If a switch misses three bpdus from a neighbor switch it will assume connectivity to this switch has been. Spanning tree issue between catalyst 4948 and juniper qfx5100. Udld enables devices to detect when a unidirectional link exists and also to shut down the affected interface. Edc0 this bridge is the root hello time 2 sec max age 20 sec forward delay 15 sec bridge id priority 32769 priority 32768 sysidext 1 address 0001. Stp configuration between cisco and hp hewlett packard. Hi everyone, im wanting to integrate an ex4200 into my cisco network. Cisco and juniper switch interoperability networking. This command will enable rapid spanning tree on a juniper ex series switch. Understanding bpdus used for exchanging information among. Juniper however also supports vstp vlan spanning tree to allow mixed vendor compatibility between juniper and cisco networks however in a pure.
I have a cisco 2911, and a cisco 3650x that i would like to configure link aggregation between. I will have a full mesh vc between all my juniper switches along with proper vlans for. In a layer 2 bridge environment, spanningtree protocols use data frames called bridge protocol data units bpdus to exchange information among bridges. Junos os understanding bpdus used for exchanging information among. Any third party switches that implement stp based on the ieee standard, have a spanning tree implementation that has a single instance span the entire switch, regardless of the number of vlans. Though to prevent those blocks could you not create lagsetherchannels. Spanning tree stprstp interoperability of ex switches. Spanning tree also allows a network design to include backup links providing fault tolerance if an active link fails as the name suggests, stp creates a spanning tree that. At the time of this writing, the choice is between these two algorithms. All spanningtree calculation related changes are applied to instances.
The rstp is an improvement on the spanning tree protocol, and it is a standard spanning tree as an ieee standard while the pvst is a spanning tree protocol as a cisco proprietary. The main purpose of stp is to ensure that you do not create loops when you have redundant paths in your network. For the love of physics walter lewin may 16, 2011 duration. Spanning tree also allows a network design to include spare redundant links to provide automatic backup paths if an active link fails. Stp configuration between cisco and hp there is this command available on the hp switches spanning tree priority xx forceversion rstpoperation or stpcompatible, the value xx can be upto 15 which equals a priority of 61440 15 x 4096. The difference between spanning tree and leafspine. It is beyond the scope of this document to describe the spanningtree algorithms in detail. The data center comprises of a pair of juniper qfx5100 root bridge for the spanning tree, ill refer to this as crs, another pair of qfx5100 uplinked to the root bridge ill refer to this as csw and 84948 hanging off the juniper qfxill refer to this as asw. On the cisco side, the show spanning tree command is showing port 47 as the bridge port and vice versa on the ex switch. Mstp configuration is quite different from legacy pvstrapidpvst in such that mstp has its own configuration mode. However, i have not configured lacp between a switch and a router. Understanding and configuring spanning tree protocol stp. Normally, a port id is denoted in hexadecimals similar as 0x8015, which is equivalant to 128.
I currently have a conondrum between a cisco router and cisco switch. Juniper networks ex series switches interact with the various types of bpdus the cisco switches send out. The spanning tree protocol stp is a network protocol that builds a loopfree logical topology for ethernet networks. This is accomplished by configuring one switch to be elected the root bridge for half of the vlans in the network and a second switch to be elected the root. Juniper cisco interoperability cookbook network test.
Fundamental spanningtree concepts the first important choice to make in the design of a data center network is the spanningtree choice. The basic function of stp is to prevent bridge loops and ensuing broadcast radiation. Udld is useful on a fiber ports to prevent network issues resulting in miswiring at the patch panel causing the link to be in upup status but the bpdus are lost. Juniper ex switches with vstp and cisco nxos rapidpvst.
The situation is this you have a large network of switches, using spanningtree to prevent loops, but you are also using the network for multicast streaming. Issue with stp over lacp trunk and juniper ex previous next. Cisco and force10 stp spanning tree interoperability. Unidirectional links can cause spanningtree topology loops. Spanning tree path cost value can be defined as the accumulated port costs from a switch other than the root bridge switch to reach the root switch. Again, i just want to reiterate, the network is not going to stay this way. I will have a full mesh vc between all my juniper switches along with proper vlans for network segregation. This article discusses and demonstrates the configuration and verification of 802. Configure etherchannel lacp between cisco router and. Rapid for being a fast version of spanningtree protocol and it was labeled as 802. The difference between spanning tree and leafspine networking when considering the private cloud, traditionally, companys private datacenters have implemented 3tier layer 2 networks based on the spanning tree protocol stp, which doesnt lend itself well. Difference between rstp and pvst difference between.
My reply to shivlu was to educate the nonnetwork staff on the risk of a l2 spanning tree loop. Learn how to configure juniper switches to play nicely with cisco switches when. Bring in your network equipment cisco, juniper, etc ses, who should have examples of other businesses who had damaging outages due to spanning tree loops between data centers. Multicast, igmp and spanningtree so, ive come across this problem a lot of times, so i thought id try and write a post to help others in the same situation. Bpdus are now used as a keepalive mechanism similar to what routing protocols like ospf or eigrp use. I am very familiar with configuring etherchannel on cisco switches. I need help with suggestions, we are obviously not getting something right regarding spanning tree and its burning us hard. What are spanning tree port cost, spanning tree port. Common spanning tree however consumes resources which can improve performance with less administrative overhead. The classic spanningtree uses a max age timer 20 seconds for bpdus before they are discarded.
Spanning tree protocol stp is designed to prevent problems related to bridging loops. Spanning tree design guidelines for cisco nxos software. Two good books that cover the topics of spanning tree protocol and the longmode path cost are. Spanning tree protocol in layer 2layer 3 environments. This video addresses an issue with spanningtree among a set of juniper ex 4200 series switches and cisco nexus series switches operating in a. On the cisco side, the show spanningtree command is showing port 47 as the bridge port and vice versa on the ex switch. Stp solves the problem by blocking redundant paths and allowing only a single active path. If you end up with a ton of vlans, you might even need to use mstp.
Spanning tree protocol in layer 2layer 3 environments the juniper networks position on layer 2 versus layer 3 juniper networks exseries ethernet switches can be deployed in either layer 2 or layer 3 environments, or a combination of both. Configuring stp protocol techlibrary juniper networks. Pvst is succeeding by cisco proprietary extensions like backbonefast, uplinkfast, and portfast. Spanning tree for example, massively important in a resiliant switching environment. In figure 332, port f03 on s2 is the forwarding port for vlan 20, and f02 on s2 is the forwarding port for vlan 10. We have a medium sized network running all juniper except for one building. Spanning tree protocol stp is a layer 2 protocol that runs on bridges and switches. Spanning tree works by selecting a root switch then selecting a loopfree path from the root switch to every other switch. The spanning tree protocol must be either disabled on all switches, or disabled on all switches. The time spanning tree protocol stp takes to transition ports over to the forwarding state can cause problems.
Stuck between the carrier and 3rd party telco support. I have the juniper connecting to the cisco via ae0po1. Ciscos and the other venders ive listed, base entry switches except the cisco smb range, but still to some extent have many more features as standard the the hp. Juniper however also supports vstp vlan spanning tree to allow mixed vendor compatibility between juniper and cisco networks however in a pure juniper network it is recommended to stay with a common rapid spanning tree. How spanning tree protocols work, choosing a spanning tree protocol. When it is enabled, bpdu guard puts the port in an errordisabled state on receipt. Configuring rapid spanning tree protocol rstp junos workbook. If you want to understand stp you should read the algorhyme poem by radia. In this mode, you assign vlans to a spanning tree instance. The resulting tree, with the root at the top, spans all bridges in the lan, hence the name. When a switch receives a bridge protocol data unit bpdu in its port, it increments the path cost with the cost of the incoming port. Spanningtree protocol overview techlibrary juniper.
Issue with stp over lacp trunk and juniper ex read 17856 times. The switch vendor juniper networks in turn developed and implemented its vlan spanning tree protocol vstp to provide compatibility with ciscos pvst, so. Interoperability of juniper and cisco devices free download as word doc. Some general commands that can be compared between.
Cisco implements a proprietary flavor of spanning tree protocol, which is pervlan in nature. Interoperability of juniper and cisco devices network switch. Spanning layer 2 between data centers netcraftsmen. Configuring rapid spanning tree protocol rstp the root bridge is the only switch in the layer 2 topology, rather it be stp, rstp or vstp vlan stp that will forward traffic out on all ports. I am working with a network that are primarily all hp procurve switches, about 22 2610, 2810, 2530, 2510 models and a 3750 core stack. The spanning tree protocol stp is a network protocol that ensures a loopfree topology for any bridged ethernet local area network. The original version of stp legacy stp only supports a single instance of spanning tree in a bridged network, typically referred to as common spanning tree cst. Ex series,qfx series,mx series,srx series,m series,nfx series,t series,acx series. You should be able to get this to work if you want spanning tree running between. Rstp behaves the same as stp, as both only implement a single spanning tree instance for all vlans over trunk. Hi we are in a process where we have to connect the hp switches to the cisco switches in the network. Now as per our recent studies, we have figured out that the hp switches does not supp. Stp configuration between cisco and hp cisco community. This section describes the advantages and disadvantages of deploying layer 3 versus layer 2 solutions.
I need help with suggestions, we are obviously not getting something right. So weve seen a few now in the cisco curriculum, 802. Rstp might process bpdus, which do not comply with the ieee standard. This gives rise to certain considerations in a multivendor environment. This means that the cisco switch only sees one instance of spanning tree from the juniper on the native vlan vlan 1, and cannot detect loops from the juniper switch on any other vlan. The basic function of stp is to prevent bridge loops and the broadcast radiation that results from them. Understanding stp, understanding system identifiers for bridges in stp or rstp instances, configuring stp on ex series switches cli procedure. This factor of time is not an issue for many people, but it can cause problems for. Spanningtree protocol types online cisco training materials. The root bridge is flapping between juniper ex and cisco.
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