Configuring Ethernet Interfaces

This module describes the configuration of Ethernet interfaces.

The following distributed ethernet architecture delivers network scalability and performance, while enabling service providers to offer high-density, high-bandwidth networking solutions.

  • 10-Gigabit

  • 40-Gigabit

  • 100-Gigabit


Tip

You can programmatically configure and manage the Ethernet interfaces using openconfig-ethernet-if.yang and openconfig-interfaces.yang OpenConfig data models. To get started with using data models, see the Programmability Configuration Guide for Cisco NCS 5500 Series Routers.

These solutions are designed to interconnect the router with other systems in point-of-presence (POP)s, including core and edge routers and Layer 2 and Layer 3 switches.

Restrictions

Router does not support configuration of the static mac address.

Configuring Gigabit Ethernet Interfaces

Restrictions and Important Guidelines

  • NC55-MPA-12T-S supports 1G optics in eight ports. The ports are 0 to 3 and 8 to 11.

  • NC55-MPA-12T-S supports 10G optics in ports 4 to 7.

Use this procedure to create a basic Ethernet interface configuration.

SUMMARY STEPS

  1. show version
  2. show interfaces [GigE | TenGigE | | | HundredGigE] interface-path-id
  3. configure
  4. interface [GigE | TenGigE| | | HundredGigE] interface-path-id
  5. ipv4 address ip-address mask
  6. mtu bytes
  7. no shutdown
  8. end or commit
  9. show interfaces [GigE TenGigE HundredGigE ] interface-path-id

DETAILED STEPS

Step 1

show version

Example:


RP/0/RP0/CPU0:router# show version

(Optional) Displays the current software version, and can also be used to confirm that the router recognizes the line card.

Step 2

show interfaces [GigE | TenGigE | | | HundredGigE] interface-path-id

Example:


RP/0/RP0/CPU0:router# show interface HundredGigE 0/1/0/1

(Optional) Displays the configured interface and checks the status of each interface port.

Step 3

configure

Example:


RP/0/RP0/CPU0:router# configure terminal

Enters global configuration mode.

Step 4

interface [GigE | TenGigE| | | HundredGigE] interface-path-id

Example:


RP/0/RP0/CPU0:router(config)# interface HundredGigE 0/1/0/1

Enters interface configuration mode and specifies the Ethernet interface name and notation rack/slot/module/port. Possible interface types for this procedure are:

  • GigE

  • 10GigE

  • 100GigE

    Note

     

    • The example indicates a 100-Gigabit Ethernet interface in the line card in slot 1.

Step 5

ipv4 address ip-address mask

Example:


RP/0/RP0/CPU0:router(config-if)# ipv4 address 172.18.189.38 255.255.255.224

Assigns an IP address and subnet mask to the interface.

  • Replace ip-address with the primary IPv4 address for the interface.

  • Replace mask with the mask for the associated IP subnet. The network mask can be specified in either of two ways:

  • The network mask can be a four-part dotted decimal address. For example, 255.0.0.0 indicates that each bit equal to 1 means that the corresponding address bit belongs to the network address.

  • The network mask can be indicated as a slash (/) and number. For example, /8 indicates that the first 8 bits of the mask are ones, and the corresponding bits of the address are network address.

Step 6

mtu bytes

Example:


RP/0/RP0/CPU0:router(config-if)# mtu 2000

(Optional) Sets the MTU value for the interface.

  • The configurable range for MTU values is 1514 bytes to 9646 bytes.

  • The default is 1514 bytes for normal frames and 1518 bytes for 802.1Q tagged frames.

Step 7

no shutdown

Example:


RP/0/RP0/CPU0:router(config-if)# no shutdown

Removes the shutdown configuration, which forces an interface administratively down.

Step 8

end or commit

Example:


RP/0/RP0/CPU0:router(config-if)# end

or 


RP/0/RP0/CPU0:router(config-if)# commit

Saves configuration changes.

  • When you issue the end command, the system prompts you to commit changes: 

    
Uncommitted changes found, commit them before exiting(yes/no/cancel)?
[cancel]:

  • Entering yes saves configuration changes to the running configuration file, exits the configuration session, and returns the router to EXEC mode.

  • Entering no exits the configuration session and returns the router to EXEC mode without committing the configuration changes.

  • Entering cancel leaves the router in the current configuration session without exiting or committing the configuration changes.

  • Use the commit command to save the configuration changes to the running configuration file and remain within the configuration session.

Step 9

show interfaces [GigE TenGigE HundredGigE ] interface-path-id

Example:


RP/0/RP0/CPU0:router# show interfaces HundredGigE 0/1/0/1

(Optional) Displays statistics for interfaces on the router.

Example

This example shows how to configure an interface for a 100-Gigabit Ethernet line card: 


RP/0/RP0/CPU0:router# configure 
RP/0/RP0/CPU0:router(config)# interface HundredGigE 0/1/0/1 
RP/0/RP0/CPU0:router(config-if)# ipv4 address 172.18.189.38 255.255.255.224 

RP/0/RP0/CPU0:router(config-if)# mtu 2000 

RP/0/RP0/CPU0:router(config-if)# no shutdown 
RP/0/RP0/CPU0:router(config-if)# end 
Uncommitted changes found, commit them? [yes]: yes 


RP/0/RP0/CPU0:router# show interfaces HundredGigE 0/5/0/24 
HundredGigE0/5/0/24 is up, line protocol is up
  Interface state transitions: 1
  Hardware is HundredGigE, address is 6219.8864.e330 (bia 6219.8864.e330)
  Internet address is 3.24.1.1/24
  MTU 9216 bytes, BW 100000000 Kbit (Max: 100000000 Kbit)
     reliability 255/255, txload 3/255, rxload 3/255
  Encapsulation ARPA,
  Full-duplex, 100000Mb/s, link type is force-up
  output flow control is off, input flow control is off
  Carrier delay (up) is 10 msec
  loopback not set,
  Last link flapped 10:05:07
  ARP type ARPA, ARP timeout 04:00:00
  Last input 00:08:56, output 00:00:00
  Last clearing of "show interface" counters never
  5 minute input rate 1258567000 bits/sec, 1484160 packets/sec
  5 minute output rate 1258584000 bits/sec, 1484160 packets/sec
     228290765840 packets input, 27293508436038 bytes, 0 total input drops
     0 drops for unrecognized upper-level protocol
     Received 15 broadcast packets, 45 multicast packets
              0 runts, 0 giants, 0 throttles, 0 parity
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
     212467849449 packets output, 25733664696650 bytes, 0 total output drops
     Output 23 broadcast packets, 15732 multicast packets
     39 output errors, 0 underruns, 0 applique, 0 resets
     0 output buffer failures, 0 output buffers swapped out
     0 carrier transitions

RP/0/RP0/CPU0:router# show running-config interface HundredGigE 0/5/0/24 

interface HundredGigE 0/5/0/24
 mtu 9216
 service-policy input linerate
 service-policy output elinerate
 ipv4 address 3.24.1.1 255.255.255.0
 ipv6 address 3:24:1::1/64
 flow ipv4 monitor perfv4 sampler fsm ingress
!

Information About Configuring Ethernet

This section provides the following information sections:

Default Configuration Values for 100-Gigabit Ethernet

This table describes the default interface configuration parameters that are present when an interface is enabled on a 100-Gigabit Ethernet line card.


