Configuring and Verifying Unidirectional Links

This section contains two examples and commands that you can use to configure and verify unidirectional links:

Configuring and Verifying a Simple Example

To configure unidirectional link mode using default settings on 10-Gigabit Ethernet interface xe-5/1/0 and confirm the configuration:

[edit]interfaces xe-5/1/0 {unidirectional;}

[edit]user@host show interfacesxe-5/1/0 {unidirectional;}

The transmit-only and receive-only interfaces are created as soon as you commit the configuration. The following show command is one way to verify creation of these new interfaces:

user@host run show interfaces xe-5/1/0*
terse

Interface               Admin Link Proto    Local                 Remote
xe-5/1/0                up    down
xe-5/1/0-rx             up    down
xe-5/1/0-tx             up    up

The two unidirectional physical interfaces, xe-5/1/0-rx and xe-5/1/0-tx, are now present. In this example, no fiber-optic cables are connected to the port; consequently the xe-5/1/0 and xe-5/1/0-rx link states are down. In contrast, xe-5/1/0 is in the up state, because the transmit-only link is always up.

The following sample output provides more information about each of the interfaces. Unidirectional link mode has been enabled on xe-5/1/0, the transmit-only and receive-only interfaces are present, and the link state matches expectations for no fiber-optic cables connected to the physical port.

user@host run show interfaces xe-5/1/0*

Physical interface: xe-5/1/0, Enabled, Physical link is Down
  Interface index: 318, SNMP ifIndex: 118
  Link-level type: Ethernet, MTU: 1514, LAN-PHY mode, Speed: 10Gbps,
  Unidirectional: Enabled, Loopback: None, Source filtering: Disabled,
  Flow control: Enabled
  Device flags   : Present Running Down
  Interface flags: Hardware-Down SNMP-Traps Internal: 0x4000
  Link flags     : None
  CoS queues     : 8 supported, 8 maximum usable queues
  Current address: 00:05:85:75:8b:62, Hardware address: 00:05:85:75:8b:62
  Last flapped   : 2007-08-10 11:45:29 PDT (01:39:47 ago)
  Active alarms  : LINK
  Active defects : LINK
  PCS statistics                      Seconds
    Bit errors                             0
    Errored blocks                         0

Physical interface: xe-5/1/0-rx, Enabled, Physical link is Down
  Interface index: 153, SNMP ifIndex: 129
  Link-level type: Ethernet, MTU: 1514, LAN-PHY mode, Speed: 10Gbps,
  Unidirectional: Rx-Only
  Device flags   : Present Running Down
  Interface flags: Hardware-Down SNMP-Traps Internal: 0x4000
  Link flags     : None
  CoS queues     : 8 supported, 8 maximum usable queues
  Current address: 00:05:85:75:8b:62, Hardware address: 00:05:85:75:8b:62
  Last flapped   : 2007-08-10 11:46:29 PDT (01:38:47 ago)
  Input rate     : 0 bps (0 pps)
  Output rate    : 0 bps (0 pps)
  Active alarms  : LINK
  Active defects : LINK
  PCS statistics                      Seconds
    Bit errors                             0
    Errored blocks                         0

Physical interface: xe-5/1/0-tx, Enabled, Physical link is Up
  Interface index: 158, SNMP ifIndex: 130
  Link-level type: Ethernet, MTU: 1514, LAN-PHY mode, Speed: 10Gbps,
  Unidirectional: Tx-Only
  Device flags   : Present Running
  Interface flags: SNMP-Traps Internal: 0x4000
  Link flags     : None
  CoS queues     : 8 supported, 8 maximum usable queues
  Current address: 00:05:85:75:8b:62, Hardware address: 00:05:85:75:8b:62
  Last flapped   : 2007-08-10 11:46:29 PDT (01:38:47 ago)
  Input rate     : 0 bps (0 pps)
  Output rate    : 0 bps (0 pps)

Configuring and Verifying a More Complex Example

The following example makes the following changes from a default configuration:

Sets framing mode to WAN-PHY on the parent interface, and consequently on the unidirectional interfaces as well.
Configures VLAN IDs, VLAN tagging for single VLAN, and IP addresses on both unidirectional interfaces.
Sets a nondefault MAC address on the receive-only interface.
Configures a static ARP entry on the transmit-only interface. The entry contains a MAC address that is put into the Ethernet header destination address field of transmitted frames.

