The local OSPF router is unable to establish adjacency with a peer. Which two things should the administrator do to troubleshoot the issue? (Choose two.)

The correct answer is C. Check whether both peers have an IP address within the same subnet. D. Check if IP protocol 89 is blocked. Verify that both routers' OSPF-enabled interfaces have IPs in the same subnet - adjacency only forms with peers on the same network segment. Make sure IP protocol 89 (OSPF) isn't being blocked by any firewall or ACL-OSPF uses IP 89, not a TCP or UDP port.

Troubleshoot Routing Issues

Question

Options

ACheck whether TCP port 179 is blocked.
BCheck if there is an active static route to the peer.
CCheck whether both peers have an IP address within the same subnet.
DCheck if IP protocol 89 is blocked.

How the community answered

(34 responses)

A
9% (3)
B
18% (6)
C
74% (25)

Explanation

Verify that both routers' OSPF-enabled interfaces have IPs in the same subnet - adjacency only forms with peers on the same network segment. Make sure IP protocol 89 (OSPF) isn't being blocked by any firewall or ACL-OSPF uses IP 89, not a TCP or UDP port.

Topics

#OSPF#adjacency#IP protocol 89#subnet mismatch

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