70 MN.00273.E - 004
Fig.24 - Header compression
LAG - Link Aggregation (IEEE 802.3ad)
Link Aggregation (LAG) is a feature available on SIAE switch that allows assigning up to 4 physical links
to one logical link (trunk) that functions as a single, higher-speed Ethernet link.
SIAE switch support IEEE802.3ad LAPC (Link Aggregation Control Protocol). LACP allows a network device
to negotiate an automatic bundling of links by sending LACP packets to the peer (directly connected device
that also implements LACP). In addition to the increased capacity and/or protection line of the logical link
and/or protection line, LACP provides additional advantages:
• Failover detection when a link fails, allowing for a trunk reconfiguration in order to avoid systematic
packet loss (after the reconfiguration the packets will be lost only if the throughput exceed the trunk
capacity)
Header
field size
(Bytes)
Header field
size after
internal coding
(Bytes)
Ethernet
C-TAG (802.1Q)
Q-in-Q (802.1ad)
(default=1)
MPLS
Max number of MPLS labels (from 1 to 3), PW included
(default=1)
Control Word (RFC4385)
IP+
UDP
RTP
Tunneling OPv4 - IPv4/IPv6(IPv4+UDP+GTP-U+IPv4/IPv6+UDP+RTP)
IPv4 only (default)
IPv4 or IPv6
Max number of S-TAG (from 1 to 2)
+14 +12.5
+4 +2
--
+(4*n) +(2*n)
--
+(4*n) +(4*n)
+4 +3.5
--
+20 +19.5
+40 +39.5
+8 +8
+12 +12
+100 +99
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