The Unicast RPF suppressed drop count tracks the number of packets that failed the Unicast RPF check but were forwarded because of the permit permission set up in the ACL.
However, I didn't configure any ACL in this simulation.
Why suppressed drop counter still increases?
Here are my lab configuration
interface FastEthernet0/0 ip address 192.168.1.1 255.255.255.0 ip verify unicast source reachable-via any duplex auto speed auto end
interface FastEthernet0/1 ip address 10.1.1.1 255.255.255.0 ip verify unicast source reachable-via any duplex auto speed auto end
Routing table on R1
Gateway of last resort is not set
220.127.116.11/32 is subnetted, 1 subnets C 18.104.22.168 is directly connected, Loopback1 172.16.0.0/24 is subnetted, 1 subnets S 172.16.1.0 [1/0] via 10.1.1.3 10.0.0.0/24 is subnetted, 1 subnets C 10.1.1.0 is directly connected, FastEthernet0/1 C 192.168.1.0/24 is directly connected, FastEthernet0/0
Before I ping 192.168.1.1 with source 172.16.1.2
R1#show ip int f0/0 | in veri IP verify source reachable-via ANY 0 verification drops 0 suppressed verification drops
After I ping 192.168.1.1 with source 172.16.1.2
R1#show ip int f0/0 | in veri IP verify source reachable-via ANY 0 verification drops 5 suppressed verification drops
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