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Scenario 6-3: IP Addressing and Subnet Derivation 431
VC between Mayberry and
Raleigh
255.255.255.0
VC between Mount Pilot and
Raleigh
255.255.255.0
Example 6-24
Scenario 6-3, show Commands on Router Mayberry
Mayberry#show ip route
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
Gateway of last resort is not set
170.1.0.0/24 is subnetted, 4 subnets
C 170.1.1.0 is directly connected, Serial0
I 170.1.103.0 [100/8539] via 170.1.1.3, 00:00:50, Serial0
I 170.1.102.0 [100/8539] via 170.1.1.2, 00:00:32, Serial0
C 170.1.101.0 is directly connected, Ethernet0
Mayberry#show ip interface brief
Interface IP-Address OK? Method Status Protocol
Serial0 170.1.1.1 YES NVRAM up up
Serial1 10.1.6.251 YES NVRAM administratively down down
Ethernet0 170.1.101.1 YES NVRAM up up
Mayberry#debug ip igrp transaction
IGRP protocol debugging is on
Mayberry#debug ip igrp events
IGRP event debugging is on
Mayberry#
IGRP: received update from 170.1.1.3 on Serial0
subnet 170.1.1.0, metric 10476 (neighbor 8476)
subnet 170.1.103.0, metric 8539 (neighbor 688)
subnet 170.1.102.0, metric 10539 (neighbor 8539)
subnet 170.1.101.0, metric 10539 (neighbor 8539)
IGRP: Update contains 4 interior, 0 system, and 0 exterior routes.
IGRP: Total routes in update: 4
IGRP: received update from 170.1.1.2 on Serial0
subnet 170.1.1.0, metric 10476 (neighbor 8476)
subnet 170.1.103.0, metric 10539 (neighbor 8539)
subnet 170.1.102.0, metric 8539 (neighbor 688)
subnet 170.1.101.0, metric 10539 (neighbor 8539)
IGRP: Update contains 4 interior, 0 system, and 0 exterior routes.
IGRP: Total routes in update: 4
Table 6-32
Subnets and Broadcast Addresses (Continued)
Location of Subnet
Geographically
Subnet Mask
Subnet Number
Subnet Broadcast
continues
ch06.fm Page 431 Monday, March 20, 2000 5:11 PM