It does not honor port configuration but the global configuration. The trunk port should send untagged frames on vlan 10 and when they end up on switch1 they should be put in vlan 10. Cisco nexus vpc configuration and spanningtree elimination. On an access port, both spanningtree portfast and spanningtree portfast trunk cause the port to act as a portfastenabled i.
Spanning tree design guidelines for cisco nxos software and. It also provides information on how to obtain related documentation. One of my customers wanted to set his root bridge and secondary bridge for his vlans to be his n7ks. Spanning tree design guidelines for cisco nxos software and virtual portchannels. Cisco nexus 2000 series fabric extenders fex behave and can be considered as remote line cards for cisco nexus switches. Also note the interface command spanningtree port type network.
Which two statements about configuring vlans on the cisco nexus 7000 platform are true. Spanningtree bpduguard enabled globally and disabled on the port. Net50bur deploying nsx on a cisco infrastructure or. However, spanning tree is still a necessary component of the design, often seemingly more complex, due to various options available, and. Cisco nexus 6000 series nxos layer 2 switching configuration guide, release 7. Nexus it workbooks everything center share knowledge. I have configured po41 on both nexus which is connecting with 3750 switch. Cisco nexus 7000 connectivity solutions for cisco ucs.
Best practices for root bridge on nxos netcraftsmen. Cisco nexus 7000 series nxos layer 2 switching configuration guide. Switch a is connected to c and d with trunk ports forming port channel and l3 interface is configured on same port channel. The software supports the following cisco proprietary features.
This is extremely important to use on interfaces connecting to other nexus switches. When connecting to an ip storage controller use the interface command spanningtree port type edge trunk. If the switchports are connecting to vmware hosts, id be using spanningtree port type edge trunk. Once the interface receives bpdus again, the interface is unblocked and goes through the normal spanningtree port states again. Spanning tree design guidelines for cisco nxos software. On a nexus 5000 we have a connection vpc to a catalyst 3750. The second customer also had the same design issue, but did not know about it until i pointed it out to him. These ports should not receive bridge protocol data units bpdus, otherwise they will immediately transition to the blocking state. The other reason you need to set the edgeport status is so that when a port comes online it. My question is, should i give command spanningtree port type network in po configuration on nexus.
This mean that processes such as ospf, eigrp, hsrp, lacp can be started and stopped and upgraded without affecting the kernel. Deploying nsx on a cisco infrastructure vmworld 2017 content. Cisco nexus 7000 series nxos layer 2 switching command. Usually spanningtree portfast is used on access port to which a computer is connected, in order to avoid the 50 seconds of stp.
The first customer thought he had a stp issue between his n7ks and his n5ks, but he actually had vpc design issue. Nexus 7000 and 5000 series have taken portchannel functionality to. Problem the topology is arranged in a star, a links terminate at a pair of cisco 4503e switches, problem occurred that some switches could not reach the cisco 4503e switches after the 4503 switches became primary and secondary root. The same type of cisco nexus switches must be used for vpc pairing. Hottest cisconexus answers network engineering stack. Spanning tree blocks a switch uplink look, i understand you need as much as possible to help me out but im reluctant to post the show run from a production core switch. Layer 2 support and configurations overview of damn small linux. It is not possible to configure vpc on a pair of switches consisting of a nexus 7000 series and a nexus 5000 series switch. It also provides a path to perform inline software service upgrades issu.
When configuring a trunk port on a nexus switch, what two options must be configured before the. The trunk keyword enables edge behavior on a trunk port. Solution desg bkn4 the port is blocked although it should be forwarding. What are two core features of cisco nexus operating system.
Spanningtree edge ports hewlett packard enterprise. Dhcp not working on clients connected to nexus 3048 but works on svi. When connecting l2 links between nexus devices, my understanding is the recommendation is to use spanningtree port type network, correct. Sometimes there is a requirement to transition the trunk port, e. Integration of the nexus 7000 aggregation layer with cisco catalyst 6500 and 4948 switches running cisco ios was accomplished by leaving the connecting ports set as their default spanning tree port type of normal, effectively not enabling bridge assurance on the ports. I have been thinking about best practices for configuring nexus 7000 switches, and most recently about layer 2 best practices. Cisco nexus vpc spanningtree port type trunk question network. We only have single homed fex with 7k to 5k vpc ports left as normal spanning tree ports. Understanding cisco nexus 2000 series fabric extenders.
