Adj-5-resolve-req-fail Adj Resolve Request Failed For Review

Before diving into the error, it is crucial to understand what "ADJ" refers to. In Cisco's architecture, the is part of Cisco Express Forwarding (CEF). While traditional routing tables determine the path (next-hop IP), CEF adjacencies resolve the rewrite information needed to forward a packet out of a specific interface (Layer 2 MAC address, VLAN tags, etc.).

Run show ip arp <next-hop-ip> or show ipv6 neighbors <next-hop-ip> .

In this article, we will dissect the ADJ (Adjacency) resolution mechanism, explore the common and obscure triggers for the resolve-req-fail error, and provide a systematic approach to diagnosing and fixing the problem. adj-5-resolve-req-fail adj resolve request failed for

show ip interface brief | include <interface> Ensure the output interface is up/up . Also verify no input errors or CRC errors that could corrupt ARP.

The message often appears alongside %CEF-3-PUNT , %FIB-3-FIB_DISCARD , or hardware drop counters. The specific IP address mentioned is the next-hop that the router cannot resolve. Before diving into the error, it is crucial

The error often coincides with "incomplete" status for IP addresses in the show arp output.

Once you've diagnosed the likely cause, apply these targeted fixes. Run show ip arp <next-hop-ip> or show ipv6

show adjacency <interface> <next-hop-ip> detail A healthy adjacency shows "resolved" or "complete". A failing one may show "incomplete", "glean", or "drop".