Chapter 9 configuring spanning tree portfast, uplinkfast, backbonefast, and loop guard understanding how portfast works understanding how portfast works spanning tree portfast causes a switch or trunk port to enter the spanning tree forwarding state immediately, bypassing the. In a valid configuration, portfast layer 2 lan interfaces edge ports do not. Similar to this is gigabitethernet014 on switch201 for another hyper v host. It is recommended to keep the total switch port count in a network to fewer than 8000 ports for reliable loading of the switch port page. The problem i have is that the core switch periodically logs a mac flap event between the links to sw1 and sw2. With bpdu frames, which switch will be root bridge or which interface will be blocking mode is realized. How to configure portfast on different kinds of switches. On portfast enabled ports, bpdu guard provides the protection against layer 2 loops that stp cannot provide when stp portfast is enabled. During the listening state, the switch tries to determine where the port fits in the spanning tree topology. Bpdu guard feature must be enabled on a port that should never receive a bpdu from its connected device.
In general you really shouldnt use bpdu filtering at all unless you have an operational reason to do so. It is highly recommended to never put a trunk port in spanningtree portfast to prevent broadcast storms and cisco switches will not put a trunk port in portfast mode anyway so this line is useless in this case. Hyper v has proven to be a very cost effective solution for server consolidation. This factor of time is not an issue for many people, but it can cause problems for some. By using a different vlan tag for each customer we can separate the. Portfast allows a switch port running spanning tree protocol stp to go directly from blocking to forwarding mode by skipping the learning and listening modes. The upstream switch ports must be configured in spanningtree port type edge trunk mode. The time spanning tree protocol stp takes to transition ports over to the forwarding state can cause problems.
Spanning tree and bpduguardfilter will it affect my trunk. Use with caution % portfast will be configured in 2 interfaces due to the range command but will only have effect when the interfaces are in a nontrunking mode. Alternately, you can specify the management vlan under configure. Sep 22, 2011 interface when portfast is enabled, can cause temporary bridging loops. If you do spanningtree portfast it will only take effect on access ports, meaning that if you do it on a trunk port and then do a sh spann int xxx portfast, you will see that portfast is disabled.
The port type determines the behavior of the port with respect to stp extensions. While testing i had an issue with the vm additions and network connectivity was not working. There are case where you would enable portfast on trunks, this is the command spanningtree portfast trunk. Cisco to hp procurve switch config hewlett packard. How to troubleshoot a mac flapping between switch ports. The spanning tree protocol is a protocol designed to ensure switch loops do not occur. Juniper switches use the rstp costs and therefore this may lead to different spanning tree calculations and loop problems. Solved port fast, bpdu and hyperv networking spiceworks. On the switches monitor switch ports page, administrators can name ports, turn ports onoff, enable spanning tree rstp, define port types access trunk, and specify vlans data and voice. To add portfast to a trunk you need to add the trunk keyword. In our previous articles, we provided information about network redundancy. Rapid stp is an enhanced version of spanning tree that is faster. These hyperv hosts are trunked to switches, because vms running on these hosts.
Port fast, bpdu and hyperv solutions experts exchange. Or better yet, make any link to a switch a l3 link and not have to worry about spanningtree. I wonder if stp runs on a trunk and if so why would they disable it with portfast or type edge nexus. Configuring spanning tree portfast, bpdu guard, bpdu. In that case vswitch1 on esxi side should be configured like this. Vmware vsphere physical network design considerations. When stp spanning tree protocol is enabled on network switch ports to which network. Dell networking n4000 series configuration manual pdf download. Evidence of this is also the fact that companies are beginning to move from vmware to the hyper v virtualization platform. Virtual test lab with vmware, cisco and microsoft popravak.
This is used for ports that only hosts pcs will connect to. This factor of time is not an issue for many people, but it can cause problems for. If you prefer to place ports in a nondefault vlan, refer to the documentation for your switch. Configure switch settings is where you can configure global switch settings such as the management vlan, spanning tree for the switch stack, quality of service, and port mirroring. Best practise cisco vlan config with intel nic and hyper v hi, im trying to set up an microsoft hyper v 2. In the previous lab if you read andor completed it you learned about ciscos proprietary per vlan spanning tree protocol which enables a spanningtree. You may want to run show process cpu and see how much cpu utilization is going on. This will shut down the interface if bpdus are seen coming from a port you put this on.
I configured this switch as an access port in vlan 200, i made sure vlan 200 had an ip address an svi address on the switch. If a switch port which is configured with spanning tree protocol stp portfast feature, it must be connected to an end device for exampe. How to enable spanning tree portfast in cisco catalyst. This article will cover the windows 2012 hyper v best practices, and aims to help you run your hyper v virtualization environment as optimum as possible. Best practice is not to normally allow portfast between switch links such as trunk ports.
