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Dell Configuration Guide for the S4048–ON System 9.14.2.4

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Adding a Physical Interface to a Port Channel

The physical interfaces in a port channel can be on any line card in the chassis, but must be the same physical type.

NOTE Port channels can contain a mix of Ethernet interfaces, but Dell EMC Networking OS disables the interfaces that are not the same speed of the first channel member in the port channel (refer to 10/100/1000 Mbps Interfaces in Port Channels).
You can add any physical interface to a port channel if the interface configuration is minimal. You can configure only the following commands on an interface if it is a member of a port channel:
  • description
  • shutdown/no shutdown
  • mtu
NOTE A logical port channel interface cannot have flow control. Flow control can only be present on the physical interfaces if they are part of a port channel.
NOTE The system supports jumbo frames by default (the default maximum transmission unit (MTU) is 1554 bytes). To configure the MTU, use the mtu command from INTERFACE mode.

To view the interface’s configuration, enter INTERFACE mode for that interface and use the show config command or from EXEC Privilege mode, use the show running-config interface interface command.

When an interface is added to a port channel, Dell EMC Networking OS recalculates the hash algorithm.

To add a physical interface to a port, use the following commands.

  1. Add the interface to a port channel.
    INTERFACE PORT-CHANNEL mode
    channel-member interface
    The interface variable is the physical interface type and slot/port information.
  2. Double check that the interface was added to the port channel.
    INTERFACE PORT-CHANNEL mode
    show config

Examples of the show interfaces port-channel Commands

To view the port channel’s status and channel members in a tabular format, use the show interfaces port-channel brief command in EXEC Privilege mode, as shown in the following example.
DellEMC#show int port brief

LAG Mode Status Uptime   Ports
1 L2L3   up     00:06:03 Te 1/6 (Up) *
                         Te 1/12 (Up)
2 L2L3   up     00:06:03 Te 1/7 (Up) *
                         Te 1/8 (Up)
                         Te 1/13 (Up)
                         Te 1/14 (Up)
DellEMC#

The following example shows the port channel’s mode (L2 for Layer 2 and L3 for Layer 3 and L2L3 for a Layer 2-port channel assigned to a routed VLAN), the status, and the number of interfaces belonging to the port channel.

DellEMC>show interface port-channel 20
Port-channel 20 is up, line protocol is up
Hardware address is 00:01:e8:01:46:fa
Internet address is 1.1.120.1/24
MTU 1554 bytes, IP MTU 1500 bytes
LineSpeed 2000 Mbit
Members in this channel: Te 1/10 Te 1/17
ARP type: ARPA, ARP timeout 04:00:00
Last clearing of "show interface" counters 00:00:00
Queueing strategy: fifo
  1212627 packets input, 1539872850 bytes
  Input 1212448 IP Packets, 0 Vlans 0 MPLS
  4857 64-byte pkts, 17570 over 64-byte pkts, 35209 over 127-byte pkts
  69164 over 255-byte pkts, 143346 over 511-byte pkts, 942523 over 1023-byte pkts
  Received 0 input symbol errors, 0 runts, 0 giants, 0 throttles
  42 CRC, 0 IP Checksum, 0 overrun, 0 discarded
  2456590833 packets output, 203958235255 bytes, 0 underruns
  Output 1640 Multicasts, 56612 Broadcasts, 2456532581 Unicasts
  2456590654 IP Packets, 0 Vlans, 0 MPLS
  0 throttles, 0 discarded
Rate info (interval 5 minutes):
  Input 00.01Mbits/sec, 2 packets/sec
  Output 81.60Mbits/sec, 133658 packets/sec
Time since last interface status change: 04:31:57

DellEMC>

When more than one interface is added to a Layer 2-port channel, Dell EMC Networking OS selects one of the active interfaces in the port channel to be the primary port. The primary port replies to flooding and sends protocol data units (PDUs). An asterisk in the show interfaces port-channel brief command indicates the primary port.

As soon as a physical interface is added to a port channel, the properties of the port channel determine the properties of the physical interface. The configuration and status of the port channel are also applied to the physical interfaces within the port channel. For example, if the port channel is in Layer 2 mode, you cannot add an IP address or a static MAC address to an interface that is part of that port channel. In the following example, interface 1/6 is part of port channel 5, which is in Layer 2 mode, and an error message appeared when an IP address was configured.

DellEMC(conf-if-portch)#show config
!
interface Port-channel 5
  no ip address
  switchport
  channel-member TenGigabitEthernet 1/6
DellEMC(conf-if-portch)#int Te 1/6
DellEMC(conf-if)#ip address 10.56.4.4 /24
% Error: Port is part of a LAG Te 1/6.
DellEMC(conf-if)#

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