Spanning tree blocking vlan example. By default, the device runs the Rapid PVST+ protocol.

Spanning tree blocking vlan example Spanning Tree Protocol (STP) ensures a loop-free topology in a local area network (LAN) made up of switches. 1D standard defines only one spanning-tree instance for the entire switched network, regardless of the number of VLANs. Spanning-Tree BPDUGuard Nov 1, 2024 · The cost is based on the speed of the links; for example, a 1 Gbps link may have a lower cost than a 10 Mbps link. Spanning tree uses the extended system ID, the device priority, and the allocated spanning-tree MAC address to make the bridge ID unique for each VLAN. 0. show spanning-tree interface <IF_NAME> show spanning-tree interface <IF_NAME> detail . WS-C3750E-48PD#show The show spanning-tree active and show spanning-tree brief commands are used to see the spanning tree configuration and status, including which ports are currently blocking and which ports are forwarding for each VLAN on the switch. interface Vlan10. Bridge ID Priority 33390 (priority 32768 sys-id-ext 622) Address spanning-tree mst configuration EntersMSTconfigurationmode. Virtual Local Area Networks (VLAN), Rapid Spanning Tree Protocol (RSTP), and Multiple Spanning Tree Protocol (MSTP) on the VOSS platforms. Support for the extended system ID affects how you manually configure the root device, the secondary root device, and the device priority of a VLAN. Overview and Topology. Multiple Spanning Tree Protocol (MSTP) is used on a bridge interface to ensure loop-free topology across multiple VLANs, MSTP can also provide Layer2 redundancy and can be used as a load balancing technique for VLANs since it has the ability to have different paths across different VLANs. Or Configure the native VLAN on the switch ports. Bridge ID Priority 32868 (priority 32768 sys-id-ext 100) Address 6412. The above Bridge ID assumes there is one Spanning Tree instance for the entire network. This is how standard was defined and is known as the Common Spanning-Tree approach (CST). : The priority for these VLANs is set using the set spantree port priority command. port 0/1 0/2 SW2) - Non-Designated Port (NDP) - It is a port that is in a blocking state in the STP Dec 1, 2024 · spanning-tree mst. Example: Device(config)# spanning-tree . Device# show spanning-tree mst: Verifies which interfaces are alternate or root ports. In the figure 1 configuration above, with two FastEthernet trunks linking Catalyst R and Catalyst D, the STP elects the same blocking port for all the VLANs configured. Switches running STP will build a map or topology of the entire switching network. 1w). vi. ip router ospf 1 area 0. Oct 23, 2010 · Only one switch in the layer 2 network becomes the root bridge. There are several topology considerations and limitations that must be addressed before you configure inter-VLAN bridging. There are five STP switchport states; these are: Disabled - The result of an administrative command that will disable the port. Cisco improved it for its switches. timers msec 250 5 The switch supports three spanning-tree modes: per-VLAN spanning tree plus (PVST+), Rapid PVST+, or Multiple Spanning Tree Protocol (MSTP). . spanning-tree vlan <vid> forward-time <secs> no spanning-tree vlan <vid> forward-time. Eachdevicesendsa configurationBPDUthroughallitsports. 1Q STP standard protocol per each Aug 13, 2020 · This will erase everything - so do this step first. 274f. Overview of MSTP. In Figure 1, there are two switches in “Distribution Layer” labelled MDF-1 and MDF-2. STP will identify if there are any loops, and then disable or block Feb 8, 2024 · PVST+ (Per VLAN Spanning Tree Protocol) The original IEEE 802. The root bridge Oct 30, 2016 · %SPANTREE-7-BLOCK_PORT_TYPE: Blocking GigabitEthernet0/0/0 on VLAN2. WhenyoumapVLANstoanMST The switch supports three spanning-tree modes: per-VLAN spanning tree plus (PVST+), Rapid PVST+, or Multiple Spanning Tree Protocol (MSTP). 