CLI Quick Configuration

To quickly configure the example described, copy the following commands and paste them into the router terminal window:

[edit]set interfaces xe-5/1/0 framing wan-physet interfaces xe-5/1/0 unidirectional set interfaces xe-5/1/0-rx mac 00:12:34:56:78:90 set interfaces xe-5/1/0-rx vlan-tagging unit 102 vlan-id 102 family inet address 10.1.102.2/24 set interfaces xe-5/1/0-tx vlan-tagging unit 201 vlan-id 201 family inet address 10.2.201.2/24 arp 10.2.201.3 mac 00:ab:cd:cd:ab:cdset routing-options static route 10.33.1.1/32 next-hop 10.2.201.3

Configuration Results

Display the results of the configuration:

[edit]user@host show interfacesxe-5/1/0-rx {vlan-tagging;mac 00:12:34:56:78:90;unit 102 {vlan-id 102;family inet {address 10.10.102.2/24;}}}xe-5/1/0-tx {vlan-tagging;unit 201 {vlan-id 201;family inet {address 10.2.201.2/24 {arp 10.2.201.3 mac 00:ab:cd:cd:ab:cd;}}}}xe-5/1/0 {framing {wan-phy;}unidirectional;}

Detailed Interface Information

To display terse details about the interfaces:

user@host run show interfaces xe-5/1/0*
terse

Interface               Admin Link Proto    Local                 Remote
xe-5/0/0                up    up
xe-5/0/0-rx             up    up
xe-5/0/0-rx.102         up    up   inet     1.1.102.2/24
                                   multiservice
xe-5/0/0-rx.32767       up    up   multiservice
xe-5/0/0-tx             up    up
xe-5/0/0-tx.201         up    up   inet     2.2.201.2/24
                                   multiservice
xe-5/0/0-tx.32767       up    up   multiservice

The additional logical interfaces for the unidirectional links result from the unit and VLAN tagging configuration.

To display more information about the interfaces:

user@host run show interfaces xe-5/1/0*

Physical interface: xe-5/1/0, Enabled, Physical link is Down
  Interface index: 151, SNMP ifIndex: 116
  Link-level type: Ethernet, MTU: 1514, Clocking: Internal, WAN-PHY mode, Speed: OC192, Unidirectional: Enabled, Loopback: None,
  Source filtering: Disabled, Flow control: Enabled
  Device flags   : Present Running Down
  Interface flags: Hardware-Down SNMP-Traps Internal: 0x4000
  Link flags     : None
  CoS queues     : 8 supported, 8 maximum usable queues
  Current address: 00:05:85:75:8b:39, Hardware address: 00:05:85:75:8b:39
  Last flapped   : 2007-08-10 08:50:40 PDT (00:05:00 ago)
  Active alarms  : LOF, LINK
  Active defects : LOF, SEF, AIS-L, AIS-P, LINK
  PCS statistics                      Seconds
    Bit errors                             0
    Errored blocks                         0

Physical interface: xe-5/1/0-rx, Enabled, Physical link is Down
  Interface index: 153, SNMP ifIndex: 114
  Link-level type: Ethernet, MTU: 1518, WAN-PHY mode, Speed: OC192, Unidirectional: Rx-Only
  Device flags   : Present Running Down
  Interface flags: Hardware-Down SNMP-Traps Internal: 0x4000
  Link flags     : None
  CoS queues     : 8 supported, 8 maximum usable queues
  Current address: 00:12:34:56:78:90, Hardware address: 00:05:85:75:8b:39
  Last flapped   : 2007-08-10 08:50:40 PDT (00:05:00 ago)
  Input rate     : 0 bps (0 pps)
  Output rate    : 0 bps (0 pps)
  Active alarms  : LOF, LINK
  Active defects : LOF, SEF, AIS-L, AIS-P, LINK
  PCS statistics                      Seconds
    Bit errors                             0
    Errored blocks                         0

  Logical interface xe-5/1/0-rx.102 (Index 70) (SNMP ifIndex 115) 
    Flags: Device-Down SNMP-Traps 0x4000 VLAN-Tag [ 0x8100.102 ]  Encapsulation: ENET2
    Input packets : 0 
    Output packets: 0
    Protocol inet, MTU: 1500
      Addresses, Flags: Dest-route-down Is-Preferred Is-Primary
        Destination: 10.1.102/24, Local: 10.1.102.2, Broadcast: 10.1.102.255
    Protocol multiservice, MTU: Unlimited
      Flags: None

  Logical interface xe-5/1/0-rx.32767 (Index 71) (SNMP ifIndex 124) 
    Flags: Device-Down SNMP-Traps 0x4000 VLAN-Tag [ 0x0000.0 ]  Encapsulation: ENET2
    Input packets : 0 
    Output packets: 0
    Protocol multiservice, MTU: Unlimited
      Flags: None

Physical interface: xe-5/1/0-tx, Enabled, Physical link is Up
  Interface index: 158, SNMP ifIndex: 125
  Link-level type: Ethernet, MTU: 1518, WAN-PHY mode, Speed: OC192, Unidirectional: Tx-Only
  Device flags   : Present Running
  Interface flags: SNMP-Traps Internal: 0x4000
  Link flags     : None
  CoS queues     : 8 supported, 8 maximum usable queues
  Current address: 00:05:85:75:8b:39, Hardware address: 00:05:85:75:8b:39
  Last flapped   : 2007-08-10 08:50:40 PDT (00:05:00 ago)
  Input rate     : 0 bps (0 pps)
  Output rate    : 0 bps (0 pps)

