Routers / Switches :: RSTP Status Is Flapping With Broadcast Data?
Mar 16, 2011
RSTP port role in the switches are flapping if broadcast data is flowing through the ring. Also I've tried applying broadcast suppression to all the port to 64kbps for ports of 100Mbps/1Gbps, All the devices I'm using are L2 switches.
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Apr 26, 2011
how to check and trouble shot broadcast issues on network
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Aug 10, 2011
I'm using a Thomson Technicolor 587nV3. I need to change my NAT status from strict to open. So I can play MW3 online and connect to my friends online games and so I can host multiplayer matches. I have windows 7 laptop to do any of the steps required. I've tried to bind my routers cone through Winscript but without any luck perhaps I done it wrong
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Apr 2, 2013
I need to setup a layer 2 network consisting of 14 switches interconnected in a ring. Obviously, the design of 14 switches in a ring network is dumb, not here to debate that. Unfortunately, it HAS to be a ring. I've been researching the best way to configure RSTP for this. From everything I've read all I really need to do is configure Primary/Secondary root bridge in the center, and change the Maximum Age field to at least 16 seconds? From what I've read you want a minimum of 3 second buffer + 1 second for each hop due to message age being added by each switch hop?
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Jun 29, 2012
We have a quad port NIC on our Dell server.I want to take all 4 ports and plug it into our switch and have it all go to the same IP of the server and just have to share the data load in/out.Do I need to configure anything to do this?
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Mar 11, 2012
I have an issue with a Cisco 3750 switch stack which is connected to two seperate upstream Cisco 3750's which are administered by an ISP. The ISP is experiencing MAC address flapping from one of my VLAN SVI's i am using to route traffic upstream
[code]...
As you can see I utilise a VLAN SVI to route traffic to the upstream 1.1.1.2 (illustration only) IP. As per the diagram of the topology attached, the ISP is receiving a MAC address flapping error confirming the SVI MAC address from my switch stack is being learnt on the trunk port connecting switch 1 and switch 2, and also the port (Gi1/0/48) directly connected to my switch stack. As these are all Layer 2 links essentially being passed upstream and then connected between the two ISP switches, we have a 3 way triangular loop formed.
If I was to remove the port channel configuration from the two ports associated with the VLAN SVI, am i right in suggesting this would still form a layer 2 loop? The two ports would still be a member of the SVI VLAN, and it is the VLAN MAC address which is being learnt by the two ISP switches on different interfaces.
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Sep 12, 2012
So the SG300's have STP on them and prevent network loops when other switches on the network also support STP too. However, if someone plugs in a non-managed switch that doesn't support STP with a network loop, is there anything within the SG300 switches to isolate and/or prevent that from happening?
(I currently have port mirroring turned on for one port and a network sniffer attached awaiting the incident to happen again).
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Jun 7, 2012
I have a bunch of 3750x switches that each have a 10 gig routed link back to a central 4507 (loopback = 172.30.255.255).We carved up a /24 (of course, the /24 doesn't really exist except in our address tracking spreadsheet) into a bunch of /30's for routed WAN links and /32's for loopback addresses.We started on the low end for /30 subnets (ie 172.30.255.0/30, 172.30.255.4/30, etc.).We started at the high end for the /32 loopbacks (ie 172.30.255.255/32, 172.30.255.254/32, etc.)
Well, when I try pinging 172.30.255.255 from the access layer 3750x switches, the 3750x seems to be treating it as a broadcast ping where it lists each member that responds instead of the regular !!!!! response (this makes think something is odd with the 3750x). Of course, only one member responds (the core). But even the core seems to respond with the other end of the /30 instead of the actual /32 loopback (which makes me think something is odd in the core). I could have sworn that I've setup similar topologies without problems (ie, using 10.0.0.0/32, 10.255.255.255/32, etc as loopbacks) and as long as the mask is a /32, it should work.Also, I can ping/ssh to that loopback if my laptop is on a directly connected subnet. But I can't do it from any of the 3750x switches (which are also directly connected).I've double checked for overlapping subnets, but nope. I don't see any. Routing looks fine. The actual /32 is being propagated everywhere properly.
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Aug 1, 2011
model: SG300-52
version: 1.1.0.73
Switch is running in layer 3 mode.How can I turn off mDNS broadcast coming from the vlan interface on the switch.Getting mDNS broadcast from switch every 5 seconds.
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Dec 16, 2012
I have a 1 month old SG200-26P - the green status LED is blinking constantly (> 30 minutes), I cannot access the webGUI, nor is it responding to ping. I have tried resetting via holding reset for > 10 seconds with no effect, the status/activity LEDs are still illuminating against all connected ports, excluding any of the PoE ports which are running a couple of cisco IP phones. I've tried accessing the device via both the static IP I configured, and the default IP.
