The classic spanningtree uses a max age timer 20 seconds for bpdus before they are discarded. Lets keep going lets bring a cisco 3750e into the topology and lets talk about utilizing spanning tree. On the cisco side, the show spanning tree command is showing port 47 as the bridge port and vice versa on the ex switch. Avaya and cisco interoperability technical configuration guide. Vlan trunking between juniper ex cisco catalyst and. 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. Cisco and force10 stp spanning tree interoperability hasan. Rapid spanning tree protocol rstprstp is defined in ieee 802. This gives rise to certain considerations in a multivendor environment. Cisco is a pioneer in the manufacture of networking equipment and was founded in the early 1980s 1984. Switch 2 cisco catalyst 3550 switch 1 dell powerconnect 3324 switch 4 dell powerconnect 5224. I need help regarding the following spanningtree issue. Rstp behaves the same as stp, as both only implement a single spanning tree instance for all vlans over trunk.
It is an evolution of stp that provides faster convergence than stp. 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. May 21, 2018 for the love of physics walter lewin may 16, 2011 duration. Avayas split multilink trunking smlt is not compatible with the spanning tree protocol so you cant run stp over smlt links. 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. Aruba 3810m with juniper ex4500 spanningtree compatibility. The basic function of stp is to prevent bridge loops and the broadcast radiation that results from them.
To assess rtg interoperability, network test and juniper engineers set up three juniper and cisco. I have a cisco 3560 connected to each of the 5412 with l2 links. Introduction to spanning tree spanning tree is a protocol that runs on our switches that helps us to solve loops. Vstp is based on rstp and can also be configured in a purely juniper network if you have a need to use different switches as the spanningtree root bridge for specific vlans. 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. Configuring vlan spanning tree protocol vstp junos. 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. Spanning tree interoperability between hp and cisco.
He wrote a presentation named hp cisco interoperability and migration scenario. In the previous lab if you read andor completed it you learned about ciscos proprietary per vlan spanning tree protocol which enables a spanningtree. Playbook switch to a better switch juniper networks. Bpdus are now used as a keepalive mechanism similar to what routing protocols like ospf or eigrp use. Understanding and configuring spanning tree protocol stp. Hi1 i have cisco 2960x connected with juniper ex 4200. Spanning tree and vlan confusion ars technica openforum. Configuring vlan spanning tree protocol vstp junos workbook. Juniper networks ex series cisco catalyst interoperability test results 3 cases noted as not tested refer to situations where either the juniper or cisco software image tested did not support a given protocol. Spanning tree stprstp interoperability of ex switches. For loop avoidance, there is spanningtree running on all switches involved. For the love of physics walter lewin may 16, 2011 duration.
I need help regarding the following spanning tree issue. Stp configuration between cisco and hp cisco community. Configuring vpn routing and forwarding vrf on juniper. Cisco and force10 stp spanning tree interoperability. These application notes were requested by a customer for a proof of concept. The main difference between rapid spanning tree protocol rstp ieee 802. Spanningtree interoperability between procurve core.
Cisco has several documents about how to interoperate with non cisco switches e. Spanning tree protocol interoperability with cisco arista networks. My main target was to check if ciscos pvst protocol will work together with junipers vstp protocol. Spanning tree interoperability this application note relates to the following dell powerconnect products. Configuring vpn routing and forwarding vrf on juniper j4300. It is a bit cisco centric but still applies to all switchesbridges ethernet devices running the spanning tree protocol stp have been implemented in. Cisco and juniper switch interoperability networking. Appendix b lists the software versions tested for each switch.
The spanning tree protocol stp is a network protocol that builds a loopfree logical topology for ethernet networks. As my objective is to run rapid spanning tree between cisco osrs and juniper mx480s on two vlans only as they will be carrying voice trafic. On the cisco side, the show spanningtree command is showing port 47 as the bridge port and vice versa on the ex switch. Introduction to spanningtree spanningtree is a protocol that runs on our switches that helps us to solve loops. Cisco uses a proprietary protocol for spanning tree, and it breaks interoperability. Lets get this out the way, avaya does not recommend that you disable spanning tree. Difference between rstp and pvst difference between. Guys, i found this on the networkworld, written by scott hogg and it pretty much covers all the issues you will see with stp. Theres now a half dozen or more different flavors of spanning tree protocols. Spanning tree protocol stp with juniper networks ex series ethernet switches.
Interoperability of juniper and cisco devices network switch. 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. Avaya has release an updated technical configuration guide geared towards the interoperability between cisco and avaya equipment. Mstp connects all switches and lans with single common and internal spanning tree cist. Spanning tree protocol in layer 2layer 3 environments.
