Metro link and Spanning tree problem

HI all,
We have 4 switches connected like the diagram given below.
What happens when link between mux to mux goes down mean any fiber cut in SP network our ethernet interface from switch 1 doesn't go down and for vlan 2 all data goes black holed.
bcos switch 1 interface connected to mux is getting keepalive from tejas mux and it remains up even if fiber goes down between both the mux's.
and if link doesn't go down than all the data from vlan 2 goes black holed
please help ASAP

Sorry, still not clear to me.
If STP does not unblock a port as a result of a failure between the mux and the provider network, it means that it keeps receiving BPDUs through the mux. That means that the mux is switching traffic for the corresponding vlan between the two switches, and that means that no way STP can unblock without creating a loop (which is not the desired effect I guess).
Now, when this link between the mux and the provider network fails, why do you lose connectivity? You have two links between the mux and the provider network and the vlan exists in the two mux. Does it mean that the link between the mux and the provider network only carry one vlan? If this is the case, can't you prevent the mux from switching traffic between the two switches for the given vlan.
You see that there are way too many "ifs" in what I've just written. We need to understand what the "muxes" are.
Regards,
Francois

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I'm sure spanning tree is a checkbox somewhere in the web interface.
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Thank you, Tom
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Hello Thomas,
Thanks for using the Cisco Small Business eSupport Community. I've looked through the articles that are available in our Knowledge Base and found a few that I hope will be able to assist you in setting up spanning tree and link redundancy on your SFP300s:
In regards to link redundancy, the following article on LAG can hopefully provide some guidance:
Link Aggregate Group (LAG) Configuration on 200/300 Series Managed Switches
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Configure Spanning Tree Protocol (STP) Status and Global Settings on 200/300 Series Managed Switches
Setup Spanning Tree Protocol (STP) on a Interface on the 300 Series Managed Switches
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Best,
Gunner

The iPad does not ship unless he closed ITunes does not recognize or computer If he shipped fully closed device I bought a charger and bought Link and the same problem persists IPad without Jelbrak

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Rapid Spanning Tree Problem

Hi all,
I am experiencing an RSTP problem. I have two swtitches connected via wireless link, the port is in trunk mode, the native vlan is vlan 1 the problem is that bpdu's are exchanged for other vlan's but not for vlan 1, when i connect a second backup wireless link it causes the loop, it seems that there are no bpdu exchanges between switches for vlan 1, also in trunk ports i see that BPDU's for vlan 1 are sent by both switches but they do not receive any BPDU's from each other. Any explanation about thiss issue ?
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I would need to know some things to troubleshoot this:
1. Is VLAN 1 the native VLAN of the trunk, on both sides?
2. I presume VLAN 1 is in the allowed VLANs list on both sides of the link?
3. If the native VLAN is not 1, is the native VLAN allowed on the trunk, on both sides?
4. What model of switch is it, and what version of the software?
5. Can you do a show run int for each end of each trunk link?
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CSS Bridging and Spanning-tree

Greetings:
I have a configuration where I have two CSS attached to two WS 3550 switches. I'd like to connect an interface from each VLAN on each CSS to both 3550 switches (see attached). I have a problem when both of the interfaces are active in a VLAN. The spanning tree breaks down (both CSS see themselves as the root and one of the 3550's becomes the root for the two 3550's). Additionally, I had a situation where the ISL link between the 3550's shut down due to excessive spanning-tree errors.
I looked into using unconditional bridging, but that would cause problems on the "outside" interfaces as we can't predict how the VLAN's will be configured on that side of the CSS. We actually have a split situation where layer-3 path forwarding decisions are preferable on hte outside and layer-2 path forwarding descisions are preferable inside.

Wiwells,
Honestly, when I look at what you are doing, I feel you are making it overly redundant on the bridged side of things.
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Two iterators browsing the same data (a table and a tree) problem

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Noone has tried this again?

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Hi guy,
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Port 65 (Port-channel1) of VLAN10 is root forwarding
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Designated root has priority 4106, address 0013.05ee.bac8
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Designated port id is 144.2999, designated path cost 0
Timers: message age 15, forward delay 0, hold 0
Number of transitions to forwarding state: 1
Link type is point-to-point by default
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one sec later.
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Port 65 (Port-channel1) of VLAN10 is root forwarding Port path cost 3, Port priority 128, Port Identifier 128.65. Designated root has priority 4106, address 0013.05ee.bac8 Designated bridge has priority 8202, address 0013.05ee.bac8 Designated port id is 144.2999, designated path cost 0 Timers: message age 15, forward delay 0, hold 0 Number of transitions to forwarding state: 1 Link type is point-to-point by default BPDU: sent 5, received 603
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N7KA
spanning-tree vlan 1-10 priority 4096
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peer-switch
N7KB
spanning-tree vlan 1-10 priority 4096spanning-tree pseudo-information vlan 1-10 designated priority 8192
vpc domain 200
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We have a issue similar to this in our environment. I am trying to upgrade the existing 3750 stack router with 2 Nexus 5596 running VPC between them. For the transition I have planned to create a channel between 3750 stack and 5596's. Once this environment is set, my plan is to migrate all the access switches to N5k.
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About Spanning tree problem

