Sanity checks
VALIDATE-UPDATE-SOURCE
To have the Cisco IOS software validate the source IP address of incoming routing updates for Routing Information Protocol (RIP) and Interior Gateway Routing Protocol (IGRP) routing protocols, use the validate-update-source command in router configuration mode. To disable this function, use the no form of this command.
R1
|
R2
|
|---|---|
| router rip version 2 no validate-update-source network 172.1.0.0 network 192.168.1.0 network 192.168.2.0 no auto-summary |
router rip version 2 no validate-update-source network 10.0.0.0 network 192.168.3.0 network 192.168.4.0 no auto-summary |
Files:
GNS 3 Topology
R1.cfg
R2.cfg
NOTE: You need to add a static route in both routers pointing to each Fa0/0 IP for connectivity
Files:
GNS 3 Topology
NOTE: "enable IP processing on a serial interface"
R1(config)#int fastEthernet 0/0
R1(config-if)#ip unnumbered loopback 10
Point-to-point (non-multi-access) interfaces only
R2.cfg
NOTE: You need to add a static route in both routers pointing to each Fa0/0 IP for connectivity
IP UNNUMBERED
The ip unnumbered configuration command allows you to enable IP processing on a serial interface without assigning it an explicit IP address. The ip unnumbered interface can "borrow" the IP address of another interface already configured on the router, which conserves network and address space.
R1
|
R2
|
|---|---|
| interface Serial0/0 ip unnumbered Loopback10 clock rate 2000000 end interface Loopback10 ip address 172.1.1.1 255.255.0.0 end | interface Serial0/0 ip unnumbered Loopback10 clock rate 2000000 end interface Loopback10 ip address 10.1.1.1 255.0.0.0 end |
Files:
GNS 3 Topology
NOTE: "enable IP processing on a serial interface"
R1(config)#int fastEthernet 0/0
R1(config-if)#ip unnumbered loopback 10
Point-to-point (non-multi-access) interfaces only
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