Moxa ICS-G7852-4XG-HV-HV — understanding STP/RSTP/MSTP for VLAN Communication [31/36]
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Communication Redundancy STP/RSTP/MSTP
4-6
Using STP on a Network with Multiple VLANs
IEEE Std 802.1D, 1998 Edition, does not take into account VLANs when calculating STP information—the
calculations only depend on the physical connections. Consequently, some network configurations will result in
VLANs being subdivided into a number of isolated sections by the STP system. You must ensure that every
VLAN configuration on your network takes into account the expected STP topology and alternative topologies
that may result from link failures.
The following figure shows an example of a network that contains VLANs 1 and 2. The VLANs are connected
using the 802.1Q-tagged link between switch B and Switch C. By default, this link has a port cost of 100 and
is automatically blocked because the other switch-to-switch connections have a port cost of 36 (18+18). This
means that both VLANs are now subdivided—VLAN 1 on switches A and B cannot communicate with VLAN 1 on
switch C, and VLAN 2 on switches A and C cannot communicate with VLAN 2 on switch B.
To avoid subdividing VLANs, all inter-switch connections should be made members of all available 802.1Q
VLANs. This will ensure connectivity at all times. For example, the connections between switches A and B, and
between switches A and C, should be 802.1Q tagged and carrying VLANs 1 and 2 to ensure connectivity.
Configuring STP/RSTP
The following figures indicate which Spanning Tree Protocol parameters can be configured. A more detailed
explanation of each parameter follows.
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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Learn how to effectively manage STP in networks with multiple VLANs. Ensure proper connectivity and avoid isolation of VLANs through correct configurations.