What is bpdu guard and how to configure bpdu guard in. The current switch has a very simple config and has uplinks to an asa ha pair, and connections to 3 hyperv hosts which are tagging a single vlan 70. Just noticed that during vmotion the servers are not reachable from the network. Hyperv network virtualization also decouples physical network from virtual network. As a rule i enable stpf on all my ports that are switchport mode access. For deep dives into why its safe to connect virtual switches to physical switches with portfast enabled, see ivans blog at blog. Enable rstp portfast and flow control on my hp pro. Once youve used the switchport host command your can then run whatever additional commands are needed such as spanningtree bpduguard enable or spanningtree bpduguard enable. Understanding vlan, trunk, nic teaming, virtual switch. Nxios spanningtree port type edge for an access port s panning tree port type edge trunk for a trunk port to set stp to portfast on a dell switch, run the command.
Ensuring the switchport is configured as portfast allows the port to come up as quickly as possible and begin forwarding traffic. In this lesson well take a good look at how bpdufilter works. By default, the switch will try to contact meraki dashboard on the untagged native vlan. In other words to miniimise the time stp takes to converge. Portfast should only be enabled on ports connected to a single host. This should enabled spanning tree portfast in a cisco catalyst switch running cisco ios. In this post, well discuss common general switch issues, vlan related issues, and spanningtree issues. Enable portfast on all interfaces of the switch by default and do not use the spanningtree portfast command in interface configuration mode. Configuring rapid pervlan spanning tree protocol free. They just decided to reuse that command instead of creating a new one called spanningtree edge or such. The most important configuration items that are iscsi related include. If youre new here, you may want to subscribe to my rss feed. The spanningtree bpdufilter works similar to bpduguard as it allows you to block malicious bpdus. Here you can carry out diagnostics, set the baud rate of the switch and also download new software to the switch via you terminal application.
The hardware support vendor who dropped off the onsite spare replacement of the 48 port rj45 blade asked about spanningtree being enabled on the switches. Finally, you may wonder about spanningtree as i have done. Configuring switchport spanning tree portfast free ccna. A number of enhancements have been introduced into the spanning tree protocol to make it flexible for todays increasingly complex and demanding networks. Busting myths spanning tree portfast on the interface. Enable hyper v and multipath feature on windows server 2012 r2. I usually configure a trunk to my vmware or hyperv servers. Hyperv best practices replica, cluster, backup advice. Feb 23, 2011 finally, you may wonder about spanningtree as i have done. Microsoft windows server 2012 r2 hyperv on dell poweredge. If you dont use portfast on host ports what normally happens is the host will see link up and start sending frames and time out on certain requests before the port moves to forwarding state. The preceding procedure places all switch ports in the default vlan. Lets talk about the essential part of troubleshooting vlan and switch problems.
To better understand portfast s logic, you can watch the video below and also subscribe to our youtube channel to support us. No filter 200 series 6910 ethernet access switch air defense adsp automation suites bigiron rx boss branch routers eos 800 series modular n,s,k,7k securestack ers 2000 series ers 3000 series ers 4000 series ers 5000 series ers 8000 series extremecloud extremecloud iq extremecloud appliance. It is highly recommended to never put a trunk port in spanningtree portfast to. This article explains how to configure an lacp bonded interface with cisco switches. In the virtualization management console i configured and installed a new windows server 2003 virtual machine. The switchport host command is a macro on all cisco switches. Port profiles can be used as a source and destination for span and erspan. When to use spanningtree portfast trunk solutions experts. With bpduguard enabled on top of portfast the receipt of a bpdu packet over a portfast interface triggers the port to move into an errdisabled state instead of configuring the port in an stp blocking port configuration which. Portfast port vs edge port the it networking community. This requires a trunk between the server and switch. May 06, 2007 when you enable portfast on a switch or trunk port, the port is immediately transitioned to the spanning tree forwarding state. If interface g101 was configured as a trunk port and received a bpdu packet, it would not be disabled. When binding a teaming adapter to a virtual switch in a hyperv environment and virtual machine.
Ensure switchports are configured for spanning tree portfast. Windows 2012 server hyperv nic teaming with cisco catalyst switch. Ive removed the spanning tree portfast command assuming that the port would look for loops before going into forwarding mode. I have dell powerconnect switches, which dont suppport disabling bpduguard at the port level can only do globally. What you need to do is enable spanningtree portfast. An edge port, which is connected to a layer 2 host, can be either. Without spanningtree portfast on upstream switch ports, it takes.
