Queuing MPCs contain a queuing chip that enables rich-queuing features such as
hierarchical and per-vlan queuing. By default, all traffic passing through an interface
on one of these MPCs also passes through the queuing chip, which decreases the available
bandwidth of the interface. If you do not require hierarchical or per-vlan queuing on a
particular interface of a queuing MPC, you can bypass the queuing chip to increase the
available bandwidth.
To bypass the queuing chip on a queuing MPC, you must be running Junos OS Release
14.2 or later.
Starting with Junos OS 18.2R1, you can enable this option on vMX routers to save a
vCPU when scheduling is not needed on an interface.
To bypass the queuing chip on an interface on a queuing
MPC:
- Ensure that neither
per-unit-scheduler
nor
hierarchical-scheduler
is configured on the interface.
Note:
It is not possible to bypass the queuing chip on an interface if per-unit
or hierarchical scheduling is configured on that interface.
- Ensure that flexi-queuing-mode is enabled.
- Enable
bypass-queuing-chip
on the interface.
For example:
[edit interfaces]
user@router# set interface- name bypass-queuing-chip
- Commit your changes.
[edit interfaces]
user@router# show
interface-name {
bypass-queueing-chip;
}
- Verify your changes.
user@router> show interfaces interface-name
Physical interface: interface-name, Enabled, Physical link is Up
Interface index: 147, SNMP ifIndex: 524
Link-level type: Ethernet, MTU: 1514, MRU: 1522, LAN-PHY mode, Speed: 1000mbps,
BPDU Error: None, MAC-REWRITE Error: None, Loopback: Disabled, Source filtering: Disabled,
Flow control: Enabled, Auto-negotiation: Enabled, Remote fault: Online
Pad to minimum frame size: Disabled
Device flags : Present Running
Interface flags: SNMP-Traps Internal: 0x4000
Link flags : None
CoS queues : 8 supported, 4 maximum usable queues
Schedulers : 0, Queuing Chip Bypassed
Current address: 00:21:59:0f:35:31, Hardware address: 00:21:59:0f:35:31
Last flapped : 2014-04-29 14:10:18 PDT (02:27:46 ago)
Input rate : 0 bps (0 pps)
Output rate : 0 bps (0 pps)
Active alarms : None
Active defects : None
Interface transmit statistics: Disabled
Change History Table
Feature support is determined by the platform and release you are using. Use Feature Explorer to determine if a feature is supported on your platform.
18.2R1
Starting with Junos
OS 18.2R1, you can enable this option on vMX routers to save a vCPU
when scheduling is not needed on an interface.
14.2
To bypass the queuing chip on a queuing MPC, you must be running Junos OS Release
14.2 or later.