Note

You must use the shutdown command to bring an interface administratively down. The interface default is no shutdown . When a line card is first inserted into the router, if there is no established preconfiguration for it, the configuration manager adds a shutdown item to its configuration. This shutdown can be removed only be entering the no shutdown command.

Table 1. 100-Gigabit Ethernet line card Default Configuration Values

Parameter

Configuration File Entry

Default Value

MTU

mtu

  • 1514 bytes for normal frames

  • 1518 bytes for 802.1Q tagged frames.

  • 1522 bytes for Q-in-Q frames.

MAC address

mac address

Hardware burned-in address (BIA)

Network Interface Speed

1Gig interfaces connected through copper or fiber cable can have interface speed of either 100 Mbps or 1000 Mbps. This is applicable on 1Gig interface with a 1000Base-T module (GLC-TE). By default 1G interface has following capabilities:

  • Speed—1000 Mbps for fiber cable and autonegotiate for copper cable

  • Duplex—Full

  • Pause—Receive Part (RX) and Transmit Part (TX)

The copper and fiber cables have same default values as mentioned above but autonegotiation is default for copper cable.

The speed can either configured or set to autonegotiate with remote end interface. When in autonegotiation mode, an interface is capable of negotiating the speed of 100 Mbps or 1000 Mbps depending on the speed at the remote end interface; and other parameters such as full duplex and pause are also autonegotiated.

Autonegotiation is an optional function of the Fast Ethernet standard that enables devices to automatically exchange information over a link about speed and duplex abilities. Autonegotiation is very useful for ports where devices with different capabilities are connected and disconnected on a regular basis.


Note

Autonegotiation is disabled by default, but it's mandatory on QSFP-100G-CUxM link. You must enable autonegotiation manually when you use 100GBASE-CR4 DAC cable.

Configuring Network Interface Speed

You can configure the network interface speed by using on of the following method:

  • Using the speed command

  • Using the negotiation auto command

  • Using both speed and negotiation auto command


Note

Cisco recommends to configure network interface speed in autonegotiation mode.

Using the speed command

When you configure the speed of the network interface (1G) using the speed command, the interface speed is forced to the configured speed by limiting the speed value of the auto negotiated parameter to the configured speed.

This sample configuration forces the Gig interface speed to 100Mbps.


Note

The interface speed at remote end is also set to 100Mbps.

 
#configuration
 (config)#interface GigabitEthernet 0/0/0/31
 (config-if)#speed 100
 (config-if)#commit
 (config-if)#end

Use the show controller GigE and show interface GigE commands to verify if the speed is configured to 100Mbps and autonegotiation is disabled: 

#show controllers GigabitEthernet 0/0/0/31
Operational data for interface GigabitEthernet0/0/0/31:
State:
    Administrative state: enabled
    Operational state: Up
    LED state: Green On
Phy:
    Media type: Four-pair Category 5 UTP PHY, full duplex
    Optics:
        Vendor: CISCO
        Part number: SBCU-5740ARZ-CS1
        Serial number: AVC194525HW
        Wavelength: 0 nm
    Digital Optical Monitoring:
        Transceiver Temp: 0.000 C
        Transceiver Voltage: 0.000 V

        Alarms key: (H) Alarm high, (h) Warning high
                    (L) Alarm low, (l) Warning low
           Wavelength    Tx Power          Rx Power      Laser Bias
        Lane  (nm)    (dBm)    (mW)     (dBm)     (mW)      (mA)
        --   -----   ------   ------    ------   ------    ------
        0     n/a     0.0   1.0000     0.0   1.0000     0.000 

        DOM alarms:
            No alarms

        Alarm                     Alarm    Warning   Warning    Alarm
        Thresholds                High      High       Low       Low
                                 -------   -------   -------   -------
        Transceiver Temp (C):      0.000     0.000     0.000     0.000
        Transceiver Voltage (V):   0.000     0.000     0.000     0.000
        Laser Bias (mA):           0.000     0.000     0.000     0.000
        Transmit Power (mW):       1.000     1.000     1.000     1.000
        Transmit Power (dBm):      0.000     0.000     0.000     0.000
        Receive Power (mW):        1.000     1.000     1.000     1.000
        Receive Power (dBm):       0.000     0.000     0.000     0.000
    Statistics:
        FEC:
            Corrected Codeword Count: 0
            Uncorrected Codeword Count: 0

MAC address information:
    Operational address: 0035.1a00.e67c
    Burnt-in address: 0035.1a00.e62c          
Autonegotiation disabled. 

Operational values:
    Speed: 100Mbps       /*Gig interface speed is set to 100Mbps */
    Duplex: Full Duplex
    Flowcontrol: None
    Loopback: None (or external)
    MTU: 1514
    MRU: 1514
    Forward error correction: Disabled



#show interfaces GigabitEthernet 0/0/0/31
GigabitEthernet0/0/0/31 is up, line protocol is up 
  Interface state transitions: 7
  Hardware is GigabitEthernet, address is 0035.1a00.e62c (bia 0035.1a00.e62c)
  Internet address is Unknown
  MTU 1514 bytes, BW 100000 Kbit (Max: 100000 Kbit)
     reliability 255/255, txload 0/255, rxload 0/255
  Encapsulation ARPA,
  Full-duplex, 100Mb/s, TFD, link type is force-up
  output flow control is off, input flow control is off
  Carrier delay (up) is 10 msec
  loopback not set,
  Last link flapped 00:00:30
  Last input 00:00:00, output 00:00:00
  Last clearing of "show interface" counters never
  30 second input rate 1000 bits/sec, 1 packets/sec
  30 second output rate 0 bits/sec, 1 packets/sec
     90943 packets input, 11680016 bytes, 0 total input drops
     0 drops for unrecognized upper-level protocol
     Received 0 broadcast packets, 90943 multicast packets
              0 runts, 0 giants, 0 throttles, 0 parity
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
     61279 packets output, 4347618 bytes, 0 total output drops
     Output 0 broadcast packets, 8656 multicast packets
     0 output errors, 0 underruns, 0 applique, 0 resets
     0 output buffer failures, 0 output buffers swapped out
8	carrier transitions

In the above show output you will observe that the state of the GigabitEthernet0/0/0/31 is up, and line protocol is up. This is because the speed at both ends is 100Mbps.

Using the negotiation auto command

When you configure the network interface speed using negotiation auto command, the speed is autonegotiated with the remote end interface. This command enhances the speed capability to 100M or 1G to be negotiated with the peer.

This sample configuration sets the interface speed to autonegotiate:


Note

The interface speed at remote end is set to 100Mbps.

Note

Prior to Cisco IOS XR Software Release 7.3.2, the default setting for auto-negotiation varied with different platforms under the NCS 5500 family. On NCS 540 and NCS 55A2, 100G auto-negotiation was enabled by default.

From Cisco IOS XR Software Release 7.3.2 onwards, auto-negotiation is not enabled by default. Use the negotiation auto command to enable auto-negotiation. 

