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Cisco ME3400 UNI/NNI Port Types

Cisco ME 3400 series switches are designed to meet the needs of Metro service providers. Introduce brand new concept and features to make the product easier to manage, deploy, and troubleshoot. One of new features is the new concept of UNI/NNI Port Types.

  • UNI – User Network Interface
  • NNI – Network Node Interface

Based on the port type, certain features/behaviors are enabled or disabled to ease configuration, deployment, and troubleshooting.

UNI ports will not do local switching by default,  for example no local switching on UNI protects customers from each other ( host A dosn’t see host B ), and Control Plane Security  (CPS) is enabled, CPS protects against DoS attacks.

By default UNI ports:

  • not switching local traffic, for example no local switching on UNI protects customers from each other ( host A dosn’t see host B ).
  • Control Plane Security  (CPS) is enabled, CPS protects against DoS attacks.
  • using multiple UNI ports on the same ME 3400, up to 8 UNI ports can be configured to do local switching.

NNI ports:

  • For ME 3400-24TS, by default, the 2 SFP ports are NNI port-type
  • For ME 3400G-12CS and ME 3400G-2CS, by default, the SFP-only ports are NNI port-type
  • There can be a maximum of 4 ports defined as NNI ports (applicable to ME 3400-24TS and ME 3400G-12CS, all 4 ports can be configured as NNI on ME 3400G-2CS)

NOTE: In 12.2(25)SEG and later releases—Metro IP Access Image, all ports can be optionally configured as NNI (not limited to 4).

me3400

To configure port type:

me3400#conf t
me3400(config)#int gi0/10
me3400(config-if)#port-type ?
  nni  Set port-type to NNI
  uni  Set port-type to UNI

Configuring UNI ports to do local switching (forwarding traffic between UNI ports)

Port Fa0/3 and Fa0/4 on Cisco me3400 are UNI ports, belongs to VLAN 10, and Fa0/3 is not forwarding traffic to Fa0/4, and vice versa, but we wand to do local switching between them. Interface Fa0/1 is NNI. Configuration:

me3400(config)#vlan 10
me3400(config-vlan)#uni-vlan community

Configuration of ports:

interface FastEthernet0/3
 switchport trunk allowed vlan 10
 switchport mode trunk
!
interface FastEthernet0/4
 switchport access vlan 10
!

View VLAN configuration:

me3400-test#sh vlan

VLAN Name                             Status    Ports
---- -------------------------------- --------- -------------------------------
1    default                          active    Fa0/2, Fa0/5, Fa0/6, Fa0/7
                                                Fa0/8, Fa0/9, Fa0/10, Fa0/11
                                                Fa0/12, Fa0/13, Fa0/14, Fa0/15
                                                Fa0/16, Fa0/17, Fa0/18, Fa0/19
                                                Fa0/20, Fa0/21, Fa0/22, Fa0/23
                                                Fa0/24, Gi0/1, Gi0/2
10   test1                           active    Fa0/4
20   test                             active
1002 fddi-default                     act/unsup
1003 token-ring-default               act/unsup
1004 fddinet-default                  act/unsup
1005 trnet-default                    act/unsup

VLAN Type  SAID       MTU   Parent RingNo BridgeNo Stp  BrdgMode Trans1 Trans2
---- ----- ---------- ----- ------ ------ -------- ---- -------- ------ ------
1    enet  100001     1500  -      -      -        -    -        0      0
10   enet  100010     1500  -      -      -        -    -        0      0
20   enet  100020     1500  -      -      -        -    -        0      0
1002 fddi  101002     1500  -      -      -        -    -        0      0
1003 tr    101003     1500  -      -      -        -    -        0      0
1004 fdnet 101004     1500  -      -      -        ieee -        0      0
1005 trnet 101005     1500  -      -      -        ibm  -        0      0

Remote SPAN VLANs
------------------------------------------------------------------------------

Primary Secondary Type              Ports
------- --------- ----------------- ------------------------------------------

VLAN Type              Ports
---- ----------------- -------------------------------------------------------
10   UNI community     Fa0/1, Fa0/3, Fa0/4

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