They basically do the same but ip verify unicast reverse-path is going to be 
deprecated and IOS will start using only erify unicast source reachable-via 
where you can put any or rx or even an acl. 

Mike 

> Date: Tue, 24 Apr 2012 01:57:54 +0100
> From: stalker_t...@hotmail.com
> To: ccie_security@onlinestudylist.com
> Subject: [OSL | CCIE_Security] Unicast reverse path forwarding
> 
> Hi All,
> 
> What is the difference between "ip verify unicast reverse-path" and "ip 
> verify unicast source reachable-via rx"? I know the reverse-path command 
> is the legacy one, but when working with the INE workbooks sometimes 1 
> is used and sometimes its the other but why? is their a difference? 
> should one be used over the other in different scenarios?
> 
> Cheers
> 
> Tony
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