Ethernet References - Juniper JUNOSE 11.2.X PHYSICAL LAYER Configuration Manual

JunosE 11.2.x Physical Layer Configuration Guide

Ethernet References

186
With a 320 Gbps fabric configuration, the E320 router can accommodate up to 12
combinations of ES2 10G ADV LMs and ES2-S2 10GE PR IOAs. You can install a
combination in any of the line module slots, each of which is allocated 10 Gbps of overall
bandwidth.
Access Operation
The ES2 10G ADV LM and ES2-S2 10GE PR IOA combination provides traditional
broadband access services such as PPPoE and subscriber interfaces. It also supports
both sides of the L2TP LNS and LAC function.
The combination can receive and transmit full duplex line rate of 10 GB (10 GB at the
ingress and 10 GB at the egress). The IOA can also support 9600-byte jumbo packets
at both the ingress and egress.
NOTE: The size of jumbo packets refers to the maximum allowable size in bytes of the
MRU for the jumbo Ethernet frames and not the maximum allowable size in bytes of
the MTU (frames transmitted from the egress interface).
Multicast
The ES2 10G ADV LM can receive multicast traffic, including all multicast control protocols.
The ES2 10G ADV LM can also transmit multicast control protocol frames and multicast
data frames to perform multicast egress elaboration.
Flow Control and Policy
The ES2 10G ADV LM and ES2-S2 10GE PR IOA combination supports QoS functionality
that is available on other ASIC-based Ethernet modules.
Currently, flow control using MAC pause frames is disabled on the ES2-S2 10GE PR IOA.
The IOA does not transmit or receive pause frames. Instead, the system prioritizes control
traffic over non-control traffic (that is, data). For a list of types of control traffic, see
"High-Density Ethernet" on page 187 .
For information about configuring policies on the ES2 10G ADV LM and ES2-S2 10GE PR
IOA, see JunosE Policy Management Configuration Guide.
For more information about Ethernet implementations, consult the following resources:
IEEE 802.1q (Virtual LANs)
IEEE 802.1w (Rapid Reconfiguration of Spanning Tree)
IEEE 802.3 (Fast Ethernet and Gigabit Ethernet)
IEEE 802.3u (Fast Ethernet only)
IEEE 802.3z (Gigabit Ethernet only)
IEEE 802.3ae (10-Gigabit Ethernet only)
Copyright © 2010, Juniper Networks, Inc.