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Supported Modules and Encapsulations
Copyright © 2010, Juniper Networks, Inc.
Each port on the I/O module or IOA displayed in Figure 18 on page 158 has two queues.
These queues are further down the egress path than the queues found on the line module
and populated by the FC.
The low-priority queue is dedicated to packets that are received from the line module
queues that are dedicated to the physical ports. This queue blocks when full and provides
backpressure to the line module. This queue services unicast and multicast traffic that
is not using the hardware multicast packet replication feature.
The high-priority queue is dedicated to packets that are received from the line module
queue for port 8. This queue is serviced at a higher priority than the first queue, and drops
packets when full.
For more information about high-density Ethernet, see Configuring Ethernet Interfaces in
JunosE Physical Layer Configuration Guide.
You can enable optimized multicast packet replication on port 8 of the following
high-density Ethernet modules:
GE-8 I/O module (pairs with the GE-HDE line module)
ES2-S1 GE-8 IOA (pairs with the ES2 4G LM and the ES2 10G LM)
When enabled, the optimized multicast packet replication feature defines the
encapsulation of the egress multicast packet. The following encapsulations are supported:
IPv6 over Gigabit Ethernet
IPv6 over VLAN
IPv6 over S-VLAN
NOTE: 802.3ad link aggregation group (LAG) bundles do not support
optimized multicast packet replication.
The optimized multicast packet replication feature also provides an interface over which
you can configure the following:
IP MTU
Ethernet MTU
Egress IP policy
Egress VLAN policy
QoS
Chapter 5: Configuring IPv6 Multicast
159
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