Cisco Switches :: SGE2010p VLAN Trunks Spanning Tree And A Port Blocked

Jul 21, 2012

We are upgrading out internal office network. I have setup 4 switches and 1 router using the following config.
 
-2 SGE2010p's are stacked together forming vlan 30 (to be used for phones)

-2 SGE2010's stacked for workstation's under vlan 20
 
Both switches are apart of vlan 1 (the default)Ports 1 on each stack are connected to a Cisco 890 (port fe2 and fe3) in trunk mode. Ports 2 and 3 are in an LAG group and connected to the neighboring stack (I have attached a diagram), and are also in trunk mode).At this point one port (port 1 on either stack) goes into blocking mode, and I get why ,it's a physical loop.I need more than a 100mb link between switches (which is what pulling the LAG between switches gets me), but I don't want to route phone traffic through my workstation switches to get out of the LAN.Is it possible using these switches and router to have a LAG between stacks and a link to the router for traffic to 0.0.0.0 ?

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Cisco Switches :: SGE2010 Switches / VLANs And A Blocked Port In Spanning-tree?

Aug 20, 2012

I have 2 switch groups.
 
2 SGE2010's with VLAN's defined as 10,20 and 30
 
Vlan 10 is the management VLAN, and it uplinks to our border router.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.
 
I would like to put a LAG between said switches, we have some servers on the ip phone switch that need to be accessed by the workstation clients, and the single 100mb link through the router is probably not going to be enough.As I understand it, because the switches have different networks on them, a simple lag will not work. I did create a lag, and assign ip addresses to each side, however in that mode, it doesn't appear I can block vlan 10 from transiting the LAG, and with out that block I will end up with a logical loop, and spanning-tree will block one of the uplinks, or the LAG itself.

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Cisco :: Why Wouldn't Use Spanning - Tree Portfast On Trunk Port Other Than Trunk Between Two Switches

Apr 11, 2013

Is there really any reason why you wouldn't use spanning-tree portfast on a trunk port other than a trunk between two switches? We have it enabled on all ports except for the fiber trunk between two non-stacked switches and the trunk ports connected to our Astaro firewall.I'd like to enable it on the ports to the firewall unless that would cause issues.

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Cisco Switching/Routing :: 3750 No Spanning Tree Vlan

Feb 29, 2012

I have a 3750 switch which has the command 'spanning-tree vlan **'.  I am struggling to remove this command, as this particular VLAN is one I want to distribute across our network.I have so far, set the switch to VTP Transparent mode and removed the VLAN from the database, this removes the command.  If I then put the switch back to VTP client mode (or manually add the VLAN, while in in VTP transparent mode) then the command comes back.  Submitting the command 'spanning-tree vlan **' command has no affect.

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Cisco :: Spanning Tree Between Switches Accordingly

Nov 18, 2012

Do switches learn link state information from routers and optimise the spanning tree between the switches accordingly ?

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Cisco Switching/Routing :: 3750X-12S No Spanning Tree On Native VLAN

Oct 7, 2012

I am migrating an existing LAN from 3550 to 3750X-12S. In the existing configuation, I´ve got some trunks with native VLAN <> 1. The native VLAN is also used for user data transport. With IOS 15.0(1)SE3 on 3750X I recognized, that per default behavior PVST is not active for a VLAN defined as native, even if the corresponding trunk is up and trunking. My current workaround is to add a "switchport access vlan" command on the trunk even this one never should become an access port. With this statement only the switch is activating the PVST for the native VLAN. For all other vlans PVST works as exspected. [code]

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Cisco WAN :: How Spanning Tree Works On L3 Switches

Oct 25, 2012

I've got a bit of a query regarding how spanning tree works on L3 switches?So say we have a few 3550's connected together and spanning tree has converged and everything is looking ok. We then introduce routing into the network, does STP still operate in the same way or is this layer 2 feature now redundant because routing has taken over?I just couldn't figure out if STP still operates at layer 2 to prevent loops and routing sits on top to route the traffic?

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Cisco Switching/Routing :: 6500 Cannot Get VLAN In Spanning Tree Forwarding State

Dec 9, 2012

We have a pair of 6500 switches, each having a trunk going to each access switch. We set the spanning tree priority on Core1 so it is the root bridge for all VLANs. We have two different types of access switches:

-3550 setup as VTP client and ISL
-2960 setup as VTP transparent and dot1q.
 