I have disconnected all ports, then powered on the device, but same results...Do I have a dead switch? Anything I can do other than return for warranty claim which is going to be last resort due holiday period and leaving the customer offline for extended period...
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Mar 18, 2009
I have a 1 month old SG200-26P - the green status LED is blinking constantly (> 30 minutes), I cannot access the webGUI, nor is it responding to ping. I have tried resetting via holding reset for > 10 seconds with no effect, the status/activity LEDs are still illuminating against all connected ports, excluding any of the PoE ports which are running a couple of cisco IP phones. I've tried accessing the device via both the static IP I configured, and the default IP.
I have disconnected all ports, then powered on the device, but same results...
Do I have a dead switch? Anything I can do other than return for warranty claim which is going to be last resort due holiday period and leaving the customer offline for extended period.
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Feb 22, 2013
I live in an area where there are lots of wireless modems and since most broadcast on the default frequencies, here is often interference. I'd like to set my AC900 to broadcast on a fixed channel that is not often used, e.g. 2 or 3 or 8.
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Feb 4, 2013
Some background information of my current configuration.
VLAN 100
-Computer A
interface gi1/1/1
[Code]....
From computer A, i had run command prompt and ping 192.168.2.100(computer B) and successfully get a response. I had repeated the step but ping to a broadcast address (192.168.255.255) and it was unsuccessful.
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Sep 22, 2011
I require a system that will support 3 VLANs, the VLANs are purely for containment of broadcast traffic and needs to support inter-VLAN communication between client devices. Would the following configuration work:
Port based VLAN on the SRP527W with each port connected to layer 2 switches serving each VLAN.
DHCP server on the SRP527W assigning IP addresses for each of the V LANS in different ranges. (eg 10.10.1.xx, 10.10.2.xx, 10.10.3.xx). Would there be any benefit upgrading the Router to a SRP547W?
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Dec 29, 2012
F9K117 - I can't see my broadcast ssid for the 5ghz band. Is there anything I can do?
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Jul 29, 2012
I recently bought an RVS4000, and unfortunately forget the "if it ain't broke, don't fix it" rule, and flashed it to the latest firmware (2.0.2.7). Subsequent to doing that, it has been inconveniently dropping the connection to my ISP and completely locking itself up to a point where a manual reboot is required, usually about 4 hours after any outgoing activity (which usually means 11pm!).
Goggling my way round seems to suggest that this could be a firmware problem. The accepted wisdom is that I need to use the RVS4000 Upgrade Utility to get back to a lower version, so I have downloaded and installed V1.3 from the RVS4000 support area. However, though I think I followed the instructions (including trying setting the host PC to a fixed IP address, which was not supposed to be necessary), but I am consistently getting a "Broadcast Error" message, which I am guessing means that the utility and the RVS4000 aren't talking.
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May 22, 2011
I would like to find out what the status is of the Cisco 7204 VXR and 7206 VXR routers?I understand they are EOLife and EOSale.Are they also EOSupport? we planning to upgrade 3 of them in our environment and management requires feedback around this.We thinking of going the ASR1000 route..
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Jan 13, 2013
I have two AC1200 routers? how do i connect one ac1200 to another ac1200. Only one should act as a DHCP server and broadcast wireless; the other should be simply just a hub (vs. me having to buy a separate hub). What are the correct settings and connections?
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Jun 28, 2012
Where is the disconect button on the VPN Status page gone in FW:1.01.26 (003) ? It used to be there as you can see in the below screen shots...
FW: 1.01.19(004)
FW: 1.01.26 (003)
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Dec 12, 2011
get a status on Mac Lion and/or Windows 7 64-bit SSL VPN support for the RV220W? QuickVPN (for Windows 7 64-bit users) and IPSecuritas (for Mac Lion users) are our current workarounds, but for folks that use/own their own equipment we prefer SSL VPN. This is why we retired our WRVS4400N v2 for the RV220W.
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Feb 15, 2012
I was wondering if anyone has seen their VPN User Connection Status Table empty even though you know for sure clients are connected? I connect with my iPhone to the PPTP VPN successfully and it works fine but there's no entry for the connection on the VPN User Connection Status Table. Is that normal? Does the router only collect data about Windows clients?
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Oct 12, 2011
Mgmt Vlan 1 (default) Data VLan 10 (with access to internet) Is there a way to have a PC attached to a SG300 switch such that it can both access Vlan 10 for data and Vlan 1 for managment ? The PC's port clearly needs to be untagged PVID on vlan 10. I have tried adding vlan 1T and setting the port as a trunk port but to no avail, The switch is currently level 2. I am guessing this might not be possible in level 2 without setting the mgmt vlan to 10 ?.
