Cisco 10000-2P2-2DC Software Guide - Page 319
Cisco 10000 Series Router Software Configuration Guide, OL-2226-23,
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Chapter 13 Unicast Reverse Path Forwarding Monitoring and Maintaining uRPF OL-2226-23 0 security failures, 0 bad options, 0 with options Opts: 0 end, 0 nop, 0 basic security, 0 loose source route 0 timestamp, 0 extended security, 0 record route 0 stream ID, 0 strict source route, 0 alert, 0 cipso, 0 ump 0 other Frags: 0 reassembled, 0 timeouts, 0 couldn't reassemble 0 fragmented, 0 couldn't fragment Bcast: 331512 received, 0 sent Mcast: 0 received, 0 sent Sent: 15 generated, 0 forwarded Drop: 0 encapsulation failed, 0 unresolved, 0 no adjacency 0 no route, 5 unicast RPF, 0 forced drop, 0 unsupported-addr 0 options denied, 0 source IP address zero A nonzero value for the count of dropped or suppressed packets can mean one of two things: • Packets have a bad source address (normal operation). • Router is misconfigured to use Unicast RPF in environments where asymmetric routing exists; that is, where multiple paths can exist as the best return path for a source address. Note The RPF counter increases when the source address resolves to a NULL 0 because the address is then considered as spoof. Example 13-2 shows the total of dropped or suppressed packets at a specific interface using the show ip interface command. Example 13-2 show ip interface Command Router> show ip interface gigabitEthernet 8/1/0 GigabitEthernet8/1/0 is up, line protocol is up Internet address is 80.1.1.1/24 Broadcast address is 255.255.255.255 Address determined by non-volatile memory MTU is 1500 bytes Helper address is not set Directed broadcast forwarding is disabled Outgoing access list is not set Inbound access list is not set Proxy ARP is enabled Local Proxy ARP is disabled Security level is default Split horizon is enabled ICMP redirects are always sent ICMP unreachables are always sent ICMP mask replies are never sent IP fast switching is enabled IP Flow switching is disabled IP CEF switching is enabled IP CEF switching turbo vector IP CEF turbo switching turbo vector Associated unicast routing topologies: Topology "base", operation state is UP IP multicast fast switching is enabled IP multicast distributed fast switching is disabled IP route-cache flags are Fast, CEF Router Discovery is disabled IP output packet accounting is disabled IP access violation accounting is disabled TCP/IP header compression is disabled Cisco 10000 Series Router Software Configuration Guide 13-15
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