I am a newbie for cisco switch.
I need a failover solution for both switch and AP Bridge link on both side.
I have 2 of location (Location A and Location B)
Location A
There has 3 set of cisco 2960 switch.
switch C is active switch
switch A is redundancy switch , it will be active when primary Wi-FI Link and switch C is failure.
Location B
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switch B is redundancy switch ,it will be active when primary Wi-Fi Link and switch D is failure.
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As show my diagram, Can it achive failover for both switch and AP bridge link if I use this network design
Please help to comment
Thanks
John

Hi John,
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Now the most important thing in this design is to make sure that the Wifi bridges pass STP BPDU traffic, if they don't, this will not work.
Even if one of the switches fails on the active path, the backup path would still kick in..
Let me know how you go with this..
please rate helpful posts.. :)

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CAT4006 as PLWARBITES008 connected to:
Connection 1
============
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Note: Connection down
Connection 2
============
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NOte: Connection is up
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I got this:
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Device ID: PLWARBITES008
Entry address(es):
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Platform: cisco WS-C4006, Capabilities: Switch IGMP
Interface: GigabitEthernet1/1, Port ID (outgoing port): GigabitEthernet1/1
Holdtime : 145 sec
Version :
Cisco IOS Software, Catalyst 4000 L3 Switch Software (cat4000-I5S-M), Version 12.2(25)EWA1, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
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Hi:
That is called PVSTP , Per vlan Spanning tree protocol. It is default feature with L2 & L3 switches of Cisco. One connection is in forwarding state & one is in blocking state.
regards
Sandipani C

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Folks,
I have 2 switch groups.
2 SGE2010's with VLAN's defined as 10,20 and 30
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Vlan 20 is the workstation VLAN, and all workstations point to the switch as their default GW
Vlan 30 is the ip phone VLAN, and all phones use this as their gateway.
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I have attached an image with a diagram of our current set up.
Any help/advice would be much appreciated.

Tom,
I remember our conversation a few weeks ago. I did not get a chance to have a go at MSTP, mainly because I have no expierence with it, and looking at the configuration properities, it looks a little daunting.
It has also been a very busy few weeks with the deployment of 200+ phones across several sites, and the system is functioning great with out the LAG trunk, I am just trying to plan for the future.
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Challenge: Spanning Tree Control Between 2 links from Switch DELL M6220 to 2 links towards 2 switches CISCO 3750 connected with an stack (behavior like one switch for redundancy)

Hello,
I have an Spanning tree problem when i conect 2 links from Switch DELL M6220 (there are blades to virtual machines too) to 2 links towards 2 switches CISCO 3750 connected with an stack (behavior like one switch for redundancy, with one IP of management)
In dell virtual machine is Spanning tree rapid stp, and in 3750 is Spanning tree mode pvst, cisco says that this is not important, only is longer time to create the tree.
I dont know but do you like this solutions i want to try on sunday?:
Could Spanning tree needs to work to send one native vlan to negociate the bdpus? switchport trunk native vlan 250
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¿could you help me to control the root? ¿Do you think its better another solution? thanks!
CONFIG WITH PROBLEM
======================
3750: (the 2 ports are of 2 switches 3750s conected with a stack cable, in a show run you can see this)
interface GigabitEthernet2/0/28
description VIRTUAL SNMP2
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 4,13,88,250
switchport mode trunk
switchport nonegotiate
logging event trunk-status
shutdown
interface GigabitEthernet1/0/43
description VIRTUAL SNMP1
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 4,13,88,250
switchport mode trunk
switchport nonegotiate
shutdown
DELL M6220: (its only one swith)
interface Gi3/0/19
switchport mode trunk
switchport trunk allowed vlan 4,13,88,250
exit
interface Gi4/0/19
switchport mode trunk
switchport trunk allowed vlan 4,13,88,250
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F.Y.I for catylyst heroes - here is the equivalent config for SG-300 - Vlan1 is required on the allowed list on the catylyst side (3xxx/4xxx/6xxx)
In this example:
VLANS - Voice on 188, data on 57, management on 56.
conf t
hostname XXX-VOICE-SWXX
no passwords complexity enable
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!CATYLYST SIDE
!Must Explicitly allow VLan1, this is not normal for catalysts - or spanning tree will not work ! Even though it’s the native vlan on both sides.
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Mono spanning-tree and PVST

