flow-groups
Syntax
flow-groups {
flow-group-name {
node-device (node-device-name | serial-ID | alias);
interconnect-device interconnect-device-name;
}
node-device (node-device-name | serial-ID | alias) {
interconnect-device interconnect-device- name {
preference (high | normal | never);
}
}
}
Hierarchy Level
[edit fabric]
Description
In a QFabric system, a hash function is used to select an Interconnect device to forward traffic between two ingress switches, which are called Node devices. Since this hash function is performed on all Interconnect devices, it is possible for redundant multicast streams to flow through one Interconnect device, making that Interconnect device a potential single point of failure for the redundant flows. Some operations, such as financial transactions, require redundant data flows to use different Interconnect devices to avoid point-of-failure data loss. To enforce this in a fabric, you can create a flow group for multicast or unicast traffic from a particular ingress switch. In a flow group, switches are forced to use different, specified Interconnect devices to forward redundant traffic.
The following rules apply to QFabric system flow control:
A Node device can belong to only one flow group.
A fabric can contain up to four flow groups.
Node devices in flow groups can only use the defined Interconnect devices in their flow groups unless all defined Interconnect devices fail. In case of failure, the flow group checks for Interconnect devices with preference set to
normal—this includes all Interconnect devices in the default group and any Interconnect devices you specifically set to preferencenormal.
The following example creates a flow group. The name of the flow group, test1, is configured first. Next, the Node device TA3713480203 is configured, and the Interconnect device IC-P6603-C is configured last.
[edit fabric]
root@qfabric# set flow-groups ?
Possible completions:
<flow group name> Flow Group name
+ apply-groups Groups from which to inherit configuration data
+ apply-groups-except Don't inherit configuration data from these groups
> node-device Override the link preference for Node device(s)
root@qfabric# set flow-groups test1 ?
Possible completions:
+ apply-groups Groups from which to inherit configuration data
+ apply-groups-except Don't inherit configuration data from these groups
> interconnect-device Interconnect device(s) associated with this flow group
> node-device Node device(s) associated with this flow group
root@qfabric# set flow-groups test1 node-device ?
Possible completions:
<node-device-name> Serial ID or alias of node-device
P3686-C Node device
TA3713480203 Node device
TA3713500165 Node device
TA3713500185 Node device
TA3713500307 Node device
root@qfabric# set flow-groups test1 node-device TA3713480203 ?
Possible completions:
<Enter> Execute this command
+ apply-group Groups from which to inherit configuration data
+ apply-groups-except Don't inherit configuration data from these groups
| Pipe through a command
root@qfabric# set fabric flow-groups test1 node-device TA3713480203
root@qfabric# set flow-groups test1 interconnect-device ?
Possible completions:
<interconnect-device-name> Serial ID or alias of interconnect-device
IC-P6601-C Interconnect device
IC-P6603-C Interconnect device
root@qfabric# set flow-groups test1 interconnect-device IC-P6603-C
root@qfabric# show flow-groups
test1 {
node-device {
TA3713480203;
}
interconnect-device {
IC-P6603-C;
}
}
The following example overrides the software settings the flow
group test1 Node device TA3713500307 was assigned by the software
for Interconnect device IC-P6601-C. Node device TA3713500307 has its
preference for Interconnect device IC-P6601-C set to never by the software, meaning that Node device TA3713500307 can never
use Interconnect device IC-P6601-C. You can change this preference
so that Interconnect device IC-P6601-C can be used by Node device
TA3713500307 if the specifically-configured Interconnect devices all
fail. You use the preference option of the flow-groups configuration
statement to set Interconnect device IC-P6601-C preference to normal for Node device TA3713500307.
To configure the preference setting for a Node device to use a particular Interconnnect device, you first select the Node device, then specify the Interconnect device, and finally specify the preference option:
[edit fabric]
root@qfabric# set flow-groups ?
Possible completions:
<flow-group name> Flow Group name
+ apply-groups Groups from which to inherit configuration data
+ apply-groups-except Don't inherit configuration data from these groups >
node-device Override the link preference for Node device(s)
test1 Flow Group name
root@qfabric# set flow-groups node-device ?
Possible completions:
<name> serial ID or alias of node-device
P3686-C Node device
TA3713480203 Node device
TA3713500185 Node device
TA3713500307 Node device
root@qfabric# set fabric flow-groups node-device TA3713500307 ?
Possible completions:
+ apply-groups Groups from which to inherit configuration data
+ apply-groups-except Don't inherit configuration data from these groups
interconnect device
root@qfabric# set fabric flow-groups node-device TA3713500307 interconnect-device ?
Possible completions:
<name> Serial ID or alias of interconnect-device
IC-P6601-C Interconnect device
IC-P6603-C Interconnect device
root@qfabric# set fabric flow-groups node-device TA3713500307 interconnect-device IC-P6601-C
preference ?
Possible completions:
high High link preference
never Never use this link
normal Normal link reference
root@qfabric# set fabric flow-groups node-device TA3713500307 interconnect-device IC-P6601-C preference never
root@qfabric# show fabric flow-groups
test1 {
node-device {
TA3713480203;
}
interconnect-device {
IC-P6603-C;
}
}
node-device TA3713500307 {
interconnect-device IC-P6601-C {
preference never;
}
}
To add a TOR to multiple flow groups: set fabric resources node-device TOR-B interconnect-device IC-A preference HIGH To configure a TOR to use an Interconnect device from a different flow group if none in the same flow group are available: set fabric resources node-device TOR-B interconnect-device IC-A preference NORMALTo increase the priority of default-flowgroup Interconnect devices for a specific TOR: set fabric resources node-device TOR-A interconnect-device ALL_ICS preference HIGH To configure default-flowgroup TORs to never use a particular Interconnect device: Set fabric resources node-device ALL_TORS interconnect-device IC-A preference NEVER
Options
| node-device node-device-name | Specify a QFabric system ingress Node switch by device name or alias in the QFabric system. |
| interconnect-device interconnect-device-name | Specify a QFabric system Interconnect device name. |
| preference preference | Overrides the algorithm results that assign preference
to Node devices to use particular Interconnect devices. You can set
preference values for these devices to |
Required Privilege Level
admin—To view this statement in the configuration.
admin-control—To add this statement to the configuration.
Release Information
Statement introduced in Junos OS Release 14.1X53-D15.