Channelizing interfaces on QFX5200

The 32 ports on Juniper QFX5200 can operate as 100G or 40G, based on the optic inserted in the port.

The 100G ports can work as 100G or they can be channelized to 50G or 25G.

The 40G ports can work as 40G or they can be channelized to 10G.

The 100G/40G appeat as et-fpc/pic/port and the channelized interfaces as et-fpc/pic/port:channel.

There is a 100G link between these two QFX5200:

{master:0}[edit]
root@jtac-QFX5200-32C-4# run show chassis hardware
Hardware inventory:
Item             Version  Part number  Serial number     Description
FPC 0                     650-059719   WH0216160014      QFX5200-32C-32Q
  CPU                     BUILTIN      BUILTIN           FPC CPU
  PIC 0                   BUILTIN      BUILTIN           32X40G/32X100G-QSFP
    Xcvr 2       EV01     740-061000   1PC4021064G       QSFP28-100G-CU1M

Without any configuration, the port operates at 100G:

{master:0}[edit]
root@jtac-QFX5200-32C-4# run show interfaces terse | match et-0/0/2
et-0/0/2                up    up
et-0/0/2.16386          up    up

{master:0}[edit]
root@jtac-QFX5200-32C-4# run show interfaces et-0/0/2
Physical interface: et-0/0/2, Enabled, Physical link is Up
  Interface index: 656, SNMP ifIndex: 515
  Link-level type: Ethernet, MTU: 1514, LAN-PHY mode, Speed: 100Gbps, BPDU Error: None, Loop Detect PDU Error: None, MAC-REWRITE Error: None, Loopback: Disabled, Source filtering: Disabled,
  Flow control: Disabled, Media type: Fiber

Let’s channelize this interface to 50G and confirm that each interface is 50G(the configuration is done on both QFX5200):

{master:0}[edit]
root@jtac-QFX5200-32C-4# show chassis
fpc 0 {
    pic 0 {
        port 2 {
            channel-speed 50g;
        }
    }
}

{master:0}[edit]
root@jtac-QFX5200-32C-4# run show interfaces terse | match et-0/0/2
et-0/0/2:0              up    up
et-0/0/2:1              up    up

{master:0}[edit]
root@jtac-QFX5200-32C-4# run show interfaces et-0/0/2:0
Physical interface: et-0/0/2:0, Enabled, Physical link is Up
  Interface index: 656, SNMP ifIndex: 522
  Link-level type: Ethernet, MTU: 1514, LAN-PHY mode, Speed: 50Gbps, BPDU Error: None, Loop Detect PDU Error: None, MAC-REWRITE Error: None, Loopback: Disabled, Source filtering: Disabled,
  Flow control: Disabled, Media type: Fiber

Now to 25G(notice that now we have 4 interfaces, 4 times 25G is 100G):

{master:0}[edit]
root@jtac-QFX5200-32C-4# show chassis
fpc 0 {
    pic 0 {
        port 2 {
            channel-speed 25g;
        }
    }
}

{master:0}[edit]
root@jtac-QFX5200-32C-4# run show interfaces terse | match et-0/0/2
et-0/0/2:0              up    up
et-0/0/2:1              up    up
et-0/0/2:2              up    up
et-0/0/2:3              up    up

{master:0}[edit]
root@jtac-QFX5200-32C-4# run show interfaces et-0/0/2:0
Physical interface: et-0/0/2:0, Enabled, Physical link is Up
  Interface index: 656, SNMP ifIndex: 522
  Link-level type: Ethernet, MTU: 1514, LAN-PHY mode, Speed: 25000mbps, BPDU Error: None, Loop Detect PDU Error: None, MAC-REWRITE Error: None, Loopback: Disabled, Source filtering: Disabled,
  Flow control: Disabled, Media type: Fiber

These channelized interfaces are standalone interfaces and you can work with them as they are separate interfaces.

Let’s configure OSPF for each of them:

{master:0}[edit]
root@jtac-QFX5200-32C-r1004# show interfaces
et-0/0/2:0 {
    unit 0 {
        family inet {
            address 1.1.0.4/24;
        }
    }
}
et-0/0/2:1 {
    unit 0 {
        family inet {
            address 1.1.1.4/24;
        }
    }
}
et-0/0/2:2 {
    unit 0 {
        family inet {
            address 1.1.2.4/24;
        }
    }
}
et-0/0/2:3 {
    unit 0 {
        family inet {
            address 1.1.3.4/24;
        }
    }
}

{master:0}[edit]
root@jtac-QFX5200-32C-r1004# show protocols ospf
area 0.0.0.0 {
    interface et-0/0/2:0.0;
    interface et-0/0/2:1.0;
    interface et-0/0/2:2.0;
    interface et-0/0/2:3.0;
}

{master:0}[edit]
root@jtac-QFX5200-32C-r1004#

You should have four neighbors:

{master:0}[edit]
root@jtac-QFX5200-32C-r1004# run show ospf neighbor
Address          Interface              State     ID               Pri  Dead
1.1.0.5          et-0/0/2:0.0           Full      1.1.0.5          128    39
1.1.1.5          et-0/0/2:1.0           Full      1.1.0.5          128    38
1.1.2.5          et-0/0/2:2.0           Full      1.1.0.5          128    37
1.1.3.5          et-0/0/2:3.0           Full      1.1.0.5          128    37

{master:0}[edit]
root@jtac-QFX5200-32C-r1004#

This applies to 40G interfaces, with the note that you can channelize to 10G(therefore 4 times 10G).

And this would be all about channelized interfaces on QFX5200 and Ihope you found this information useful.

 

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Paris ARAU

Paris ARAU is a networking professional with strong background on routing and switching technologies. He is a holder of CCIE R&S and dual JNCIE(SP and ENT). The day to day work allows him to dive deeply in networking technologies. Part of the continuously training, he is focusing on Software Defined Network and cloud computing.

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