1D. Jul 31, 2021 · The switch supports three spanning-tree modes: per-VLAN spanning tree plus (PVST+), Rapid PVST+, or Multiple Spanning Tree Protocol (MSTP). Example: Device(config)# spanning-tree Apr 1, 2016 · For example, if all devices in a network have the bridge priority for VLAN 100 set to the default value of 32768, entering the spanning-tree vlan 100 root primary command on a device sets the bridge priority for VLAN 100 to 8192, causing the device to become the root bridge for VLAN 100. G1:VLAN0100 Spanning tree enabled protocol rstp Root ID Priority 24676 Address 001f. Example: Configuring Loop Protection to Prevent Interfaces from Transitioning from Blocking to Forwarding in a Spanning Tree on EX Series Switches With ELS. configure terminal. secs. Aug 14, 2024 · show spanning-tree mst; Example: Device# show spanning-tree active. f400 Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Aging Time 300 Configuring spanning tree protocols. no spanning-tree vlan 2. Example: Step3 Device(config)#spanning-treemst configuration Step4 instance instance-id vlan vlan-range MapsVLANstoanMSTinstance. A network running 802. like in our example VLAN 10,20 and VLAN 30,40. 25a2. The Spanning Tree Protocol (STP) eliminates Layer 2 loops in networks, by selectively blocking some ports and allowing other ports to forward traffic. Procedure Spanning Tree Priority. 5700 This bridge is the root Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Bridge ID Priority 32769 (priority 32768 sys-id-ext 1) Address 0019. SW1#show spanning-tree vlan VLAN0001 Spanning tree enabled protocol ieee Root ID Priority 32769 Address 0019. Per-VLAN Rapid Spanning Tree (PVRST) or Rapid PVST or PVST+ is the IEEE 802. Jan 9, 2011 · be aware that if your switches are running per Vlan spanning-tree (PVST+ or Rapid PVST) a port can be in forwarding state for Vlan X and blocked for Vlan Y as the STP parameters can be tuned per Vlan and per port. Is this a problem? Like always…it depends. A spanning tree instance is a discrete spanning tree for a network. Inter-VLAN bridging is occasionally needed in order to bridge non-routable protocols or unsupported routed protocols between multiple VLANs. Procedure Spanning tree protocol overview. 1D spanning tree, with existing Cisco-proprietary Multiple Instance STP (MISTP), and with existing Cisco PVST+ and rapid per-VLAN spanning-tree plus (Rapid PVST+). It only calculates a single spanning tree for all VLANs. PVST uses the same concepts, terms, and logic the IEEE's STP uses. f33b. Dec 11, 2024 · The switch supports three spanning-tree modes: per-VLAN spanning tree plus (PVST+), Rapid PVST+, or Multiple Spanning Tree Protocol (MSTP). Aug 10, 2015 · Sometimes (may occur once a week or three times a day) I see STP starts blocking port: rtr#show spanning-tree VLAN1 is executing the ieee compatible Spanning Tree protocol Bridge Identifier has priority 32768, address 649e. Requirements. Jun 12, 2020 · On one 9508, the spanning tree shows the port (1/36) in that vlan in FWD state, but on the other 9508 spanning tree shows the port (1/36) in that vlan in BLK state; therefore it is preventing traffic from going across that link. This is also called Common Spanning-Tree (CST). 2. 10. Jun 21, 2020 · Inconsistent peer vlan. It is called DCE's STP. Aug 14, 2024 · The switch supports three spanning-tree modes: per-VLAN spanning tree plus (PVST+), Rapid PVST+, or Multiple Spanning Tree Protocol (MSTP). Configuration Spanning tree protocol overview. 1D standard with the creation of 802 Oct 18, 2023 · ISR4321#sh spanning-tree vlan 100. Oct 15, 2024 · A long ago, DCE developed the original version of STP (Spanning Tree Protocol). Shows ports blocked by STP protection functions such as Root guard, Loop guard, BPDU guard, and RPVST guard. The show spanning-tree active and show spanning-tree brief commands are used to see the spanning tree configuration and status, including which ports are currently blocking and which ports are forwarding for each VLAN on the switch. f400 This bridge is the root Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Bridge ID Priority 32778 (priority 32768 sys-id-ext 10) Address 0002. PVST is similar to STP but has some additional features. Since each spanning tree has a different active topology with different active links, this has the effect of dividing the data traffic among the available redundant links The Spanning-Tree Algorithm. 3e05. 