loopspanning treeswitch
Please advise on the following question:
With 2 Cisco 2960G switches connected as in the diagram:
STP is not used.
How could the switches be configured in such a way that all the traffic HOST<->SERVER will go like HOST->SW1->SW2->SW1->SERVER as in the picture, but not HOST->SW1->SERVER.
Is there a way to block "internal" ports on SW1?
We had two switches.
[SW1]------10G------[SW2]
We upgraded SW1 with latest version and after upgrade UDLD failed between two switch.
We disabled UDLD on that port and everything was working file data was flowing on link both direction.
Later on SW2 upgrade switch with latest and greatest software fixed all issue and we re-enable UDLD and all good.
Do you have enough router ports available to do this ? You would still have your five trunks between the two buildings, but an outage on SW1 wouldn't bring down the whole LAN anymore.
You would need to finetune loadbalancing.
Ideally you could maybe add a second uplink from switches 1-5 to SW4, as well as from 6-10 to SW2. And maybe an extra portchannel between SW1-SW3 and SW2-SW4 :
Bottom line : with the same capacity between the two buildings, you only have one single point of (total) failure left : the router.
Best Answer
To meet this requirement, you can configure switch ports as protected ports (also referred to as private VLAN edge ports). Protected ports do not forward any traffic to protected ports on the same switch
so configure port attached to host and server as protected port. This means that all traffic passing between protected ports be forwarded through a Layer 3 device. so that justconfigure vlan 24 as a interface vlan on SW2NOTE Protected ports can forward any type of traffic to nonprotected ports, and they forward as usual to all ports on other switches. Dynamically learnt addresses are not retained if the switch is reloaded.