Known Behavior
19
Release 10.3.1
Ethernet
The hashing algorithm that selects the LAG member link is associated with the
IP address of the subscriber client to support QoS. Consequently, a particular
flow is always hashed to the same link. When a member link is removed from
a LAG bundle, traffic rate is disrupted and traffic flow is reduced. When the link
goes down and then comes back up, the traffic flow is automatically
redistributed.
When counting bits per second on a Fast Ethernet or Gigabit Ethernet interface,
an E Series router includes 12 bytes for interpacket gap, 7 bytes for preamble,
and 1 byte for start frame delimiter, for a total of 20 bytes (160 bits) per packet
more than some non–E Series routers. This value therefore shows the total
bandwidth utilization on the interface, including both data and overhead.
To bridge unicast known-DA packets at line rate on both 2-Gbps ports of the
GE-2 line module or the GE-HDE module when paired with the GE-2 SFP I/O
module, the minimum packet size must be at least 144 bytes.
When installed in the ERX1440 router, the GE-2 module delivers full bandwidth
of 4 GB per line module (2 GB at the ingress and 2 GB at the egress) only when
installed in slot 2 or slot 4, and when the SRP-40G+ module is used in the
router. When installed in any other ERX1440 slot, the GE-2 module delivers a
maximum bandwidth of 2 GB per line module (1 GB maximum at the ingress
and 1 GB maximum at the egress). Therefore, of the maximum 24 possible
ports for the module in an ERX1440 chassis (that is, two ports in each of 12
slots), full bandwidth is delivered only on a maximum of four ports (those in
slots 2 and 4).
When installed in the ERX1440 router, the GE-HDE line module delivers full
bandwidth of 4 GB per line module (2 GB at the ingress and 2 GB at the egress)
only when installed in slot 2 or slot 4, and when the SRP-40G+ module is used
in the router. When installed in any other ERX1440 slot, the GE-HDE module
delivers a maximum bandwidth of 2 GB per line module (1 GB maximum at the
ingress and 1 GB maximum at the egress). Therefore, of the maximum 96
possible ports for the module in an ERX1440 chassis (that is, 8 ports in each of
12 slots), full bandwidth is delivered only on a maximum of 16 ports (those in
slots 2 and 4).
When the GE-2 line module or the GE-HDE line module is installed in either the
ERX1440 router or the ERX310 router and both ports are active, line rate
performance is achieved only with packets that are 174 bytes or larger. The
line module might not achieve line rate with packets that are smaller than
174 bytes.
Support for the 0x9200 S-VLAN Ethertype has been removed. You can no
longer specify the
9200
option with the
svlan ethertype
command.
When you upgrade to Release 7.1.0 or higher-numbered release, the software
automatically transfers existing configurations that use the 0x9200 Ethertype
to the 0x88a8 Ethertype.
The
show interface gigabitEtherne
t command output does not display the
following line of output for Gigabit Ethernet modules that do not support SFPs,
such as the GE Single Mode I/O module and GE I/O Multi Mode I/O modules:
