advertise about the connected subnet, but not to send RIP/IGRP updates on the interface. In
Example 6-2, a sample IGRP configuration causes the router to advertise about all connected
subnets, to listen on all interfaces for IGRP updates, and to advertise on all interfaces except
ethernet 1.
Figure 6-9). The passive-interface router subcommand causes the router to not send IGRP
updates on interface E1. Also, notice the 1 on the router igrp command--all other routers using
IGRP must use this same process-id, assuming that all routers want to exchange routing
information using IGRP.
ip address 10.1.2.3 255.255.255.0
interface ethernet 1
ip address 172.16.1.1 255.255.255.0
interface tokenring 0
ip address 10.1.3.3 255.255.255.0
interface serial 0
ip address 199.1.1.1 255.255.255.0
interface serial 1
ip address 199.1.2.1 255.255.255.0
!
router igrp 1
network 10.0.0.0
network 199.1.1.0
network 199.1.2.0
network 172.16.0.0
passive-interface ethernet 1
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, TokenRing0
C 10.1.3.0 is directly connected, Ethernet0
I 10.1.4.0 [100/8539] via 10.1.2.14, 00:00:50, Ethernet0
172.16.0.0/24 is subnetted, 2 subnets
C 172.16.1.0 is directly connected, Ethernet1
I 172.16.2.0 [100/6244] via 172.16.1.44, 00:00:20, Ethernet1
C 199.1.1.0/24 is directly connected, Serial0
C 199.1.2.0/24 is directly connected, Serial1