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May 3, 2012
I have problem with RVS4000 fw 1.3.3.5. When you switch the status of IPS function (turn on or turn off), firewall rules don´t work from that moment until you restart the router!
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Apr 12, 2012
I'm struggling with a configuration issue on the Cisco SG200-08P. We are using the Cisco SG200-08P on a mobile cart that will go from class room to class room that will have computer and cisco Voip phone plugged into it. The issue is that each of our closets are in differnt VLANS ( 1 voice and 1 data....lets say data vlan 20 and voice vlan 2025 for conversation) and that we route to each closet.It would be great if I could just create a generic data and voice vlan to dynamically pick up what the upstream switch has however, it seems that I've been unsuccessful in doing so. I can pass the data Vlan no probablem. The upstream switch port is set to access port and a switch port access voice vlan (these are 3750x switches) If the above is not possible I guess I will take what I can get. Should I just create data vlan 20 and voice vlan2025 on the Cisco SG200-08P and make a trunk port on the Cisco SG200-08P and a trunk on the 3750x? Is there an option on the Cisco SG200-08P to tag voice traffic?I'm also concerned with VTP and I did not see an area in the Cisco SG200-08P to set that as a client and transparent mode.
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Jan 23, 2013
Currently I'm with a pure Cisco shop, running every LAN Switched infrastructure (even in the HQ datacenter) with PVST+, I'm noticing in the documentation I've read and labs I've created that RSTP is... great, and I've observed that even the uplinkfast functionality seems to be build in by just enabling rapid-pvst. Of course I'll propose a migration plan, document the network, diagram it entirely and provide effective steps to implement the change, but that's assumed from any get'go.
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Feb 23, 2006
how to enable RSTP in the switch (Let's say in 2950 switch).
Or do you have RSTP running in now-a-days switches?
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Feb 15, 2012
I am having problem setting up SGE2000P switches to work with my default data VLAN and additional voice VLAN. I am configuring it to pick IP address for phones from voice VLAN which is working fine but when I connect a PC on phone port it is also picking up an IP from Voice VLAN while default VLAN is data with different scope of IP.
I pack these switches and purchase ESW 500 series. I have ESW 500 at another client and they are working fine out of the box but this guy is giving me hard time.
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Apr 24, 2013
i have some ME-3600x. some of version 12.2 and one of version 15.5. te last one hast same config as all other. but if i check for rstp it sends.i know abount global config commands:
-spanning-tree mode rapid-pvst
-spanning-tree extend system-id
but there is no spanning-tree support. this causes many more problems. so it is important to solve spanning tee at first.is it possible without downgrading this device?
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Apr 6, 2012
My entire switching network is enabled RSTP and I have purchased a new cisco 3560X series switch and I have not found RSTP feature in my switch.Is it available if I change the image? will cisco switches supports RSTP?
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Mar 20, 2012
I have a network with spanning-tree mode mst, but, we want change this for spanning-tree mode rstp. I have two cores(6500) and need know what is the better mode for change this with no impact in my network?
We dont have distributing layer, like a "topology" below.
ACCESS LAYER SWITCHES
|
|
---------------------------------
|CORE1 ------ CORE2 |
--------------------------------
|
|
SERVERS
CORE1 CONFIG
spanning-tree mode mst
no spanning-tree optimize bpdu transmission
spanning-tree extend system-id
spanning-tree uplinkfast
spanning-tree backbonefast(code)
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Oct 30, 2008
When I plug in a workstation to 3750 switch - it seems to take about 35 seconds before that workstation (hard coded IP) can ping the switch. You can see the console messages below. I configured RSTP and set this switch to root:
spanning-tree mode rapid-pvst
spanning-tree extend system-id
spanning-tree vlan 22,33,44 priority 8192
[Code].....
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Apr 8, 2013
I have a customer with several SG300's providing VLAN1 for data and VLAN10 for voice. The PC's are piggy backing off the phones and showing up in the SG300 fine:
One department has recently employed more people so we have an SG200 switch to connect the computers and phones to. I don't seem to be able to get any connectivity between the new switch and the SG300 it is connecting to. I have setup VLAN1 and 10 as per the images below:
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Nov 22, 2011
I have a 7609 with two LAG groups (Etherchannel not LACP) going to two separate devices that DO NOT participate in spanning-tree (Occam gear if you must know). I'm running 802.1w across the LAG groups but the convergence time is terrible! In essence, the 7609 is running spanning tree against itself (between the two blades). What can I do to fix my configuration?
If I disable the ports on the equipment connected to g1/17 & g1/18, it takes ~30 seconds for spanning tree to start forwarding on g2/17 & g2/18.When I bring the ports back up on the other side of g1/17 & g1/18 which are in a lag group, g2/17 & g2/18 immediately go into block mode while g1/17 & g1/18 start learning for another ~30 seconds!! [code]
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