This blog was originally started to better help me understand the technologies in the CCIE R&S blueprint; after completing the R&S track I have decided to transition the blog into a technology blog.

CCIE #29033

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Saturday, October 23, 2010

Question 147

What is the difference between "ip verify unicast source reachable-via any" and "ip verify unicast source reachable-via rx"?
Posted by Packets Analyzed at 8:33 PM
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1 comments:

Packets Analyzed said...

ip verify unicast source reachable-via any - Reverse path forwarding – source ip address of the packet entering the interface must have a route in the routing table that currently exists. This route to the source packet can exit out any interface – This is called LOOSE RPF and solves issues caused by asynchronous routing.

ip verify unicast source reachable-via rx - Reverse path forwarding – source ip address of the packet entering the interface must have a route in the routing table that currently exists. This route to the source packet MUST exit out the same interface from which it was received – This is called STRICT RPF

October 24, 2010 at 8:59 AM

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