  Logical interface xe-5/1/0-tx.201 (Index 72) (SNMP ifIndex 126) 
    Flags: SNMP-Traps 0x4000 VLAN-Tag [ 0x8100.201 ]  Encapsulation: ENET2
    Input packets : 0 
    Output packets: 0
    Protocol inet, MTU: 1500
      Addresses, Flags: Is-Preferred Is-Primary
        Destination: 10.2.201/24, Local: 10.2.201.2, Broadcast: 10.2.201.255
    Protocol multiservice, MTU: Unlimited
      Flags: None

  Logical interface xe-5/1/0-tx.32767 (Index 73) (SNMP ifIndex 127) 
    Flags: SNMP-Traps 0x4000 VLAN-Tag [ 0x0000.0 ]  Encapsulation: ENET2
    Input packets : 0 
    Output packets: 0
    Protocol multiservice, MTU: Unlimited
      Flags: None

You can use the show interfaces xe-5/1/0* extensive command to display the most complete set of information about the interfaces. Alternatively, you can specify only xe-5/1/0, xe-5/1/0-rx, or xe-5/1/0-tx to show extensive information about just one interface.

The extensive output includes statistics for the interfaces. The following excerpts show the differences between the receive-only and transmit-only interfaces for statistics.

In the following output for a receive-only interface, input statistics are recorded, but all output statistics have a value of zero.

user@host show interfaces xe-7/0/0-rx
extensive

Physical interface: xe-7/0/0-rx, Enabled, Physical link is Up
  Interface index: 174, SNMP ifIndex: 118, Generation: 175
  Link-level type: Ethernet, MTU: 1514, LAN-PHY mode, Speed: 10Gbps, Unidirectional: Rx-Only
  Device flags   : Present Running
  Interface flags: SNMP-Traps Internal: 0x4000
  Link flags     : None
  CoS queues     : 8 supported, 8 maximum usable queues
  Hold-times     : Up 0 ms, Down 0 ms
  Current address: 00:05:85:73:e4:83, Hardware address: 00:05:85:73:e4:83
  Last flapped   : 2007-06-01 09:08:22 PDT (3d 02:31 ago)
  Statistics last cleared: Never
  Traffic statistics:
   Input  bytes  :      322857456303482           9627496104 bps
   Output bytes  :                    0                    0 bps
   Input  packets:         328775413751              1225495 pps
   Output packets:                    0                    0 pps

...

  Filter statistics:
    Input packet count            328775015056
    Input packet rejects                     1
    Input DA rejects                         0

...

  Logical interface xe-7/0/0-rx.0 (Index 72) (SNMP ifIndex 120) (Generation 138)
    Flags: SNMP-Traps Encapsulation: ENET2
    Traffic statistics:
     Input  bytes  :      322857456303482
     Output bytes  :                    0
     Input  packets:         328775413751
     Output packets:                    0

...

Transit statistics:
     Input  bytes  :      322857456303482           9627496104 bps
     Output bytes  :                    0                    0 bps
     Input  packets:         328775413751              1225495 pps
     Output packets:                    0                    0 pps

...

In the following output for a transmit-only interface, output statistics are recorded, but all input statistics have a value of zero.

user@host> show interfaces xe-7/0/0-tx extensive

Physical interface: xe-7/0/0-tx, Enabled, Physical link is Up
  Interface index: 176, SNMP ifIndex: 137, Generation: 177
  Link-level type: Ethernet, MTU: 1514, LAN-PHY mode, Speed: 10Gbps, Unidirectional: Tx-Only
  Device flags   : Present Running
  Interface flags: SNMP-Traps Internal: 0x4000
  Link flags     : None
  CoS queues     : 8 supported, 8 maximum usable queues
  Hold-times     : Up 0 ms, Down 0 ms
  Current address: 00:05:85:73:e4:83, Hardware address: 00:05:85:73:e4:83
  Last flapped   : 2007-06-01 09:08:19 PDT (3d 02:31 ago)
  Statistics last cleared: Never
  Traffic statistics:
   Input  bytes  :                    0                    0 bps
   Output bytes  :      322891152287160           9627472888 bps
   Input  packets:                    0                    0 pps
   Output packets:         328809727380              1225492 pps

...

  Filter statistics:
    Output packet count           328810554250
    Output packet pad count                  0
    Output packet error count                0

...

  Logical interface xe-7/0/0-tx.0 (Index 73) (SNMP ifIndex 138) (Generation 139)
    Flags: SNMP-Traps Encapsulation: ENET2
    Traffic statistics:
     Input  bytes  :                    0
     Output bytes  :      322891152287160
     Input  packets:                    0
     Output packets:         328809727380

...

Transit statistics:
     Input  bytes  :                    0                    0 bps
     Output bytes  :      322891152287160           9627472888 bps
     Input  packets:                    0                    0 pps
     Output packets:         328809727380              1225492 pps

...

Configuring and Verifying Unidirectional Links

Configuring and Verifying a Simple Example

Configuring and Verifying a More Complex Example

Related Topics