#configuration                              
 (config)#interface GigabitEthernet 0/0/0/31
 (config-if)#negotiation auto 
 (config-if)#commit
 (config-if)#end

Use the show controller GigE and show interface GigE commands to verify if the speed is autonegotiated: 

#show interfaces GigabitEthernet 0/0/0/31 
GigabitEthernet0/0/0/31 is up, line protocol is up 
  Interface state transitions: 10
  Hardware is GigabitEthernet, address is 0035.1a00.e62c (bia 0035.1a00.e62c)
  Internet address is Unknown
  MTU 1514 bytes, BW 100000 Kbit (Max: 100000 Kbit)
     reliability 255/255, txload 0/255, rxload 0/255
  Encapsulation ARPA,
  Full-duplex, 100Mb/s, TFD, link type is autonegotiation
  output flow control is off, input flow control is off
  Carrier delay (up) is 10 msec
  loopback not set,
  Last link flapped 00:00:01
  Last input 00:00:00, output 00:00:00
  Last clearing of "show interface" counters never
  30 second input rate 1000 bits/sec, 1 packets/sec
  30 second output rate 0 bits/sec, 0 packets/sec
     91005 packets input, 11687850 bytes, 0 total input drops
     0 drops for unrecognized upper-level protocol
     Received 0 broadcast packets, 91005 multicast packets
              0 runts, 0 giants, 0 throttles, 0 parity
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
     61307 packets output, 4350024 bytes, 0 total output drops
     Output 0 broadcast packets, 8668 multicast packets
     0 output errors, 0 underruns, 0 applique, 0 resets
     0 output buffer failures, 0 output buffers swapped out
     15 carrier transitions

In the above show output you see that GigabitEthernet0/0/0/31 is up, and line protocol is up. 

 #show controllers GigabitEthernet 0/0/0/31
Operational data for interface GigabitEthernet0/0/0/31:

State:
    Administrative state: enabled
    Operational state: Up
    LED state: Green On

Phy:
    Media type: Four-pair Category 5 UTP PHY, full duplex
    Optics:
        Vendor: CISCO
        Part number: SBCU-5740ARZ-CS1
        Serial number: AVC194525HW
        Wavelength: 0 nm
    Digital Optical Monitoring:
        Transceiver Temp: 0.000 C
        Transceiver Voltage: 0.000 V

        Alarms key: (H) Alarm high, (h) Warning high
                    (L) Alarm low, (l) Warning low
           Wavelength    Tx Power          Rx Power      Laser Bias
        Lane  (nm)    (dBm)    (mW)     (dBm)     (mW)      (mA)
        --   -----   ------   ------    ------   ------    ------
        0     n/a     0.0   1.0000     0.0   1.0000     0.000 

        DOM alarms:
            No alarms

        Alarm                     Alarm    Warning   Warning    Alarm
        Thresholds                High      High       Low       Low
                                 -------   -------   -------   -------
        Transceiver Temp (C):      0.000     0.000     0.000     0.000
        Transceiver Voltage (V):   0.000     0.000     0.000     0.000
        Laser Bias (mA):           0.000     0.000     0.000     0.000
        Transmit Power (mW):       1.000     1.000     1.000     1.000
        Transmit Power (dBm):      0.000     0.000     0.000     0.000
        Receive Power (mW):        1.000     1.000     1.000     1.000
        Receive Power (dBm):       0.000     0.000     0.000     0.000
    Statistics:
        FEC:
            Corrected Codeword Count: 0
            Uncorrected Codeword Count: 0

MAC address information:
    Operational address: 0035.1a00.e67c
    Burnt-in address: 0035.1a00.e62c
          
Autonegotiation enabled:
    No restricted parameters

Operational values:
    Speed: 100Mbps
    Duplex: Full Duplex
    Flowcontrol: None
    Loopback: None (or external)
    MTU: 1514
    MRU: 1514
    Forward error correction: Disabled

Using speed and negotiation auto command

When you configure the speed of the network interface (1G) using the speed and negotiation auto command, the interface autonegotiates all the paramets (full-duplex and pause) except speed. The speed is forced to the configured value.

This sample shows how to configures Gig interface speed to 100Mbps and autonegotiate other parameters:


Note

The interface speed at remote end is set to 100Mbps.

 
 #configuration                              
 (config)#interface GigabitEthernet 0/0/0/31
 (config-if)#negotiation auto 
 (config-if)#speed 100
 (config-if)#end

Use the show controller GigE and show interface GigE command to verify if the link is up, speed is forced to 100Mbps and autonegotiation is enabled: 

#show interfaces GigabitEthernet 0/0/0/31
GigabitEthernet0/0/0/31 is up, line protocol is up 
  Interface state transitions: 9
  Hardware is GigabitEthernet, address is 0035.1a00.e62c (bia 0035.1a00.e62c)
  Internet address is Unknown
  MTU 1514 bytes, BW 100000 Kbit (Max: 100000 Kbit)
     reliability 255/255, txload 0/255, rxload 0/255
  Encapsulation ARPA,
  Full-duplex, 100Mb/s, TFD, link type is autonegotiation
  output flow control is off, input flow control is off
  Carrier delay (up) is 10 msec
  loopback not set,
  Last link flapped 00:00:03
  Last input 00:00:00, output 00:00:00
  Last clearing of "show interface" counters never
  30 second input rate 0 bits/sec, 1 packets/sec
  30 second output rate 0 bits/sec, 0 packets/sec
     90968 packets input, 11683189 bytes, 0 total input drops
     0 drops for unrecognized upper-level protocol
     Received 0 broadcast packets, 90968 multicast packets
              0 runts, 0 giants, 0 throttles, 0 parity
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
     61287 packets output, 4348541 bytes, 0 total output drops
     Output 0 broadcast packets, 8664 multicast packets
     0 output errors, 0 underruns, 0 applique, 0 resets
     0 output buffer failures, 0 output buffers swapped out
     12 carrier transitions

In the above show output you will observe that the GigabitEthernet0/0/0/31 is up, and line protocol is up This is because the speed at both ends is 100Mbps. 

#show controllers GigabitEthernet 0/0/0/31
Operational data for interface GigabitEthernet0/0/0/31:

State:
    Administrative state: enabled
    Operational state: Up
    LED state: Green On

Phy:
    Media type: Four-pair Category 5 UTP PHY, full duplex
    Optics:
        Vendor: CISCO
        Part number: SBCU-5740ARZ-CS1
        Serial number: AVC194525HW
        Wavelength: 0 nm
    Digital Optical Monitoring:
        Transceiver Temp: 0.000 C
        Transceiver Voltage: 0.000 V

        Alarms key: (H) Alarm high, (h) Warning high
                    (L) Alarm low, (l) Warning low
           Wavelength    Tx Power          Rx Power      Laser Bias
        Lane  (nm)    (dBm)    (mW)     (dBm)     (mW)      (mA)
        --   -----   ------   ------    ------   ------    ------
        0     n/a     0.0   1.0000     0.0   1.0000     0.000 

        DOM alarms:
            No alarms

        Alarm                     Alarm    Warning   Warning    Alarm
        Thresholds                High      High       Low       Low
                                 -------   -------   -------   -------
        Transceiver Temp (C):      0.000     0.000     0.000     0.000
        Transceiver Voltage (V):   0.000     0.000     0.000     0.000
        Laser Bias (mA):           0.000     0.000     0.000     0.000
        Transmit Power (mW):       1.000     1.000     1.000     1.000
        Transmit Power (dBm):      0.000     0.000     0.000     0.000
        Receive Power (mW):        1.000     1.000     1.000     1.000
        Receive Power (dBm):       0.000     0.000     0.000     0.000
    Statistics:
        FEC:
            Corrected Codeword Count: 0
            Uncorrected Codeword Count: 0

MAC address information:
    Operational address: 0035.1a00.e67c
    Burnt-in address: 0035.1a00.e62c
          
Autonegotiation enabled:
    Speed restricted to: 100Mbps  /* autonegotiation is enabled and speed is forced to 100Mbps*/

Operational values:
    Speed: 100Mbps
    Duplex: Full Duplex
    Flowcontrol: None
    Loopback: None (or external)
    MTU: 1514
    MRU: 1514
    Forward error correction: Disabled

Ethernet MTU

The Ethernet maximum transmission unit (MTU) is the size of the largest frame, minus the 4-byte frame check sequence (FCS), that can be transmitted on the Ethernet network. Every physical network along the destination of a packet can have a different MTU.