1D has these characteristics: No load sharing is possible. Rapid Spanning-Tree; Rapid Spanning-Tree Configuration; Unit 4: Multiple Spanning-Tree. Blocking - port is blocked since it is causing loops but is receiving BPDUs. The default behavior of the spanning-tree instance vlan command changes so that, before a static VLAN is configured or a dynamic VLAN is learned on the switch, you can preconfigure its VLAN ID-to-MSTI mapping. Dec 11, 2024 · show spanning-tree mst; Example: Device# show spanning-tree active. Procedure Apr 28, 2011 · Current configuration:! interface FastEthernet5/8 no ip address switchport switchport access vlan 200 switchport mode access spanning-tree portfast end Switch# About BPDU Guard. While STP and RSTP allow only one spanning tree instance (instance 0), MSTP allows you to create multiple spanning tree instances, to manage redundant paths for specific VLANs on the network. This protocol is not part of the spanning tree toolkit, but it does help us to prevent loops. This document also provides instructions to use Command Line Interface (CLI) and Enterprise Device Manager (EDM). cccc. The CPU is spared. Router is routing fine between subnets. f180 Cost 19 Port 9 (GigabitEthernet0/0/1) Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec. Later, when the VLAN is created, it is automatically assigned to the MSTI to which it was previously mapped. Nov 3, 2021 · Hey all, I wanted to take a moment to look at spanning tree. or . It is desirable to have redundant links in a switched LAN so that a single link failure cannot interrupt normal operation of the network. We typed in spanning-tree vlan 1 root primary on Switch A forcing us to make ourselves the root bridge. 12 Helpful Reply. Cisco switches elect a single root switch per VLAN so, in theory each VLAN could have its own root bridge. 1D standard. MST (Multiple Spanning-Tree) MST and PVST+ Interoperability; Unit 5: Spanning-Tree Toolkit. Since each spanning tree has a different active topology with different active links, this has the effect of dividing the data traffic among the available redundant links Dec 6, 2019 · spanning-tree vlan vlan-id root secondary [diameter net-diameter [ hello-time seconds]] Example: Device(config)# spanning-tree vlan 20-24 root secondary diameter 4 hello-time 5: Configures a device to become the secondary root for the specified VLAN. If you are running STP for a VLAN-aware bridge in the default mode (RSTP) and you have a multiple spanning tree instance (MSTI 0, also known as a common spanning tree, or CST), you can set the tree priority for a bridge. May 20, 2022 · sh spanning tree vlan 622 sh spanning tree vlan 627 Sh spanning tree vlan 622 detail . Another version of spanning tree is able to calculate a topology for each VLAN . Sep 9, 2005 · Inter-VLAN bridging is the concept of simultaneously bridging multiple VLANs together. When you enable UplinkFast on the switch, UplinkFast processing is enabled and the spanning tree bridge priority for all VLANs is set to 49,152, making it unlikely that the switch will become the root switch. Step 3. hsrp 10 . Access gateway feature is not supported. Both use the same terminology and algorithm. Spanning Tree BPDU guard shuts down PortFast-configured interfaces that receive BPDUs, rather than putting them into the spanning tree blocking state. Since STP runs only one instance per switch, it does not include VLAN ID in BID. Actually, we use the command: show spanning-tree vlan 1 Aug 14, 2024 · The switch supports three spanning-tree modes: per-VLAN spanning tree plus (PVST+), Rapid PVST+, or Multiple Spanning Tree Protocol (MSTP). Spanning Tree page. Procedure The oldest version of spanning tree is called CST (Common Spanning Tree) and is defined in the 802. Jul 15, 2023 · The main parts that stand out to me are to check that you are using RSTP for the switch (it seems you must configure it for each Spanning Tree implementation separately) and that the port in question is a potential Alt path for Spanning Tree to start with, otherwise it might not ever qualify for loop prevention in the first place. If you want to enable a mode that is different from the default mode, this procedure is required. 9c00 This bridge is the root Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Bridge ID Priority 32891 (priority 32768 sys-id-ext 123) Address 0050. 1w (RSTP) standard implemented per VLAN. Spanning-Tree Port Roles - Root Port (RP) - It is a port on a non-root switch, which is the shortest (the best) path towards the root bridge. Procedure show spanning-tree mst; Example: Device# show spanning-tree active. spanning-tree vlan 27 priority 4096. The bridge with the lowest priority is the root bridge. 