disable
None
Configuration Limits of STP/RSTP
The Spanning Tree Algorithm places limits on three of the configuration items described previously:
[Eq. 1]: 1 sec ≦ Hello Time ≦ 10 sec
[Eq. 2]: 6 sec ≦ Max. Age ≦ 40 sec
[Eq. 3]: 4 sec ≦ Forwarding Delay ≦ 30 sec
These three variables are further restricted by the following two inequalities:
[Eq. 4]: 2 x (Hello Time + 1 sec) ≦ Max. Age ≦ 2 x (Forwarding Delay – 1 sec)
Moxa EDS-600’s firmware will alert you immediately if any of these restrictions are violated. For example,
setting
Hello Time = 5 sec, Max. Age = 20 sec, and Forwarding Delay = 4 sec does not violate Eqs. 1 through 3, but
does violate Eq. 4, since in this case,
2 x (Hello Time + 1 sec) = 12 sec, and 2 x (Forwarding Delay – 1 sec) = 6 sec.
You can remedy the situation in many ways. One solution is simply to increase the Forwarding Delay value to
at least 11 sec.
HINT: Perform the following steps to avoid guessing:
Step 1: Assign a value to Hello Time and then calculate the left most part of Eq. 4 to get the lower limit of Max.
Age.
Step 2: Assign a value to Forwarding Delay and then calculate the right most part of Eq. 4 to get the upper
limit for Max. Age.
Step 3: Assign a value to Forwarding Delay that satisfies the conditions
Содержание
- User s manual p.1
- Communication redundancy p.1
- Www moxa com product p.1
- Fourth edition march 2015 p.1
- Trademarks p.2
- Technical support contact information p.2
- Disclaimer p.2
- Copyright notice p.2
- Communication redundancy p.2
- Www moxa com support p.2
- User s manual p.2
- Table of contents p.3
- Redundancy p.4
- Introduction to communication p.4
- Gigabit ethernet redundant ring capability 50 ms p.5
- Communication redundancy introduction to communication redundancy p.5
- Turbo ring p.6
- When the number of switches in the turbo ring is even p.7
- The turbo ring concept p.7
- Setting up turbo ring or turbo ring v2 p.7
- Determining the redundant path of a turbo ring ring p.7
- Communication redundancy turbo ring p.7
- Determining the redundant path of a turbo ring v2 ring p.8
- Communication redundancy turbo ring p.8
- Attention p.8
- When the number of switches in the turbo ring is odd p.8
- Ring coupling configuration p.8
- Ring coupling for a turbo ring v2 ring p.9
- Ring coupling for a turbo ring ring p.9
- Communication redundancy turbo ring p.9
- Attention p.9
- Turbo ring v2 p.10
- Dynamic ring coupling drc configuration applies only to p.10
- Dual ring for a turbo ring v2 ring p.11
- Dual ring configuration applies only to turbo ring v2 p.11
- Communication redundancy turbo ring p.11
- Attention p.11
- Dual homing configuration applies only to turbo ring v2 p.12
- Configuring turbo ring and turbo ring v2 p.12
- Configuring turbo ring p.12
- Communication redundancy turbo ring p.12
- Explanation of settings items p.13
- Explanation of current status items p.13
- Communication redundancy turbo ring p.13
- Communication redundancy turbo ring p.14
- Explanation of current status items p.15
- Configuring turbo ring v2 p.15
- Communication redundancy turbo ring p.15
- Explanation of settings items p.16
- Communication redundancy turbo ring p.16
- Communication redundancy turbo ring p.17
- Communication redundancy turbo ring p.18
- Explanation of ring status items p.19
- Configuring turbo ring v2 with dynamic ring coupling p.19
- Communication redundancy turbo ring p.19
- Explanation of drc status items p.20
- Communication redundancy turbo ring p.20
- Explanation of ring settings items p.20
- Turbo chain p.21
- The turbo chain concept p.22
- Setting up turbo chain p.22
- Communication redundancy turbo chain p.22
- Tail switch configuration p.23
- Member switch configuration p.23
- Head switch configuration p.23
- Explanation of current status items p.23
- Configuring turbo chain p.23
- Communication redundancy turbo chain p.23
- Explanation of settings items p.24
- Communication redundancy turbo chain p.24
- Communication redundancy turbo chain p.25
- Stp rstp mstp p.26
- Communication redundancy stp rstp mstp p.27
- What is stp p.27
- The stp rstp mstp concept p.27
- Stp requirements p.28
- How stp works p.28
- Communication redundancy stp rstp mstp p.28
- Stp reconfiguration p.29
- Stp configuration p.29
- Stp calculation p.29
- Differences between stp rstp and mstp p.29
- Communication redundancy stp rstp mstp p.29
- Stp example p.30
- Communication redundancy stp rstp mstp p.30
- Using stp on a network with multiple vlans p.31
- Configuring stp rstp p.31
- Communication redundancy stp rstp mstp p.31
- Communication redundancy stp rstp mstp p.32
- Configuring mstp p.33
- Communication redundancy stp rstp mstp p.33
- Communication redundancy stp rstp mstp p.34
- Communication redundancy stp rstp mstp p.35
- Configuration limits of stp rstp p.36
- Communication redundancy stp rstp mstp p.36
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Explore the essentials of communication redundancy, including STP, RSTP, and MSTP. Learn about port roles, configuration limits, and how to avoid common pitfalls.