Junos® OS Ethernet Interfaces Configuration ... - Juniper Networks

Related
Documentation
For more information about configuring VPLS, see the Junos OS VPNs Configuration
Guide and the Junos OS Feature Guides.
You can also configure CoS on logical IQ interfaces. For more information, see the Junos
OS Class of Service Configuration Guide.
•
Configuring Gigabit Ethernet Policers on page 317
• Configuring Gigabit Ethernet Two-Color and Tricolor Policers on page 323
• Configuring MAC Address Accounting on page 326
• Configuring a Policer Overhead
• Junos® OS Ethernet Interfaces
Configuring Gigabit Ethernet Policers
Copyright © 2012, Juniper Networks, Inc.
On Gigabit Ethernet IQ and Gigabit Ethernet PICs with SFPs (except the 10-port Gigabit
Ethernet PIC and the built-in Gigabit Ethernet port on the M7i router), you can define rate
limits for premium and aggregate traffic received on the interface. These policers allow
you to perform simple traffic policing without configuring a firewall filter. First you configure
the Ethernet policer profile, next you classify ingress and egress traffic, then you can
apply the policer to a logical interface.
For Gigabit Ethernet PICs with SFPs (except the 10-port Gigabit Ethernet PIC and the
built-in Gigabit Ethernet port on the M7i router), the policer rates you configure can be
different than the rates on the Packet Forward Engine. The difference results from Layer
2 overhead. The PIC accounts for this difference.
NOTE:
On MX Series routers with Gigabit Ethernet or Fast Ethernet PICs, the following
considerations apply:
• Interface counters do not count the 7-byte preamble and 1-byte frame
delimiter in Ethernet frames.
• In MAC statistics, the frame size includes MAC header and CRC before any
VLAN rewrite/imposition rules are applied.
• In traffic statistics, the frame size encompasses the L2 header without CRC
after any VLAN rewrite/imposition rule.
For information on understanding Ethernet frame statistics, see the MX Series Layer 2
Configuration Guide.
This section contains the following topics:
• Configuring a Policer on page 318
• Specifying an Input Priority Map on page 318
• Specifying an Output Priority Map on page 319
Chapter 18: Configuring Gigabit Ethernet Accounting and Policing
317