The following modules support high-density Ethernet:
GE-HDE line module and GE-8 I/O module combination
ES2 4G LM and ES2-S1 10GE IOA module combination
ES2 4G LM and ES2-S1 GE-8 IOA module combination
In the current release, you cannot configure port
parameters for high-density Ethernet. Instead, JUNOSe contains a packet
classifier that enables the module to intelligently drop certain packets when the module becomes oversubscribed. The packet
classifier inspects each incoming packet to determine whether to classify
it as control traffic. To enhance network stability, the packet classifier
prioritizes control traffic over non-control traffic (that is, data).
The packet classifier randomly drops non-control packets when the
interface is oversubscribed.
When the I/O module or IOA is oversubscribed, the
packet classifier prioritizes the following
types of control traffic:
PPP discovery or PPP session
Address Resolution Protocol (ARP)
802.3ad (link aggregation)
802.3 Spanning Tree Protocol (STP)
IPv4 and IPv6 DHCP server
IPv4 and IPv6 DHCP host
IPv6 Neighbor Discovery
IPv4 virtual router alert
IPv4 and IPv6 Internet Group Management Protocol (IGMP)
IPv4 packets with a type of service (ToS) precedence value
set to Internetwork Control (C0)
IPv6 packets with a traffic class precedence value set
to Internetwork Control (C0)