Refering to these two links
http://www.cisco.com/en/US/tech/tk389/tk390/technologies_tech_note09186a0080094665.shtml
http://www.experts-exchange.com/Hardware/Routers/Q_21349385.html
IEEE 802.1Q defines a single instance of spanning tree running on the native VLAN for all the VLANs in the network which is called Mono Spanning Tree (MST). This lacks the flexibility and load balancing capability of PVST available with ISL. However, PVST+ offers the capability to retain multiple Spanning Tree topologies with 802.1Q trunking.
IEEE 802.1Q defines a single instance of spanning tree running on the native VLAN for all the VLANs in the network which is called Mono Spanning Tree (MST). This lacks the flexibility and load balancing capability of PVST available with ISL. However, PVST+ offers the capability to retain multiple Spanning Tree topologies with 802.1Q trunking.
http://networking.ringofsaturn.com/Certifications/BCMSN.php
Per-VLAN Spanning Tree (PVST) ? A Cisco proprietary method of connecting through 802.1Q VLAN trunks, the switches maintain one instance of the spanning tree for each VLAN allowed on the trunk, versus non-Cisco 802.1Q switches which maintain one instance for ALL VLANs. This is the default STP used on ISL trunks.
http://www.informit.com/content/images/1587051427/samplechapter/1587051427content.pdf
The 802.1Q standard defines one unique Spanning Tree instance to be used by all VLANs in the network. STP runs on the Native VLAN so that it can communicate with both 802.1Q and non-802.1Q compatible switches. This single instance of STP is often referred to as 802.1Q Mono Spanning Tree or Common Spanning Tree (CST). A single spanning tree
lacks flexibility in how the links are used in the network topology. Cisco implements a protocol known as Per-VLAN Spanning Tree Plus (PVST+) that is compatible with 802.1Q CST but allows a separate spanning tree to be constructed for each VLAN. There is only one active path for each spanning tree; however, in a Cisco network, the active path can be
I could not get exactly what these Terminology (PVST, instance, PVST+, MST, etc) trying to achieve ?
Any URL and online resource help me to do some extar reading to clarify these terminology

Hi,
The URLs that you have provided all explains the same technical details in different fashion.
I will summarise them here for better clarity.
There are two separate technologies that needs clarity.
1) Method of Trunking many vlans across a link
2) Spanning tree
Now for point 1, we have the IEEE standard 802.1q, which mentions how multiple vlans can be carried across a link. As per this standard a 4 byte tag will be inserted in the ethernet packet, ( inserted between the Destination mac address field and the ethertype field)
This tag will contain the vlan identifier info and some other details ( available in the urls that you have highlighted)
Cisco has a proprietary technology called ISL which effectively does the same job in a different fashion but can only be used in cisco devices.
Now for point 2, again we have IEEE standards like 802.1d ( common/mono spanning tree), 802.1w/RSTP ( Rapid spanning tree) and 802.1s/MSTP.
In 802.1d, there will be only one spanning tree process/instance running for the whole network, irrespective of how many vlans are involved in the network. Hence the whole network is treated as one common domain by the STP protocol.
So, there can be only one root bridge in the network and other bridges will intelligently block the redundant links, we wont have much control to effectively utilise the redundant links.
IEEE 802.1w/RSTP also works in the same fashion, but the convergence time is very fast in this protocol.
Here also there is only one spanning tree instance involved.
In both the above STP protocols, there is only one instance/process of the protocol running in the network, which is common for all vlans. Hence these protocols consume only very less CPU utilisation.
In 802.1s/ MSTP ( multiple spanning tree), extends the 802.1w Rapid Spanning Tree Protocol (RSTP) to have multiple STP instances. In this protocol, we can group the desired vlans in to one Instance of the protocol.
Say for example, lets assume a typical campus network with multiple access switches, 2 distribution/core switches.
Access switches having dual connectivity to the distribution/core switches.
In this topology if we deploy 802.1d or 802.1w, the redundant links from the access switches to the distribution/core switches will be blocked. Only one uplink from the access switch to the distribution layer will be working at any point.
In this network, only one distribution/core switch will be root bridge for the entire network.
But if we deploy 802.1s for this network, we can design it as follows.
We can split the vlans in to two groups,
Group1 => vlan 1 to 50
Group2 => vlan 51 to 100
We can create two instance of MSTP protocol with the following mappings
Instance 1 => for Group 1, with one distribution/core switch as the root bridge
Instance 2 => for Group 2, with another distribution switch as the root bridge
--Continued

Metro link and Spanning tree problem

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