EIGRP Passive Interface
EIGRP Passive Interface
In routing protocols like RIP, OSPF and EIGRP we have a command “passive-interface” which restrict or disable updates being sent from a specific interface.
The working of this command does differ little when used on different protocols.
Using the passive-interface advertisements of routing information is controlled. With the use of this command updates on some interfaces is suppressed but other interfaces do receive the EIGRP updates.
Mostly the passive-interface command is used to stop outgoing advertisement but EIGPR has some difference in working as not only outgoing advertisements are stopped but also stop incoming updates.
The command used to disable routing updates being sent on specific interface is:
passive-interface <interface>
The command used to disable routing updates being sent on all interfaces is:
passive-interface default
To enable an interface and allow EIGRP updates to be advertised on that port, you can use the
No passive-interface <interface>
As per the above topology to disable updates on fa0/0 we use the below config, thus fa0/0 does not send or receive EIGRP updates.
Router_A#conf t
Enter configuration commands, one per line. End with CNTL/Z.
Router_A(config)#router eigrp 10
Router_A(config-router)#network 10.0.0.0
Router_A(config-router)#network 20.0.0.0
Router_A(config-router)#passive-interface fa0/0
Router_A(config-router)#^Z
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