
–
secondary
: the IP address is the interface’s backup IP address. You can configure up to eight secondary IP addresses.
Deleting or Disabling a Port Channel
To delete or disable a port channel, use the following commands.
•
Delete a port channel.
CONFIGURATION mode
no interface portchannel
channel-number
•
Disable a port channel.
shutdown
When you disable a port channel, all interfaces within the port channel are operationally down also.
Load Balancing Through Port Channels
Dell Networking OS uses hash algorithms for distributing traffic evenly over channel members in a port channel (LAG).
The hash algorithm distributes traffic among Equal Cost Multi-path (ECMP) paths and LAG members. The distribution is based on a
flow, except for packet-based hashing. A flow is identified by the hash and is assigned to one link. In packet-based hashing, a single
flow can be distributed on the LAG and uses one link.
Packet based hashing is used to load balance traffic across a port-channel based on the IP Identifier field within the packet. Load
balancing uses source and destination packet information to get the greatest advantage of resources by distributing traffic over
multiple paths when transferring data to a destination.
Dell Networking OS allows you to modify the hashing algorithms used for flows and for fragments. The load-balance and hash-
algorithm commands are available for modifying the distribution algorithms.
Changing the Hash Algorithm
The
load-balance
command selects the hash criteria applied to port channels.
If you do not obtain even distribution with the
load-balance
command, you can use the
hash-algorithm
command to select
the hash scheme for LAG, ECMP and NH-ECMP. You can rotate or shift the 12–bit Lag Hash until the desired hash is achieved.
To change to another algorithm, use the second command.
•
Change the default (0) to another algorithm and apply it to ECMP, LAG hashing, or a particular line card.
CONFIGURATION mode
hash-algorithm {ecmp {
crc16
|
crc16cc
|
crc32MSB
|
crc32LSB
|
crc-upper
|
dest-ip
| flow-
based-hashing {
crc16
|
crc16cc
|
crc32MSB
|
crc32LSB
|
xor1
|
xor2
|
xor4
|
xor8
|
xor16
}|
lsb
|
xor1
|
xor2
|
xor4
|
xor8
|
xor16
}[[hg {
crc16
|
crc16cc
|
crc32MSB
|
crc32LSB
|
xor1
|
xor2
|
xor4
|
xor8
|
xor16
}]| [lag {
crc16
|
crc16cc
|
crc32MSB
|
crc32LSB
|
xor1
|
xor2
|
xor4
|
xor8
|
xor16
}][stack-unit|linecard
number
| port-set
number
| [
hg—seed seed-value
|
seed
seed-value
For more information about algorithm choices, refer to the command details in the
IP Routing
chapter of the
Dell Networking OS
Command Reference Guide
.
•
Change to another algorithm.
CONFIGURATION mode
hash-algorithm [ecmp{crc16|crc16cc|crc32LSB|crc32MSB|crc-upper|dest-ip|lsb|xor1|xor2|
xor4|xor8|xor16}]
Interfaces
383
Summary of Contents for S4048-ON
Page 1: ...Dell Configuration Guide for the S4048 ON System 9 9 0 0 ...
Page 146: ...Figure 14 BFD Three Way Handshake State Changes 146 Bidirectional Forwarding Detection BFD ...
Page 522: ...Figure 87 Configuring Interfaces for MSDP 522 Multicast Source Discovery Protocol MSDP ...
Page 523: ...Figure 88 Configuring OSPF and BGP for MSDP Multicast Source Discovery Protocol MSDP 523 ...
Page 528: ...Figure 91 MSDP Default Peer Scenario 1 528 Multicast Source Discovery Protocol MSDP ...
Page 529: ...Figure 92 MSDP Default Peer Scenario 2 Multicast Source Discovery Protocol MSDP 529 ...
Page 530: ...Figure 93 MSDP Default Peer Scenario 3 530 Multicast Source Discovery Protocol MSDP ...
Page 633: ...Policy based Routing PBR 633 ...
Page 777: ...Figure 119 Single and Double Tag TPID Match Service Provider Bridging 777 ...
Page 778: ...Figure 120 Single and Double Tag First byte TPID Match 778 Service Provider Bridging ...