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

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OS 12.3 Ethernet Interfaces Configuration Guide
Configuring Control Queue Disable on a 10-port 10-Gigabit Ethernet LAN/WAN PIC
346
On a 10-port 10-Gigabit Ethernet LAN/WAN PIC with SFP+ (model number
PD-5-10XGE-SFPP), a control queue is used to queue all control packets received on an
ingress port. This ensures that control protocol packets do not get dropped randomly
when there is congestion due to oversubscription. The following control protocols are
supported:
• OSPF
• OSPF3
• VRRP
• IGMP
• RSVP
• PIM
• BGP
• BFD
• LDP
• IS-IS
• RIP
• RIPV6
• LACP
• ARP
• IPv6 NDP
• Connectivity fault management (CFM)
• Link fault management (LFM)
These control packets can either terminate locally or transit through the router. The
control queue has a rate limiter to limit the control traffic to 2 Mbps (fixed, not
user-configurable) per port. Hence, if transit control traffic is taking too much bandwidth,
then it can cause drops on locally terminating control traffic, as shown in Figure 26 on
page 346.
Figure 26: Control Queue Rate Limiter Scenario
End-user A End-user B
Provider network
If the end users generate a mass of malicious traffic for which the port number is 179
(BGP), the router dispatches that traffic to the ingress control queue. Further, if congestion
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