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DES-7200 Configuration Guide Chapter 2 RIP
Configuration
2-32
Figure5 Topological diagram for RIP supernet route
Networking Requirements
Two devices are interconnected through Ethernet. SwitchA runs RIPv2, and
SwitchB only supports RIPv1 protocol and is unable to learn supernet routes.
Requirements:
Configure a supernet route of 80.0.0.0/6 on Switch A, with next hop pointing
to interface loopback 1 (192.168.1.0);
Redistribute the aforementioned static route to RIP;
Prohibit supernet route advertisement on Switch A.
Configuration Tips
Switch B only supports RIPv1 protocol. According to RFC 1058, such device is
able to receive update packets of higher-version RIP, but such fields as subnet
mask and next hop in the packets must be neglected. Therefore, the route of
80.0.0.0/6 received by Switch B will be treated as 80.0.0.0/8. To prevent Switch B
from learning the wrong route, Switch A must be configured to prohibit supernet
route advertisement.
Configuration Steps
# SwitchA:
! Configure Ethernet interface
DES-7200(config)#interface FastEthernet 0/1
DES-7200(config-if-FastEthernet 0/1)#no switchport
DES-7200(config-if-FastEthernet 0/1)#ip address 192.168.12.1 255.255.255.0
DES-7200(config-if-FastEthernet 0/1)#no ip rip send supernet-routes
//Prohibit supernet route advertisement
! Configure loopback interface
DES-7200(config)#interface loopback 1