An engineer configured Reverse Path Forwarding on an interface and noticed that the routes are dropped when a route lookup fails on that interface for a prefix that is available in the routing table. Which interface configuration resolves the issue?
A.
ip verify unicast source reachable-via l2-src
B.
ip verify unicast source reachable-via allow-default
Ref: Security - Configuring Network Security [Support] - Cisco Systems
“…
Configuring the Unicast RPF Check Mode
There are two Unicast RPF check modes:
• Strict check mode, which verifies that the source IP address exists in the FIB table and verifies that the source IP address is reachable through the input port.
• Exist-only check mode, which only verifies that the source IP address exists in the FIB table.
…
When configuring the Unicast RPF check mode, note the following information:
• Use the rx keyword to enable strict check mode.
• Use the any keyword to enable exist-only check mode.
• Use the allow-default keyword to allow use of the default route for RPF verification.
…”
The route lookup failed, but the prefix is in the routing table. RPF Exist-only check mode is the way to go.
A. ip verify unicast source reachable-via l2-src
Wrong answer.
B. ip verify unicast source reachable-via allow-default
Wrong answer.
C. ip verify unicast source reachable-via any
Correct answer.
D. ip verify unicast source reachable-via rx
Wrong answer.
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