12-14-2011 02:56 AM
Dears,
Kindly advise difference between
1- uni port vs access port ?
2- nni port vs trunk port ?
Many Thanks
BR,
Sherif Ismail
12-14-2011 03:14 AM
Users from UNI to UNI cannot talk, its like Access with protected
UNI port will not run STP as well as CDP and LCP.
NNI and Trunk ports are almost similar.
12-14-2011 05:02 AM
Thanks Yasir for your assistance
Another question plz
So when to use NNI and when to use trunk ?
Many Thanks
Regards
Sherif Ismail
12-14-2011 05:14 AM
Hi Sherif,
Well, i think u took it in different way, NNI and UNI are Network Port Types, for Isolating purpose, and Access and Trunks are operational attributes.
UNI Cannot Talk with UNI Port --Either its Access or Trunk.
NNI can Talk with NNI and UNI port --> its similar like Private VLANS.
NNI port will always be your Trunk or uplink port, it can also be your access port as well.
In UNI port you will connect your customers, and most probably it will be Access port.
In NNI port you will connect your uplink, and most probably it will be your Trunk port or could be your access port.
As per official Doc:
Q. What is UNI/NNI?
12-14-2011 05:20 AM
Dear Yasir,
Many many thanks for your support today
12-21-2011 02:12 PM
Hi Sherif,
The choice of access vs. trunk port (on UNI's) is also dependent on the customers requirements and the type of ME service (EPL or EVPL) the customer will need.
This can also be tricky. Generally, if the customers CE's are routers, you can provide either an Access Port if the routers interface is a "routed port". Or if the customers CE has a trunk port (sub-interfaced), then you would need to provision a Trunk Port. Because both of these scenarios are "customer-facing" ports, and as above-mentioned by our colleague, they will almost always be UNI ports, not NNI ports. Customer-facing NNI's are generally used in managed-CE scenarios.
Cheers.
Sent from Cisco Technical Support iPad App
12-21-2011 10:54 PM
Thanks Hashiem
08-18-2020 07:48 PM
Just curious, are there any examples of a CE configuration where it connects to an NNI port but wants to sent trunks over that NNI port (ie, there are multiple destinations, say 600,601,602) but wants to send trunk information over the link and knows which place to place the trunks being sourced from the various UNIs (coming over the tagged packets)
??
Marcos
07-06-2018 12:51 PM
Great write-up! Saved me a lot of time!
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