Juniper QFX3500 - Virtual Chassis Ports (Vcps); Maximum Switch Support

switches can also be interconnected into a mixed Virtual Chassis with QFX3500,
QFX3600, and QFX5100 switches.)
This topic does not discuss Virtual Chassis Fabric components. For information on Virtual
Chassis Fabric components, see Understanding Virtual Chassis Fabric Components.
This topic covers:
•
Virtual Chassis Ports (VCPs) on page 12
•
Maximum Switch Support on page 12
•
Master Routing Engine Role on page 13
•
Backup Routing Engine Role on page 14
•
Linecard Role on page 14
•
Member Switch and Member ID on page 15
•
Mastership Priority on page 16
Virtual Chassis Ports (VCPs)
You set up a Virtual Chassis by configuring Virtual Chassis ports (VCPs) on the member
switches, and interconnecting the switches using the VCPs. VCPs are responsible for
passing all data and control traffic between member switches in the Virtual Chassis.
The following options are available for configuring VCPs on the switches in a QFX Series
Virtual Chassis:
•
Any 100-Gbps or 40-Gbps QSFP28 ports on QFX5110 switches can be configured into
VCPs.
•
Any non-channelized 40-Gbps QSFP+ interfaces on QFX3500, QFX3600, QFX5100,
and QFX5110 switches can be configured into VCPs.
•
40-Gbps QSFP+ interfaces that have been channelized into SFP+ interfaces using a
breakout cable cannot be configured into VCPs, but all other non-channelized SFP+
interfaces on QFX series switches can be configured into VCPs, and can also be used
to interconnect EX4300 switches into a mixed QFX and EX Series Virtual Chassis.
You can increase VCP bandwidth between member switches by configuring multiple
interfaces between the same two switches into VCPs. When multiple VCPs interconnect
the same two member switches, a Link Aggregation Group (LAG) or bundle is
automatically formed when the VCPs are on interfaces supporting identical speeds. For
example, if you have two 40-Gbps QSFP+ interfaces configured as VCPs between
member switches, a LAG with two member links with 80-Gbps of total bandwidth is
formed. However, 10-Gigabit SFP+ and 40-Gbps QSFP+ interfaces configured as VCPs
will not become members of the same LAG. See Understanding Virtual Chassis Port Link
Aggregation.
Maximum Switch Support
In a QFX Series Virtual Chassis, you can interconnect up to 10 standalone switches in the
following supported combinations:
Copyright © 2017, Juniper Networks, Inc.12
QFX3500 Device Hardware Documentation