Switching STP using vIOS-L2

[medharrak]

I'm trying to configure STP using vIOS-L2 on GNS3, the loop works only with VLAN1 , for the other VLANs , All the switches display "This bridge is the root"

Any idea about the issue?

[Georg Pauwen]

Hello,

could be a bug in IOSv2. What exactly do you have configured, what does your topology look like ?

[medharrak]

Attached my topology:

4 Switches ,VLANs, VTP (All 4 switches are on Server mode), Trunk between switches , STP.

[paul driver]

Hello

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@medharrak wrote:

I'm trying to configure STP using vIOS-L2 on GNS3, the loop works only with VLAN1 , for the other VLANs , All the switches display "This bridge is the root"

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Make sure all vlans reside on each switch and are they able to traverse the trunks- Also manually set your primary switch to be the stp root
spanning-tree vlan 1-4094 priority 0

[medharrak]

VTP works as expected and propagate created VLAN on "DLS1" to all other Switches.
Also I did configure the DLS1 as root primary (spanning-tree vlan 100,200 root primary)
and "DLS2" as backup (spanning-tree 100,200 root secondary ).

[paul driver]

hello

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@medharrak wrote:

VTP works as expected and propagate created VLAN on "DLS1" to all other Switches.
Also I did configure the DLS1 as root primary (spanning-tree vlan 100,200 root primary)
and "DLS2" as backup (spanning-tree 100,200 root secondarI posted previoulsy y ).

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Specifying the stp root with the root primary/secondary macro won't preempt was if/when an additional switch comes on line with a much preferred bridge id a better way to be more deterministic about stp root placement would use a manual setting as I posted previously also given how flaky CML is it could be the stp root macro isnt work correctly so try/test that command instead.

[medharrak]

Hi,
I did change the default encapsulation on Uplinks from ISL to 802.1q and it worked just fine .I don't know why it wasn't working with ISL.

[medharrak]

I did change Cisco IOSvL2 to vios_l2-adventerprisek9-m.vmdk.SSA.152-4.0.55.E

and it's working fine.

there is a bug with the version vios_l2-adventerprisek9-m-15.2-2017032.qcow2