5700 Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Aging Time 300 For example, 4096, 8192, 12288, and so on. Spanning Tree Protocol (STP) Spanning Tree Protocol (STP) was developed to prevent the broadcast storms caused by switching loops. com Jan 25, 2015 · We have enabled vlans and are using vlan routing for our subnets but are getting STP blocking. Spanning tree protocols eliminate loops in a physical link-redundant network by selectively blocking redundant links and putting them in a standby state. When you have 20 VLANs, it means there are 20 instances of spanning tree. Procedure Nov 9, 2012 · spanning-tree vlan 1-26,28-1024 priority 0. cccc Cost 3 Port 4105 (port-channel10) Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec. RPVST+ is ideal in networks having fewer than 100 VLANs. Cisco changed that paradigm and introduced Per Vlan Spanning-Tree approach (PVST+). 569d. VLAN622: Nex4# VLAN0622 Spanning tree enabled protocol rstp Root ID Priority 4718 Address cccc. 3) As shown in Figure 3-8, every spanning-tree instance (STP instance) has a switch designated as the root bridge. 6000 Cost 20000 Port 136 (GigabitEthernet3/8) Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Bridge ID Priority 32771 Configures loop protection on a specific interface. Example: Device(config)# spanning-tree Nov 20, 2024 · It is called PVST (Per VLAN Spanning Tree). " You can confirm that Gi1/0/2 is the root port for VLAN20 and Gi1/0/3 is the blocking port for VLAN20 in this switch. Inconsistent port type. Nov 28, 2024 · Multiple Spanning Tree Protocol. Two switches are in the “Access layer” labelled IDF Syntax show spanning-tree inconsistent-ports [vlan <VLAN-ID>] Description. e. Dec 1, 2023 · For example, you can assign VLANs 1–100 to spanning tree instance 1, VLANs 101–200 to spanning tree instance 2, VLANs 201–300 to spanning tree instance 3, and so on. hsrp version 2. show spanning-tree mst. Nov 25, 2015 · For example, if all devices in a network have the bridge priority for VLAN 100 set to the default value of 32768, entering the spanning-tree vlan 100 root primary command on a device sets the bridge priority for VLAN 100 to 8192, causing the device to become the root bridge for VLAN 100. Procedure Oct 17, 2024 · Since other vendors could not use Cisco’s PVST protocol, they either devised their own versions of per-VLAN Spanning-Tree or simply stuck with one Common Spanning-Tree instance for all VLANs. 196 Mar 1, 2019 · show spanning-tree vlan <vlan_id> detail. Device(config-mst)#instance1vlan 10-20 •Forvlan vlan-range,therangeis1to 4094. Figure 1 MSTP Multiple Spanning Tree Protocol. Nov 26, 2024 · STP Port States. Aug 29, 2012 · Remove the trunk config from the interfaces on the switch and the subinterfaces from the router since there is only one VLAN and the trunks are not really needed when there is only 1 VLAN. Since each spanning tree has a different active topology with different active links, this has the effect of dividing the data traffic among the available redundant links The switch supports three spanning-tree modes: per-VLAN spanning tree plus (PVST+), Rapid PVST+, or Multiple Spanning Tree Protocol (MSTP). VLANs selected with the set spantree portvlanpri command belong to this group. I will go through some general configuration steps and a few best pr Unit 2: PVST (Per VLAN Spanning Tree) PVST (Per VLAN Spanning Tree) Spanning-Tree Root Bridge Configuration; Unit 3: Rapid Spanning-Tree. Therefore, you need to specify the VLAN as well. interface port-channel100. STP also uses the same process but with a slight difference in BID. 941: %SPANTREE-2-BLOCK_PVID_LOCAL: Blocking GigabitEthernet1/1/3 on VLAN0100. Ideally, we want to use a protocol with faster convergence such as rapid spanning tree (802. TheBPDUscommunicateandcomputethespanning Dec 11, 2024 · The switch supports three spanning-tree modes: per-VLAN spanning tree plus (PVST+), Rapid PVST+, or Multiple Spanning Tree Protocol (MSTP). switchport mode trunk. Before configuring a spanning tree: Determine the spanning tree protocol to be used: RPVST+ or MSTP. Example: •Forinstance-id,therangeis0to4094. Example: Device(config)# spanning-tree 6K-2-S2#sh spanning-tree vlan 123 ac VLAN0123 Spanning tree enabled protocol rstp Root ID Priority 32891 Address 0050. Step 2. Apr 5, 2024 · show spanning-tree mst; Example: Device# show spanning-tree active. The Spanning Tree page displays the spanning tree configuration details of the switch. As networks begun to grow and become more complex, VLANs were introduced, allowing the creation of multiple logical and physical networks. It is called PVST (Per VLAN Spanning Tree). buzzhani1 Jul 31, 2024 · show spanning-tree mst; Example: Device# show spanning-tree active. Parameter range: 4-30 seconds. I have set up a test environment and replicating the same issue. Configures how fast an interface changes its spanning tree state from Blocking to Forwarding. By default, Cisco Catalyst Switches run PVST+ or Rapid PVST+ (Per VLAN Spanning Tree). 