Cisco IOS XR software supports two types of frame forwarding processes:

  • Fragmentation for IPV4 packets–In this process, IPv4 packets are fragmented as necessary to fit within the MTU of the next-hop physical network.


    Note

    IPv6 does not support fragmentation.

  • MTU discovery process determines largest packet size–This process is available for all IPV6 devices, and for originating IPv4 devices. In this process, the originating IP device determines the size of the largest IPv6 or IPV4 packet that can be sent without being fragmented. The largest packet is equal to the smallest MTU of any network between the IP source and the IP destination devices. If a packet is larger than the smallest MTU of all the networks in its path, that packet will be fragmented as necessary. This process ensures that the originating device does not send an IP packet that is too large.

Jumbo frame support is automatically enable for frames that exceed the standard frame size. The default value is 1514 for standard frames and 1518 for 802.1Q tagged frames. These numbers exclude the 4-byte frame check sequence (FCS).

Following are the supported MTU properties on devices containing NC55 first generation line cards, NCS 5501, NCS5501-SE cards:

  • Each physical port can have a different MTU.

  • Main interface of each bundle can have one MTU value.

  • L3 sub-interface (bundle or physical) shares MTU profiles and can have a maximum of 3 unique configured MTUs per NPU.


    Note

    L2 sub-interface MTU is not supported.

For more information about the architecture, refer to the NCS 5500 and NCS 5700 Fixed Platform Architecture white paper.

Link Layer Discovery Protocol (LLDP)

Cisco Discovery Protocol (CDP) is a device discovery protocol that runs over Layer 2. Layer 2 is also known as the data link layer that runs on all Cisco-manufactured devices, such as routers, bridges, access servers, and switches. CDP allows the network management applications to automatically discover and learn about other Cisco devices that connect to the network.

To support non-Cisco devices and to allow for interoperability between other devices, it also supports the IEEE 802.1AB LLDP. LLDP is also a neighbor discovery protocol that is used for network devices to advertise information about themselves to other devices on the network. This protocol runs over the data link layer, which allows two systems running different network layer protocols to learn about each other.

With LLDP, you can also access the information about a particular physical network connection. If you use a non-Cisco monitoring tool (via SNMP,) LLDP helps you identify the Object Identifiers (OIDs) that the system supports. The following are the supported OIDs:

  • 1.0.8802.1.1.2.1.4.1.1.4

  • 1.0.8802.1.1.2.1.4.1.1.5

  • 1.0.8802.1.1.2.1.4.1.1.6

  • 1.0.8802.1.1.2.1.4.1.1.7

  • 1.0.8802.1.1.2.1.4.1.1.8

  • 1.0.8802.1.1.2.1.4.1.1.9

  • 1.0.8802.1.1.2.1.4.1.1.10

  • 1.0.8802.1.1.2.1.4.1.1.11

  • 1.0.8802.1.1.2.1.4.1.1.12

Enabling LLDP Globally

To run LLDP on the router, you must enable it globally. When you enable LLDP globally, all interfaces that support LLDP are automatically enabled for both transmit and receive operations.

You can override this default operation at the interface to disable receive or transmit operations.

The following table describes the global attributes that you can configure:

Attribute Default Range Description
Holdtime 120 0-65535 Specifies the holdtime (in sec) that are sent in packets
Reinit 2 2-5 Delay (in sec) for LLDP initialization on any interface
Timer 30 5-65534 Specifies the rate at which LLDP packets are sent (in sec)

To enable LLDP globally, complete the following steps:

  1. RP/0/RSP0/CPU0:router # configure

  2. RP/0/RSP0/CPU0:router(config) #lldp

  3. end or commit

Running configuration

RP/0/RP0/CPU0:router-5#show run lldp
Fri Dec 15 20:36:49.132 UTC
lldp
!

RP/0/RP0/CPU0:router#show lldp neighbors
Fri Dec 15 20:29:53.763 UTC
Capability codes:
        (R) Router, (B) Bridge, (T) Telephone, (C) DOCSIS Cable Device
        (W) WLAN Access Point, (P) Repeater, (S) Station, (O) Other

Device ID       Local Intf          Hold-time  Capability     Port ID
SW-NOSTG-I11-PUB.cis Mg0/RP0/CPU0/0      120        N/A             Fa0/28

Total entries displayed: 1

RP/0/RP0/CPU0:router#show lldp neighbors mgmtEth 0/RP0/CPU0/0
Fri Dec 15 20:30:54.736 UTC
Capability codes:
        (R) Router, (B) Bridge, (T) Telephone, (C) DOCSIS Cable Device
        (W) WLAN Access Point, (P) Repeater, (S) Station, (O) Other

Device ID       Local Intf          Hold-time  Capability     Port ID
SW-NOSTG-I11-PUB.cis Mg0/RP0/CPU0/0      120        N/A             Fa0/28

Total entries displayed: 1

Enabling LLDP Per Interface

When you enable LLDP globally, all interfaces that support LLDP are automatically enabled for both transmit and receive operations. However, if you want to enable LLDP per interface, perform the following configuration steps:

  1. RP/0/RSP0/CPU0:router(config)# int gigabitEthernet 0/2/0/0

  2. RP/0/RSP0/CPU0:router(config-if)# no sh

  3. RP/0/RSP0/CPU0:router(config-if)#commit

  4. RP/0/RSP0/CPU0:router(config-if)#lldp ?

  5. RP/0/RSP0/CPU0:router(config-if)#lldp enable

  6. RP/0/RSP0/CPU0:router(config-if)#commit

Running configuration

RP/0/RSP0/CPU0:router#sh running-config  
Wed Jun 27 12:40:21.274 IST
Building configuration...
!! IOS XR Configuration 0.0.0
!! Last configuration change at Wed Jun 27 00:59:29 2018 by UNKNOWN
!
interface GigabitEthernet0/1/0/0
 shutdown
!
interface GigabitEthernet0/1/0/1
 shutdown
!
interface GigabitEthernet0/1/0/2
 shutdown
!
interface GigabitEthernet0/2/0/0
 Shutdown
!
interface GigabitEthernet0/2/0/1
 shutdown
!
interface GigabitEthernet0/2/0/2
 shutdown
!
end

Verification

Verifying the config
==================
RP/0/RSP0/CPU0:router#sh lldp interface <===== LLDP enabled only on GigEth0/2/0/0
Wed Jun 27 12:43:26.252 IST


GigabitEthernet0/2/0/0:
        Tx: enabled
        Rx: enabled
        Tx state: IDLE
        Rx state: WAIT FOR FRAME
RP/0/RSP0/CPU0:router# 

RP/0/RSP0/CPU0:router# show lldp neighbors 
Wed Jun 27 12:44:38.977 IST
Capability codes:
        (R) Router, (B) Bridge, (T) Telephone, (C) DOCSIS Cable Device
        (W) WLAN Access Point, (P) Repeater, (S) Station, (O) Other

Device ID       Local Intf          Hold-time  Capability     Port ID
ios             Gi0/2/0/0           120        R               Gi0/2/0/0       <====== LLDP enabled only on GigEth0/2/0/0 and neighborship seen for the same.

