davebuhl
asked on
Extend/mirror port on one switch to another switch - tunnel? bridge? passthrough?
I'm not sure the best terms to describe what I'm looking for. We have Cisco 3850s as our core switches, and 2960s in the IDFs. What I'm hoping to do is make port X on the 3850 switch, and port Y on one of the 2950s have an exclusive relationship where the traffic doesn't think it's "routed", but more like a passthrough.
We have a situation where we basically need to direct connect one device to another device with network cable, but they are way too far apart physically. So, if we can get the cisco switches to act as a bridge? tunnel? for the connection, where the two devices don't know that there is anything in between, that would fix the distance issue.
Does this type of setup exist on Cisco switches?
We have a situation where we basically need to direct connect one device to another device with network cable, but they are way too far apart physically. So, if we can get the cisco switches to act as a bridge? tunnel? for the connection, where the two devices don't know that there is anything in between, that would fix the distance issue.
Does this type of setup exist on Cisco switches?
ASKER
Thanks, but I'm not looking to pass VLAN traffic. This will not be traditional traffic. I'm 99.9% sure this traffic is non-routable. ip address, default gateway... not for this. That's why it would have to be dedicated port-for-port traffic mirroring. What goes into port X on the 3850, comes out of port Y on the 2960, and vice-versa.
The closest thing would be a SPAN port across switches, but I don't think that is exactly what I'm looking for.
The closest thing would be a SPAN port across switches, but I don't think that is exactly what I'm looking for.
What licenses do you have on the switches?
I would recommend Fallback Bridging if these devices are using non-IP based methods.
Out of curiosity, how far apart are the two devices?
I would recommend Fallback Bridging if these devices are using non-IP based methods.
Out of curiosity, how far apart are the two devices?
ASKER
After a quick look, fallback bridging does look promising. I'll have to investigate the licensing and configuration to see though.
I have 2-3 device pairs that I'm looking at. two of them would be 420 feet, possibly a little more depending on the cable path. The third would be 600+ feet.
I have 2-3 device pairs that I'm looking at. two of them would be 420 feet, possibly a little more depending on the cable path. The third would be 600+ feet.
If you don't need this to be in-band on your network and want to forgo the complexities of Fallback Bridging, purchase three inexpensive 8-port Ethernet hubs, install them in your IDFs and use them to bridge the connections.
Link to ethernet hubs via Google Shopping.
Link to ethernet hubs via Google Shopping.
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If these devices are tied to one another by MAC address, you will have to do MAC impersonation on both sides.
I am presuming your network looks like
2950 <----> 3850 <---> 2960
The ports both devices are connected to would need to be on a VLAN, the intermediate 3850s would need to have a trunked path between them for this VLAN and the upstream ports from the end switches would need to have this VLAN added to their upsteam trunk ports.
If you can attach SANITISED!!! copies of your switch configurations, that would be helpful.
NOTE: Attach them as files, not as text blocks in the message. Remove all password strings and sanitise IP information - consistently replace first and second octets with X.Y or X.W or X.Z or some combination thereof. Remove all company names or site names - replace site names and hostnames with generic information - CHI-IL-RTR-03 should become SITEA-RTR-03, etc.