2/24. do stack standalone do stack standalone reboot # Answer yes to the three confirmation prompts that are displayed # Disable Auto Config / Updates via DHCP no boot host auto-config no boot host auto-update # Disable SmartPort macro auto disabled voice vlan state disabled # Configure CDP (Global Device# show spanning-tree vlan VLAN200 Spanning tree enabled protocol rstp Root ID Priority 32778 Address 0002. For example, you can assign VLANs 1–100 to spanning tree instance 1, VLANs 101–200 to spanning tree instance 2, VLANs 201–300 to spanning tree instance 3, and so on. The following is an output example of "show spanning-tree vlan <vlan_id>. Procedure Aug 28, 2024 · To determine which port is considered the root for a given VLAN, issue theshow spanning-tree vlan command: cat#show spanning-tree vlan 333 MST03 Spanning tree enabled protocol mstp Root ID Priority 32771 Address 0050. Dec 1, 2017 · In this scenario, the F0/2 port on S2 transitioned to a designated port, and the F0/2 port on S3 transitioned to an alternate port and is therefore blocking traffic. Per-VLAN Rapid Spanning Tree. Syntax Description. 196. MSTP enables formation of MST regions that can run multiple MST instances (MSTI). When both links are up, the spanning−tree algorithm (STA) disables one of them in order to avoid a bridging loop between the two switches. Device# show spanning-tree vlan VLAN200 Spanning tree enabled protocol rstp Root ID Priority 32778 Address 0002. This means that each VLAN is mapped to a single spanning tree instance. By default, ICX switches run 802. So let’s look at the top output here, first of Switch A. MSTP configures a separate Spanning Tree for each VLAN group and blocks all but one of the possible alternate paths within each spanning tree. 000928: Jun 17 09:15:07. Topology. 195. spanning-tree loopguard default. 1. f4d2 For example, you can assign VLANs 1–100 to spanning tree instance 1, VLANs 101–200 to spanning tree instance 2, VLANs 201–300 to spanning tree instance 3, and so on. spanning-tree guard root. f400 Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Aging Time 300 Mar 2, 2021 · For example, if all devices in a network have the bridge priority for VLAN 100 set to the default value of 32768, entering the spanning-tree vlan 100 root primary command on a device sets the bridge priority for VLAN 100 to 8192, causing the device to become the root bridge for VLAN 100. The default spanning tree version on a Cisco switch is PVST+ which runs a separate spanning tree instance for every VLAN. If you look down below at the output after that for show spanning-tree vlan 1, we can see we are now the root bridge. The Multiple Spanning Tree Protocol (MSTP) is an STP variant that allows multiple and independent spanning trees to be created over the same physical network. Example: Device# configure terminal: Enters global configuration mode. The spanning-tree algorithm follows these steps: Elect one root bridge per broadcast domain; Elect one root port per nonroot bridge; Elect one designated port per segment; The ports transition to the forwarding or blocking state; How do we elect this root bridge? For example, if all devices in a network have the bridge priority for VLAN 100 set to the default value of 32768, entering the spanning-tree vlan 100 root primary command on a device sets the bridge priority for VLAN 100 to 8192, causing the device to become the root bridge for VLAN 100. One uplink must block for all VLANs. Examples and network illustrations in this document may illustrate only one of the supported Dec 1, 2023 · spanning-tree mst. The recent versions of STP include the Rapid Spanning Tree Protocol (RSTP), the Per-VLAN Spanning Tree (PVST), and the Multiple Spanning Tree Protocol (MSTP). By default, the device runs the Rapid PVST+ protocol. port 0/4 0/3 in SW3) - Designated Port (DP) - It is a port that is