SVI - Inetrface Vlan is in Down Down State, can´t bring them up

[Ferdinand83]

Hi,

I configured Interface vlan 10 and Interface vlan20 on a layer 3 switch with the ip address and no shutdown command but they are in a down down state and can´t ping other vlan pc´s. the layer 2 switch is connected by a trunk to Layer 3 Switch, configured  all vlans 10 and 20 on layer 2 switch.

Can anyone help in bringing bring up the svi´s on L3 switch?

I´m attaching an image of the network example in packet tracer

[Richard Burts]

The outputs shown are from the dist1 (layer 3) switch. It might be helpful to see outputs from the connected layer 2 switch. In particular I would like to see the output of show interface trunk and of show interface status.

In general for an SVI there are 2 ways to get the SVI into an up/up state. Either the switch has an access port assigned to that vlan and with a connected device, or the switch has an active trunk that includes that vlan. Based on the very little information we have about this environment my guess at this point is that trunking is not really active between the layer 2 switch and the layer 3 switch.

[Martin L · Accepted solution]

Right, switch does internal checking before SVI can be brought as UP.  SVI can go down if : 1. you do not have that vlan in the database; check with show vlan brief and/or add vlan 10, 20.

2.  you don't have at least 1 active access port in vlan x is up up (with connected device),

3. switch has vlan x block over trunk, or vlan x is pruned from trunk link, (not allowed)

Note that PT does not support autostate command that would turn off that check for 3 items listed above. Real IOS do.

Regards, ML
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[Ferdinand83]

Hi,

The problem whas pretty simple, the vlans had not been created in L3 database switch

Vlan 10

Vlan20

Thanks so much

[Richard Burts]

Glad to know that you have figured out the issue and the solution for it. Thanks for sharing the solution with us.