Total entries displayed: 1

RP/0/RSP0/CPU0:router#

Dense Wavelength Division Multiplexing Tunable Optics

The Dense Wavelength-Division Multiplexing (DWDM) wavelengths of the DWDM-SFP10G-C module on the Cisco NCS 5500 Series Aggregation Services Routers is tunable. You can configure the DWDM ITU wavelengths by using the itu channel command in the interface configuration mode. The itu channel command ensures that the traffic continues to flow.

The following table contains the wavelength mapping information for the DWDM module:

Channel Frequency (THz) Wavelength (nm)
1

191.35

1566.723
2

191.40

1566.314
3

191.45

1565.905
4

191.50

1565.496
5

191.55

1565.087
6

191.60

1564.679
7

191.65

1564.271
8

191.70

1563.863
9

191.75

1563.455
10

191.80

1563.047
11

191.85

1562.640
12

191.90

1562.233
13

191.95

1561.826
14

192.00

1561.419
15

192.05

1561.013
16

192.10

1560.606
17

192.15

1560.200
18

192.20

1559.794
19

192.25

1559.389
20

192.30

1558.983
21

192.35

1558.578
22

192.40

1558.173
23

192.45

1557.768
24

192.50

1557.363
25

192.55

1556.959
26

192.60

1556.555
27

192.65

1556.151
28

192.70

1555.747
29

192.75

1555.343
30

192.80

1554.940
31

192.85

1554.537
32

192.90

1554.134
33

192.95

1553.731
34

193.00

1553.329
35

193.05

1552.926
36

193.10

1552.524
37

193.15

1552.122
38

193.20

1551.721
39

193.25

1551.319
40

193.30

1550.918
41

193.35

1550.517
42

193.40

1550.116
43

193.45

1549.715
44

193.50

1549.315
45

193.55

1548.915
46

193.60

1548.515
47

193.65

1548.115
48

193.70

1547.715
49

193.75

1547.316
50

193.80

1546.917
51

193.85

1546.518
52

193.90

1546.119
53

193.95

1545.720
54

194.00

1545.322
55

194.05

1544.924
56

194.10

1544.526
57

194.15

1544.128
58

194.20

1543.730
59

194.25

1543.333
60

194.30

1542.936
61

194.35

1542.539
62

194.40

1542.142
63

194.45

1541.746
64

194.50

1541.349
65

194.55

1540.953
66

194.60

1540.557
67

194.65

1540.162
68

194.70

1539.766
69

194.75

1539.371
70

194.80

1538.976
71

194.85

1538.581
72

194.90

1538.186
73

194.95

1537.792
74

195.00

1537.397
75

195.05

1537.003
76

195.10

1536.609
77

195.15

1536.216
78

195.20

1535.822
79

195.25

1535.429
80

195.30

1535.036
81

195.35

1534.643
82

195.40

1534.250
83

195.45

1533.858
84

195.50

1533.465
85

195.55

1533.073
86

195.60

1532.681
87

195.65

1532.290
88

195.70

1531.898
89

195.75

1531.507
90

195.80

1531.116
91

195.85

1530.725
92

195.90

1530.334
93

195.95

1529.944
94

196.00

1529.553
95

196.05

1529.163

96

196.10

1528.773

Note

For more information on limitations of this feature and details about optical parameters, see https://www.cisco.com/c/en/us/products/collateral/interfaces-modules/dwdm-transceiver-modules/data_sheet_c78-711186.html.

Configuring the DWDM Tunable Optics

Perform the following procedure to configure the DWDM Tunable Optics module:

  1. Router# enable //Enables the privileged EXEC mode. If prompted, enter your password.

  2. Router# configure terminal

  3. Router(config)# interface tengigabitethernet 4/11 // Specifies the 10-Gigabit Ethernet interface to be configured. slot/port—Specifies the location of the interface.

  4. Router(config-if)# itu channel 28 //Sets the ITU channel. number specifies the ITU channel number. The acceptable values are from 1–96.

Verifying the ITU Configuration

The following example shows how to use the show controller optics command to check an ITU configuration:
RP/0/RP0/CPU0:ios#show controllers optics 0/0/0/16
Tue Sep  5 08:25:54.127 UTC

 Controller State: Up 

 Transport Admin State: In Service 

 Laser State: Off 

 LED State: Off 
 
 Optics Status 

         Optics Type:  SFP+ 10G DWDM Tunable
         DWDM carrier Info: C BAND, MSA ITU Channel=49, Frequency=193.75THz,
         Wavelength=1547.316nm 

         Alarm Status:
         -------------
         Detected Alarms: 
                 LOW-RX0-PWR   

         LOS/LOL/Fault Status:

         Laser Bias Current = 0.0 mA
         Actual TX Power = 0.00 dBm 
         RX Power = 0.00 dBm 

         Performance Monitoring: Enable 

         THRESHOLD VALUES
         ----------------

         Parameter                 High Alarm  Low Alarm  High Warning  Low Warning
         ------------------------  ----------  ---------  ------------  -----------
         Rx Power Threshold(dBm)         -2.9      -30.9          -7.0        -26.9
         Tx Power Threshold(dBm)          5.9       -5.0           2.9         -1.0
         LBC Threshold(mA)              75.00      25.00         70.00        30.00
         Temp. Threshold(celsius)       75.00      -5.00         70.00         0.00
         Voltage Threshold(volt)         3.63       2.97          3.46         3.13

         Polarization parameters not supported by optics

         Temperature = 38.00 Celsius 
         Voltage = 3.28 V 

 Transceiver Vendor Details

        Form Factor : SFP+
        Vendor Info
        -----------
         Optics type    : SFP+ 10G DWDM Tunable
         Name           : CISCO-OCLARO
         OUI Number     : 00.0b.40
         Part Number    : TRS7080FNCCA033
         Rev Number     : 0000
         Serial Number  : ONT2038009B
         PID            : DWDM-SFP10G-C
         VID            : V01


// DWDM Channel to Frequency/Wavelength Mapping
RP/0/RP0/CPU0:ios#show controllers optics 0/0/0/16 dwdm-carrrier-map 
Tue Sep  5 08:26:31.175 UTC
DWDM Carrier Band:: (null)
MSA ITU channel range supported: 1~96
 