Pruning is disabled but we use "switchport trunk allowed vlan" to restrict which VLANs go through each trunk. When we need to permit a VLAN through a trunk, we simply run "switchport trunk allowed vlan add <VLANID>" on the access switch and both core switches. If it is a 2960 in VTP transparent mode, we must set the VLAN to active. Once this is done, a "show int trunk" will reflect the new VLAN in "Vlans in spanning tree forwarding state and not pruned" for Core1.
 
I recently went through this process to add VLAN 250 on a 3550 access switch, but the VLAN is not listed in STP forwarding state and not pruned. I tried removing the VLAN from the trunks and redoing it, but there is was no change. I tried adding VLAN 257, but the same behavior happened. I then tried trunking the same VLANs to a few other access switches. Three other 3550s experienced the same behavior, but I was able to trunk the VLAN to a few 2960 switches. At this point, I figured it might be related to some kind of limitation of VTP or the 3550 switches. I provisioned a new 3550 with the same IOS and settings (VTP client, ISL). To my surprise, all VLANs configured were in STP forwarding state and not pruned.

Running show spanning-tree on the core and access switch shows VLAN 250 as designated FWD. I confirmed we are not hitting the limits in "show spanning tree summary totals" on the Core or Access switches. I also confirmed we are not hitting the virtual port limit by running "show vlan virtual-port slot x."My next action might be to shut/no shut the uplink to Core1 from the access switch, but I'm not sure if that will fix it and even if it does, I have no clue what caused the issue.

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Cisco Switching/Routing :: Passing VLAN / Spanning-tree Between 2960S And 3750X

Oct 8, 2012

Has anything changed in the way of defaults for creating a trunk port and spanning-tree between a 3750x and the newer 2960s? I have one of each I just took out of the box and applied my standard switch configuration template but I cannot get my VLANs that are configured on my 3750X to appear on the 2960S. I find nothing that is blocking and everything seems to be forwarding and I am running out of things to check.

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Spanning Tree Protocol For Extreme Switches?

Feb 28, 2011

download speed is getting slower in lan, file and print sharing also take long time.

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Cisco WAN :: 2 X 3750 Configure Spanning Tree On All Switches

Jan 8, 2013

I have a question in regards to configuration I'm planning to implement. I currently have 2 x 3750 running in a stack. I would like to add 1 x 870 router connected to both switches.It's important for me that 870 is always available (it will only be used as a backdoor for our management network through WAN) but I don't want it to participate in any switching (including switching for management network unless it's going through this backdoor WAN). Do I need to configure spanning tree on all switches or stack is automaticly working as a 1 logical unit?As router is only using 100MB/s connection, how I can prevent this router from switching packets with other switches?

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Cisco :: Spanning-tree Every Port Go Into Listening / Learning State

Apr 4, 2012

Ages ago I was shadowing someone making a change on the network. I cannot remember which spanning tree version was running and cannot remember the config of any port either. What I do remember is that every switch port on the 2960 switch went orange and an outage occured, where the ports went into listening / learning mode. I assume that the STP was just the default ieee 802.1D.

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Cisco Firewall :: 3750-x Stack Port Acl And Spanning Tree

Oct 3, 2011

I have a pair of 3750-x switches stacked together. Using spanning tree with our upstream provider I have an active line in port GigE 1/0/25 and a blocked redundant line in GigE 2/0/25. I have setup a port based acl as below on 1/0/25 which is a port on the current master switch. Do I need to manually set this on 2/025 as well? Just wondering what would happen if the line to the master switch was to disappear or if the master disappeared completely whether the acl would automatically be applied to 2/0/25.

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Cisco Switching/Routing :: 5500g 3com Switches - Spanning Tree

Jan 10, 2013

I have problems too when I connect 3com and Cisco.
 
I have 2 5500g 3com switches connected with 2 links. If LACP is disable, this causes serious problems and STP not works.
 
Logically , the link, is a port trunk with all the vlans permitted. One switch has STP enable and the other RSTP. Why this not works fine? I need to configure MSTP maybe? PVSTP is not allowed on this switches.

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Cisco Switching/Routing :: 8192 / Spanning Tree Port Priority Value?

Sep 19, 2012

Why is it when I set the port priority for example to 8192 and I then do a show spanning-tree vlan 1 it shows as 8193, does it add the vlan number?  so if it was vlan 10 it would be 8202?

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Cisco :: Core Layer Switches After A Spanning-tree Topology Change Occurs

Mar 24, 2013

I've been taught/under the impression that vlans and stp stay in the access layer to prevent bridging loops and broadcast storms from taking down the whole network. Well I was reading about backbonefast and how it "Enables fast convergence in the networkbackbone or core layer switches after a spanning-tree topology change occurs." Now I thought that from the distribution layer up we use a routing protocol.

