Multiple VLAN trunking from 3750 or 2960G to an SLM2024
We have a pair of new SLM2024s we want to add into our topology. Our current core switch is a stacked 3750. We have a 2960G attached to that. Most things work, but we can't trunk multiple VLANs between the 2024s and the other units. I've tried on both the 2960G and the 3750.
On the 2024, there isn't much to configure. It just knows when a port needs to be in trunking mode. Just to be sure, I've set the connecting port to accept tagged traffic on the other VLANs I want it to accept, but no configuration I've set on the connecting ports for VLAN seems to make any difference.
When I tried on the 2960G, I only set the port with "switchport mode trunk", and "sh int trunk" shows its trunking all the VLANs.
When I tried on the 3750, I used the same as above, but added "switchport trunk encapsulation dot1q"
If I leave it like that, I can move traffic on and off the 2024 on VLAN 1 only. If I add a "switchport trunk native XX", then I can move traffic on that VLAN only. Assuming that the 2960G and 3750 are tagging all VLAN traffic not in native, then it seems that the 2024 is dropping all incoming tagged traffic, but accepting untagged traffic from the native VLAN of the connected switch.
The 2024s are communicating with each other on the various VLANs just fine.
Just so it's said, I'm not plugging the 2024 into the 2960G and the 3750 at the same time, nor am I plugging more than one 2024 directly into the rest of the network at any given time, although the pair have been connected to each other most of the time. I have tried breaking the link so that I've only got one 2024 in the mix, but that hasn't made any positive or negative differences at all.
Re: Multiple VLAN trunking from 3750 or 2960G to an SLM2024
Thanks for the suggestions, Jon.
The VLANs I'm currently trying to get to the 2024 are 10 and 100. So, I've set the connecting port to 1U/10T/100T. However, I can change anything I want on that, even excluding the VLANs, and it doesn't make any difference at all.
All PVID's on the 2024 are 1. I didn't see anything in the configs about changing the native VLAN for the 3750 or 2960G except on some ports and port-channels, so I assume that means they're still native in 1 (I'm not a Cisco guy, I inherited the 3750 and 2960G from a previous administration of whom no one is left).
This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
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