Reference Guide

• Enter the loopback interface number in CONFIGURATION mode (0 to 16383).
interface loopback number
• Enter the loopback interface number to view the conguration in EXEC mode.
show interface loopback number
• Enter the loopback interface number to delete a loopback interface in CONFIGURATION mode.
no interface loopback number
View loopback interface
OS10# show interface loopback 4
Loopback 4 is up, line protocol is up
Hardware is unknown.
Interface index is 102863300
Internet address is 120.120.120.120/24
Mode of IPv4 Address Assignment : MANUAL
MTU 1532 bytes
Flowcontrol rx false tx false
ARP type: ARPA, ARP Timeout: 240
Last clearing of "show interface" counters : 00:00:11
Queuing strategy : fifo
Input 0 packets, 0 bytes, 0 multicast
Received 0 errors, 0 discarded
Output 0 packets, 0 bytes, 0 multicast
Output 0 errors, Output 0 invalid protocol
Time since last interface status change : 00:00:11
Port-channel interfaces
Port-channels are not congured by default. Link aggregation is a method of grouping multiple physical interfaces into a single logical
interface — a link aggregation group (LAG) or port -channel. A port-channel aggregates the bandwidth of member links, provides
redundancy, and load balances trac. If a member port fails, the remaining member ports carry the trac on the failed port.
A physical interface can belong to only one port-channel at a time, and a port-channel must contain interfaces of the same interface type
and speed. OS10 supports up to 128 port-channels, with up to 16 10G or 40G ports per channel.
To congure a port-channel, use the same conguration commands as for Ethernet port interfaces. Port-channels are transparent to
network congurations and managed as a single interface. For example, congure one IP address for the group, and use the IP address for
all routed trac on the port-channel.
You can create larger capacity interfaces by using a group of lower speed links. For example, you can build a 50G interface by aggregating
ve 10G Ethernet interfaces together — if one of the ve interfaces fails, trac is redistributed across the four remaining interfaces.
Static
Port-channels are statically congured.
Dynamic Port-channels are dynamically congured using link aggregation control protocol (LACP).
Member ports of a LAG are added and programmed into the hardware in a predictable order based on the port ID, instead of in the order in
which the ports come up. Load balancing yields predictable results across resets and reloads.
Create port-channel
You can create up to 128 port-channels, with up to 16 port members per group. Congure a port-channel similar to a physical interface by
enabling or conguring protocols, or assigning access control lists (ACLs). After you enable the port-channel, you can place it in L2 or L3
mode.
To place the port-channel in L2 mode or congure an IP address to place the port-channel in L3 mode, use the switchport command.
1 Create a port-channel in CONFIGURATION mode.
interface port-channel id-number
Interfaces
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