Monthly Archives: January 2017


uRPF does have additional features. The first one is uRPF exemptions and violation logging. With this feature, you may specify a standard or extended access-list as follows:

ip verify unicast source reachable-via [rx|any] <ACL-NUM>

The uRPF feature consults this access-list for packets violating the uRPF condition. If the ACL permits a packet, it is allowed to pass through. If the ACL denies the packet, the router drops it. You may use the log keyword to log the packets allowed or denied by the uRPF access-list.