DWDM Carrier Map table
----------------------------------------------------
ITU Ch   G.694.1         Frequency       Wavelength
 Num     Ch Num           (THz)            (nm)
----------------------------------------------------
     1   -35             191.35          1566.723
----------------------------------------------------
     2   -34             191.40          1566.314
----------------------------------------------------
     3   -33             191.45          1565.905
----------------------------------------------------
     4   -32             191.50          1565.496
----------------------------------------------------
     5   -31             191.55          1565.087
----------------------------------------------------
     6   -30             191.60          1564.679
----------------------------------------------------
     7   -29             191.65          1564.271
----------------------------------------------------
     8   -28             191.70          1563.863
----------------------------------------------------
     9   -27             191.75          1563.455
----------------------------------------------------
    10   -26             191.80          1563.047
----------------------------------------------------
    11   -25             191.85          1562.640
----------------------------------------------------
    12   -24             191.90          1562.233
----------------------------------------------------
    13   -23             191.95          1561.826
----------------------------------------------------
    14   -22             192.00          1561.419
----------------------------------------------------
    15   -21             192.05          1561.013
----------------------------------------------------
    16   -20             192.10          1560.606
----------------------------------------------------
    17   -19             192.15          1560.200
----------------------------------------------------
    18   -18             192.20          1559.794
----------------------------------------------------
    19   -17             192.25          1559.389
----------------------------------------------------
    20   -16             192.30          1558.983
----------------------------------------------------
    21   -15             192.35          1558.578
----------------------------------------------------
    22   -14             192.40          1558.173
----------------------------------------------------
    23   -13             192.45          1557.768
----------------------------------------------------
    24   -12             192.50          1557.363
----------------------------------------------------
    25   -11             192.55          1556.959
----------------------------------------------------
    26   -10             192.60          1556.555
----------------------------------------------------
    27   -9              192.65          1556.151
----------------------------------------------------
    28   -8              192.70          1555.747
----------------------------------------------------
    29   -7              192.75          1555.343
----------------------------------------------------
    30   -6              192.80          1554.940
----------------------------------------------------
    31   -5              192.85          1554.537
----------------------------------------------------
    32   -4              192.90          1554.134
----------------------------------------------------
    33   -3              192.95          1553.731
----------------------------------------------------
    34   -2              193.00          1553.329
----------------------------------------------------
    35   -1              193.05          1552.926
----------------------------------------------------
    36    0              193.10          1552.524
----------------------------------------------------
    37    1              193.15          1552.122
----------------------------------------------------
    38    2              193.20          1551.721
----------------------------------------------------
    39    3              193.25          1551.319
----------------------------------------------------
    40    4              193.30          1550.918
----------------------------------------------------
    41    5              193.35          1550.517
----------------------------------------------------
    42    6              193.40          1550.116
----------------------------------------------------
    43    7              193.45          1549.715
----------------------------------------------------
    44    8              193.50          1549.315
----------------------------------------------------
    45    9              193.55          1548.915
----------------------------------------------------
    46    10             193.60          1548.515
----------------------------------------------------
    47    11             193.65          1548.115
----------------------------------------------------
    48    12             193.70          1547.715
----------------------------------------------------
    49    13             193.75          1547.316
----------------------------------------------------
    50    14             193.80          1546.917
----------------------------------------------------
    51    15             193.85          1546.518
----------------------------------------------------
    52    16             193.90          1546.119
----------------------------------------------------
    53    17             193.95          1545.720
----------------------------------------------------
    54    18             194.00          1545.322
----------------------------------------------------
    55    19             194.05          1544.924
----------------------------------------------------
    56    20             194.10          1544.526
----------------------------------------------------
    57    21             194.15          1544.128
----------------------------------------------------
    58    22             194.20          1543.730
----------------------------------------------------
    59    23             194.25          1543.333
----------------------------------------------------
    60    24             194.30          1542.936
----------------------------------------------------
    61    25             194.35          1542.539
----------------------------------------------------
    62    26             194.40          1542.142
----------------------------------------------------
    63    27             194.45          1541.746
----------------------------------------------------
    64    28             194.50          1541.349
----------------------------------------------------
    65    29             194.55          1540.953
----------------------------------------------------
    66    30             194.60          1540.557
----------------------------------------------------
    67    31             194.65          1540.162
----------------------------------------------------
    68    32             194.70          1539.766
----------------------------------------------------
    69    33             194.75          1539.371
----------------------------------------------------
    70    34             194.80          1538.976
----------------------------------------------------
    71    35             194.85          1538.581
----------------------------------------------------
    72    36             194.90          1538.186
----------------------------------------------------
    73    37             194.95          1537.792
----------------------------------------------------
    74    38             195.00          1537.397
----------------------------------------------------
    75    39             195.05          1537.003
----------------------------------------------------
    76    40             195.10          1536.609
----------------------------------------------------
    77    41             195.15          1536.216
----------------------------------------------------
    78    42             195.20          1535.822
----------------------------------------------------
    79    43             195.25          1535.429
----------------------------------------------------
    80    44             195.30          1535.036
----------------------------------------------------
    81    45             195.35          1534.643
----------------------------------------------------
    82    46             195.40          1534.250
----------------------------------------------------
    83    47             195.45          1533.858
----------------------------------------------------
    84    48             195.50          1533.465
----------------------------------------------------
    85    49             195.55          1533.073
----------------------------------------------------
    86    50             195.60          1532.681
----------------------------------------------------
    87    51             195.65          1532.290
----------------------------------------------------
    88    52             195.70          1531.898
----------------------------------------------------
    89    53             195.75          1531.507
----------------------------------------------------
    90    54             195.80          1531.116
----------------------------------------------------
    91    55             195.85          1530.725
----------------------------------------------------
    92    56             195.90          1530.334
----------------------------------------------------
    93    57             195.95          1529.944
----------------------------------------------------
    94    58             196.00          1529.553
----------------------------------------------------
    95    59             196.05          1529.163
----------------------------------------------------
96	   60             196.10          1528.773

// Change Frequency

RP/0/RP0/CPU0:ios#conf t                          
Tue Sep  5 08:34:14.312 UTC
RP/0/RP0/CPU0:ios(config)#controller optics 0/0/0/16                
RP/0/RP0/CPU0:ios(config-Optics)#shutdown                                  
RP/0/RP0/CPU0:ios(config-Optics)#dwdm-carrier 50GHz-grid frequency 19335   
RP/0/RP0/CPU0:ios(config-Optics)#commit
Tue Sep  5 08:34:39.943 UTC
RP/0/RP0/CPU0:ios(config-Optics)#end
RP/0/RP0/CPU0:ios#show controllers optics 0/0/0/16
Tue Sep  5 08:34:42.824 UTC
 
 Controller State: Administratively Down 
 
 Transport Admin State: Out Of Service 
 
 Laser State: Off 
 
 LED State: Off 
 
 Optics Status 
 
         Optics Type:  SFP+ 10G DWDM Tunable
         DWDM carrier Info: C BAND, MSA ITU Channel=41, Frequency=193.35THz,
         Wavelength=1550.517nm 
 
         Alarm Status:
         -------------
         Detected Alarms: 
                 LOW-RX0-PWR   
 
         LOS/LOL/Fault Status:
 
         Laser Bias Current = 0.0 mA
         Actual TX Power = 0.00 dBm 
         RX Power = 0.00 dBm 
 
         Performance Monitoring: Enable 
 
         THRESHOLD VALUES
         ----------------
 
         Parameter                 High Alarm  Low Alarm  High Warning  Low Warning
         ------------------------  ----------  ---------  ------------  -----------
         Rx Power Threshold(dBm)         -2.9      -30.9          -7.0        -26.9
         Tx Power Threshold(dBm)          5.9       -5.0           2.9         -1.0
         LBC Threshold(mA)              75.00      25.00         70.00        30.00
         Temp. Threshold(celsius)       75.00      -5.00         70.00         0.00
         Voltage Threshold(volt)         3.63       2.97          3.46         3.13
 
