Metro-Ethernet Switches Notes
ME Switches
– Metro Ethernet
– All ports are shutdown by default
-> Except uplink ports
– Ports
-> Downstream
-> Going towards the client
-> User Network Interface (UNI)
-> Upstream
-> Going towards SP core
-> Network Node Interface (NNI)
-> Downstream ports are isolated by default
-> Can’t communicate with each other
-> Downstream ports can communicate with upstream ports by default
UNI <–> NNI
UNI <-/-> UNI
On UNI ports, processing of these protocols is disabled
– STP
– CDP
– LLDP
If a client wants STP / CDP / LLDP / etherchannel to be activated on downstream ports, the ports must be changed
– Enhanced Network Interface (ENI)
No DTP
– Trunk and access are the only options
Only dot1q is supported
No VTP support
Default interface configuration is “static access”
To change the port type
int fa0/1
port-type { uni | eni | nni }
sh port-type
All VLANs on UNI ports are “uni-isolated” type
– To enable communication between UNI ports, change the VLAN type to “uni-community”
int range fa0/1 – 5
uni-vlan community