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Cisco Switching/Routing :: 2960 Switch Stack Spanning Tree Recalculate From Port One

Feb 23, 2012

2960 switch stack (flex) Spanning tree re-calculate from stack port one?I need to identify with port in the stack is causing the re-calc  I have four 48 port switches and show spanning detail only indicates stack port 1.

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Cisco Switches :: Sge2010p (v5) - How To Set QoS For VoIP Vlan

Jul 24, 2011

I have configured 2 Vlans on the network. 1 - native Untagged for data traffic and 100 Tagged for VoIP.I have 4 SGE2010p switches 2- of them in stack working in L3 mode and 2 connected to the stack via single ethernet links in L2 mode.I have IP phones with trunked ports -Vlan100 tagged and 1 untagged. I have set CoS 5 for Voice Vlan 100 on the phones and CoS 5 to queue 3 mapping (in basic mode) on all switches.But it seems to not work at all.Should I use Advanced QoS mode?Where Can I find some QoS configuration example for Voice Vlan on SGE2010p switches?

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Cisco Switches :: SGE2010P - VLan For VOIP?

Mar 11, 2012

I just purchased two Cisco switches (SGE2010P) for the new Mitel 5000 Phone System. The Mitel vendor programmed and setup the phone system for us, but they couldn’t figure out the VLAN setup on the my switch. So now I have everything on one network and I am stuck on my own to figure the VLAN on my own. So please, some step by step on the settings on the switches, the router and the server (DHCP).

Here is what I have now:
2 floors building with a Cisco SGE2010P switch for each floor.Sonicwall TZ 210 routerWindows 2008 R2 server for DHCPMitel 5000I have the switch on Layer 2 at this moment, but I can switch it to Layer 3 if that makes the process easier and less steps.My network as follows: Router: 192.168.123.254Windows Server: 192.168.123.9Switches: 192.168.123.5 and 192.168.123.6Mitel 5000 server: 192.168.123.7 (has to be changed)The PCs are connected to the phones.

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Cisco Switches :: How To Implement Multiple VLAN On SGE2010P

Mar 7, 2012

I am new to VLANs and Cisco SMB switches. I have a new SGE 2010P switch and i am trying to configure different VLANs, one for data, one for Voice and the other for server.
 
Is there any tutorial on how to configure VLAN, by the way i tried to used the web interface and admin guide, it totally confused my understanding of Vlans.

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Cisco Switches :: SGE2010P - Implement Span / RSPAN To A Vlan

May 1, 2012

I want to implement SPAN or RSPAN of a vlan. Can this be done with the SGE2010P?  I can't find the configuration guide on the Cisco Web Site.

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Cisco Switches :: SGE2010p / Configure Vlan To Reach Few Subnet?

Jun 9, 2010

Just got a new SGE2010P layer 3 switch. I'm trying to configure Vlan to reach a few subnet. I have the original 192.168.1.0/24 as vlan1. I want to reach our WiFi subnet 192.168.10.0/24. The WIFI router is directly connected.  It's new for me as the previous Job i was sorking with a ws-3750-48.
 
i did from console  change my switch to layer 3 mode... ( i want it as the DGW for each Vlan)from the web interface, i create a vlan4 for our WIFI Next i go to ipv4 to add an IP address to vlan 4 like 192.168.10.254 /24 As soon as I apply the IP the switch stop responding, Ping request time out..  i need to reboot the switch..

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Cisco Switches :: Port Mirroring Limit Of 8 Ports On SGE2010P

Jan 24, 2013

Recently our company purchased 3 Lynksys SGE2010p, At the moment they work as a stack  but as we are implementing UCCX we need to mirror 15 ports but during the provisioning i've noticed that the limit is 8 ports per stack. I'm wondering whether this is a known issue or just a known limitation . I believe that most probably i'll need to move back to stand alone mode so i could configure 8 mirrored ports per switch.

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Cisco :: AP 1262n - Bridge And Spanning Tree

Feb 14, 2013

I have setup a WiFi bridge using two Cisco 1262n AP. I was able to get the bridge up and running for a little while. But soon after I plugged in a switch on the non root side of the bridge, the LAN on the root side started slowing and user were getting disconnected from the network. I suspect the Spanning Tree issue with the Bridge.
 
