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CCNP (Professional)
Passive Interface When Facing Different AS
dppagc
In CCNP Route lab manual, chapter 6-4
There are two border routers. Their interfaces face different EIGRP AS.
I realized that they cannot ping each other when only EIGRP is configured.
What is the purpose of configuring passive interfaces when they are already in different AS?
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Comments
networker050184
The passive interface get's the interface IPs into the routing table without forming a neighbor relationship on the link.
atorven
How would they form a neighbourship if they are in different AS?
networker050184
They won't necessarily automatically form a neighbor, but it's a safe guard. You don't want to be attempting to form a neighbor outside of your networks bounds. You open yourself up to misconfigurations and malicious activity.
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