in the forwarding state. It explicitly says Spanning tree protocol overview. Procedure Dec 8, 2023 · Both MSTP and RSTP improve the spanning-tree operation and maintain backward compatibility with equipment that is based on the (original) IEEE 802. Jul 31, 2024 · Device# show spanning-tree vlan VLAN200 Spanning tree enabled protocol rstp Root ID Priority 32778 Address 0002. The switch supports three spanning-tree modes: per-VLAN spanning tree plus (PVST+), Rapid PVST+, or Multiple Spanning Tree Protocol (MSTP). Having set up multiple spanning tree instances, the set of VLANs in use can be partitioned among them; for example, VLANs 1 - 100 can be assigned to spanning tree instance 1, VLANs 101 - 200 can be assigned to spanning tree instance 2, VLANs 201 - 300 can be assigned to spanning tree instance 3, and so on. ; Blocking - When a device is connected, the port will first enter the blocking state. The no form of the command resets the parameter value to its default. In the example here, we're running the command first off on the root bridge, which was on Acc3 for our example. 1d spanning tree on a per-vlan basis. In addition, the spanning tree port cost and port-VLAN cost of all ports on the switch is increased by 3000. that is the reason spanning-tree The default spanning tree configuration includes a single spanning tree instance, named 0. This tutorial explains the root bridge election process for PVST. See full list on cisco. 15 seconds. Per VLAN Spanning Tree (PVST) is a protocol running a separate instance of the 802. This document covers these considerations and Sep 24, 2024 · Monitoring Spanning Tree Protocols on Switches | 229 Checking the Status of Spanning-Tree Instance Interfaces | 232. The root bridge Priority is 28673 for VLAN 1. Eventually, recognizing the benefits and drawbacks of Cisco’s PVST protocol, the IEEE decided to update the 802. description vpc peerlink to Nexus B. SW3(config-if)#spanning-tree guard loop The other protocol we can use to deal with unidirectional link failures is called UDLD (UniDirectional Link Detection). Dec 8, 2023 · show spanning-tree mst; Example: Device# show spanning-tree active. 172c. f400 Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Aging Time 300 Oct 12, 2022 · 4. 14bb. spanning-tree port type network. Default. STP was originally defined in IEEE 802. (i. ip address 10. Spanning Tree Algorithm: Root Bridge (3. Blocking: No data is forwarded, Per VLAN Spanning Tree (PVST) May 23, 2024 · The global MSTP configures a separate Spanning Tree for each VLAN group and blocks all but one of the possible alternate paths within each spanning tree instance. After configuring the switch as the root switch, we recommend that you avoid manually configuring the hello time, forward-delay time, and maximum-age time through the spanning-tree vlan vlan-id hello-time , spanning-tree vlan vlan-id forward-time , and the spanning-tree vlan vlan-id max-age global configuration commands. Procedure The switch supports three spanning-tree modes: per-VLAN spanning tree plus (PVST+), Rapid PVST+, or Multiple Spanning Tree Protocol (MSTP). In networks having 100 or more VLANs, MSTP is the recommended spanning tree choice due to the increased load on the switch CPU. Later, IEEE developed an open-sourced version of STP. Example: Device(config)# spanning-tree Aug 30, 2005 · "global" group "custom" group; By default, all VLANs belong to this group. Procedure Whenthedevicesinanetworkarepoweredup,eachfunctionsastherootdevice. Spanning Tree Protocol. A single instance of STP runs on each configured VLAN (if you do not manually disable STP). 9c00 Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Aging Spanning tree protocol overview. 7dfa Configured hello time 2, max age 20, forward delay 15 We are the root of the spanning tree Topology change flag Jul 31, 2024 · The switch supports three spanning-tree modes: per-VLAN spanning tree plus (PVST+), Rapid PVST+, or Multiple Spanning Tree Protocol (MSTP). Procedure Aug 21, 2024 · The global MSTP configures a separate Spanning Tree for each VLAN group and blocks all but one of the possible alternate paths within each spanning tree instance. Example: Device(config)# spanning-tree Dec 1, 2023 · Per vlan Spanning Tree(PVST/PVST+/PVRST) is not supported on Cisco NCS 5000 Series Routers. Go to solution. isbho voulgkto jgdxw zvoejy qpb fmnru lypc ewqdjlo xhcd yqktn