Couple questions:

I am using both the 2.4 and the 5Ghz bands for the Bridge.  I assume that this was OK and was needed to get the highest throughput, right?

I was making an assumption that the AP would take into account the possible spanning tree issues automatically when both bands are used in the same bridge.  Is assumption correct?  If not what is the correct configuration for spanning tree on a wireless bridge that uses 2.4 and 5 bands?

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Cisco :: How Spanning Tree Protocol Detects Loops

Sep 6, 2012

For last few days I've been reading about Spanning Tree Protocol ,L2 protocol and understood how it prevents loop in network ,various steps in STP but one thing i wanted to know how STP actually detects the loops in network so that it can prevent it.Somewhere I read STP uses BPDU as probe and detects loops I mean how it happen is when switch send a BPDU with Destination Address as multicast and receive same BPDU again mean there is loop in network .But is it how STP detects loops in network?

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Cisco :: Spanning Tree Root Mac Address References

Apr 19, 2012

I am trying to confirm which of my cisco switch is the spanning-tree root. I know which I prefer to hold the spanning-tree and I ran the command spanning-tree vlan 1 root on this switch,I would now like to check that this command has worked and so I ran the command 'show spanning-tree root active' and received the detail below.To make sense of this and determine which port the mac address references (From this I take it that 00b0.d0f5.cf31 is the root, how can I determine which port this is).

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Cisco :: 3560-E SNMP To Get Spanning-tree Status

Jan 16, 2012

I need to implement a "Spanning Tree Status" view on my NMS and I would like to use SNMP. I'm running Rapid Per-VLAN Spanning Tree Protocol on 3560-E (WS-C3560E-24TD) with IOS 12.2(55)SE.Using the ciscoStpExtensionsMIB MIB (CISCO-STP-EXTENSIONS-MIB) I see the stpxRSTPPortRoleTable table, which contains the stpxRSTPPortRoleValue value, and I think it could be fine for my job.The problem is that this table uses an index based on the standard dot1dBridge.1.4 table (dot1dBasePortTable) that does not report some interfaces: [code]I think the dot1dBasePortTable does not include those interfaces (5, 7, 8) where I do not run standard STP, but I need the dot1dBasePortEntry entries because I have to use them in order to get the interface ID (values like 10109, 10110, 10111).

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Cisco WAN :: 5500 Switch / Spanning Tree BPDU Error

Sep 12, 2012

I am getting this error on our Cisco 5500 switch. What it means
 
2012 Sep 13 14:49:37 PDT -07:00 %SPANTREE-2-RX_1QNONTRUNK: Rcved 1Q-BPDU on non-trunk port 3/20 vlan 72
2012 Sep 13 14:49:37 PDT -07:00 %SPANTREE-2-RX_1QPVIDERR: Rcved pvid_inc BPDU on 1Q port 3/20 vlan 72
2012 Sep 13 14:49:37 PDT -07:00 %SPANTREE-2-RX_BLKPORTPVID: Block 3/20 on rcving vlan 72 for inc peer vlan 235
2012 Sep 13 14:49:37 PDT -07:00 %SPANTREE-2-PORTUNBLK: Unblock previously inc port 3/20 on VLAN 72

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Cisco Switching/Routing :: Maximum Spanning Tree Instances 128

Apr 24, 2013

I read that maximum spanning tree instance number is 128, is there any switches that can go more than128 instances ? or can we do this from IOS updates ?

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Cisco Switching/Routing :: 2960s / Redundancy Without Spanning Tree?

May 8, 2012

I want  to have an opinion that which switch shall I replace the Cisco 2960s  with so as to elimintae the need for spanning tree in there but then what would be the design look  like between Netscreen and those new switches. Also would it be vendor independant to work Between Cisco and Netscreens/Cuberguard.

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Cisco Switching/Routing :: 6509 How Does Spanning-tree Operate

Mar 21, 2012

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Cisco Switching/Routing :: Logging Event Spanning-tree IOS 12.2(58)

Oct 20, 2011

i can't configure "logging event spanning-tree" on a specific port under IOS 12.2.(58) SE2 (all other "logging events" are possible),  under 12.2 (55) it is possible. Is it now a known bug or a default value?

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Cisco Switching/Routing :: 3750X Spanning Tree Priority

May 2, 2012

Recently we will add 2 new core Switch 3750X, these 2 equipments will manage the spanning tree ( root)my idea is to change the priority in order to make 1 or the 2 of them the root, my question is  if i setup the same priority for both when one go down the other will assume the role of root in the spanning tree topology ?

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