         Polarization parameters not supported by optics
 
         Temperature = 39.00 Celsius 
         Voltage = 3.28 V 
 
 Transceiver Vendor Details
 
        Form Factor : SFP+
        Vendor Info
        -----------
         Optics type    : SFP+ 10G DWDM Tunable
         Name           : CISCO-OCLARO
         OUI Number     : 00.0b.40
         Part Number    : TRS7080FNCCA033
         Rev Number     : 0000
         Serial Number  : ONT2038009B
         PID            : DWDM-SFP10G-C
         VID            : V01

// Change Wavelength
 
RP/0/RP0/CPU0:ios#conf t     
Tue Sep  5 11:27:21.614 UTC
RP/0/RP0/CPU0:ios(config)#controller optics 0/0/0/16
RP/0/RP0/CPU0:ios(config-Optics)#shutdown
RP/0/RP0/CPU0:ios(config-Optics)#dwdm-carrier 50GHz-grid wavelength 1539766 
RP/0/RP0/CPU0:ios(config-Optics)#commit
Tue Sep  5 11:28:14.547 UTC
RP/0/RP0/CPU0:ios(config-Optics)#end
RP/0/RP0/CPU0:ios#show controllers optics 0/0/0/16
Tue Sep  5 11:28:30.934 UTC

 Controller State: Administratively Down 

 Transport Admin State: Out Of Service 

 Laser State: Off 

 LED State: Off 
 
 Optics Status 

         Optics Type:  SFP+ 10G DWDM Tunable
         DWDM carrier Info: C BAND, MSA ITU Channel=68, Frequency=194.70THz,
         Wavelength=1539.766nm 

         Alarm Status:
         -------------
         Detected Alarms: 
                 LOW-RX0-PWR   

         LOS/LOL/Fault Status:

         Laser Bias Current = 0.0 mA
         Actual TX Power = 0.00 dBm 
         RX Power = 0.00 dBm 

         Performance Monitoring: Enable 

         THRESHOLD VALUES
         ----------------

         Parameter                 High Alarm  Low Alarm  High Warning  Low Warning
         ------------------------  ----------  ---------  ------------  -----------
         Rx Power Threshold(dBm)         -2.9      -30.9          -7.0        -26.9
         Tx Power Threshold(dBm)          5.9       -5.0           2.9         -1.0
         LBC Threshold(mA)              75.00      25.00         70.00        30.00
         Temp. Threshold(celsius)       75.00      -5.00         70.00         0.00
         Voltage Threshold(volt)         3.63       2.97          3.46         3.13

         Polarization parameters not supported by optics

         Temperature = 38.00 Celsius 
         Voltage = 3.28 V 

 Transceiver Vendor Details

        Form Factor : SFP+
        Vendor Info
        -----------
         Optics type    : SFP+ 10G DWDM Tunable
         Name           : CISCO-OCLARO
         OUI Number     : 00.0b.40
         Part Number    : TRS7080FNCCA033
         Rev Number     : 0000
         Serial Number  : ONT2038009B
         PID            : DWDM-SFP10G-C
         VID            : V01
// Change Channel
RP/0/RP0/CPU0:ios#conf t
Tue Sep  5 08:29:03.648 UTC
RP/0/RP0/CPU0:ios(config)#controller optics 0/0/0/16
RP/0/RP0/CPU0:ios(config-Optics)#shutdown                  
RP/0/RP0/CPU0:ios(config-Optics)#dwdm-carrier 50GHz-grid ?  
  frequency   Configure Frequency and Map to ITU Channel
  itu-ch      Configure the ITU 50GHz Grid ITU Channel
  wavelength  Configure Wavelength and Map to ITU Channel
RP/0/RP0/CPU0:ios(config-Optics)#dwdm-carrier 50GHz-grid itu-ch 84
RP/0/RP0/CPU0:ios(config-Optics)#commit


RP/0/RP0/CPU0:ios#show controllers optics 0/0/0/16                   
Tue Sep  5 08:29:54.851 UTC

 Controller State: Administratively Down 

 Transport Admin State: Out Of Service 

 Laser State: Off 

 LED State: Off 
 
 Optics Status 

         Optics Type:  SFP+ 10G DWDM Tunable
         DWDM carrier Info: C BAND, MSA ITU Channel=84, Frequency=195.50THz,
         Wavelength=1533.465nm 

         Alarm Status:
         -------------
         Detected Alarms: 
                 LOW-RX0-PWR   

         LOS/LOL/Fault Status:

         Laser Bias Current = 0.0 mA
         Actual TX Power = 0.00 dBm 
         RX Power = 0.00 dBm 

         Performance Monitoring: Enable 

         THRESHOLD VALUES
         ----------------

         Parameter                 High Alarm  Low Alarm  High Warning  Low Warning
         ------------------------  ----------  ---------  ------------  -----------
         Rx Power Threshold(dBm)         -2.9      -30.9          -7.0        -26.9
         Tx Power Threshold(dBm)          5.9       -5.0           2.9         -1.0
         LBC Threshold(mA)              75.00      25.00         70.00        30.00
         Temp. Threshold(celsius)       75.00      -5.00         70.00         0.00
         Voltage Threshold(volt)         3.63       2.97          3.46         3.13

         Polarization parameters not supported by optics

         Temperature = 38.00 Celsius 
         Voltage = 3.28 V 

 Transceiver Vendor Details

        Form Factor : SFP+
        Vendor Info
        -----------
         Optics type    : SFP+ 10G DWDM Tunable
         Name           : CISCO-OCLARO
         OUI Number     : 00.0b.40
         Part Number    : TRS7080FNCCA033
         Rev Number     : 0000
         Serial Number  : ONT2038009B
         PID            : DWDM-SFP10G-C
         VID            : V01

Priority Flow Control (PFC)

Priority flow control (PFC; IEEE 802.1Qbb), which is also referred to as Class-based Flow Control (CBFC) or Per Priority Pause (PPP), is a mechanism that prevents frame loss that is due to congestion. PFC is similar to 802.3x Flow Control (pause frames) or link-level flow control (LLFC). However, PFC functions on a per class-of-service (CoS) basis.

During congestion, PFC sends a pause frame that indicates which CoS value needs to be paused. A PFC pause frame contains a 2-octet timer value for each CoS that indicates the length of time that the traffic needs to be paused. The unit of time for the timer is specified in pause quanta. A quanta is the time that is required for transmitting 512 bits at the speed of the port. The range is from 0 to 65535.


Note

The router sends out the required amount of pause frames or pause-threshold (x-off ) messages to achieve lossless queues. It also sends out resume-threshold (x-on) messages.

PFC asks the peer to stop sending frames of a particular CoS value by sending a pause frame to a well-known multicast address. This pause frame is a one-hop frame that is not forwarded when received by the peer. When the congestion is mitigated, the router stops sending the PFC frames to the upstream node.

  • NC55-36X100G-BA

  • NC55-24H12F-SB

  • NC55-24X100G-SB

  • NC55-18H18F-BA

  • NC55-36X100G-SB

  • NC55-36X100G-U-SB

Restrictions for PFC

PFC has the following restrictions:

  • PFC for transmit is not supported for internal traffic (recycle / loopback) and non-unicast traffic (broadcast / multicast).

  • PFC for receive impacts all traffic meant to go out of the port. This may cause unintended drops to both unicast and non-unicast traffic because non-unicast traffic may consume buffer descriptors, thus starving unicast traffic. Hence, PFC is incompatible with sustained high rate non-unicast traffic in the system.

  • PFC configuration will enable or disable both PFC transmit and receive functionalities. There is no support to enable only transmit or receive functions.

