Table 107: Summary of Key CoS Forwarding Class Output Fields
ValuesField
Names of forwarding classes assigned to queue numbers. The following are the default
forwarding classes:
• best-effort—Provides no special CoS handling of packets. Loss priority is typically not
carried in a CoS value.
• expedited-forwarding—Provides low loss, low delay, low jitter, assured bandwidth, and
end-to-end service.
• assured-forwarding—Provides high assurance for packets within the specified service
profile. Excess packets are dropped.
• network-control—Packets can be delayed but not dropped.
EX8200 switches have the following additional default forwarding classes:
• mcast-be—Provides no special CoS handling of packets.
• mcast-ef—Provides low loss, low delay, low jitter, assured bandwidth, and end-to-end
service.
• mcast-af—Provides high assurance for packets within the specified service profile. Excess
packets are dropped.
EX4300 switches supports all the forwarding classes mentioned above and the one
mentioned in this section:
• mcast-nc—Provides multicast network-control traffic.
Forwarding Class
Queue number corresponding to the forwarding class name. The default forwarding classes
are assigned as follows:
• best-effort—0
• expedited-forwarding—5
• assured-forwarding—1
• network-control—7
• mcast-be—2
• mcast-ef—4
• mcast-af—6
EX4300 switches have the following queue numbers for the forwarding classes:
• best-effort—0
• expedited-forwarding—1
• assured-forwarding—2
• network-control—3
• mcast-be—8
• mcast-ef—9
• mcast-af—10
• mcast-nc—11
Queue
(EX8200 switches only) Fabric priority for the forwarding class, either high or low. The fabric
priority determines the priority of packets entering the switch fabric.
Fabric Priority
229Copyright © 2017, Juniper Networks, Inc.
Chapter 16: Monitoring Tasks
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