In a Q-in-Q deployment, customer packets from downstream interfaces are
transported without any changes to source and destination MAC addresses. You
can disable MAC address learning at both the interface level and the VLAN level.
Disabling MAC address learning on an interface disables learning for all the
VLANs of which that interface is a member. When you disable MAC address
learning on a VLAN, MAC addresses that have already been learned are flushed.
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Layer 2 Link Layer Discovery Protocol (LLDP) and Link Layer Discovery
Protocol–Media Endpoint Discovery (LLDP-MED)
—This feature is supported
on SRX100, SRX210, SRX240, SRX650, and J Series devices.
Devices use LLDP and LLDP-MED to learn and distribute device information on
network links. The information allows the device to quickly identify a variety of
systems, resulting in a LAN that interoperates smoothly and efficiently.
LLDP-capable devices transmit information in Type Length Value (TLV) messages
to neighbor devices. Device information can include specifics, such as chassis
and port identification and system name and system capabilities. The TLVs
leverage this information from parameters that have already been configured in
the Juniper Networks JUNOS Software.
LLDP-MED goes one step further, exchanging IP-telephony messages between
the device and the IP telephone. These TLV messages provide detailed information
on PoE policy. The PoE Management TLVs let the device ports advertise the
power level and power priority needed. For example, the device can compare
the power needed by an IP telephone running on a PoE interface with available
resources. If the device cannot meet the resources required by the IP telephone,
the device could negotiate with the telephone until a compromise on power is
reached.
LLDP and LLDP-MED must be explicitly configured on uPIMs (in enhanced
switching mode) on J Series devices, base ports on SRX100, SRX210, and SRX240
devices, and Gigabit-Backplane Physical Interface Modules (GPIMs) on SRX650
devices. To configure LLDP on all interfaces or on a specific interface, use the
lldp
statement at the [
set protocols
] hierarchy. To configure LLDP-MED on all
interfaces or on a specific interface, use the
lldp-med
statement at the [
set
protocols
] hierarchy.
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Promiscuous mode
—This feature is supported on SRX3400, SRX3600, SRX5600,
and SRX5800 devices.
When promiscuous mode is enabled on a Layer 3 Ethernet interface, all packets
received on the interface are sent to the CP/SPU regardless of the destination
MAC address of the packet. You can also enable promiscuous mode on chassis
cluster redundant Ethernet interfaces and aggregated Ethernet interfaces. If you
enable promiscuous mode on a redundant Ethernet interface, promiscuous mode
is then enabled on any child physical interfaces. If you enable promiscuous mode
on an aggregated Ethernet interface, promiscuous mode is then enabled on all
member interfaces.
To enable promiscuous mode on an interface, use the
promiscuous-mode
statement at the [
edit interfaces
] hierarchy.
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New Features in JUNOS Release 10.1 for SRX Series Services Gateways and J Series Services Routers
JUNOS 10.1 Software Release Notes