However, some vendors extreme networks, force10, brocade and junipers vstp do have switchesimplementations that interact with cisco. Remember, every time we modify the spanning tree topology, like changing priorities, spanning tree will need to converge. It means that you will run an spanning tree instance per vlan. 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. There are also a lot of other documents about this subject, which you will find if you do a. Understanding and configuring spanning tree protocol. The dell switch will only use the stp instance on the native vlan and use this to build a common spanning tree cst. A single root bridge is elected and tasked with path calculation for the common spanning tree cst. Spanning tree protocol stp the original spanning tree. For loop avoidance, there is spanning tree running on all switches involved.
The configuration guide aims to help networking professionals successfully interconnect juniper networks and cisco ethernet switches using a variety of popular layer 2 and layer 3 protocols. Ive got some cisco 2950s that i will be slowly replacing with juniper ex 3400 switches and would like to know if im going to run into any stp. Pvst is succeeding by cisco proprietary extensions like backbonefast, uplinkfast, and portfast. I have a network core of 2 hp5412 procurve connected together using vrrp over a l2 tagged link. Configure and troubleshoot cisco spanning tree stp. Spanning tree interoperability with cisco switches. Configuring rapid pervlan spanning tree protocol free. Juniper however does offer a compatibility feature to work with cisco known as vlan spanningtree where each vlan will have its own spanningtree instance.
My main target was to check if cisco s pvst protocol will work together with juniper s vstp protocol. This version is slow to converge, and youre likely to only occasionally run into it. Youve got interoperability with bestofbreed solutions from any vendor. Juniper asked network test to validate that rtg would operate between juniper and cisco switches with no additional configuration needed on cisco switches with additional trunk ports. Cisco has several documents about how to interoperate with noncisco switches e. 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. The wifi interoperability section also uses a cisco 5508 controller and cisco 3602 and cisco 3702 access points.
Stp configuration between cisco and hp there is this command available on the hp switches spanningtree priority xx forceversion rstpoperation or stpcompatible, the value xx can be upto 15 which equals a priority of 61440 15 x 4096. Wired intelligent edge campus switching and routing view all. This way, we are setting the priority for both vlan 1 and 10. Trunking would be even worse in this case, because spanning tree on cisco wouldnt see jack shit except on the. Juniper networks cisco systems switch interoperability cookbook. The document covers a lot of information including etherchannel to mlt interoperability, spanning tree interoperability, nortel ip phones connecting to cisco switches and cisco ip phones connecting to nortel switches. Spanning tree protocol stp is a layer 2 protocol that runs on bridges and switches. The following diagram depicts a typical switched topology in an enterprise setting with spanning tree disabled. The main purpose of stp is to ensure that you do not create loops when you have redundant paths in your network. This is useful when you need different layer 2 behaviors per vlan, for example you can have different root bridge on different vlans so that spanning tree does not have to run as a whole on the layer 2. Exseries switches follow the poststandard version of ieee multiple spanning tree mst. Application notes implement multivrf between a juniper j4300 enterprise router at a main site and a cisco catalyst 3550 multilayer switch at a branch site.
You can set your cisco devices to run mst, by issuing the command in config mode. You need to either convert to rstpmstp on the cisco side, or implement vstp on the juniper which is. 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. On the cisco devices, the command spanningtree pathcost method long must be entered to make it. Juniper networks ex series cisco catalyst interoperability. It means that you will run an spanningtree instance per vlan. If you end up with a ton of vlans, you might even need to use mstp. By following the stepbystep procedures described in the attached document, it should be possible to verify interoperability and to pass traffic between. This section describes the advantages and disadvantages of deploying layer 3 versus layer 2 solutions. The switch vendor juniper networks in turn developed and implemented its vlan spanning tree protocol vstp to provide compatibility with cisco s pvst, so that the switches from both vendors can be included in one lan. This table shows the support for mst in various catalyst switches. If a switch misses three bpdus from a neighbor switch it will assume connectivity to this switch has been. Learn how to configure juniper switches to play nicely with cisco switches when it comes to spanning tree protocol stp. With this book, youll learn all about the hardware and asic design prowess of the ex platform, as well as the junos software that powers it.
Juniper cisco interoperability cookbook network test. Multiple spanning tree mst is an ieee standard inspired from the cisco proprietary multiple instances spanning tree protocol mistp implementation. Spanning tree stprstp interoperability of ex switches with. Details for each protocol are discussed later in this document. Juniper networks ex series switches interact with the various types of bpdus the cisco switches send out. What you need to be aware of is that a non cisco switch does not support pvst. Cisco implements a proprietary flavor of spanning tree protocol, which is pervlan in nature. 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. Apr 17, 2007 multiple spanning tree mst is an ieee standard inspired from the cisco proprietary multiple instances spanning tree protocol mistp implementation. This document assumes that the reader is familiar with rapid stp rstp 802. Dell networking and cisco spanning tree interoperability. Understanding multiple spanning tree protocol, or how to convert the cisco switches to mst e.
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