  • When the PFC transmit thresholds for a particular CoS value are crossed, PFC pause frames for that CoS value will be transmitted out of all ports on that NP core, including the port that may have received pause frames from a peer. This is required as traffic for that CoS value may enter the router from any of the ports in that NP core.

  • There is no option to clear the PFC frame counters displayed on the show controller command. They aggregate until the device reloads, irrespective of software configuration changes.

  • There is no MIB support for PFC frame counters displayed on the show controller command.

  • Standards compliant PFC receive functionality and watchdog monitoring requires an 8-priority egress queuing policy on all PFC enabled interfaces. Since 8-priority egress queuing policies are only supported in the non-HQoS profile, PFC is also supported only in the non-HQoS profile. For more details on this QoS prerequisite and configuration examples, please refer to Modular QoS Configuration Guide for Cisco NCS 5500 Series Routers.

  • PFC is only qualified on 40G and 100G physical interface types. PFC is not supported on breakout ports for these interface types and is not qualified on other interface types.

  • Being an Ethernet feature, PFC has to be individually configured on the member interfaces of a bundle instead of the bundle interface. The user is expected to either enable or disable PFC on all members of the bundle, as a mix isn’t supported.

Configuring Priority Flow Control

Use the following steps to configure Priority Flow Control:

Configuration:

RP/0/RP0/CPU0:router# configure
RP/0/RP0/CPU0:router(configure)#interface HundredGigE0/0/0/0
RP/0/RP0/CPU0:router(config)# priority-flow-control mode on

Running configuration:

*Interface Level*
interface HundredGigE0/0/0/0
priority-flow-control mode on

Verification:

Per-port, per-CoS PFC Rx and Tx frame counters can be checked by the show controllers <interface> command: 

RP/0/RP0/CPU0:router#show controllers hundredGigE 0/0/0/0   
Thu Nov 28 11:13:22.829 UTC
Operational data for interface HundredGigE0/0/0/0:
 
State:
    Administrative state: disabled
    Operational state: Down (Reason: Link is shutdown)
    LED state: Off
 
Phy:
    Media type: Not known
    No optics present
    Alarms:
        Current:
            No alarms
    Statistics:
        FEC:
            Corrected Codeword Count: 0
            Uncorrected Codeword Count: 0
 
MAC address information:
    Operational address: 008a.96ce.6424
    Burnt-in address: 008a.96ce.6424
 
Autonegotiation disabled.
 
Priority Flow Control:
    Total Rx PFC Frames: 0
    Total Tx PFC Frames: 0
    CoS  Status  Rx Frames   Tx Frames
    ---  ------  ----------  ----------
      0  on               0           0
      1  on               0           0
      2  on               0           0
      3  on               0           0
      4  on               0           0
      5  on               0           0
      6  on               0           0
      7  on               0           0

How to Configure Interfaces in Breakout Mode

Information About Breakout

The router supports transmission of traffic in the breakout mode. The breakout mode enables a 40GbE, 100GbE, or 400GbE port to be split into multiple GbE ports.

Breakout Mode options:

  • 4x10GbE

  • 4x25GbE

  • 2x50GbE

  • 8x50GbE

  • 4x100GbE

  • 3x100GbE

  • 2x100GbE

  • 1x100GbE


Note

The supported breakout mode is dependent on the port and optic transceiver

Configure Breakout in a Port

This example shows how to configuring a 4x10GbE breakout in a port:
RP/0/RP0/CPU0:Router# configure
RP/0/RP0/CPU0:Router(config)# controller optics 0/1/0/28
RP/0/RP0/CPU0:Router(config-Optics)# breakout 4x10
RP/0/RP0/CPU0:Router(config-Optics)# commit
RP/0/RP0/CPU0:Router(config-Optics)# end
RP/0/RP0/CPU0:Router#

Remove the Breakout Configuration

Removing the breakout configuration:
RP/0/RP0/CPU0:Router# configure
RP/0/RP0/CPU0:Router(config)# controller optics 0/1/0/28
RP/0/RP0/CPU0:Router(config-Optics)# no breakout 4x10
RP/0/RP0/CPU0:Router(config-Optics)# commit
RP/0/RP0/CPU0:uut(config-Optics)# end

Verify a Breakout Configuration

Verifying a breakout configuration:
RP/0/RP0/CPU0:Router# show running-config controller optics 0/1/0/28
controller Optics0/1/0/28
breakout 4x10
!
 
RP/0/RP0/CPU0:Router# show int br location 0/1/CPU0 | i Te0/1/0/28
       Te0/1/0/27/0          up          up               ARPA 10000   10000000
       Te0/1/0/27/1          up          up               ARPA 10000   10000000
       Te0/1/0/27/2          up          up               ARPA 10000   10000000
       Te0/1/0/27/3          up          up               ARPA 10000   10000000
       Te0/1/0/28/0          up          up               ARPA 10000   10000000
       Te0/1/0/28/1          up          up               ARPA 10000   10000000
       Te0/1/0/28/2          up          up               ARPA 10000   10000000
       Te0/1/0/28/3          up          up               ARPA 10000   10000000

How to Configure Interfaces in Breakout Mode

Information About Breakout

The router supports transmission of traffic in the breakout mode. The breakout mode enables a 40GbE, 100GbE, or 400GbE port to be split into multiple GbE ports.

Breakout Mode options:

  • 4x10GbE

  • 4x25GbE

  • 2x50GbE

  • 8x50GbE

  • 4x100GbE

  • 3x100GbE

  • 2x100GbE

  • 1x100GbE


Note

The supported breakout mode is dependent on the port and optic transceiver

Configure Breakout in a Port

This example shows how to configuring a 4x10GbE breakout in a port:
RP/0/RP0/CPU0:Router# configure
RP/0/RP0/CPU0:Router(config)# controller optics 0/1/0/28
RP/0/RP0/CPU0:Router(config-Optics)# breakout 4x10
RP/0/RP0/CPU0:Router(config-Optics)# commit
RP/0/RP0/CPU0:Router(config-Optics)# end
RP/0/RP0/CPU0:Router#

Remove the Breakout Configuration

Removing the breakout configuration:
RP/0/RP0/CPU0:Router# configure
RP/0/RP0/CPU0:Router(config)# controller optics 0/1/0/28
RP/0/RP0/CPU0:Router(config-Optics)# no breakout 4x10
RP/0/RP0/CPU0:Router(config-Optics)# commit
RP/0/RP0/CPU0:uut(config-Optics)# end

Verify a Breakout Configuration

Verifying a breakout configuration:
RP/0/RP0/CPU0:Router# show running-config controller optics 0/1/0/28
controller Optics0/1/0/28
breakout 4x10
!
 
RP/0/RP0/CPU0:Router# show int br location 0/1/CPU0 | i Te0/1/0/28
       Te0/1/0/27/0          up          up               ARPA 10000   10000000
       Te0/1/0/27/1          up          up               ARPA 10000   10000000
       Te0/1/0/27/2          up          up               ARPA 10000   10000000
       Te0/1/0/27/3          up          up               ARPA 10000   10000000
       Te0/1/0/28/0          up          up               ARPA 10000   10000000
       Te0/1/0/28/1          up          up               ARPA 10000   10000000
       Te0/1/0/28/2          up          up               ARPA 10000   10000000
       Te0/1/0/28/3          up          up               ARPA 10000   10000000