There are exceptions to this rule, but they require solid knowledge and understanding by the network admin. Why is the nexus cpu running high solutions experts. However i saw examples where they use it on a trunk port. Configuring cisco ports with hp flex10 to avoid loops. As far as why this affects issu, when you run a port as spanning tree type network it. I wonder if stp runs on a trunk and if so why would they disable it with portfast or type edge nexus. Nexus vpc reduces the reliance on spanning tree in a data center design, and improves link utilization and load sharing. These two commands differ if the port is operating as a trunk port either by static configuration or via dtp negotiation.
It is beyond the scope of this document to describe the spanningtree algorithms in detail. Best practices for issu inservice software upgrade with vpc. Such a port will immediately become forwarding after coming up. To return the port to a normal spanning tree port, use the no spanningtree port type command or the spanningtree port type normal command. Net50be deploying nsx on a cisco infrastructure or. If we set it to network it fails when trying to issue the command show spanningtree issuimpact it succeeds if we tell the switch its an edge trunk but i believe that will break spanning tree and leave us vulnerable. See the cisco nexus 7000 series nxos interfaces configuration guide, for information on. Best practices for virtual port channels vpc on cisco nexus 7000. Bridge assurance is feature which is used to detect and prevent the loop after detecting unidirectional link behavior due to software failure or control plane issue and not due. It seems as if folks think that simply because vsphere software is installed that their virtual infrastructure will automagically do all the great things that its designed to do. Lacp is not supported in vmware standard switch,just configure as normal trunk port and configure route based on virtual port id.
The nexus 7000 may be participating in a larger fabricpath network upstream, but this fact is completely transparent to cisco ucs or any other device attached to a normal classic ethernet port. With virtual portchannels vpcs, you should configure the spanning tree root and secondary roots for the. Cisco nexus 7000 series nxos layer 2 switching command reference, release 5. Setting porttype to edge enables port fast which allows access port to enter the forwarding state immediately, instead of waiting for stp to converge. Otoh, cisco often says that nexus switches shouldnt be used upstream of other switches. An edge port, which is connected to a layer 2 host, can be either an access port or a trunk port. Hi guys, i need spanning tree port type details networkedgenormal. In the last week i talked to two different customers about issues with their portchannels, vpcs, and spanningtree protocol. By first principle, portfast trunk or port type edge trunk should not be enabled on ports that connect to switches, lest you risk. Fundamental spanningtree concepts the first important choice to make in the design of a data center network is the spanningtree choice. By first principle, portfast trunk or port type edge trunk should not be enabled on ports that connect to switches, lest you risk loops if that other switch connects to some other upstream switch. Cisco nexus 7000 series nxos layer 2 switching configuration. Virtual port channel vpc ties two identical nexus 9k, 7k, 6k, 5k, or 3k switches together by.
Nexus 5k and issu and spanning tree is this really what they. Cisco nexus 5000 series nxos software configuration guide. I put bpdufilter on the port channel of the downstream switch connected to the fex. If i configure spanningtree port type edge trunk on physical interface instead of port channel does that work or i have to do spanningtree port type edge trunk on port channel example. Spanning tree port typesthe default spanning tree port type is normal. Spanningtree port type edgeenables edge behavior on the access port. Below is however the log on the core switch a few minutes after ive connected the switch, doesnt matter if its a cisco switch or an hp. Hi, does anyone know how to apply for the contractsubscription to download images from ciscos software download centre. C and d interfaces facing a and b l3 device facing are port type edge trunk and. We have about 150 edge switches mostly 48 ports, most of them in a stack of 23 devices and our own fiber to the core. Spanningtree inconsistent ports it tips for systems and. Im just including a sample configuration of most of the options. The nexus platform provides several advantages that include the fact that it was built to be more modular than the catalyst platform.
Portchannels, vpcs, and spanning tree issues netcraftsmen. Following design are not supported with fex and vpc on nexus 7000 nxos 6. When configuring a trunk port on a nexus switch, what two options must be configured before the port will participate in a 802. Uses bridge assurance spanningtree port type network default makes spanningtree type network default for. Configure these ports as spanningtree port type edge or edge trunk to force the ports to transition to forwarding state quickly. Spanning tree and bpduguardfilter will it affect my trunk. Spanningtree port type edge trunkenables edge behavior on the trunk port. This command is used when connecting to end hosts that carry multiple vlans. Spanning tree extensions im not going to list all the commads with descriptions. I was wondering anyone may know of a data wiping software that works on routers switches. Moreover, i could see this being an issue if one end had a spanningtree type of edge configured with portfast since we truly shouldnt be seeing spanningtree bpdus on an access port, but in this case, the port types are. Recommended spanning tree protocol configuration with vpc. The port type determines the behavior of the port with respect to stp extensions. You can configure a spanning tree port as an edge port, a network port, or a normal.
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