Transition Networks, Inc.
S4224 Web User Guide
33595 Rev. C
Page 649 of 669
IP Source Guard
IP Source Guard is a secure feature used to restrict IP traffic on DHCP snooping untrusted ports by filtering
traffic based on the DHCP Snooping Table or manually configured IP Source Bindings. It helps prevent IP
spoofing attacks when a host tries to spoof and use the IP address of another host.
J
Jumbo frames
The S4224 supports jumbo frames. This frame size is set to 10056 bytes or jumbo mode by default. The frame
size is configurable to any value from 1500-9600 bytes. The jumbo mode is applicable only for data plane traffic;
management and control plane traffic is still restricted to 1500 bytes.
L
LACP
LACP is an IEEE 802.3ad standard protocol. The
L
ink
A
ggregation
C
ontrol
P
rotocol allows bundling several
physical ports together to form a single logical port. LACP is used by neighboring devices to agree on adding
links to a Link Aggregation Group, and to maintain packet ordering within each LAG. LACP will form an
aggregation when 2 or more S4224 ports are connected to the same partner.
LCI
Location Configuration Information.
LER (Label Edge Routing)
A Label Edge Router makes a decision on which label to prefix to a packet and forwards. Also, the last router in
the path removes the label from the packet and forwards the packet based on the header.
Link
In IPv6, a communication facility or medium over which nodes can communicate at the link layer (i.e., the layer
immediately below IPv6). Examples are Ethernets (simple or bridged); PPP links; X.25, Frame Relay, or ATM
networks; and internet (or higher) layer "tunnels", such as tunnels over IPv4 or IPv6 itself.
Link-layer address
In IPv6, a link-layer identifier for an interface. Examples include IEEE 802 addresses for Ethernet links and
E.164 addresses for ISDN links.
Link-local Address
One of IPv6 addresses for local link usage. In IPv6, an address having link-only scope that can be used to reach
neighboring nodes attached to the same link. All interfaces have a link-local unicast address.
Link MTU
The IPv6 Maximum Transmission Unit - the maximum packet size in octets that can be conveyed over a link.
Link Trace
Link Trace messages are Multicast frames that a MEP transmits to track the path (hop-by-hop) to a destination
MEP. Each receiving MEP sends a Linktrace Reply (LTR) directly to the Originating MEP, and regenerates the
Linktrace Message: Each Linktrace Message (LTM) is a CFM PDU initiated by a MEP to trace a path to a target
MAC address, forwarded from MIP to MIP, up to the point at which the LTM reaches its target, a MEP, or can no
longer be forwarded. Each MP along the path to the target generates an LTR.
Each Linktrace Reply (LTR) is a unicast CFM PDU sent by an MP to a MEP, in response to receiving an LTM
from that MEP. Linktrace Replies (LTRs) are carried in unicast frames. Linktrace Messages (LTMs) use
addresses from the Linktrace Message Group Destination MAC Addresses table.
