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Questions tagged [spanning-tree]

55 questions
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Spanning-Tree and redundant links

I have 2 switches which have redundancy between them, meaning fa0/1 on SW1 is connected to fa0/1 on SW2, and fa0/2 on SW1 is connected to fa0/2 on SW2. Both of the switches have the same BID, however the MAC address of SW1 is numerically lower,…
Franko
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Spanning Tree Protocol (STP) to prevent network loop back issues?

I have several locations with managed network switches - for example, one being a stack of 3com 4500's. On occasion we have an issue where a user somewhere in the building decides to plug in their own consumer grade switch, which is fine until…
Scott Szretter
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Does native vlan tagging work with voice vlan?

we hard-code native vlan tagging: vlan dot1q tag native then we configure a port like this: interface FastEthernet0/1 switchport access vlan 20 switchport mode access switchport voice vlan 500 mls qos trust cos spanning-tree portfast Does this…
Majid Azimi
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Spanning Tree blocking DHCP requests in Windows/BOOTP

We have a LAN with 3 Cisco switches (SLM2048), a handful of Windows Servers and some WinXP/Win7PRO workstations. All devices are on the same LAN, no VLANs, nothing special configured on the switch (1LAG linking each switch). We recently purchased…
Molloch
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SSTP BPDU with bad TLV and macflap -- info please

I'm slowly locking down the network I've inherited and mac-flapping has been a problem in the past with customers doing all kinds of crazy things. Thats changing but I am now encountering this error: Dec 30 18:31:31 10.50.1.50 1565: 001567: Dec 30…
Adeodatus
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Spanning Tree required/desired for Port-Channel?

I have two Dell PowerConnect switches I want to connect together via Port-Channel links (2 ethernet links). Spanning tree is enabled on both switches, so therefore applied to all interfaces unless otherwise specified. Here is the configuration I…
dunxd
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Spanning tree causing packet loss between a Cisco switch C3560 and Linux server running on CentOs

I am working in a network environnement where I have some Cisco Switch WS-C3560X-48 and Linux Servers running CentOS 7.7. The linux servers are connected 3 times on my switches : one admin link, one production link and one ILO link because they are…
Doji
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Cisco spanning tree configuration

I need your support for my spanning tree configuration. I like to bridge my public network to a server and give him a public IP. I am using a virtual wire at the firewall to forward the public network. Later I connect the server to the vlan 123. I…
Timo
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MSTP: choice of MSTs and "freezing" an active topology

The scenario: A network topology consiting of a few layer 2 switches with some end devices on the edges. The pairs of end devices are in the same VLAN, a spanning tree protocol like MSTP created active topologies for each of the VLANs. Now the…
SiSc
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enabling Spanning-Tree or not

do you think is wise or stupid keeping the rapid spanning tree enabled for just two switches in this image? https://imgur.com/a/XI1NI As you can see the switches are not redundant each other but are connected simply because one has finished the…
butterfly77
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What routing/topology protocol(s) should be used with P2P devices with sporadic, changing connectivity?

I have several IoT devices that will sporadically come into and out of range, and connect in a partial mesh topology. For illustration purposes, imagine the interconnectivity of a Web of Trust, or Social Graph ... each has similar properties. What…
makerofthings7
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Does PVST allow to bridge two VLANs?

I am having a Switch Cisco IOS Software, C2960 Software (C2960-LANBASEK9-M), Version 12.2(50)SE4, RELEASE SOFTWARE (fc1) I have interface FastEthernet0/1 up to interface FastEthernet0/48 are configured as switchport access vlan , switchport mode…
Jimmy88
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Cisco spanning tree commands

I have been immersing myself in the Cisco STP documentation, but for the life of me I am not able to find anything relating to the toppology changes (aka ports logically going down) when certain commands are run. Due being un-familar with STP when I…
Graham
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Do you need STP on ProCurve trunks?

We have 3 switches - a Core Switch, and 2 downstream switches. Each downstream switch has a 3 cable Trunk direct to the core switch. However - when we disconnected one cable in that trunk group (still leaving 2 physical links in that trunk group…
PnP
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cascading load on connected Alcatel-Lucent OmniSwitch units via VLANs

We are having an intermittent issue with a campus of Alcatel-Lucent Omniswitch switches, ranging from model 6000 to 6850. We are having a problem tracking down the root cause of our issue. The seems to be some rogue traffic or something causing…
J. Chin
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