Route Maps on Native VLAN, can they impact trunks?

[archivalbackup]

Have a problem I am trying to figure out. I am having to pass traffic through a switch that I do not fully manage that has route maps applied on the native VLAN that is used for the trunk I connect over. I have done a lot of searching but could not come up with a definitive answer for my problem.

I have identified that I am loosing traffic that is going through this switch on a tagged VLAN that does not have any route maps or PBR applied. The only thing I can think of is that because the native VLAN on this switch has route maps applied that it is trying to apply to the traffic.

Wanted to know if anyone else had seen something like this happen before.


device----Switch 1 ------------------------ Switch 2 ---------------------- Switch 3----device

In this case I have full control over switch 1 & 3, with devices off of 1 and 3 that need to talk to each other on the same VLAN (which is trunked across switch 2). Switch 2 has a ton of route maps applied to it, including the VLAN used as the native vlan on the trunk (but no route maps on the VLAN the end devices are on). For example the devices off of 1&3 are on VLAN 600, and the native vlan between 1-2, and 2-3 is VLAN 1.

 

[MysticRyuujin]

Hard to understand. Configs would be way easier to understand.

Are the devices on access ports or are they on tagged/trunked ports? If they are access ports are they in VLAN 600 on your switch?

If you're passing VLAN 600 traffic over switch 2 as a trunk/tag then switch 2 has to have a VLAN 600 in its database and be sending it over...or are you passing VLAN 600 over switch 2 as the native untagged VLAN (VLAN 1)?

Is switch 2 doing QinQ for you?

Also, there are a ton of usages for Route Maps...without knowing what route-maps and how they are applied it's hard to say if they could be interfering with something. And when you say loosing traffic do you mean dropping packets or no packets at all?

 

[Pinski]

Route maps don't matter when it comes to doing Layer 2 to start.

Second, when you say traffic is being lost, how are you determining this? Have you checked bandwidth utilization? If this is pure Layer 2, then you've got an access port on VL600 on Switch 1, and Switch 3. And then in between 1->2 is a Trunk which has VL600 on it, and 2->3 is also a Trunk with VL600 on it.

If anything, it sounds like something is being overworked and causing all the problems.