15.7
Date Code 20171006 Instruction Manual SEL-400 Series Relays
Communications Interfaces
Ethernet Communications
The relay IPADDR setting uses Classless Inter-Domain Routing (CIDR) notation
and a variable-length subnet mask (VLSM) to define its local network and host address.
An IP address consists of two parts: a prefix that identifies the network followed
by a host address within that network. Early network devices used a subnet mask
to define the network prefix of an associated host address. Within the mask, sub-
net boundaries were defined by the 8-bit segments of the 32-bit IP address. These
boundaries constrained network prefixes to 8, 16, or 24 bits, defining Class A, B,
and C networks, respectively.
This classful networking often created subnetworks that were not sized effi-
ciently for actual requirements. CIDR allows more effective usage of a given
range of IP addresses. In CIDR notation, you enter the IPADDR setting in the
form a.b.c.d/p, where a.b.c.d is the host address in standard dotted decimal form
and p is the network prefix expressed as the number of “1” bits in the mask. For
example, if IPADDR := 192.168.1.2/24, the host address is 192.168.1.2 and the
network prefix is the first 24 bits of the address, or 192.168.1. The network
address is derived by applying the network prefix to IPADDR and filling the
remaining bits with zeros (in our example, it is 192.168.1.0). The broadcast
address is derived similarly, but the remaining bits are filled with ones
(192.168.1.255 for the example above). Neither the network (base) address nor the
broadcast address can be used for any host or router addresses on the network.
Table 15.4 Ethernet Card Network Configuration Settings
Label Description Range Default
EPORT Enable Ethernet port communication Y, N N
IPADDR IP network address/CIDR network prefix IP address w.x.y.z/t
where:
w = 0–126, 128–223
x = 0–255
y = 0–255
z = 0–255
t = 1–30
192.168.1.2/24
DEFRTR Default router w = 0–126, 128–223
x = 0–255
y = 0–255
z = 0–255
192.168.1.1
ETCPKA Enable TCP keep-alive functionality in all TCP communication sup-
ported by the relay
Y, N Y
KAIDLE Length of time to wait with no detected activity before sending a keep
alive packet
1–20 s 10
KAINTV Length of time to wait between sending keep-alive packets after receiv-
ing no response for the prior keep-alive packet
1–20 s (must be less than or
equal to KAIDLE)
1
KACNT Maximum number of keep-alive packets to send 1–20 6
NETMODE Network operating mode FIXED, FAILOVER,
SWITCHED, PRP, ISOLATEIP
FAILOVER
NETPORT Primary network port A, B, C, D C
FTIME Failover time out 0–65535 ms 1
NETASPD Network speed or autodetect on Port A AUTO, 10 Mbps, 100 Mbps AUTO
NETBSPD Network speed or autodetect on Port B AUTO, 10 Mbps, 100 Mbps AUTO
NETCSPD Network speed or autodetect on Port C AUTO, 10 Mbps, 100 Mbps AUTO
NETDSPD Network speed or autodetect on Port D AUTO, 10 Mbps, 100 Mbps AUTO
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