As stated, there are no grandchild switches from the 4507, so there are no switchto. Nov 15, 2011 spanning tree portfast end but when i had to force the server to shutdown recently it created a loop and interrupted traffic on the 150 vlan. We only do qos over the wan and let the routers take care of it. Routing and switching practice tests ch02 flashcards quizlet. Best practices for hyper v vary considerably depending on whether youre using clustered servers. I use spanningtree portfast for my hyper v ports, including network teams. Even for win 64 bit, you need to download and install e manually. However i saw examples where they use it on a trunk port. Usually spanningtree portfast is used on access port to which a computer is connected, in order to avoid the 50 seconds of stp. There are two features you can configure to complement the functionality of portfast. Just want to confirm, all these ports should be access ports not trunk portfast active and bpdu guard switched on.
How to configure dhcp server on cisco routers and switches with cisco ios. The above global configuration will recover an errdisabled port, due to bpduguard, automatically every 30 seconds conclusion. Hp switches use a feature called adminedgeport, which works the same way as portfast or rstp. D spanning tree portfast is configured and defaulting to vlan 1. May 10, 2020 as expected, the port was automatically disabled by the spanning tree protocol. Configuring an lacp bonded interface with cisco switches. Hi, im new to hp networking and need to replace an old unsupported cisco switch for a hp procurve.
For more troubleshooting guides, or articles on hyperv, please visit our kb home. Do you have spanning tree disabled for the ports, or are you using portfast and bpduguard disable on these ports instead. As soon as we trunk the ports on the switches, the host stops responding although the guests still ping. This is because i may have different vms on different vlans. Spanning tree seems to be functioning as expected and the interface on sw3 that connects to sw4 is put into a blocking state. You should never use portfast or bpdu guardfilter on interswitch trunk ports. Teaming of virtual nics on the host os is not supported in the hyperv environment. Stp may cause temporary loss of network connectivity when a. After committing our changes, we again try to download the eicar test file and.
Jun 20, 20 use bpduguard on portfast ports conf t int faxx spanningtree bpduguard. When you enable portfast on a switch or trunk port, the port is immediately transitioned to the spanning tree forwarding state. Understanding how portfast bpdu guard works to prevent loops from occurring in a network, the portfast mode is supported only on nontrunking access ports because these ports typically do not transmit or receive bpdus. The linux bridge supports only stp, no rstp rapid spanning tree. To configure bpdu guard in global mode use the spanningtree portfast bpduguard. Now you can see above, ive presented one physical nic to this vswitch vmnic1. Yes, portfast and bpdu guard should be enabled on any port where there is an endhost connected to it. Spanning tree bpduguard and errdisable interface automatic. If stp is on you may try to send traffic before stp unlocks the port, which is bad. So if you have a 32 bit windows server, then you need to first modify the. The way to define an edge port on cisco devices is to use spanningtree portfast. Jun 18, 20 spanningtree portfast this disables spanning tree on a port so it can not become a trunkstp port. Bpdu guard feature is used to protect the layer 2 spanning tree protocol stp topology from bpdu related attacks.
By default, the port spends approximately 15 seconds listening and 15 seconds learning. Only on end devices where there is no danger of spanningtree loops being created should portfast be enabled. Cisco nexusv for microsoft hyperv release notes, release. It is possible to have nontrunking ports that connect two switches, however, which can then cause spanning tree loops. There are case where you would enable portfast on trunks, this is the command spanning tree portfast trunk. I want to set up portfast spanningtree on an ex4200.
Configure spanning tree portfast on edge ports note. This only works with the e intel driver which only ships with 64 bit windows. So, it can be harmful to configure this feature on trunk interfaces where we have. The switchport is configured as a trunk, but since the computer was originally in vlan 1 and the native vlan of the interface is vlan 1 by default, all traffic untagged was directed to the native vlan. It does this by bypassing the listening and learning states of stp. This should be used with portfast on ports that switches should not be plugged into. Solved windows server bridged nics and spanningtree on. The difference is that bpduguard will put the interface that it receives the bpdu on in errdisable mode while bpdufilter just filters it. I know how to do it with cisco, but it seems less simple on ex4200. If you want to enable portfast on more than one port, follow the command below. As a general ruleofthumb the best thing you can do is try to configure your host server and your virtual machines in a way that avoids resource contention to the greatest extent possible. Alternately, you can specify the management vlan under. I said most ints dont have it, but after checking 17, all the ints have spanningtree portfast enabled.
To enable portfast on a trunk port you need the trunk keyword spanningtree portfast trunk hth. We have talked about using stp protocol to prevent loops in a network redundancy when you add a new switch to an existing network, spanning tree protocol will pass through 4 states. See setting up nic teaming on windows server 2012 r2. Usually spanning tree portfast is used on access port to which a computer is connected, in order to avoid the 50 seconds of stp. Stp dictates that the port starts out blocking, and then immediately moves through the listening and learning phases.
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