subnet. The router also can receive packets from hosts in one subnet and can forward the
packets to the other subnet using the same interface.
subinterfaces are not used, then all router interfaces attached to this same Frame Relay cloud
should be configured with IP addresses in the same subnet. In other words, treat the Frame
Relay cloud as any other multiaccess medium (such as a LAN). However, Frame Relay
configuration without subinterfaces introduces some routing protocol issues when there is not
a full mesh of virtual circuits (VCs) between each pair of routers. Subinterfaces allow distance
vector routing protocols to work well because individual VCs can be considered as separate
interfaces. This allows the routing protocol to maintain its split-horizon feature to defeat routing
loops.
Hostname Yosemite
ip domain-lookup
ip name-server 10.1.1.100 10.1.2.100
interface ethernet 0
ip address 10.1.7.252 255.255.255.0 secondary
ip address 10.1.2.252 255.255.255.0
interface serial 0
ip address 10.1.128.252 255.255.255.0
interface serial 1
ip address 10.1.129.252 255.255.255.0
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, * - candidate default
U - per-user static route, o - ODR
C 10.1.2.0 is directly connected, Ethernet0
C 10.1.7.0 is directly connected, Ethernet0
C 10.1.129.0 is directly connected, Serial1
C 10.1.128.0 is directly connected, Serial0
Yosemite#